Welcome to the Lago project documentation!

Lago Introduction

Lago is an add-hoc virtual framework which helps you build virtualized environments on your server or laptop for various use cases.

It currently utilizes ‘libvirt’ for creating VMs, but we are working on adding more providers such as ‘containers’.

Getting started

Installing Lago

You’ll notice that some of the actions you need to do to run Lago are currently manual, but we are working to add them as part of the standard Python packaging for Lago which is in progress.

Setting up yum repos

Currently only RPM installation is available but we are working on adding support for Ubuntu and Debian soon.

Add the following repos to a lago.repo file in your /etc/yum.repos.d/ dir:

For Fedora:

[lago]
baseurl=http://resources.ovirt.org/repos/lago/stable/0.0/rpm/fc$releasever
name=Lago
enabled=1
gpgcheck=0

For EL distros (such as CentOS, RHEL, etc.), make sure you have epel-release and centos-release-qemu-ev repositories installed and enabled, and:

[lago]
baseurl=http://resources.ovirt.org/repos/lago/stable/0.0/rpm/el$releasever
name=Lago
enabled=1
gpgcheck=0

Installing the packages

Once you have them, install the following packages:

$ yum install python-lago lago

This will install all the needed packages to get you up and running with Lago.

Configuring Libvirt

Make sure libvirt is configured to run:

$ systemctl enable libvirtd
$ systemctl start libvirtd

User permissions setup

Running lago requires certain permissions, so the user running it should be part of certain groups.

Add yourself to lago and qemu groups:

$ usermod -a -G lago USERNAME
$ usermod -a -G qemu USERNAME

It is also advised to add qemu user to your group (to be able to store VM files in home directory):

$ usermod -a -G USERNAME qemu

For the group changes to take place, you’ll need to re-login to the shell. Make sure running id returns all the aforementioned groups.

Make sure that the qemu user has execution rights to the dir where you will be creating the prefixes, you can try it out with:

$ sudo -u qemu ls /path/to/the/destination/dir

If it can’t access it, make sure that all the dirs in the path have your user or qemu groups and execution rights for the group, or execution rights for other (highly recommended to use the group instead, if the dir did not have execution rights for others already)

It’s very common for the user home directory to not have group execution rights, to make sure you can just run:

$ chmod g+x $HOME

And, just to be sure, let’s refresh libvirtd service to ensure that it refreshes it’s permissions and picks up any newly created users:

$ sudo service libvirtd restart

LagoInitFile

Each environment in Lago is created from an init file, the recommended format is YAML, although at the moment of writing JSON is still supported. By default, Lago will look for a file named LagoInitFile in the directory it was triggered. However you can pick a different file by running:

$ lago init <FILENAME>

Also note that you can create different prefixes in the same environment, by using the --prefix-name option:

$ lago --prefix-name env1 init LagoInitFile-el73
$ lago --prefix-name env2 init LagoInitFile-fc24

To change the default environment run:

$ lago set-current ENV_NAME

LagoInitFile example

domains:
  vm-el73:
    memory: 2048
    service_provider: systemd
    nics:
      - net: lago
    disks:
      - template_name: el7.3-base
         type: template
         name: root
         dev: vda
         format: qcow2
    artifacts:
      - /var/log
nets:
  lago:
    type: nat
    dhcp:
      start: 100
      end: 254
    management: true
    dns_domain_name: lago.local

LagoInitFile Syntax

Disclaimer: Work in progress

domains section

• vcpu: Number of virtual CPUs.

• cpu_model: <model>: This defines an exact match of a CPU model. The generated Libvirt <cpu> XML will be:

  <cpu>
      <model>Westmere</model>
      <topology cores="1" sockets="3" threads="1"/>
      <feature name="vmx" policy="require"/>
  </cpu>
  

  If the vendor of the host CPU and the selected model match, it will attempt to require vmx on Intel CPUs and svm on AMD CPUs, assuming the host CPU has that feature. The topology node will be generated with sockets equals to vcpu parameter, by default it is set to 2.

• cpu_custom: This allows to override entirely the CPU definition, by writing the domain CPU XML in YAML syntax, for example, for the following LagoInitFile:

  domains:
    vm-el73:
      vcpu: 2
      cpu_custom:
        '@mode': custom
        '@match': exact
        model:
          '@fallback': allow
          '#text': Westmere
        feature:
          '@policy': optional
          '@name': 'vmx'
        numa:
          cell:
            -
              '@id': 0
              '@cpus': 0
              '@memory': 2048
              '@unit': 'MiB'
            -
              '@id': 1
              '@cpus': 1
              '@memory': 2048
              '@unit': 'MiB'
    ...
  

  This will be the generated <cpu> XML:

  <cpu mode="custom" match="exact">
      <model fallback="allow">Westmere</model>
      <feature policy="optional" name="vmx"/>
      <numa>
          <cell id="0" cpus="0" memory="2048" unit="MiB"/>
          <cell id="1" cpus="1" memory="2048" unit="MiB"/>
      </numa>
      <topology cores="1" sockets="2" threads="1"/>
  </cpu>
  <vcpu>2</vcpu>
  

  The conversion is pretty straight-forward, @ maps to attribute, and #text to text fields. If topology section is not defined, it will be added.

• No cpu_custom or cpu_model: Then Libvirt’s host-passthrough will be used. For more information see: Libvirt CPU model

Getting started with some Lago Examples!

Get Lago up & running in no time using one of the available examples

Important: make sure you followed the installation step before to have Lago installed.

Available Examples

• Simple Jenkins server + slaves: Jenkins_Example
• Advanced oVirt example (using nested virtualization): oVirt_Example

Configuration

The recommend method to override the configuration file is by letting lago auto-generate them:

$ mkdir -p $HOME/.config/lago
$ lago generate-config > $HOME/.config/lago/lago.conf

This will dump the current configuration to $HOME/.config/lago/lago.conf, and you may edit it to change any parameters. Take into account you should probably comment out parameters you don’t want to change when editing the file. Also, all parameters in the configuration files can be overridden by passing command line arguments or with environment variables, as described below.

lago.conf format

Lago runs without a configuration file by default, for reference-purposes, when lago is installed from the official packages(RPM or DEB), a commented-out version of lago.conf(INI format) is installed at /etc/lago/lago.conf.

In lago.conf global parameters are found under the [lago] section. All other sections usually map to subcommands(i.e. lago init command would be under [init] section).

Example:

$ lago generate-config
> [lago]
> # log level to use
> loglevel = info
> logdepth = 3
> ....
> [init]
> # location to store repos
> template_repos = /var/lib/lago/repos
> ...

lago.conf look-up

Lago attempts to look lago.conf in the following order:

1. /etc/lago/lago.conf
2. According to XDG standards , which are by default:
   • /etc/xdg/lago/lago.conf
   • /home/$USER/.config/lago/lago.conf
3. Any environment variables.
4. CLI passed arguments.

If more than one file exists, all files are merged, with the last occurrence of any parameter found used.

Overriding parameters with environment variables

To differentiate between the root section in the configuration file, lago uses the following format to look for environment variables:

'LAGO_GLOBAL_VAR' -> variable in [lago] section
'LAGO__SUBCOMMAND__PARAM_1' -> variable in [subcommand] section

Example: changing the template_store which init subcommand uses to store templates:

# check current value:
$ lago generate-config | grep -A4 "init"
> [init]
> # location to store repos
> template_repos = /var/lib/lago/repos
> # location to store temp
> template_store = /var/lib/lago/store

$ export LAGO__INIT__TEMPLATE_STORE=/var/tmp
$ lago generate-config | grep -A4 "init"
> [init]
> # location to store repos
> template_repos = /var/lib/lago/repos
> # location to store temp
> template_store = /var/tmp

Debugging Lago Environment

Now that you’ve run any of the examples, you probably eager to dive into

the Lago environment and checkout the created VMs and resources.

This document will give you a taste of how to do it, but if you’re interested<br> In a deeper view, please checkout the full Lago tutorial (TBD).

We’ll use the oVirt example for explaining how to debug the environment created.

Debugging the Lago environment created by oVirt system tests

As the above script has become a bit complicated, and it’s not (yet) part of Lago itself, this section will do the same as the script, but step by step with Lago only command to give you a better idea of what you have to do in a usual project.

So, let’s get back to the root of the ovirt-system-tests repo, and cd into the basic_suite_4.0 dir:

cd ovirt-system-tests/basic_suite_4.0

Let’s take a look to what is in there:

$ tree
.
├── control.sh
├── deploy-scripts
│   ├── add_local_repo.sh
│   ├── bz_1195882_libvirt_workaround.sh
│   ├── setup_container_host.sh
│   ├── setup_engine.sh
│   ├── setup_host.sh
│   ├── setup_storage_iscsi.sh
│   └── setup_storage_nfs.sh
├── engine-answer-file.conf
├── init.json.in
├── reposync-config.repo
├── template-repo.json
└── test-scenarios
    ├── 001_initialize_engine.py
    ├── 002_bootstrap.py
    ├── 003_create_clean_snapshot.py
    └── 004_basic_sanity.py

We can ignore the control.sh script, as it’s used by the run_suite.sh and we don’t care about that in this readme.

init.json.in: The heart of lago, virt configurations

This init.json.in file, is where we will describe all the virtual elements of our test environment, usually, vms and networks.

In this case, as the file is shared between suites, it’s actually a template and we will have to change the @SUITE@ string inside it by the path to the current suite:

$ suite_path=$PWD
$ sed -e "s/@SUITE@/$suite_path/g" init.json.in > init.json

Now we have a full init.json file :), but we have to talk about another file before being able to create the prefix:

Note that lago supports json and yaml formats for that file.

template-repo.json: Sources for templates

This file contains information about the available disk templates and repositories to get them from, we can use it as it is, but if you are in Red Hat office in Israel, you might want to use the Red Hat internal mirrors there, for that use the common/template-repos/office.json file instead, see next for the full command line.

NOTE: You can use any other template repo if you specify your own json file there

Initializing the prefix

Now we have seen all the files needed to initialize our test prefix (aka, the directory that will contain our env). To do so we have to run this:

$ lagocli init \
    --template-repo-path=template-repo.json \
    deployment-basic_suite_4.0 \
    init.json

Remember that if you are in the Red Hat office, you might want to use the repo mirror that’s hosted there, if so, run this command instead:

$ lagocli init \
    --template-repo-path=common/template-repos/office.json \
    deployment-basic_suite_4.0 \
    init.json

This will create the deployment-basic_suite_4.0 directory and populate it with all the disks defined in the init.json file, and some other info (network info, uuid... not relevant now).

This will take a while the first time, but the next time it will use locally cached images and will take only a few seconds!

If you are using run_suite.sh

To use an alternate repository template file when running run_suite.sh, you’ll have to edit it for now, search for the init command invocation and modify it there, at the time of writing this, if you want to use the Red Hat Israel office mirror, you have to change this:

38 env_init () {
39     $CLI init \
40         $PREFIX \
41         $SUITE/init.json \
42         --template-repo-path $SUITE/template-repo.json
43 }

by:

env_init () {
    $CLI init \
        $PREFIX \
        $SUITE/init.json \
        --template-repo-path common/template-repos/office.json
}

reposync-config.repo: yum repositories to make available to the vms

This file contains a valid yum repos definition, it’s the list of all the yum repos that will be enabled on the vms to pull from. If you want to use any custom repos just add the yum repo entry of your choice there and it will be make accessible to the vms.

The internal repository is built from one or several ‘sources’, there are 2 types of sources:

• External RPM repositories:

  A yum .repo file can be passed to the verb, and all the included repositories will be downloaded using ‘reposync’ and added to the internal repo.

This is used by the ovirt reposetup verb. To prefetch and generate the local repo, we have to run it:

$ lagocli ovirt reposetup --reposync-yum-config="reposync-config.repo"

This might take a while the first time too, as it has to fetch a few rpms from a few repos, next time it will also use a cache to speed things up considerably.

NOTE: From now on, all the lagocli command will be run inside the prefix, so cd to it:

$ cd deployment-basic_suite_4.0

Bring up the virtual resources

We are ready to start powering up vms!

# make sure you are in the prefix
$ pwd
/path/to/ovirt-system-tests/deployment-basic_suite_4.0
$ lagocli start

This starts all resources (VMs, bridges), at any time, you can use the stop verb to stop all active resources.

Run oVirt initial setup scripts

Once all of our vms and network are up and running, we have to run any setup scripts that will configure oVirt in the machines, as we already described in the init.json what scripts should be executed, the only thing left is to trigger it:

$ lagocli ovirt deploy

This should be relatively fast, around a minute or two, for everything to get installed and configured

Running the tests

Okok, so now we have our environment ready for the tests!! \o/

Lets get it on, remember that they should be executed in order:

$ lagocli ovirt runtest 001_initialize_engine.py
...
$ lagocli ovirt runtest 002_bootstrap.py
...
$ lagocli ovirt runtest 003_create_clean_snapshot.py
...
$ lagocli ovirt runtest 004_basic_sanity.py
...

This tests run a simple test suite on the environment:

• Create a new DC and cluster
• Deploy all the hosts
• Add storage domains
• Import templates

The tests are written in python and interact with the environment using the python SDK.

Collect the logs

So now we want to collect all the logs from the vms, to troubleshoot and debug if needed (or just to see if they show what we expect). To do so, you can just:

$ lagocli ovirt collect \
    --output "test_logs"

We can run that command anytime, you can run it in between the tests also, specifying different output directories if you want to see the logs during the process or compare later with the logs once the tests finish.

You can see all the logs now in the dir we specified:

$ tree test_logs
test_logs/
├── engine
│   └── _var_log_ovirt-engine
│       ├── boot.log
│       ├── console.log
│       ├── dump
│       ├── engine.log
│       ├── host-deploy
│       ├── notifier
│       ├── ovirt-image-uploader
│       ├── ovirt-iso-uploader
│       ├── server.log
│       └── setup
│           └── ovirt-engine-setup-20151029122052-7g9q2k.log
├── host0
│   └── _var_log_vdsm
│       ├── backup
│       ├── connectivity.log
│       ├── mom.log
│       ├── supervdsm.log
│       ├── upgrade.log
│       └── vdsm.log
├── host1
│   └── _var_log_vdsm
│       ├── backup
│       ├── connectivity.log
│       ├── mom.log
│       ├── supervdsm.log
│       ├── upgrade.log
│       └── vdsm.log
├── host2
│   └── _var_log_vdsm
│       ├── backup
│       ├── connectivity.log
│       ├── mom.log
│       ├── supervdsm.log
│       ├── upgrade.log
│       └── vdsm.log
├── host3
│   └── _var_log_vdsm
│       ├── backup
│       ├── connectivity.log
│       ├── mom.log
│       ├── supervdsm.log
│       ├── upgrade.log
│       └── vdsm.log
├── storage-iscsi
└── storage-nfs

Cleaning up

As before, once you have finished playing with the prefix, you will want to clean it up (remember to play around!), to do so just:

$ lagocli cleanup

FAQ

1. How do I know if the run_suite.sh is stuck or still running?

   Sometimes the script is downloading very big files which might Seem to someone as the script is stuck. One hacky way of making sure the script is still working is to check the size and content of the store dir:

   $ ls -la /var/lib/lago/store
   

   This will show any templates being downloaded and file size changes.

Developing

CI Process

Here is described the usual workflow of going through the CI process from starting a new branch to getting it merged and released in the unstable repo.

Starting a branch

First of all, when starting to work on a new feature or fix, you have to start a new branch (in your fork if you don’t have push rights to the main repo). Make sure that your branch is up to date with the project’s master:

git checkout -b my_fancy_feature
# in case that origin is already lago-project/lago
git reset --hard origin/master

Then, once you can just start working, doing commits to that branch, and pushing to the remote from time to time as a backup.

Once you are ready to run the ci tests, you can create a pull request to master branch, if you have hub installed you can do so from command line, if not use the ui:

$ hub pull-request

That will automatically trigger a test run on ci, you’ll see the status of the run in the pull request page. At that point, you can keep working on your branch, probably just rebasing on master regularly and maybe amending/squashing commits so they are logically meaningful.

A clean commit history

An example of not good pull request history:

• Added right_now parameter to virt.VM.start function
• Merged master into my_fancy_feature
• Added tests for the new parameter case
• Renamed right_now parameter to sudo_right_now
• Merged master into my_fancy_feature
• Adapted test to the rename

This history can be greatly improved if you squashed a few commits:

• Added sudo_right_now parameter to virt.VM.start function
• Added tests for the new parameter case
• Merged master into my_fancy_feature
• Merged master into my_fancy_feature

And even more if instead of merging master, you just rebased:

• Added sudo_right_now parameter to virt.VM.start function
• Added tests for the new parameter case

That looks like a meaningful history :)

Rerunning the tests

While working on your branch, you might want to rerun the tests at some point, to do so, you just have to add a new comment to the pull request with one of the following as content:

• ci test please
• ci :+1:
• ci :thumbsup:

Asking for reviews

If at any point, you see that you are not getting reviews, please add the label ‘needs review’ to flag that pull request as ready for review.

Getting the pull request merged

Once the pull request has been reviewed and passes all the tests, an admin can start the merge process by adding a comment with one of the following as content:

• ci merge please
• ci :shipit:

That will trigger the merge pipeline, that will run the tests on the merge commit and deploy the artifacts to the unstable repo on success.

Environment setup

Here are some guidelines on how to set up your development of the lago project.

Requirements

You’ll need some extra packages to get started with the code for lago, assuming you are runnig Fedora:

> sudo dnf install git mock libvirt-daemon qemu-kvm autotools

And you’ll need also a few Python libs, which you can install from the repos or use venv or similar, for the sake of this example we will use the repos ones:

> sudo dnf install python-flake8 python-nose python-dulwich yapf

Yapf is not available on older Fedoras or CentOS, you can get it from the official yapf repo or try on copr.

Now you are ready to get the code:

> git clone git@github.com:lago-project/lago.git

From now on all the commands will be based from the root of the cloned repo:

> cd lago

Style formatting

We will accept only patches that pass pep8 and that are formatted with yapf. More specifically, only patches that pass the local tests:

> make check-local

It’s recommended that you setup your editor to check automatically for pep8 issues. For the yapf formatting, if you don’t want to forget about it, you can install the pre-commit git hook that comes with the project code:

> ln -s scripts/pre-commit.style .git/pre-commit

Now each time that you run git commit it will automatically reformat the code you changed with yapf so you don’t have any issues when submitting a patch.

Testing your changes

Once you do some changes, you should make sure they pass the checks, there’s no need to run on each edition but before submitting a patch for review you should do it.

You can run them on your local machine, but the tests themselves will install packages and do some changes to the os, so it’s really recommmended that you use a vm, or as we do on the CI server, use mock chroots. If you don’t want to setup mock, skip the next section.

Hopefully in a close future we can use lago for that ;)

Setting up mock_runner.sh with mock (fedora)

For now we are using a script developed by the oVirt devels to generate chroots and run tests inside them, it’s not packaged yet, so we must get the code itself:

> cd ..
> git clone git://gerrit.ovirt.org/jenkins

As an alternative, you can just download the script and install them in your $PATH:

> wget https://gerrit.ovirt.org/gitweb?p=jenkins.git;a=blob_plain;f=mock_configs/mock_runner.sh;hb=refs/heads/master

We will need some extra packages:

> sudo dnf install mock

And, if not running as root (you shouldn’t!) you have to add your user to the newly created mock group, and make sure the current session is in that group:

> sudo usermod -a -G mock $USER
> newgrp mock
> id  # check that mock is listed

Running the tests inside mock

Now we have all the setup we needed, so we can go back to the lago repo and run the tests, the first time you run them, it will take a while to download all the required packages and install them in the chroot, but on consecutive runs it will reuse all the cached chroots.

The mock_runner.sh script allows us to test also different distributions, any that is supported by mock, for example, to run the tests for fedora 23 you can run:

> ../jenkins/mock_runner.sh -p fc23

That will run all the check-patch.sh (the -p option) tests inside a chroot, with a minimal fedora 23 installation. It will leave any logs under the logs directory and any generated artifacts under exported-artifacts.

Getting started developing

Everyone is welcome to send patches to lago, but we know that not everybody knows everything, so here’s a reference list of technologies and methodologies that lago uses for reference.

Python!

Lago is written in python 2.7 (for now), so you should get yourself used to basic-to-medium python constructs and technics like:

• Basic python: Built-in types, flow control, pythonisms (import this)
• Object oriented programming (OOP) in python: Magic methods, class inheritance

Some useful resources:

• Base docs: https://docs.python.org/2.7/

• Built-in types: https://docs.python.org/2.7/library/stdtypes.html

• About classes: https://docs.python.org/2.7/reference/datamodel.html#new-style-and-classic-classes

• The Zen of Python:

  > python -c "import this"
  
  The Zen of Python, by Tim Peters
  
  Beautiful is better than ugly.
  Explicit is better than implicit.
  Simple is better than complex.
  Complex is better than complicated.
  Flat is better than nested.
  Sparse is better than dense.
  Readability counts.
  Special cases aren't special enough to break the rules.
  Although practicality beats purity.
  Errors should never pass silently.
  Unless explicitly silenced.
  In the face of ambiguity, refuse the temptation to guess.
  There should be one-- and preferably only one --obvious way to do it.
  Although that way may not be obvious at first unless you're Dutch.
  Now is better than never.
  Although never is often better than *right* now.
  If the implementation is hard to explain, it's a bad idea.
  If the implementation is easy to explain, it may be a good idea.
  Namespaces are one honking great idea -- let's do more of those!
  

Bash

Even though there is not much bash code, the functional tests and some support scripts use it, so better to get some basics on it. We will try to follow the same standards for it than the oVirt project has.

Libvirt + qemu/kvm

As we are using intesively libvirt and qemu/kvm, it’s a good idea to get yourself familiar with the main commands and services:

• libvirt: http://libvirt.org
• virsh client: http://libvirt.org/virshcmdref.html
• qemu (qemu-img is useful to deal with vm disk images): https://en.wikibooks.org/wiki/QEMU/Images

Also, there’s a library and a set of tools from the libguestfs project that we use to prepare templates and are very useful when debugging, make sure you play at least with virt-builder, virt-customize, virt-sparsify and guestmount.

Git + Github

We use git as code version system, and we host it on Github right now, so if you are not familiar with any of those tools, you should get started with them, specially you should be able to:

• Clone a repo from github
• Fork a repo from github
• Create/delete/move to branches (git checkout)
• Move to different points in git history (git reset)
• Create/delete tags (git tag)
• See the history (git log)
• Create/amend commits (git commit)
• Retrieve changes from the upstream repository (git fetch)
• Apply your changes on top of the retrieved ones (git rebase)
• Apply your changes as a merge commit (git merge)
• Squash/reorder existing commits (git rebase –interactive)
• Send your changes to the upstream (git push)
• Create a pull request

You can always go to the git docs though there is a lot of good literature on it too.

Unit tests with py.test

Lately we decided to use py.test for the unit tests, and all the current unit tests were migrated to it. We encourage adding unit tests to any pull requests you send.

Functional tests with bats

For the functional tests, we decided to use bats framework. It’s completely written in bash, and if you are modifying or adding any functionality, you should add/modify those tests accordingly. It has a couple of custom constructs, so take a look to the bats docs while reading/writing tests.

Packaging

Our preferred distribution vector is though packages. Right now we are only building for rpm-based system, so right now you can just take a peek on how to build rpms. Keep in mind also that we try to move as much of the packaging logic as posible to the python packaging system itself too, worth getting used to it too.

Where to go next

You can continue setting up your environment and try running the examples in the readme to get used to lago. Once you get familiar with it, you can pick any of the existing issues and send a pull request to fix it, so you get used to the ci process we use to get stuff developed flawlessly and quickly, welcome!

Contents

lago package

Subpackages

lago.plugins package

exception lago.plugins.NoSuchPluginError

Bases: lago.plugins.PluginError

lago.plugins.PLUGIN_ENTRY_POINTS = {'vm': 'lago.plugins.vm', 'vm-service': 'lago.plugins.vm_service', 'vm-provider': 'lago.plugins.vm_provider', 'cli': 'lago.plugins.cli', 'out': 'lago.plugins.output'}

Map of plugin type string -> setuptools entry point

class lago.plugins.Plugin

Bases: object

Base class for all the plugins

exception lago.plugins.PluginError

Bases: exceptions.Exception

lago.plugins.load_plugins(namespace, instantiate=True)

Loads all the plugins for the given namespace

Parameters:

• namespace (str) – Namespace string, as in the setuptools entry_points
• instantiate (bool) – If true, will instantiate the plugins too

Returns:

Returns the list of loaded plugins

Return type:

dict of str, object

Submodules

lago.plugins.cli module

About CLIPlugins

A CLIPlugin is a subcommand of the lagocli command, it’s ment to group actions together in a logical sense, for example grouping all the actions done to templates.

To create a new subcommand for testenvcli you just have to subclass the CLIPlugin abstract class and declare it in the setuptools as an entry_point, see this module’s setup.py/setup.cfg for an example:

class NoopCLIplugin(CLIPlugin):
    init_args = {
        'help': 'dummy help string',
    }

    def populate_parser(self, parser):
        parser.addArgument('--dummy-flag', action='store_true')

    def do_run(self, args):
        if args.dummy_flag:
            print "Dummy flag passed to noop subcommand!"
        else:
            print "Dummy flag not passed to noop subcommand!"

You can also use decorators instead, an equivalent is:

@cli_plugin_add_argument('--dummy-flag', action='store_true')
@cli_plugin(help='dummy help string')
def my_fancy_plugin_func(dummy_flag, **kwargs):
    if dummy_flag:
        print "Dummy flag passed to noop subcommand!"
    else:
        print "Dummy flag not passed to noop subcommand!"

Or:

@cli_plugin_add_argument('--dummy-flag', action='store_true')
def my_fancy_plugin_func(dummy_flag, **kwargs):
    "dummy help string"
    if dummy_flag:
        print "Dummy flag passed to noop subcommand!"
    else:
        print "Dummy flag not passed to noop subcommand!"

Then you will need to add an entry_points section in your setup.py like:

setup(
    ...
    entry_points={
        'lago.plugins.cli': [
            'noop=noop_module:my_fancy_plugin_func',
        ],
    }
    ...
)

Or in your setup.cfg like:

[entry_points]
lago.plugins.cli =
    noop=noop_module:my_fancy_plugin_func

Any of those will add a new subcommand to the lagocli command that can be run as:

$ lagocli noop
Dummy flag not passed to noop subcommand!

TODO: Allow per-plugin namespacing to get rid of the **kwargs parameter

class lago.plugins.cli.CLIPlugin

Bases: lago.plugins.Plugin

_abc_cache = <_weakrefset.WeakSet object>

_abc_negative_cache = <_weakrefset.WeakSet object>

_abc_negative_cache_version = 29

_abc_registry = <_weakrefset.WeakSet object>

do_run(args)

Execute any actions given the arguments

Parameters:args (Namespace) – with the arguments Returns:None

init_args

Dictionary with the argument to initialize the cli parser (for example, the help argument)

populate_parser(parser)

Add any required arguments to the parser

Parameters:parser (ArgumentParser) – parser to add the arguments to Returns:None

class lago.plugins.cli.CLIPluginFuncWrapper(do_run=None, init_args=None)

Bases: lago.plugins.cli.CLIPlugin

Special class to handle decorated cli plugins, take into account that the decorated functions have some limitations on what arguments can they define actually, if you need something complicated, used the abstract class CLIPlugin instead.

Keep in mind that right now the decorated function must use **kwargs as param, as it will be passed all the members of the parser, not just whatever it defined

__call__(*args, **kwargs)

Keep the original function interface, so it can be used elsewhere

_abc_cache = <_weakrefset.WeakSet object>

_abc_negative_cache = <_weakrefset.WeakSet object>

_abc_negative_cache_version = 29

_abc_registry = <_weakrefset.WeakSet object>

add_argument(*argument_args, **argument_kwargs)

do_run(args)

init_args

populate_parser(parser)

set_help(help=None)

set_init_args(init_args)

lago.plugins.cli.cli_plugin(func=None, **kwargs)

Decorator that wraps the given function in a CLIPlugin

Parameters:

• func (callable) – function/class to decorate
• **kwargs – Any other arg to use when initializing the parser (like help, or prefix_chars)

Returns:

cli plugin that handles that method

Return type:

CLIPlugin

Notes

It can be used as a decorator or as a decorator generator, if used as a decorator generator don’t pass any parameters

Examples

>>> @cli_plugin
... def test(**kwargs):
...     print 'test'
...
>>> print test.__class__
<class 'cli.CLIPluginFuncWrapper'>

>>> @cli_plugin()
... def test(**kwargs):
...     print 'test'
>>> print test.__class__
<class 'cli.CLIPluginFuncWrapper'>

>>> @cli_plugin(help='dummy help')
... def test(**kwargs):
...     print 'test'
>>> print test.__class__
<class 'cli.CLIPluginFuncWrapper'>
>>> print test.init_args['help']
'dummy help'

lago.plugins.cli.cli_plugin_add_argument(*args, **kwargs)

Decorator generator that adds an argument to the cli plugin based on the decorated function

Parameters:

• *args – Any args to be passed to argparse.ArgumentParser.add_argument()
• *kwargs – Any keyword args to be passed to argparse.ArgumentParser.add_argument()

Returns:

Decorator that builds or extends the cliplugin for the

decorated function, adding the given argument definition

Return type:

function

Examples

>>> @cli_plugin_add_argument('-m', '--mogambo', action='store_true')
... def test(**kwargs):
...     print 'test'
...
>>> print test.__class__
<class 'cli.CLIPluginFuncWrapper'>
>>> print test._parser_args
[(('-m', '--mogambo'), {'action': 'store_true'})]

>>> @cli_plugin_add_argument('-m', '--mogambo', action='store_true')
... @cli_plugin_add_argument('-b', '--bogabmo', action='store_false')
... @cli_plugin
... def test(**kwargs):
...     print 'test'
...
>>> print test.__class__
<class 'cli.CLIPluginFuncWrapper'>
>>> print test._parser_args 
[(('-b', '--bogabmo'), {'action': 'store_false'}),
 (('-m', '--mogambo'), {'action': 'store_true'})]

lago.plugins.cli.cli_plugin_add_help(help)

Decorator generator that adds the cli help to the cli plugin based on the decorated function

Parameters:help (str) – help string for the cli plugin Returns:

Decorator that builds or extends the cliplugin for the

decorated function, setting the given help

Return type:function

Examples

>>> @cli_plugin_add_help('my help string')
... def test(**kwargs):
...     print 'test'
...
>>> print test.__class__
<class 'cli.CLIPluginFuncWrapper'>
>>> print test.help
my help string

>>> @cli_plugin_add_help('my help string')
... @cli_plugin()
... def test(**kwargs):
...     print 'test'
>>> print test.__class__
<class 'cli.CLIPluginFuncWrapper'>
>>> print test.help
my help string

lago.plugins.output module

About OutFormatPlugins

An OutFormatPlugin is used to format the output of the commands that extract information from the perfixes, like status.

class lago.plugins.output.DefaultOutFormatPlugin

Bases: lago.plugins.output.OutFormatPlugin

_abc_cache = <_weakrefset.WeakSet object>

_abc_negative_cache = <_weakrefset.WeakSet object>

_abc_negative_cache_version = 29

_abc_registry = <_weakrefset.WeakSet object>

format(info_obj, indent='')

indent_unit = ' '

class lago.plugins.output.FlatOutFormatPlugin

Bases: lago.plugins.output.OutFormatPlugin

_abc_cache = <_weakrefset.WeakSet object>

_abc_negative_cache = <_weakrefset.WeakSet object>

_abc_negative_cache_version = 29

_abc_registry = <_weakrefset.WeakSet object>

format(info_dict, delimiter='/')

This formatter will take a data structure that represent a tree and will print all the paths from the root to the leaves

in our case it will print each value and the keys that needed to get to it, for example:

vm0:

net: lago memory: 1024

will be output as:

vm0/net/lago vm0/memory/1024

Args:

info_dict (dict): information to reformat delimiter (str): a delimiter for the path components

Returns:

str: String representing the formatted info

class lago.plugins.output.JSONOutFormatPlugin

Bases: lago.plugins.output.OutFormatPlugin

_abc_cache = <_weakrefset.WeakSet object>

_abc_negative_cache = <_weakrefset.WeakSet object>

_abc_negative_cache_version = 29

_abc_registry = <_weakrefset.WeakSet object>

format(info_dict)

class lago.plugins.output.OutFormatPlugin

Bases: lago.plugins.Plugin

_abc_cache = <_weakrefset.WeakSet object>

_abc_negative_cache = <_weakrefset.WeakSet object>

_abc_negative_cache_version = 29

_abc_registry = <_weakrefset.WeakSet object>

format(info_dict)

Execute any actions given the arguments

Parameters:info_dict (dict) – information to reformat Returns:String representing the formatted info Return type:str

class lago.plugins.output.YAMLOutFormatPlugin

Bases: lago.plugins.output.OutFormatPlugin

_abc_cache = <_weakrefset.WeakSet object>

_abc_negative_cache = <_weakrefset.WeakSet object>

_abc_negative_cache_version = 29

_abc_registry = <_weakrefset.WeakSet object>

format(info_dict)

lago.plugins.service module

Service Plugin

This plugins are used in order to manage services in the vms

class lago.plugins.service.ServicePlugin(vm, name)

Bases: lago.plugins.Plugin

BIN_PATH

Path to the binary used to manage services in the vm, will be checked for existence when trying to decide if the serviece is supported on the VM (see func:is_supported).

Returns:Full path to the binary insithe the domain Return type:str

_abc_cache = <_weakrefset.WeakSet object>

_abc_negative_cache = <_weakrefset.WeakSet object>

_abc_negative_cache_version = 29

_abc_registry = <_weakrefset.WeakSet object>

_request_start()

Low level implementation of the service start request, used by the func:start method

Returns:True if the service succeeded to start, False otherwise Return type:bool

_request_stop()

Low level implementation of the service stop request, used by the func:stop method

Returns:True if the service succeeded to stop, False otherwise Return type:bool

alive()

exists()

classmethod is_supported(vm)

start()

state()

Check the current status of the service

Returns:Which state the service is at right now Return type:ServiceState

stop()

class lago.plugins.service.ServiceState

Bases: sphinx.ext.autodoc.Enum

ACTIVE = 2

INACTIVE = 1

MISSING = 0

This state corresponds to a service that is not available in the domain

lago.plugins.vm module

VM Plugins

There are two VM-related plugin extension points, there’s the VM Type Plugin, that allows you to modify at a higher level the inner workings of the VM class (domain concept in the initfile). The other plugin extension point, the [VM Provider Plugin], that allows you to create an alternative implementation of the provisioning details for the VM, for example, using a remote libvirt instance or similar.

exception lago.plugins.vm.ExtractPathError

Bases: lago.plugins.vm.VMError

exception lago.plugins.vm.ExtractPathNoPathError

Bases: lago.plugins.vm.VMError

exception lago.plugins.vm.VMError

Bases: exceptions.Exception

class lago.plugins.vm.VMPlugin(env, spec)

Bases: lago.plugins.Plugin

_abc_cache = <_weakrefset.WeakSet object>

_abc_negative_cache = <_weakrefset.WeakSet object>

_abc_negative_cache_version = 29

_abc_registry = <_weakrefset.WeakSet object>

_artifact_paths()

_detect_service_provider()

_get_service_provider()

NOTE: Can be reduced to just one get call once we remove support for the service_class spec entry

Returns:class for the loaded provider for that vm_spec None: if no provider was specified in the vm_spec Return type:class

_get_vm_provider()

classmethod _normalize_spec(spec)

_scp(*args, **kwds)

_template_metadata()

alive()

all_ips()

bootstrap(*args, **kwargs)

Thin method that just uses the provider

collect_artifacts(host_path, ignore_nopath)

copy_from(remote_path, local_path, recursive=True, propagate_fail=True)

copy_to(local_path, remote_path, recursive=True)

create_snapshot(name, *args, **kwargs)

Thin method that just uses the provider

defined(*args, **kwargs)

Thin method that just uses the provider

disks

distro()

export_disks(standalone=True, dst_dir=None, compress=False, *args, **kwargs)

Thin method that just uses the provider

extract_paths(paths, *args, **kwargs)

Thin method that just uses the provider

guest_agent()

has_guest_agent()

interactive_console(*args, **kwargs)

Thin method that just uses the provider

interactive_ssh(*args, **kwargs)

ip()

iscsi_name()

metadata

mgmt_name

mgmt_net

name()

nets()

nics()

reboot(*args, **kwargs)

Thin method that just uses the provider

revert_snapshot(name, *args, **kwargs)

Thin method that just uses the provider

root_password()

save(path=None)

service(*args, **kwargs)

shutdown(*args, **kwargs)

Thin method that just uses the provider

spec

ssh(command, data=None, show_output=True, propagate_fail=True, tries=None)

ssh_reachable(*args, **kwargs)

Check if the VM is reachable with ssh

Parameters:

• tries (int) – Number of tries to try connecting to the host
• propagate_fail (bool) – If set to true, this event will appear
• the log and fail the outter stage. Otherwise, it will be (in) –
• discarded. –

Returns:

True if the VM is reachable.

Return type:

bool

ssh_script(path, show_output=True)

start(*args, **kwargs)

Thin method that just uses the provider

state(*args, **kwargs)

Thin method that just uses the provider

stop(*args, **kwargs)

Thin method that just uses the provider

wait_for_ssh()

class lago.plugins.vm.VMProviderPlugin(vm)

Bases: lago.plugins.Plugin

If you want to use a custom provider for you VMs (say, ovirt for example), you have to inherit from this class, and then define the ‘default_vm_provider’ in your config to be your plugin, or explicitly specify it on each domain definition in the initfile with ‘vm-provider’ key

You will have to override at least all the abstractmethods in order to write a provider plugin, even if they are just runnig pass.

_extract_paths_scp(paths, ignore_nopath)

bootstrap(*args, **kwargs)

Does any actions needed to get the domain ready to be used, ran on prefix init.

Returns:None

create_snapshot(name, *args, **kwargs)

Take any actions needed to create a snapshot

Parameters:name (str) – Name for the snapshot, will be used as key to retrieve it later Returns:None

defined(*args, **kwargs)

Return if the domain is defined (libvirt concept), currently used only by the libvirt provider, put here to allow backwards compatibility.

Returns:True if the domain is already defined (libvirt concept) Return type:bool

export_disks(standalone, dst_dir, compress, *args, **kwargs)

Export ‘disks’ as a standalone image or a layered image.

Parameters:

• disks (list) – The names of the disks to export (None means all the disks)
• standalone (bool) – If true create a copy of the layered image else create a new disk which is a combination of the current layer and the base disk.
• dst_dir (str) – dir to place the exported images
• compress (bool) – if true, compress the exported image.

extract_paths(paths, ignore_nopath)

Extract the given paths from the domain

Parameters:

• paths (list of str) – paths to extract
• ignore_nopath (boolean) – if True will ignore none existing paths.

Returns:

None

Raises:

• ExtractPathNoPathError – if a none existing path was found on the VM, and ignore_nopath is True.
• ExtractPathError – on all other failures.

interactive_console()

Run an interactive console

Returns:resulf of the interactive execution Return type:lago.utils.CommandStatus

reboot(*args, **kwargs)

Reboot a domain

Returns:None

revert_snapshot(name, *args, **kwargs)

Take any actions needed to revert/restore a snapshot

Parameters:name (str) – Name for the snapshot, same that was set on creation Returns:None

shutdown(*args, **kwargs)

Shutdown a domain

Returns:None

start(*args, **kwargs)

Start a domain

Returns:None

state(*args, **kwargs)

Return the current state of the domain

Returns:Small description of the current domain state Return type:str

stop(*args, **kwargs)

Stop a domain

Returns:None

lago.plugins.vm._resolve_service_class(class_name, service_providers)

NOTE: This must be remved once the service_class spec entry is fully deprecated

Retrieves a service plugin class from the class name instead of the provider name

Parameters:

• class_name (str) – Class name of the service plugin to retrieve
• service_providers (dict) – provider_name->provider_class of the loaded service providers

Returns:

Class of the plugin that matches that name

Return type:

class

Raises:

lago.plugins.NoSuchPluginError – if there was no service plugin that matched the search

lago.plugins.vm.check_alive(func)

lago.plugins.vm.check_defined(func)

lago.providers package

Subpackages

lago.providers.libvirt package

Submodules

lago.providers.libvirt.cpu module

class lago.providers.libvirt.cpu.CPU(spec, host_cpu)

Bases: object

cpu_xml

generate_cpu_xml()

Get CPU XML

Returns:cpu node Return type:lxml.etree.Element

generate_custom(cpu, vcpu_num, fill_topology)

Generate custom CPU model. This method attempts to convert the dict to XML, as defined by xmltodict.unparse method.

Parameters:

• cpu (dict) – CPU spec
• vcpu_num (int) – number of virtual cpus
• fill_topology (bool) – if topology is not defined in cpu and vcpu was not set, will add CPU topology to the generated CPU.

Returns:

CPU XML node

Return type:

lxml.etree.Element

Raises:

LagoInitException – when failed to convert dict to XML

generate_exact(model, vcpu_num, host_cpu)

Generate exact CPU model with nested virtualization CPU feature.

Parameters:

• model (str) – libvirt supported CPU model
• vcpu_num (int) – number of virtual cpus
• host_cpu (lxml.etree.Element) – the host CPU model

Returns:

CPU XML node

Return type:

lxml.etree.Element

generate_feature(name, policy='require')

Generate CPU feature element

Parameters:

• name (str) – feature name
• policy (str) – libvirt feature policy

Returns:

feature XML element

Return type:

lxml.etree.Element

generate_host_passthrough(vcpu_num)

Generate host-passthrough XML cpu node

Parameters:vcpu_num (int) – number of virtual CPUs Returns:CPU XML node Return type:lxml.etree.Element

generate_topology(vcpu_num, cores=1, threads=1)

Generate CPU <topology> XML child

Parameters:

• vcpu_num (int) – number of virtual CPUs
• cores (int) – number of cores
• threads (int) – number of threads

Returns:

topology XML element

Return type:

lxml.etree.Element

generate_vcpu(vcpu_num)

Generate <vcpu> domain XML child

Parameters:vcpu_num (int) – number of virtual cpus Returns:vcpu XML element Return type:lxml.etree.Element

generate_vcpu_xml(vcpu_num)

Parameters:vcpu_num (int) – number of virtual cpus Returns:vcpu XML node Return type:lxml.etree.Element

model

validate()

Validate CPU-related VM spec are compatible

Raises:LagoInitException – if both ‘cpu_model’ and ‘cpu’ are defined.

vcpu_xml

vendor

class lago.providers.libvirt.cpu.LibvirtCPU

Bases: object

Query data from /usr/share/libvirt/cpu_map.xml

classmethod get_cpu_props(family, arch='x86')

Get CPU info XML

Parameters:

• family (str) – CPU family
• arch (str) – CPU arch

Returns:

CPU xml

Return type:

lxml.etree.Element

Raises:

LagoException – If no such CPU family exists

classmethod get_cpu_vendor(family, arch='x86')

Get CPU vendor, if vendor is not available will return ‘generic’

Parameters:

• family (str) – CPU family
• arch (str) – CPU arch

Returns:

CPU vendor if found otherwise ‘generic’

Return type:

str

classmethod get_cpus_by_arch(arch)

Get all CPUs info by arch

Parameters:arch (str) – CPU architecture Returns:CPUs by arch XML Return type:lxml.etree.element Raises:LagoException – If no such ARCH is found

lago.providers.libvirt.network module

class lago.providers.libvirt.network.BridgeNetwork(env, spec, compat)

Bases: lago.providers.libvirt.network.Network

_libvirt_xml()

start()

stop()

class lago.providers.libvirt.network.NATNetwork(env, spec, compat)

Bases: lago.providers.libvirt.network.Network

_generate_dns_disable()

_generate_dns_forward(forward_ip)

_generate_main_dns(records, subnet, forward_plain='no')

_ipv6_prefix(subnet, const='fd8f:1391:3a82:')

_libvirt_xml()

class lago.providers.libvirt.network.Network(env, spec, compat)

Bases: object

_libvirt_name()

_libvirt_xml()

add_mapping(name, ip, save=True)

add_mappings(mappings)

alive()

gw()

is_management()

mapping()

name()

resolve(name)

save()

spec

start(attempts=5, timeout=2)

Start the network, will check if the network is active attempts times, waiting timeout between each attempt.

Parameters:

• attempts (int) – number of attempts to check the network is active
• timeout (int) – timeout for each attempt

Returns:

None

Raises:

• RuntimeError – if network creation failed, or failed to verify it is
• active.

stop()

lago.providers.libvirt.utils module

Utilities to help deal with the libvirt python bindings

lago.providers.libvirt.utils.DOMAIN_STATES = {<class 'sphinx.ext.autodoc.VIR_DOMAIN_SHUTOFF'>: 'shut off', <class 'sphinx.ext.autodoc.VIR_DOMAIN_PAUSED'>: 'paused', <class 'sphinx.ext.autodoc.VIR_DOMAIN_SHUTDOWN'>: 'beign shut down', <class 'sphinx.ext.autodoc.VIR_DOMAIN_BLOCKED'>: 'blocked', <class 'sphinx.ext.autodoc.VIR_DOMAIN_PMSUSPENDED'>: 'suspended', <class 'sphinx.ext.autodoc.VIR_DOMAIN_NOSTATE'>: 'no state', <class 'sphinx.ext.autodoc.VIR_DOMAIN_RUNNING'>: 'running', <class 'sphinx.ext.autodoc.VIR_DOMAIN_CRASHED'>: 'crashed'}

Mapping of domain statuses values to human readable strings

class lago.providers.libvirt.utils.Domain

Bases: object

Class to namespace libvirt domain related helpers

static resolve_state(state_number)

Get a nice description from a domain state number

Parameters:state_number (list of int) – State number as returned by libvirt.virDomain.state() Returns:

small human readable description of the domain state, unknown

if the state is not in the known list

Return type:str

lago.providers.libvirt.utils.LIBVIRT_CONNECTIONS = {}

Singleton with the cached opened libvirt connections

lago.providers.libvirt.utils.auth_callback(credentials, user_data)

lago.providers.libvirt.utils.dict_to_xml(spec, full_document=False)

Convert dict to XML

Parameters:

• spec (dict) – dict to convert
• full_document (bool) – whether to add XML headers

Returns:

XML tree

Return type:

lxml.etree.Element

lago.providers.libvirt.utils.get_libvirt_connection(name, libvirt_url='qemu://system')

lago.providers.libvirt.utils.get_template(basename)

Load a file as a string from the templates directory

Parameters:basename (str) – filename Returns:string representation of the file Return type:str

lago.providers.libvirt.vm module

class lago.providers.libvirt.vm.LocalLibvirtVMProvider(vm)

Bases: lago.plugins.vm.VMProviderPlugin

_create_dead_snapshot(name)

_create_live_snapshot(name)

_extract_paths_gfs(paths, ignore_nopath)

_libvirt_name()

_libvirt_xml()

_load_domain_xml()

_reclaim_disk(path)

_reclaim_disks()

_shutdown(libvirt_cmd, ssh_cmd, msg)

Choose the invoking method (using libvirt or ssh) to shutdown / poweroff the domain.

If acpi is defined in the domain use libvirt, otherwise use ssh.

Parameters:

• libvirt_cmd (function) – Libvirt function the invoke
• ssh_cmd (list of str) – Shell command to invoke on the domain
• msg (str) – Name of the command that should be inserted to the log message.

Returns

None

Raises:RuntimeError – If acpi is not configured an ssh isn’t available

bootstrap()

cpu_model

VM CPU model

Returns:CPU model Return type:str

cpu_vendor

VM CPU Vendor

Returns:CPU vendor Return type:str

create_snapshot(name)

defined()

export_disks(standalone, dst_dir, compress, *args, **kwargs)

Exports all the disks of self. For each disk type, handler function should be added.

Parameters:

• standalone (bool) – if true, merge the base images and the layered image into a new file (Supported only in qcow2 format)
• dst_dir (str) – dir to place the exported disks
• compress (bool) – if true, compress each disk.

extract_paths(paths, ignore_nopath)

Extract the given paths from the domain

Attempt to extract all files defined in paths with the method defined in extract_paths(), if it fails, will try extracting the files with libguestfs.

Parameters:

• paths (list of str) – paths to extract
• ignore_nopath (boolean) – if True will ignore none existing paths.

Returns:

None

Raises:

• ExtractPathNoPathError – if a none existing path was found on the VM, and ignore_nopath is True.
• ExtractPathError – on all other failures.

interactive_console(*args, **kwargs)

Opens an interactive console

Returns:result of the virsh command execution Return type:lago.utils.CommandStatus

reboot(*args, **kwargs)

revert_snapshot(name)

shutdown(*args, **kwargs)

start()

state()

Return a small description of the current status of the domain

Returns:small description of the domain status, ‘down’ if it’s not defined at all. Return type:str

stop()

lago.providers.libvirt.vm._guestfs_copy_path(guestfs_conn, guest_path, host_path)

Submodules

lago.brctl module

lago.brctl._brctl(command, *args)

lago.brctl._set_link(name, state)

lago.brctl.create(name, stp=True)

lago.brctl.destroy(name)

lago.brctl.exists(name)

lago.build module

class lago.build.Build(name, disk_path, paths)

Bases: object

A Build object represents a build section in the init file. Each build section (which in turn belongs to a specific disk) should get his own Build object

In order to add support for a new build command, a new function with the name of the command should be implemented in this class. this function should accept a list of options and arguments and return a named tuple ‘Command’, where ‘Command.name’ is the name of the command and ‘Command.cmd’ is the a list containing the command and its args, for example: Command.name = ‘virt-customize’ Command.cmd = [‘virt-customize’, ‘-a’, PATH_TO_DISk, SOME_CMDS...]

name

str – The name of the vm this builder belongs

disk_path

str – The path to the disk that needs to be customized

paths

lago.paths.Paths – The paths of the current prefix

build_cmds

list of str – A list of commands that should be invoked on the disk located in disk_path

build()

Run all the commands in self.build_cmds

Raises:lago.build.BuildException – If a command returned a non-zero code

get_cmd_handler(cmd)

Return an handler for cmd. The handler and the command should have the same name. See class description for more info about handlers.

Parameters:cmd (str) – The name of the command Returns:which handles cmd Return type:callable Raises:lago.build.BuildException – If an handler for cmd doesn’t exist

classmethod get_instance_from_build_spec(name, disk_path, build_spec, paths)

Parameters:

• name (str) – The name of the vm this builder belongs
• disk_path (str) – The path to the disk that needs to be customized
• paths (lago.paths.Paths) – The paths of the current prefix
• build_spec (dict) – The build spec part, associated with the disk located at disk_path, from the init file.

Returns:

An instance of Build with a normalized build spec i.e ready to

be invoked.

normalize_build_spec(build_spec)

Convert a build spec into a list of Command tuples. After running this command, self.build_cmds should hold all the commands that should be run on the disk in self.disk_path.

Parameters:build_spec (dict) – The buildspec part from the init file

static normalize_options(options)

Turns a mapping of ‘option: arg’ to a list and prefix the options. for example:

dict = {

o1: a1, o2: , o3: a3,

}

will be transformed to:

[prefix_option(o1), a1, prefix_option(o2), prefix_option(o3), a3]

note that empty arguments are omitted

Parameters:options (dict) – A mapping between options and arguments Returns:A normalized version of ‘options’ as mentioned above Return type:lst

static prefix_option(option)

Depends on the option’s length, prefix it with ‘-‘ or ‘–’ :param option: The option to prefix :type option: str

Returns:prefixed option Return type:str

virt_customize(options)

Handler for ‘virt-customize’ note: if ‘ssh-inject’ option was specified without a path to a key, the prefix’ key will be copied to the vm.

Parameters:options (lst of str) – Options and arguments for ‘virt-customize’ Returns:which handles cmd Return type:callable Raises:lago.build.BuildException – If an handler for cmd doesn’t exist

exception lago.build.BuildException

Bases: lago.utils.LagoException

class lago.build.Command(name, cmd)

Bases: tuple

__getnewargs__()

Return self as a plain tuple. Used by copy and pickle.

__getstate__()

Exclude the OrderedDict from pickling

__repr__()

Return a nicely formatted representation string

_asdict()

Return a new OrderedDict which maps field names to their values

_fields = ('name', 'cmd')

classmethod _make(iterable, new=<built-in method __new__ of type object at 0x906d60>, len=<built-in function len>)

Make a new Command object from a sequence or iterable

_replace(_self, **kwds)

Return a new Command object replacing specified fields with new values

cmd

Alias for field number 1

name

Alias for field number 0

lago.cmd module

lago.cmd.check_group_membership()

lago.cmd.create_parser(cli_plugins, out_plugins)

lago.cmd.main()

lago.config module

class lago.config.ConfigLoad(root_section='lago')

Bases: object

Merges configuration parameters from 3 different sources: 1. Enviornment vairables 2. config files in .INI format 3. argparse.ArgumentParser

The assumed order(but not necessary) order of calls is: load() - load from config files and environment variables update_parser(parser) - update from the declared argparse parser update_args(args) - update from passed arguments to the parser

__getitem__(key)

Get a variable from the default section, good for fail-fast if key does not exists.

Parameters:key (str) – key Returns:config variable Return type:str

get(*args)

Get a variable from the default section :param *args: dict.get() args :type *args: args

Returns:config variable Return type:str

get_ini(defaults_only=False, incl_unset=False)

Return the config dictionary in INI format :param defaults_only: if set, will ignore arguments set by the CLI. :type defaults_only: bool

Returns:string of the config file in INI format Return type:str

get_section(*args)

get a section dictionary Args:

Returns:section config dictionary Return type:dict

load()

Load all configuration from INI format files and ENV, always preferring the last read. Order of loading is: 1) Custom paths as defined in constants.CONFS_PATH 2) XDG standard paths 3) Environment variables

Returns:dict of section configuration dicts Return type:dict

update_args(args)

Update config dictionary with parsed args, as resolved by argparse. Only root positional arguments that already exist will overridden.

Parameters:args (namespace) – args parsed by argparse

update_parser(parser)

Update config dictionary with declared arguments in an argparse.parser New variables will be created, and existing ones overridden.

Parameters:parser (argparse.ArgumentParser) – parser to read variables from

lago.config._get_configs_path()

Get a list of possible configuration files, from the following sources: 1. All files that exists in constants.CONFS_PATH. 2. All XDG standard config files for “lago.conf”, in reversed order of importance.

Returns:list of files Return type:list(str)

lago.config.get_env_dict(root_section)

Read all Lago variables from the environment. The lookup format is: LAGO_VARNAME - will land into ‘lago’ section LAGO__SECTION1__VARNAME - will land into ‘section1’ section, notice the double ‘__’. LAGO__LONG_SECTION_NAME__VARNAME - will land into ‘long_section_name’

Returns:dict of section configuration dicts Return type:dict

Examples

>>> os.environ['LAGO_GLOBAL_VAR'] = 'global'
>>> os.environ['LAGO__INIT__REPO_PATH'] = '/tmp/store'
>>>
>>> config.get_env_dict()
{'init': {'repo_path': '/tmp/store'}, 'lago': {'global_var': 'global'}}

lago.constants module

lago.constants.CONFS_PATH = ['/etc/lago/lago.conf']

CONFS_PATH - default path to first look for configuration files.

lago.constants.LIBEXEC_DIR = '/usr/libexec/lago/'

LIBEXEC_DIR -

lago.dirlock module

lago.dirlock._lock_path(path)

lago.dirlock.lock(path, excl, key_path)

Waits until the given directory can be locked

Parameters:

• path (str) – Path of the directory to lock
• excl (bool) – If the lock should be exclusive
• key_path (str) – path to the file that contains the uid to use when locking

Returns:

None

lago.dirlock.trylock(path, excl, key_path)

Tries once to get a lock to the given dir

Parameters:

• path (str) – path to the directory to lock
• excl (bool) – If the lock should be exclusive
• key_path (str) – path to the file that contains the uid to use when locking

Returns:

True if it did get a lock, False otherwise

Return type:

bool

lago.dirlock.unlock(path, key_path)

Removes the lock of the uid in the given key file

Parameters:

• path (str) – Path of the directory to lock
• key_path (str) – path to the file that contains the uid to remove the lock of

Returns:

None

lago.export module

class lago.export.DiskExportManager(dst, disk_type, disk, do_compress)

Bases: object

ExportManager object is responsible on the export process of an image from the current Lago prefix.

DiskExportManger is the base class of specific ExportManagers. Each specific ExportManger is responsible on the export process of an image with a specific type (e.g template, file...)

src

str – Path to the image that should be exported

name

str – The name of the exported disk

dst

str – The absolute path of the exported disk

disk_type

str – The type of the image e.g template, file, empty...

disk

dict – Disk attributes (of the disk that should be exported) as found in workdir/current/virt/VM-NAME

exported_metadata

dict – A copy of the source disk metadata, this dict should be updated with new values during the export process. do_compress(bool): If true, apply compression to the exported disk.

_abc_cache = <_weakrefset.WeakSet object>

_abc_negative_cache = <_weakrefset.WeakSet object>

_abc_negative_cache_version = 29

_abc_registry = <_weakrefset.WeakSet object>

calc_sha(checksum)

Calculate the checksum of the new exported disk, write it to a file, and update this managers ‘exported_metadata’.

Parameters:checksum (str) – The type of the checksum

compress()

Compress the new exported image, Block size was taken from virt-builder page

copy()

Copy the disk using cp in order to preserves the ‘sparse’ structure of the file

export()

This method will handle the export process and should implemented in each subclass.

static get_instance_by_type(dst, disk, do_compress, *args, **kwargs)

Parameters:

• dst (str) – The path of the new exported disk. can contain env variables.
• disk (dict) – Disk attributes (of the disk that should be exported) as found in workdir/current/virt/VM-NAME
• do_compress (bool) – If true, apply compression to the exported disk.

Returns

An instance of a subclass of DiskExportManager which matches the disk type.

sparse()

Make the exported images more compact by removing unused space. Please refer to ‘virt-sparsify’ for more info.

update_lago_metadata()

write_lago_metadata()

class lago.export.FileExportManager(dst, disk_type, disk, do_compress, *args, **kwargs)

Bases: lago.export.DiskExportManager

FileExportManager is responsible exporting images of type file and empty.

standalone

bool – If true, create a new image which is the result of merging all the layers of src (the image that we want to export).

src_qemu_info

dict – Metadata on src which was generated by qemu-img.

_abc_cache = <_weakrefset.WeakSet object>

_abc_negative_cache = <_weakrefset.WeakSet object>

_abc_negative_cache_version = 29

_abc_registry = <_weakrefset.WeakSet object>

export()

See DiskExportManager.export

class lago.export.TemplateExportManager(dst, disk_type, disk, do_compress, *args, **kwargs)

Bases: lago.export.DiskExportManager

TemplateExportManager is responsible exporting images of type template.

See superclass

_abc_cache = <_weakrefset.WeakSet object>

_abc_negative_cache = <_weakrefset.WeakSet object>

_abc_negative_cache_version = 29

_abc_registry = <_weakrefset.WeakSet object>

export()

See DiskExportManager.export

rebase()

Change the backing-file entry of the exported disk. Please refer to ‘qemu-img rebase’ manual for more info.

update_lago_metadata()

lago.log_utils module

This module defines the special logging tools that lago uses

lago.log_utils.ALWAYS_SHOW_REG = <_sre.SRE_Pattern object>

Regexp that will match the above template

lago.log_utils.ALWAYS_SHOW_TRIGGER_MSG = 'force-show:%s'

Message template that will always shoud the messago

class lago.log_utils.ColorFormatter(fmt=None, datefmt=None)

Bases: logging.Formatter

Formatter to add colors to log records

CRITICAL = '\x1b[31m'

CYAN = '\x1b[36m'

DEBUG = ''

DEFAULT = '\x1b[0m'

ERROR = '\x1b[31m'

GREEN = '\x1b[32m'

INFO = '\x1b[36m'

NONE = ''

RED = '\x1b[31m'

WARNING = '\x1b[33m'

WHITE = '\x1b[37m'

YELLOW = '\x1b[33m'

classmethod colored(color, message)

Small function to wrap a string around a color

Parameters:

• color (str) – name of the color to wrap the string with, must be one of the class properties
• message (str) – String to wrap with the color

Returns:

the colored string

Return type:

str

format(record)

Adds colors to a log record and formats it with the default

Parameters:record (logging.LogRecord) – log record to format Returns:The colored and formatted record string Return type:str

class lago.log_utils.ContextLock

Bases: object

Context manager to thread lock a block of code

lago.log_utils.END_TASK_MSG = 'Success'

Message to be shown when a task is ended

lago.log_utils.END_TASK_REG = <_sre.SRE_Pattern object>

Regexp that will match the above template

lago.log_utils.END_TASK_TRIGGER_MSG = 'end task%s'

Message template that will trigger a task end

class lago.log_utils.LogTask(task, logger=<module 'logging' from '/usr/lib/python2.7/logging/__init__.pyc'>, level='info', propagate_fail=True, uuid=None)

Bases: object

Context manager for a log task

Example

>>> with LogTask('mytask'):
...     pass

lago.log_utils.START_TASK_MSG = ''

Message to be shown when a task is started

lago.log_utils.START_TASK_REG = <_sre.SRE_Pattern object>

Regexp that will match the above template

lago.log_utils.START_TASK_TRIGGER_MSG = 'start task%s'

Message template that will trigger a task

class lago.log_utils.Task(name, *args, **kwargs)

Bases: collections.deque

Small wrapper around deque to add the failed status and name to a task

name

str – name for this task

failed

bool – If this task has failed or not (if there was any error log shown during it’s execution)

force_show

bool – If set, will show any log records generated inside this task even if it’s out of nested depth limit

elapsed_time()

class lago.log_utils.TaskHandler(initial_depth=0, task_tree_depth=-1, buffer_size=2000, dump_level=40, level=0, formatter=<class 'lago.log_utils.ColorFormatter'>)

Bases: logging.StreamHandler

This log handler will use the concept of tasks, to hide logs, and will show all the logs for the current task if there’s a logged error while running that task.

It will hide any logs that belong to nested tasks that have more than task_tree_depth parent levels, and for the ones that are above that level, it will show only the logs that have a loglevel above level.

You can force showing a log record immediately if you use the log_always() function bypassing all the filters.

If there’s a log record with log level higher than dump_level it will be considered a failure, and all the logs for the current task that have a log level above level will be shown no matter at which depth the task belongs to. Also, all the parent tasks will be tagged as error.

formatter

logging.LogFormatter – formatter to use

initial_depth

int – Initial depth to account for, in case this handler was created in a subtask

tasks_by_thread (dict of str

OrderedDict of str: Task): List of thread names, and their currently open tasks with their latest log records

dump_level

int – log level from which to consider a log record as error

buffer_size

int – Size of the log record deque for each task, the bigger, the more records it can show in case of error but the more memory it will use

task_tree_depth

int – number of the nested level to show start/end task logs for, if -1 will show always

level

int – Log level to show logs from if the depth limit is not reached

main_failed

bool – used to flag from a child thread that the main should fail any current task

_tasks_lock

ContextLock – Lock for the tasks_by_thread dict

_main_thread_lock

ContextLock – Lock for the main_failed bool

TASK_INDICATORS = ['@', '#', '*', '-', '~']

List of chars to show as task prefix, to ease distinguishing them

am_i_main_thread

**Returns* – bool* – if the current thread is the main thread

close_children_tasks(parent_task_name)

Closes all the children tasks that were open

Parameters:parent_task_name (str) – Name of the parent task Returns:None

cur_depth_level

**Returns* – int* – depth level for the current task

cur_task

**Returns* – str* – the current active task

cur_thread

**Returns* – str* – Name of the current thread

emit(record)

Handle the given record, this is the entry point from the python logging facility

Params:

record (logging.LogRecord): log record to handle

Returns:None

get_task_indicator(task_level=None)

Parameters:task_level (int or None) – task depth level to get the indicator for, if None, will use the current tasks depth Returns:char to prepend to the task logs to indicate it’s level Return type:str

get_tasks(thread_name)

Parameters:thread_name (str) – name of the thread to get the tasks for Returns:

list of task names and log records for

each for the given thread

Return type:OrderedDict of str, Task

handle_closed_task(task_name, record)

Do everything needed when a task is closed

Params:

task_name (str): name of the task that is finishing record (logging.LogRecord): log record with all the info

Returns:None

handle_error()

Handles an error log record that should be shown

Returns:None

handle_new_task(task_name, record)

Do everything needed when a task is starting

Params:

task_name (str): name of the task that is starting record (logging.LogRecord): log record with all the info

Returns:None

mark_main_tasks_as_failed()

Flags to the main thread that all it’s tasks sholud fail

Returns:None

mark_parent_tasks_as_failed(task_name, flush_logs=False)

Marks all the parent tasks as failed

Parameters:

• task_name (str) – Name of the child task
• flush_logs (bool) – If True will discard all the logs form parent tasks

Returns:

None

pretty_emit(record, is_header=False, task_level=None)

Wrapper around the logging.StreamHandler emit method to add some decoration stuff to the message

Parameters:

• record (logging.LogRecord) – log record to emit
• is_header (bool) – if this record is a header, usually, a start or end task message
• task_level (int) – If passed, will take that as the current nested task level instead of calculating it from the current tasks

Returns:

None

should_show_by_depth(cur_level=None)

Parameters:cur_level (int) – depth level to take into account Returns:

True if the given depth level should show messages (not

taking into account the log level)

Return type:bool

should_show_by_level(record_level, base_level=None)

Parameters:

• record_level (int) – log level of the record to check
• base_level (int or None) – log level to check against, will use the object’s dump_level if None is passed

Returns:

True if the given log record should be shown according to the

log level

Return type:

bool

tasks

Returns –

OrderedDict of str, Task: list of task names and log records for

each for the current thread

lago.log_utils.end_log_task(task, logger=<module 'logging' from '/usr/lib/python2.7/logging/__init__.pyc'>, level='info')

Ends a log task

Parameters:

• task (str) – name of the log task to end
• logger (logging.Logger) – logger to use
• level (str) – log level to use

Returns:

None

lago.log_utils.hide_paramiko_logs()

lago.log_utils.hide_stevedore_logs()

Hides the logs of stevedore, this function was added in order to support older versions of stevedore

We are using the NullHandler in order to get rid from ‘No handlers could be found for logger...’ msg

Returns:None

lago.log_utils.log_always(message)

Wraps the given message with a tag that will make it be always logged by the task logger

Parameters:message (str) – message to wrap with the tag Returns:

tagged message that will get it shown immediately by the task

logger

Return type:str

lago.log_utils.log_task(task, logger=<module 'logging' from '/usr/lib/python2.7/logging/__init__.pyc'>, level='info', propagate_fail=True, uuid=None)

Parameterized decorator to wrap a function in a log task

Example

>>> @log_task('mytask')
... def do_something():
...     pass

lago.log_utils.setup_prefix_logging(logdir)

Sets up a file logger that will create a log in the given logdir (usually a lago prefix)

Parameters:logdir (str) – path to create the log into, will be created if it does not exist Returns:None

lago.log_utils.start_log_task(task, logger=<module 'logging' from '/usr/lib/python2.7/logging/__init__.pyc'>, level='info')

Starts a log task

Parameters:

• task (str) – name of the log task to start
• logger (logging.Logger) – logger to use
• level (str) – log level to use

Returns:

None

lago.paths module

class lago.paths.Paths(prefix)

Bases: object

images(*path)

logs()

metadata()

prefix_lagofile()

This file represents a prefix that’s initialized

prefixed(*args)

scripts(*args)

ssh_id_rsa()

ssh_id_rsa_pub()

uuid()

virt(*path)

lago.prefix module

class lago.prefix.Prefix(prefix)

Bases: object

A prefix is a directory that will contain all the data needed to setup the environment.

_prefix

str – Path to the directory of this prefix

_paths

lago.path.Paths – Path handler class

_virt_env

lago.virt.VirtEnv – Lazily loaded virtual env handler

_metadata

dict – Lazily loaded metadata

VIRT_ENV_CLASS

alias of VirtEnv

_add_dns_records(conf, mgmts)

Add DNS records dict(‘dns_records’) to conf for each management network. Add DNS forwarder IP(‘dns_forward’) for each none management network.

Parameters:

• conf (spec) – spec
• mgmts (list) – management networks names

Returns:

None

_add_mgmt_to_domains(conf, mgmts)

Add management network key(‘mgmt_net’) to each domain. Note this assumes conf was validated.

Parameters:

• conf (dict) – spec
• mgmts (list) – list of management networks names

_add_nic_to_mapping(net, dom, nic)

Populates the given net spec mapping entry with the nics of the given domain, by the following rules:

• If net is management, ‘domain_name’: nic_ip
• For each interface: ‘domain_name-eth#’: nic_ip, where # is the

index of the nic in the domain definition. * For each interface: ‘domain_name-net_name-#’: nic_ip, where # is a running number of interfaces from that network. * For each interface: ‘domain_name-net_name’, which has an identical IP to ‘domain_name-net_name-0’

Parameters:

• net (dict) – Network spec to populate
• dom (dict) – libvirt domain specification
• nic (str) – Name of the interface to add to the net mapping from the domain

Returns:

None

_allocate_ips_to_nics(conf)

For all the nics of all the domains in the conf that have dynamic ip, allocate one and addit to the network mapping

Parameters:conf (dict) – Configuration spec to extract the domains from Returns:None

_allocate_subnets(conf)

Allocate all the subnets needed by the given configuration spec

Parameters:conf (dict) – Configuration spec where to get the nets definitions from Returns:allocated subnets and modified conf Return type:tuple(list, dict)

static _check_predefined_subnets(conf)

Checks if all of the nets defined in the config are inside the allowed range, throws exception if not

Parameters:conf (dict) – Configuration spec where to get the nets definitions from Returns:None Raises:RuntimeError – If there are any subnets out of the allowed range

_config_net_topology(conf)

Initialize and populate all the network related elements, like reserving ips and populating network specs of the given confiiguration spec

Parameters:conf (dict) – Configuration spec to initalize Returns:None

_copy_delpoy_scripts(scripts)

Copy the given deploy scripts to the scripts dir in the prefix

Parameters:scripts (list of str) – list of paths of the scripts to copy to the prefix Returns:

list with the paths to the copied scripts, with a

prefixed with $LAGO_PREFIX_PATH so the full path is not hardcoded

Return type:list of str

_copy_deploy_scripts_for_hosts(domains)

Copy the deploy scripts for all the domains into the prefix scripts dir

Parameters:domains (dict) – spec with the domains info as when loaded from the initfile Returns:None

_create_disk(name, spec, template_repo=None, template_store=None)

Creates a disc with the given name from the given repo or store

Parameters:

• name (str) – Name of the domain to create the disk for
• spec (dict) – Specification of the disk to create
• template_repo (TemplateRepository or None) – template repo instance to use
• template_store (TemplateStore or None) – template store instance to use

Returns:

Path to the disk and disk metadata

Return type:

Tuple(str, dict)

Raises:

RuntimeError – If the type of the disk is not supported or failed to create the disk

_create_disks(domain_name, disks_specs, template_repo, template_store)

_create_link_to_parent(base, link_name)

_create_ssh_keys()

Generate a pair of ssh keys for this prefix

Returns:None Raises:RuntimeError – if it fails to create the keys

_create_virt_env()

Create a new virt env from this prefix

Returns:virt env created from this prefix Return type:lago.virt.VirtEnv

_deploy_host(host)

static _generate_disk_name(host_name, disk_name, disk_format)

_generate_disk_path(disk_name)

_get_scripts(host_metadata)

Temporary method to retrieve the host scripts

Parameters:host_metadata (dict) – host metadata to retrieve the scripts for Returns:deploy scripts for the host, empty if none found Return type:list

_handle_empty_disk(host_name, disk_spec)

_handle_file_disk(disk_spec)

_handle_lago_template(disk_path, template_spec, template_store, template_repo)

_handle_ova_image(domain_spec)

_handle_qcow_template(disk_path, template_spec, template_store=None, template_repo=None)

_handle_template(host_name, template_spec, template_store=None, template_repo=None)

static _init_net_specs(conf)

Given a configuration specification, initializes all the net definitions in it so they can be used comfortably

Parameters:conf (dict) – Configuration specification Returns:the adapted new conf Return type:dict

_ova_to_spec(filename)

Retrieve the given ova and makes a template of it. Creates a disk from network provided ova. Calculates the needed memory from the ovf. The disk will be cached in the template repo

Parameters:filename (str) – the url to retrive the data from

Returns:

list with the disk specification int: VM memory, None if none defined int: Number of virtual cpus, None if none defined

Return type:

list of dict

Raises:

• RuntimeError – If the ova format is not supported
• TypeError – If the memory units in the ova are noot supported (currently only ‘MegaBytes’)

_prepare_domain_image(domain_spec, prototypes, template_repo, template_store)

_prepare_domains_images(conf, template_repo, template_store)

_register_preallocated_ips(conf)

Parse all the domains in the given conf and preallocate all their ips into the networks mappings, raising exception on duplicated ips or ips out of the allowed ranges

See also

lago.subnet_lease

Parameters:conf (dict) – Configuration spec to parse Returns:None Raises:RuntimeError – if there are any duplicated ips or any ip out of the allowed range

_retrieve_disk_url(disk_url, disk_dst_path=None)

static _run_qemu(qemu_cmd, disk_path)

_save_metadata()

Write this prefix metadata to disk

Returns:None

_select_mgmt_networks(conf)

Select management networks. If no management network is found, it will mark the first network found by sorted the network lists. Also adding default DNS domain, if none is set.

Parameters:conf (spec) – spec

_set_scripts(host_metadata, scripts)

Temporary method to set the host scripts

Parameters:host_metadata (dict) – host metadata to set scripts in Returns:the updated metadata Return type:dict

_use_prototype(spec, prototypes)

Populates the given spec with the values of it’s declared prototype

Parameters:

• spec (dict) – spec to update
• prototypes (dict) – Configuration spec containing the prototypes

Returns:

updated spec

Return type:

dict

_validate_netconfig(conf)

Validate network configuration

Parameters:

conf (dict) – spec

Returns:

None

Raises:

• LagoInitException – If a VM has more than
• one management network configured, or a network which is not
• management has DNS attributes, or a VM is configured with a
• none-existence NIC, or a VM has no management network.

build(conf)

cleanup(*args, **kwargs)

Stops any running entities in the prefix and uninitializes it, usually you want to do this if you are going to remove the prefix afterwards

Returns:None

collect_artifacts(*args, **kwargs)

create_snapshots(name)

Creates one snapshot on all the domains with the given name

Parameters:name (str) – Name of the snapshots to create Returns:None

deploy(*args, **kwargs)

destroy()

Destroy this prefix, running any cleanups and removing any files inside it.

export_vms(vms_names, standalone, export_dir, compress, init_file_name, out_format)

fetch_url(url)

Retrieves the given url to the prefix

Parameters:url (str) – Url to retrieve Returns:path to the downloaded file Return type:str

get_nets()

Retrieve info on all the nets from all the domains

Returns:dictionary with net_name -> net list Return type:dict of str->list(str)

get_snapshots()

Retrieve info on all the snapshots from all the domains

Returns:list(str): dictionary with vm_name -> snapshot list Return type:dict of str

get_vms()

Retrieve info on all the vms

Returns:dictionary with vm_name -> vm list Return type:dict of str->list(str)

initialize(*args, **kwargs)

Initialize this prefix, this includes creating the destination path, and creating the uuid for the prefix, for any other actions see Prefix.virt_conf()

Will safely roll back if any of those steps fail

Returns:None Raises:RuntimeError – If it fails to create the prefix dir

classmethod is_prefix(path)

Check if a path is a valid prefix

Parameters:path (str) – path to be checked Returns:True if the given path is a prefix Return type:bool

metadata

Retrieve the metadata info for this prefix

Returns:metadata info Return type:dict

resolve_parent(disk_path, template_store, template_repo)

Given a virtual disk, checks if it has a backing file, if so check if the backing file is in the store, if not download it from the provided template_repo.

After verifying that the backing-file is in the store, create a symlink to that file and locate it near the layered image.

Parameters:

• disk_path (str) – path to the layered disk
• template_repo (TemplateRepository or None) – template repo instance to use
• template_store (TemplateStore or None) – template store instance to use

classmethod resolve_prefix_path(start_path=None)

Look for an existing prefix in the given path, in a path/.lago dir, or in a .lago dir under any of it’s parent directories

Parameters:start_path (str) – path to start the search from, if None passed, it will use the current dir Returns:path to the found prefix Return type:str Raises:RuntimeError – if no prefix was found

revert_snapshots(name)

Revert all the snapshots with the given name from all the domains

Parameters:name (str) – Name of the snapshots to revert Returns:None

save()

Save this prefix to persistent storage

Returns:None

shutdown(vm_names=None, reboot=False)

Shutdown this prefix

Parameters:

• vm_names (list of str) – List of the vms to shutdown
• reboot (bool) – If true, reboot the requested vms

Returns:

None

start(vm_names=None)

Start this prefix

Parameters:vm_names (list of str) – List of the vms to start Returns:None

stop(vm_names=None)

Stop this prefix

Parameters:vm_names (list of str) – List of the vms to stop Returns:None

virt_conf(conf, template_repo=None, template_store=None, do_bootstrap=True, do_build=True)

Initializes all the virt infrastructure of the prefix, creating the domains disks, doing any network leases and creating all the virt related files and dirs inside this prefix.

Parameters:

• conf (dict) – Configuration spec
• template_repo (TemplateRepository) – template repository intance
• template_store (TemplateStore) – template store instance
• do_bootstrap (bool) – If true run virt-sysprep on the images
• do_build (bool) – If true run build commands on the images, see lago.build.py for more info.

Returns:

None

virt_conf_from_stream(conf_fd, template_repo=None, template_store=None, do_bootstrap=True, do_build=True)

Initializes all the virt infrastructure of the prefix, creating the domains disks, doing any network leases and creating all the virt related files and dirs inside this prefix.

Parameters:

• conf_fd (File) – File like object to read the config from
• template_repo (TemplateRepository) – template repository intance
• template_store (TemplateStore) – template store instance

Returns:

None

virt_env

Getter for this instance’s virt env, creates it if needed

Returns:virt env instance used by this prefix Return type:lago.virt.VirtEnv

lago.prefix._create_ip(subnet, index)

Given a subnet or an ip and an index returns the ip with that lower index from the subnet (255.255.255.0 mask only subnets)

Parameters:

• subnet (str) – Strign containing the three first elements of the decimal representation of a subnet (X.Y.Z) or a full ip (X.Y.Z.A)
• index (int or str) – Last element of a decimal ip representation, for example, 123 for the ip 1.2.3.123

Returns:

The dotted decimal representation of the ip

Return type:

str

lago.prefix._ip_in_subnet(subnet, ip)

Checks if an ip is included in a subnet.

Note

only 255.255.255.0 masks allowed

Parameters:

• subnet (str) – Strign containing the three first elements of the decimal representation of a subnet (X.Y.Z) or a full ip (X.Y.Z.A)
• ip (str or int) – Decimal ip representation

Returns:

True if ip is in subnet, False otherwise

Return type:

bool

lago.service module

class lago.service.SysVInitService(vm, name)

Bases: lago.plugins.service.ServicePlugin

BIN_PATH = '/sbin/service'

_abc_cache = <_weakrefset.WeakSet object>

_abc_negative_cache = <_weakrefset.WeakSet object>

_abc_negative_cache_version = 29

_abc_registry = <_weakrefset.WeakSet object>

_request_start()

_request_stop()

state()

class lago.service.SystemdContainerService(vm, name)

Bases: lago.plugins.service.ServicePlugin

BIN_PATH = '/usr/bin/docker'

HOST_BIN_PATH = '/usr/bin/systemctl'

_abc_cache = <_weakrefset.WeakSet object>

_abc_negative_cache = <_weakrefset.WeakSet object>

_abc_negative_cache_version = 29

_abc_registry = <_weakrefset.WeakSet object>

_request_start()

_request_stop()

state()

class lago.service.SystemdService(vm, name)

Bases: lago.plugins.service.ServicePlugin

BIN_PATH = '/usr/bin/systemctl'

_abc_cache = <_weakrefset.WeakSet object>

_abc_negative_cache = <_weakrefset.WeakSet object>

_abc_negative_cache_version = 29

_abc_registry = <_weakrefset.WeakSet object>

_request_start()

_request_stop()

state()

lago.ssh module

lago.ssh._gen_ssh_command_id()

lago.ssh.drain_ssh_channel(chan, stdin=None, stdout=<open file '<stdout>', mode 'w'>, stderr=<open file '<stderr>', mode 'w'>)

lago.ssh.get_ssh_client(ip_addr, ssh_key=None, host_name=None, ssh_tries=None, propagate_fail=True, username='root', password='123456')

lago.ssh.interactive_ssh(ip_addr, command=None, host_name=None, ssh_key=None, username='root', password='123456')

lago.ssh.interactive_ssh_channel(chan, command=None, stdin=<open file '<stdin>', mode 'r'>)

lago.ssh.ssh(ip_addr, command, host_name=None, data=None, show_output=True, propagate_fail=True, tries=None, ssh_key=None, username='root', password='123456')

lago.ssh.ssh_script(ip_addr, path, host_name=None, show_output=True, ssh_key=None, username='root', password='123456')

lago.ssh.wait_for_ssh(ip_addr, host_name=None, connect_timeout=600, ssh_key=None, username='root', password='123456')

lago.subnet_lease module

Module that handles the leases for the subnets of the virtual network interfaces.

Note

Currently only /24 ranges are handled, and all of them under the 192.168.MIN_SUBNET to 192.168.MAX_SUBNET ranges

The leases are stored under LEASE_DIR as json files with the form:

[
    "/path/to/prefix/uuid/file",
    "uuid_hash",
]

Where the uuid_hash is the 32 char uuid of the prefix (the contents of the uuid file at the time of doing the lease)

lago.subnet_lease.MAX_SUBNET = 209

Upper range for the allowed subnets

lago.subnet_lease.MIN_SUBNET = 200

Lower range for the allowed subnets

lago.subnet_lease._acquire(*args, **kwargs)

Lease a free network for the given uuid path

Parameters:uuid_path (str) – Path to the uuid file of a lago.Prefix Returns:

the third element of the dotted ip of the leased network

or None if no lease was available

Return type:int or None

lago.subnet_lease._lease_owned(path, current_uuid_path)

Checks if the given lease is owned by the prefix whose uuid is in the given path

Note

The prefix must be also in the same path it was when it took the lease

Parameters:

• path (str) – Path to the lease
• current_uuid_path (str) – Path to the uuid to check ownersip of

Returns:

True if the given lease in owned by the prefix, False

otherwise

Return type:

bool

lago.subnet_lease._lease_valid(path)

Checs if the given lease still has a prefix that owns it

Parameters:path (str) – Path to the lease Returns:

True if the uuid path in the lease still exists and is the

same as the one in the lease

Return type:bool

lago.subnet_lease._locked(func)

Decorator that will make sure that you have the exclusive lock for the leases

lago.subnet_lease._release(*args, **kwargs)

Free the lease of the given subnet index

Parameters:index (int) – Third element of a dotted ip representation of the subnet, for example, for 1.2.3.4 it would be 3 Returns:None

lago.subnet_lease._take_lease(path, uuid_path)

Persist to the given leases path the prefix uuid that’s in the uuid path passed

Parameters:

• path (str) – Path to the leases file
• uuid_path (str) – Path to the prefix uuid

Returns:

None

lago.subnet_lease._validate_lease_dir_present(func)

Decorator that will ensure that the lease dir exists, creating it if necessary

lago.subnet_lease.acquire(uuid_path)

Lease a free network for the given uuid path

Parameters:uuid_path (str) – Path to the uuid file of a lago.Prefix Returns:the dotted ip of the gateway for the leased net Return type:str

lago.subnet_lease.is_leasable_subnet(subnet)

Checks if a given subnet is inside the defined provisionable range

Parameters:subnet (str) – Subnet or ip in dotted decimal format Returns:True if subnet is inside the range, False otherwise Return type:bool

lago.subnet_lease.release(subnet)

Free the lease of the given subnet

Parameters:subnet (str) – dotted ip or network to free the lease of Returns:None

lago.sysprep module

lago.sysprep._config_net_interface(iface, **kwargs)

lago.sysprep._upload_file(local_path, remote_path)

lago.sysprep._write_file(path, content)

lago.sysprep.add_ssh_key(key, with_restorecon_fix=False)

lago.sysprep.config_net_interface_dhcp(iface, hwaddr)

lago.sysprep.edit(filename, expression)

lago.sysprep.set_hostname(hostname)

lago.sysprep.set_iscsi_initiator_name(name)

lago.sysprep.set_root_password(password)

lago.sysprep.set_selinux_mode(mode)

lago.sysprep.sysprep(disk, mods, backend='direct')

lago.sysprep.update()

lago.templates module

This module contains any disk template related classes and functions, including the repository store manager classes and template providers, some useful definitions:

• Template repositories:

  Repository where to fetch templates from, as an http server

• Template store:

  Local store to cache templates

• Template:

  Unititialized disk image to use as base for other disk images

• Template version:

  Specific version of a template, to allow getting updates without having to change the template name everywhere

class lago.templates.FileSystemTemplateProvider(root)

Handles file type templates, that is, getting a disk template from the host’s filesystem

_prefixed(*path)

Join all the given paths prefixed with this provider’s base root path

Parameters:*path (str) – sections of the path to join, passed as positional arguments Returns:Joined paths prepended with the provider root path Return type:str

download_image(handle, dest)

Copies over the handl to the destination

Parameters:

• handle (str) – path to copy over
• dest (str) – path to copy to

Returns:

None

get_hash(handle)

Returns the associated hash for the given handle, the hash file must exist (handle + '.hash').

Parameters:handle (str) – Path to the template to get the hash from Returns:Hash for the given handle Return type:str

get_metadata(handle)

Returns the associated metadata info for the given handle, the metadata file must exist (handle + '.metadata').

Parameters:handle (str) – Path to the template to get the metadata from Returns:Metadata for the given handle Return type:dict

class lago.templates.HttpTemplateProvider(baseurl)

This provider allows the usage of http urls for templates

download_image(handle, dest)

Downloads the image from the http server

Parameters:

• handle (str) – url from the self.baseurl to the remote template
• dest (str) – Path to store the downloaded url to, must be a file path

Returns:

None

static extract_if_needed(path)

get_hash(handle)

Get the associated hash for the given handle, the hash file must exist (handle + '.hash').

Parameters:handle (str) – Path to the template to get the hash from Returns:Hash for the given handle Return type:str

get_metadata(handle)

Returns the associated metadata info for the given handle, the metadata file must exist (handle + '.metadata'). If the given handle has an .xz extension, it will get removed when calculating the handle metadata path

Parameters:handle (str) – Path to the template to get the metadata from Returns:Metadata for the given handle Return type:dict

open_url(url, suffix='', dest=None)

Opens the given url, trying the compressed version first. The compressed version url is generated adding the .xz extension to the url and adding the given suffix after that .xz extension. If dest passed, it will download the data to that path if able

Parameters:

• url (str) – relative url from the self.baseurl to retrieve
• suffix (str) – optional suffix to append to the url after adding the compressed extension to the path
• dest (str or None) – Path to save the data to

Returns:

response object to read from (lazy read), closed

if no dest passed

Return type:

urllib.addinfourl

Raises:

RuntimeError – if the url gave http error when retrieving it

class lago.templates.Template(name, versions)

Disk image template class

name

str – Name of this template

_versions (dict(str

TemplateVersion)): versions for this template

get_latest_version()

Retrieves the latest version for this template, the latest being the one with the newest timestamp

Returns:TemplateVersion

get_version(ver_name=None)

Get the given version for this template, or the latest

Parameters:ver_name (str or None) – Version to retieve, None for the latest Returns:

The version matching the given name or the latest

one

Return type:TemplateVersion

class lago.templates.TemplateRepository(dom)

A template repository is a single source for templates, that uses different providers to actually retrieve them. That means for example that the ‘ovirt’ template repository, could support the ‘http’ and a theoretical ‘gluster’ template providers.

_dom

dict – Specification of the template

_providers

dict – Providers instances for any source in the spec

_get_provider(spec)

Get the provider for the given template spec

Parameters:spec (dict) – Template spec Returns:A provider instance for that spec Return type:HttpTemplateProvider or FileSystemTemplateProvider

classmethod from_url(path)

Instantiate a TemplateRepository instance from the data in a file or url

Parameters:path (str) – Path or url to the json file to load Returns:A new instance Return type:TemplateRepository

get_by_name(name)

Retrieve a template by it’s name

Parameters:name (str) – Name of the template to retrieve Raises:KeyError – if no template is found

name

Getter for the template repo name

Returns:the name of this template repo Return type:str

class lago.templates.TemplateStore(path)

Local cache to store templates

The store uses various files to keep track of the templates cached, access and versions. An example template store looks like:

$ tree /var/lib/lago/store/
/var/lib/lago/store/
├── in_office_repo:centos6_engine:v2.tmp
├── in_office_repo:centos7_engine:v5.tmp
├── in_office_repo:fedora22_host:v2.tmp
├── phx_repo:centos6_engine:v2
├── phx_repo:centos6_engine:v2.hash
├── phx_repo:centos6_engine:v2.metadata
├── phx_repo:centos6_engine:v2.users
├── phx_repo:centos7_engine:v4.tmp
├── phx_repo:centos7_host:v4.tmp
└── phx_repo:storage-nfs:v1.tmp

There you can see the files:

• *.tmp

  Temporary file created while downloading the template from the repository (depends on the provider)

• ${repo_name}:${template_name}:${template_version}

  This file is the actual disk image template

• *.hash

  Cached hash for the template disk image

• *.metadata

  Metadata for this template image in json format, usually this includes the distro and root-password

__contains__(temp_ver)

Checks if a given version is in this store

Parameters:temp_ver (TemplateVersion) – Version to look for Returns:True if the version is in this store Return type:bool

_prefixed(*path)

Join the given paths and prepend this stores path

Parameters:*path (str) – list of paths to join, as positional arguments Returns:all the paths joined and prepended with the store path Return type:str

download(temp_ver, store_metadata=True)

Retrieve the given template version

Parameters:

• temp_ver (TemplateVersion) – template version to retrieve
• store_metadata (bool) – If set to False, will not refresh the local metadata with the retrieved one

Returns:

None

get_path(temp_ver)

Get the path of the given version in this store

Parameters:TemplateVersion (temp_ver) – version to look for Returns:The path to the template version inside the store Return type:str Raises:RuntimeError – if the template is not in the store

get_stored_hash(temp_ver)

Retrieves the hash for the given template version from the store

Parameters:temp_ver (TemplateVersion) – template version to retrieve the hash for Returns:hash of the given template version Return type:str

get_stored_metadata(temp_ver)

Retrieves the metadata for the given template version from the store

Parameters:temp_ver (TemplateVersion) – template version to retrieve the metadata for Returns:the metadata of the given template version Return type:dict

class lago.templates.TemplateVersion(name, source, handle, timestamp)

Each template can have multiple versions, each of those is actually a different disk template file representation, under the same base name.

download(destination)

Retrieves this template to the destination file

Parameters:destination (str) – file path to write this template to Returns:None

get_hash()

Returns the associated hash for this template version

Returns:Hash for this version Return type:str

get_metadata()

Returns the associated metadata info for this template version

Returns:Metadata for this version Return type:dict

timestamp()

Getter for the timestamp

lago.templates._locked(func)

Decorator that ensures that the decorated function has the lock of the repo while running, meant to decorate only bound functions for classes that have lock_path method.

lago.templates.find_repo_by_name(name, repo_dir=None)

Searches the given repo name inside the repo_dir (will use the config value ‘template_repos’ if no repo dir passed), will rise an exception if not found

Parameters:

• name (str) – Name of the repo to search
• repo_dir (str) – Directory where to search the repo

Returns:

path to the repo

Return type:

str

Raises:

RuntimeError – if not found

lago.utils module

class lago.utils.CommandStatus

Bases: lago.utils.CommandStatus

class lago.utils.EggTimer(timeout)

elapsed()

class lago.utils.ExceptionTimer(timeout)

Bases: object

start()

stop()

exception lago.utils.LagoException

Bases: exceptions.Exception

exception lago.utils.LagoInitException

Bases: lago.utils.LagoException

exception lago.utils.LagoUserException

Bases: lago.utils.LagoException

class lago.utils.LockFile(path, timeout=None, **kwargs)

Bases: object

Context manager that creates a lock around a directory, with optional timeout in the acquire operation

Parameters:

• path (str) – path to the dir to lock
• timeout (int) – timeout in seconds to wait while acquiring the lock
• **kwargs (dict) – Any other param to pass to lockfile.LockFile

__enter__()

Start the lock with timeout if needed in the acquire operation

Raises:TimerException – if the timeout is reached before acquiring the lock

class lago.utils.RollbackContext(*args)

Bases: object

A context manager for recording and playing rollback. The first exception will be remembered and re-raised after rollback

Sample usage: > with RollbackContext() as rollback: > step1() > rollback.prependDefer(lambda: undo step1) > def undoStep2(arg): pass > step2() > rollback.prependDefer(undoStep2, arg)

More examples see tests/utilsTests.py @ vdsm code

__exit__(exc_type, exc_value, traceback)

If this function doesn’t return True (or raises a different exception), python re-raises the original exception once this function is finished.

clear()

defer(func, *args, **kwargs)

prependDefer(func, *args, **kwargs)

exception lago.utils.TimerException

Bases: exceptions.Exception

Exception to throw when a timeout is reached

class lago.utils.VectorThread(targets)

join_all(raise_exceptions=True)

start_all()

lago.utils._CommandStatus

alias of CommandStatus

lago.utils._add_subparser_to_cp(cp, section, actions, incl_unset)

lago.utils._ret_via_queue(func, queue)

lago.utils._run_command(command, input_data=None, stdin=None, out_pipe=-1, err_pipe=-1, env=None, uuid=None, **kwargs)

Runs a command

Parameters:

• command (list of str) – args of the command to execute, including the command itself as command[0] as [‘ls’, ‘-l’]
• input_data (str) – If passed, will feed that data to the subprocess through stdin
• out_pipe (int or file) – File descriptor as passed to :ref:subprocess.Popen to use as stdout
• stdin (int or file) – File descriptor as passed to :ref:subprocess.Popen to use as stdin
• err_pipe (int or file) – File descriptor as passed to :ref:subprocess.Popen to use as stderr
• of str (env(dict) – str): If set, will use the given dict as env for the subprocess
• uuid (uuid) – If set the command will be logged with the given uuid converted to string, otherwise, a uuid v4 will be generated.
• **kwargs – Any other keyword args passed will be passed to the :ref:subprocess.Popen call

Returns:

result of the interactive execution

Return type:

lago.utils.CommandStatus

lago.utils.add_timestamp_suffix(base_string)

lago.utils.argparse_to_ini(parser, root_section='lago', incl_unset=False)

lago.utils.compress(input_file, block_size, fail_on_error=True)

lago.utils.cp(input_file, output_file, fail_on_error=True)

lago.utils.deepcopy(original_obj)

Creates a deep copy of an object with no crossed referenced lists or dicts, useful when loading from yaml as anchors generate those cross-referenced dicts and lists

Parameters:original_obj (object) – Object to deep copy Returns:deep copy of the object Return type:object

lago.utils.filter_spec(spec, paths, wildcard='*', separator='/')

Remove keys from a spec file. For example, with the following path: domains//disks//metadata all the metadata dicts from all domains disks will be removed.

Parameters:

• spec (dict) – spec to remove keys from
• paths (list) – list of paths to the keys that should be removed
• wildcard (str) – wildcard character
• separator (str) – path separator

Returns:

None

Raises:

utils.LagoUserException – If a malformed path was detected

lago.utils.func_vector(target, args_sequence)

lago.utils.get_hash(file_path, checksum='sha1')

Generate a hash for the given file

Parameters:

• file_path (str) – Path to the file to generate the hash for
• checksum (str) – hash to apply, one of the supported by hashlib, for example sha1 or sha512

Returns:

hash for that file

Return type:

str

lago.utils.get_qemu_info(path, backing_chain=False, fail_on_error=True)

Get info on a given qemu disk

Parameters:

• path (str) – Path to the required disk
• backing_chain (boo) – if true, include also info about
• image predecessors. (the) –

Returns:

if backing_chain == True then a list of dicts else a dict

Return type:

object

lago.utils.in_prefix(prefix_class, workdir_class)

lago.utils.invoke_different_funcs_in_parallel(*funcs)

lago.utils.invoke_in_parallel(func, *args_sequences)

lago.utils.ipv4_to_mac(ip)

lago.utils.json_dump(obj, f)

lago.utils.load_virt_stream(virt_fd)

Loads the given conf stream into a dict, trying different formats if needed

Parameters:virt_fd (str) – file like objcect with the virt config to load Returns:Loaded virt config Return type:dict

lago.utils.qemu_rebase(target, backing_file, safe=True, fail_on_error=True)

changes the backing file of ‘source’ to ‘backing_file’ If backing_file is specified as “” (the empty string), then the image is rebased onto no backing file (i.e. it will exist independently of any backing file). (Taken from qemu-img man page)

Parameters:

• target (str) – Path to the source disk
• backing_file (str) – path to the base disk
• safe (bool) – if false, allow unsafe rebase (check qemu-img docs for more info)

lago.utils.read_nonblocking(file_descriptor)

lago.utils.rotate_dir(base_dir)

lago.utils.run_command(command, input_data=None, out_pipe=-1, err_pipe=-1, env=None, **kwargs)

Runs a command non-interactively

Parameters:

• command (list of str) – args of the command to execute, including the command itself as command[0] as [‘ls’, ‘-l’]
• input_data (str) – If passed, will feed that data to the subprocess through stdin
• out_pipe (int or file) – File descriptor as passed to :ref:subprocess.Popen to use as stdout
• err_pipe (int or file) – File descriptor as passed to :ref:subprocess.Popen to use as stderr
• of str (env(dict) – str): If set, will use the given dict as env for the subprocess
• **kwargs – Any other keyword args passed will be passed to the :ref:subprocess.Popen call

Returns:

result of the interactive execution

Return type:

lago.utils.CommandStatus

lago.utils.run_command_with_validation(cmd, fail_on_error=True, msg='An error has occurred')

lago.utils.run_interactive_command(command, env=None, **kwargs)

Runs a command interactively, reusing the current stdin, stdout and stderr

Parameters:

• command (list of str) – args of the command to execute, including the command itself as command[0] as [‘ls’, ‘-l’]
• of str (env(dict) – str): If set, will use the given dict as env for the subprocess
• **kwargs – Any other keyword args passed will be passed to the :ref:subprocess.Popen call

Returns:

result of the interactive execution

Return type:

lago.utils.CommandStatus

lago.utils.service_is_enabled(name)

lago.utils.sparse(input_file, input_format, fail_on_error=True)

lago.utils.ver_cmp(ver1, ver2)

Compare lago versions

Parameters:

• ver1 (str) – version string
• ver2 (str) – version string

Returns:

Return negative if ver1<ver2, zero if ver1==ver2, positive if ver1>ver2.

lago.utils.with_logging(func)

lago.virt module

class lago.virt.VirtEnv(prefix, vm_specs, net_specs)

Bases: object

Env properties: * prefix * vms * net

• libvirt_con

_create_net(net_spec)

_create_vm(vm_spec)

_get_stop_shutdown_common_args(vm_names)

Get the common arguments for stop and shutdown commands

Parameters:vm_names (list of str) – The names of the requested vms

Returns

list of plugins.vm.VMProviderPlugin:

vms objects that should be stopped

list of virt.Network: net objects that should be stopped str: log message

Raises:utils.LagoUserException – If a vm name doesn’t exist

_get_unused_nets(vms_to_stop)

Return a list of nets that used only by the vms in vms_to_stop

Parameters:vms_to_stop (list of str) – The names of the requested vms

Returns

list of virt.Network: net objects that used only by

vms in vms_to_stop

Raises:utils.LagoUserException – If a vm name doesn’t exist

bootstrap()

create_snapshots(*args, **kwargs)

export_vms(vms_names, standalone, dst_dir, compress, init_file_name, out_format)

classmethod from_prefix(prefix)

generate_init(dst, out_format, filters=None)

Generate an init file which represents this env and can be used with the images created by self.export_vms

Parameters:

• dst (str) – path and name of the new init file
• out_format (plugins.output.OutFormatPlugin) – formatter for the output (the default is yaml)
• filters (list) – list of paths to keys that should be removed from the init file

Returns:

None

get_compat()

Get compatibility level for this environment - which is the Lago version used to create this environment

get_env_spec(filters=None)

Get the spec of the current env. The spec will hold the info about all the domains and networks associated with this env.

Parameters:filters (list) – list of paths to keys that should be removed from the init file Returns:the spec of the current env Return type:dict

get_net(name=None)

get_nets()

get_snapshots(domains=None)

Get the list of snapshots for each domain

Parameters:

• domanins (list of str) – list of the domains to get the snapshots
• all will be returned if none or empty list passed (for,) –

Returns:

with the domain names and the list of snapshots for each

Return type:

dict of str -> list(str)

get_vm(name)

get_vms(vm_names=None)

Returns the vm objects associated with vm_names if vm_names is None, return all the vms in the prefix

Parameters:vm_names (list of str) – The names of the requested vms

Returns

dict: Which contains the requested vm objects indexed by name

Raises:utils.LagoUserException – If a vm name doesn’t exist

prefixed_name(unprefixed_name, max_length=0)

Returns a uuid pefixed identifier

Parameters:

• unprefixed_name (str) – Name to add a prefix to
• max_length (int) – maximum length of the resultant prefixed name, will adapt the given name and the length of the uuid ot fit it

Returns:

prefixed identifier for the given unprefixed name

Return type:

str

revert_snapshots(*args, **kwargs)

save(*args, **kwargs)

shutdown(vm_names, reboot=False)

start(vm_names=None)

stop(vm_names=None)

virt_path(*args)

lago.virt._gen_ssh_command_id()

lago.virt._guestfs_copy_path(g, guest_path, host_path)

lago.virt._path_to_xml(basename)

lago.vm module

class lago.vm.DefaultVM(env, spec)

Bases: lago.plugins.vm.VMPlugin

_abc_cache = <_weakrefset.WeakSet object>

_abc_negative_cache = <_weakrefset.WeakSet object>

_abc_negative_cache_version = 29

_abc_registry = <_weakrefset.WeakSet object>

class lago.vm.SSHVMProvider(vm)

Bases: lago.plugins.vm.VMProviderPlugin

bootstrap(*args, **kwargs)

create_snapshot(name, *args, **kwargs)

defined(*args, **kwargs)

revert_snapshot(name, *args, **kwargs)

start(*args, **kwargs)

state(*args, **kwargs)

stop(*args, **kwargs)

lago.workdir module

A workdir is the base directory where lago will store all the files it needs and that are unique (not shared between workdirs).

It’s basic structure is a directory with one soft link and multiple directories, one per prefix. Where the link points to the default prefix to use.

exception lago.workdir.MalformedWorkdir

Bases: lago.workdir.WorkdirError

exception lago.workdir.PrefixAlreadyExists

Bases: lago.workdir.WorkdirError

exception lago.workdir.PrefixNotFound

Bases: lago.workdir.WorkdirError

class lago.workdir.Workdir(path, prefix_class=<class 'lago.prefix.Prefix'>)

Bases: object

This class reperesents a base workdir, where you can store multiple prefixes

Properties:

path(str): Path to the workdir perfixes(dict of str->self.prefix_class): dict with the prefixes in the workdir, by name current(str): Name of the current prefix prefix_class(type): Class to use when creating prefixes

_set_current(new_current)

Change the current default prefix, for internal usage

Parameters:new_current (str) – Name of the new current prefix, it must already exist Returns:None Raises:PrefixNotFound – if the given prefix name does not exist in the workdir

_update_current()

Makes sure that a current is set

add_prefix(workdir, *args, **kwargs)

Adds a new prefix to the workdir.

Parameters:

• name (str) – Name of the new prefix to add
• *args – args to pass along to the prefix constructor
• *kwargs – kwargs to pass along to the prefix constructor

Returns:

The newly created prefix

Raises:

PrefixAlreadyExists – if the prefix name already exists in the workdir

cleanup()

Attempt to set a new current symlink if it is broken. If no other prefixes exist and the workdir is empty, try to delete the entire workdir.

Raises:MalformedWorkdir – if no prefixes were found, but the workdir is not empty.

destroy(workdir, *args, **kwargs)

Destroy all the given prefixes and remove any left files if no more prefixes are left

Parameters:

• prefix_names (list of str) – list of prefix names to destroy, if None
• passed (default) –

get_prefix(workdir, *args, **kwargs)

Retrieve a prefix, resolving the current one if needed

Parameters:name (str) – name of the prefix to retrieve, or current to get the current one Returns:instance of the prefix with the given name Return type:self.prefix_class

initialize(prefix_name='default', *args, **kwargs)

Initializes a workdir by adding a new prefix to the workdir.

Parameters:

• prefix_name (str) – Name of the new prefix to add
• *args – args to pass along to the prefix constructor
• *kwargs – kwargs to pass along to the prefix constructor

Returns:

The newly created prefix

Raises:

PrefixAlreadyExists – if the prefix name already exists in the workdir

static is_possible_workdir(path)

A quick method to suggest if the path is a possible workdir. This does not guarantee that the workdir is not malformed, only that by simple heuristics it might be one. For a full check use is_workdir().

Parameters:path (str) – Path Returns:True if path might be a work dir. Return type:bool

classmethod is_workdir(path)

Check if the given path is a workdir

Parameters:path (str) – Path to check Returns:True if the given path is a workdir Return type:bool

join(*args)

Gets a joined path prefixed with the workdir path

Parameters:*args (str) – path sections to join Returns:Joined path prefixed with the workdir path Return type:str

load()

Loads the prefixes that are available is the workdir

Returns:None Raises:MalformedWorkdir – if the wordir is malformed

classmethod resolve_workdir_path(start_path='.')

Look for an existing workdir in the given path, in a path/.lago dir, or in a .lago dir under any of it’s parent directories

Parameters:start_path (str) – path to start the search from, if None passed, it will use the current dir Returns:path to the found prefix Return type:str Raises:LagoUserException – if no prefix was found

set_current(workdir, *args, **kwargs)

Change the current default prefix

Parameters:new_current (str) – Name of the new current prefix, it must already exist Returns:None Raises:PrefixNotFound – if the given prefix name does not exist in the workdir

exception lago.workdir.WorkdirError

Bases: exceptions.RuntimeError

Base exception for workdir errors, catch this one to catch any workdir error

lago.workdir.workdir_loaded(func)

Decorator to make sure that the workdir is loaded when calling the decorated function

lago_template_repo package

class lago_template_repo.TemplateRepoCLI

Bases: lago.plugins.cli.CLIPlugin

_abc_cache = <_weakrefset.WeakSet object>

_abc_negative_cache = <_weakrefset.WeakSet object>

_abc_negative_cache_version = 29

_abc_registry = <_weakrefset.WeakSet object>

do_run(args)

init_args = {'help': 'Utility for system testing template management'}

populate_parser(parser)

class lago_template_repo.Verbs

ADD = 'add'

UPDATE = 'update'

lago_template_repo.do_add(args)

lago_template_repo.do_update(args)

ovirtlago package

Submodules

ovirtlago.cmd module

class ovirtlago.cmd.OvirtCLI

Bases: lago.plugins.cli.CLIPlugin

_abc_cache = <_weakrefset.WeakSet object>

_abc_negative_cache = <_weakrefset.WeakSet object>

_abc_negative_cache_version = 29

_abc_registry = <_weakrefset.WeakSet object>

do_run(args)

init_args = {'help': 'oVirt related actions'}

populate_parser(parser)

ovirtlago.cmd._populate_parser(cli_plugins, parser)

ovirtlago.constants module

ovirtlago.paths module

class ovirtlago.paths.OvirtPaths(prefix)

Bases: lago.paths.Paths

build_dir(*path)

internal_repo(*path)

test_logs(*args)

ovirtlago.prefix module

class ovirtlago.prefix.OvirtPrefix(*args, **kwargs)

Bases: lago.prefix.Prefix

VIRT_ENV_CLASS

alias of OvirtVirtEnv

_create_rpm_repository(dists, repos_path, repo_names, repoman_config, custom_sources=None, projects_list=None)

_create_virt_env()

deploy(*args, **kwargs)

prepare_repo(*args, **kwargs)

run_test(*args, **kwargs)

serve(*args, **kwargs)

class ovirtlago.prefix.OvirtWorkdir(*args, **kwargs)

Bases: lago.workdir.Workdir

ovirtlago.reposetup module

exception ovirtlago.reposetup.RepositoryError

Bases: exceptions.Exception

exception ovirtlago.reposetup.RepositoryMergeError

Bases: ovirtlago.reposetup.RepositoryError

ovirtlago.reposetup._fix_reposync_issues(reposync_out, repo_path)

Fix for the issue described at::

https://bugzilla.redhat.com//show_bug.cgi?id=1399235 https://bugzilla.redhat.com//show_bug.cgi?id=1332441

ovirtlago.reposetup.merge(output_dir, sources, repoman_config=None)

Run repoman on sources, creating a new RPM repository in output_dir

Parameters:

• output_dir (str) – Path to create new repository
• sources (list of str) – repoman sources
• repoman_config (str) –

  repoman configuration file, if not passed it will use default repoman configurations, equivalent to:

  [main]

  on_empty_source=warn

  [store.RPMStore]

  on_wrong_distro=copy_to_all

  with_srcrpms=false

  with_sources=false

Raises:

• RepositoryMergeError – If repoman command failed.
• IOError – If repoman_config is passed but does not exists.

Returns:

None

ovirtlago.reposetup.sync_rpm_repository(repo_path, yum_config, repos)

ovirtlago.reposetup.with_repo_server(func)

ovirtlago.testlib module

class ovirtlago.testlib.LogCollectorPlugin(prefix)

Bases: nose.plugins.base.Plugin

_addFault(test, err)

addError(test, err)

addFailure(test, err)

configure(options, conf)

name = 'log-collector-plugin'

options(parser, env=None)

class ovirtlago.testlib.TaskLogNosePlugin(*args, **kwargs)

Bases: nose.plugins.base.Plugin

addError(test, err)

configure(options, conf)

name = 'tasklog-plugin'

options(parser, env)

score = 10000

startTest(test)

stopTest(test)

ovirtlago.testlib._instance_of_any(obj, cls_list)

ovirtlago.testlib._vms_capable(vms, caps)

ovirtlago.testlib.assert_equals_within(func, value, timeout, allowed_exceptions=None)

ovirtlago.testlib.assert_equals_within_long(func, value, allowed_exceptions=None)

ovirtlago.testlib.assert_equals_within_short(func, value, allowed_exceptions=None)

ovirtlago.testlib.assert_true_within(func, timeout, allowed_exceptions=None)

ovirtlago.testlib.assert_true_within_long(func, allowed_exceptions=None)

ovirtlago.testlib.assert_true_within_short(func, allowed_exceptions=None)

ovirtlago.testlib.engine_capability(caps)

ovirtlago.testlib.get_prefixed_name(entity_name)

ovirtlago.testlib.get_test_prefix()

ovirtlago.testlib.host_capability(caps)

ovirtlago.testlib.test_sequence_gen(test_list)

ovirtlago.testlib.with_ovirt_api(func)

ovirtlago.testlib.with_ovirt_api4(func)

ovirtlago.testlib.with_ovirt_prefix(func)

ovirtlago.utils module

ovirtlago.utils._create_http_server(listen_ip, listen_port, root_dir)

Starts an http server with an improved request handler

Parameters:

• listen_ip (str) – Ip to listen on
• port (int) – Port to register on
• root_dir (str) – path to the directory to serve

Returns:

instance of the http server, already running on a

thread

Return type:

BaseHTTPServer

ovirtlago.utils.available_sdks(modules={'requests.Cookie': None, 'pygments.formatters.latex': <module 'pygments.formatters.latex' from '/home/docs/checkouts/readthedocs.org/user_builds/lago/envs/0.38/local/lib/python2.7/site-packages/pygments/formatters/latex.pyc'>, 'jinja2.collections': None, 'sphinx.writers.warnings': None, 'distutils.sysconfig': <module 'distutils.sysconfig' from '/usr/lib/python2.7/distutils/sysconfig.pyc'>, 'pygments.filters': <module 'pygments.filters' from '/home/docs/checkouts/readthedocs.org/user_builds/lago/envs/0.38/local/lib/python2.7/site-packages/pygments/filters/__init__.pyc'>, 'logging.weakref': None, 'sphinx.util.json': None, 'docutils.utils.warnings': None, 'pprint': <module 'pprint' from '/usr/lib/python2.7/pprint.pyc'>, 'unittest.sys': None, 'SocketServer': <module 'SocketServer' from '/usr/lib/python2.7/SocketServer.pyc'>, 'xml.etree.sys': None, 'requests.packages.urllib3.util.wait': <module 'requests.packages.urllib3.util.wait' from '/home/docs/checkouts/readthedocs.org/user_builds/lago/envs/0.38/local/lib/python2.7/site-packages/requests/packages/urllib3/util/wait.pyc'>, 'distutils.filelist': <module 'distutils.filelist' from '/usr/lib/python2.7/distutils/filelist.pyc'>, 'nose.plugins.optparse': None, 'docutils.writers.urllib': None, 'cmd': <module 'cmd' from '/usr/lib/python2.7/cmd.pyc'>, 'shlex': <module 'shlex' from '/usr/lib/python2.7/shlex.pyc'>, 'sphinx.shutil': None, 'babel.messages.__future__': None, 'babel.messages.array': None, 'babel.cStringIO': None, 'pkg_resources._vendor.pprint': None, 'nose.plugins.multiprocessing': None, 'pygments.styles.pygments': None, 'backports.configparser.helpers': <module 'backports.configparser.helpers' from '/home/docs/checkouts/readthedocs.org/user_builds/lago/envs/0.38/local/lib/python2.7/site-packages/backports/configparser/helpers.pyc'>, 'sphinx.writers.xml': <module 'sphinx.writers.xml' from '/home/docs/checkouts/readthedocs.org/user_builds/lago/envs/0.38/local/lib/python2.7/site-packages/sphinx/writers/xml.pyc'>, 'jinja2.errno': None, 'ovirtlago.re': None, 'babel.messages': <module 'babel.messages' from '/home/docs/checkouts/readthedocs.org/user_builds/lago/envs/0.38/local/lib/python2.7/site-packages/babel/messages/__init__.pyc'>, 'pkg_resources.extern.appdirs': <module 'pkg_resources._vendor.appdirs' from '/home/docs/checkouts/readthedocs.org/user_builds/lago/envs/0.38/local/lib/python2.7/site-packages/pkg_resources/_vendor/appdirs.pyc'>, 'lago.plugins.stevedore': None, 'lago.cmd': <module 'lago.cmd' from '/home/docs/checkouts/readthedocs.org/user_builds/lago/checkouts/0.38/lago/cmd.pyc'>, 'lago.log_utils': <module 'lago.log_utils' from '/home/docs/checkouts/readthedocs.org/user_builds/lago/checkouts/0.38/lago/log_utils.pyc'>, 'UserList': <module 'UserList' from '/usr/lib/python2.7/UserList.pyc'>, 'docutils.writers.docutils': None, 'new': <module 'new' from '/usr/lib/python2.7/new.pyc'>, 'nose.plugins.re': None, 'readthedocs_ext.readthedocs': <module 'readthedocs_ext.readthedocs' from '/home/docs/checkouts/readthedocs.org/user_builds/lago/envs/0.38/local/lib/python2.7/site-packages/readthedocs_ext/readthedocs.pyc'>, 'jinja2.markupsafe': None, 'lago.providers.libvirt.xmltodict': None, 'lago.utils': <module 'lago.utils' from '/home/docs/checkouts/readthedocs.org/user_builds/lago/checkouts/0.38/lago/utils.pyc'>, 'babel.localtime.datetime': None, 'codecs': <module 'codecs' from '/home/docs/checkouts/readthedocs.org/user_builds/lago/envs/0.38/lib/python2.7/codecs.pyc'>, 'setuptools.dist': <module 'setuptools.dist' from '/home/docs/checkouts/readthedocs.org/user_builds/lago/envs/0.38/local/lib/python2.7/site-packages/setuptools/dist.pyc'>, 'jinja2.lexer': <module 'jinja2.lexer' from '/home/docs/checkouts/readthedocs.org/user_builds/lago/envs/0.38/local/lib/python2.7/site-packages/jinja2/lexer.pyc'>, 'docutils.parsers.rst.languages.sys': None, 'docutils.utils.math.docutils': None, 'pygments.filters.pygments': None, 'sphinx.pycode.pgen2.re': None, 'requests.packages.urllib3.util.retry': <module 'requests.packages.urllib3.util.retry' from '/home/docs/checkouts/readthedocs.org/user_builds/lago/envs/0.38/local/lib/python2.7/site-packages/requests/packages/urllib3/util/retry.pyc'>, 'distutils.sys': None, 'nose.tools.nontrivial': <module 'nose.tools.nontrivial' from '/home/docs/checkouts/readthedocs.org/user_builds/lago/envs/0.38/local/lib/python2.7/site-packages/nose/tools/nontrivial.pyc'>, 'json.decoder': <module 'json.decoder' from '/usr/lib/python2.7/json/decoder.pyc'>, 'sphinx.writers.html': <module 'sphinx.writers.html' from '/home/docs/checkouts/readthedocs.org/user_builds/lago/envs/0.38/local/lib/python2.7/site-packages/sphinx/writers/html.pyc'>, 'sphinx.builders.subprocess': None, 'docutils.codecs': None, 'sphinx.pycode.__future__': None, 'pkg_resources._vendor.datetime': None, 'pygments.lexers.css': <module 'pygments.lexers.css' from '/home/docs/checkouts/readthedocs.org/user_builds/lago/envs/0.38/local/lib/python2.7/site-packages/pygments/lexers/css.pyc'>, 'ctypes._ctypes': None, '_heapq': <module '_heapq' (built-in)>, 'sphinx.ext.napoleon.sphinx': None, 'requests.packages.urllib3.util': <module 'requests.packages.urllib3.util' from '/home/docs/checkouts/readthedocs.org/user_builds/lago/envs/0.38/local/lib/python2.7/site-packages/requests/packages/urllib3/util/__init__.pyc'>, 'email.sys': None, 'tokenize': <module 'tokenize' from '/usr/lib/python2.7/tokenize.pyc'>, 'cPickle': <module 'cPickle' (built-in)>, 'markupsafe.re': None, 'jinja2.tempfile': None, 'sphinx.environment.managers.docutils': None, 'docutils.utils.math': <module 'docutils.utils.math' from '/home/docs/checkouts/readthedocs.org/user_builds/lago/envs/0.38/local/lib/python2.7/site-packages/docutils/utils/math/__init__.pyc'>, 'sphinx.builders.os': None, 'sphinx.builders.devhelp': <module 'sphinx.builders.devhelp' from '/home/docs/checkouts/readthedocs.org/user_builds/lago/envs/0.38/local/lib/python2.7/site-packages/sphinx/builders/devhelp.pyc'>, 'setup': <module 'setup' from '/home/docs/checkouts/readthedocs.org/user_builds/lago/checkouts/0.38/setup.pyc'>, 'pkg_resources._vendor.copy': None, 'fnmatch': <module 'fnmatch' from '/home/docs/checkouts/readthedocs.org/user_builds/lago/envs/0.38/lib/python2.7/fnmatch.pyc'>, 'pygments.regexopt': <module 'pygments.regexopt' from '/home/docs/checkouts/readthedocs.org/user_builds/lago/envs/0.38/local/lib/python2.7/site-packages/pygments/regexopt.pyc'>, 'logging.cStringIO': None, 'sphinx.domains.c': <module 'sphinx.domains.c' from '/home/docs/checkouts/readthedocs.org/user_builds/lago/envs/0.38/local/lib/python2.7/site-packages/sphinx/domains/c.pyc'>, 'lago.plugins.contextlib': None, 'nose.pyversion': <module 'nose.pyversion' from '/home/docs/checkouts/readthedocs.org/user_builds/lago/envs/0.38/local/lib/python2.7/site-packages/nose/pyversion.pyc'>, 'xml.sax.xml': None, 'email.message': <module 'email.message' from '/usr/lib/python2.7/email/message.pyc'>, 'strop': <module 'strop' (built-in)>, 'sphinx.builders.shlex': None, 'six.moves.html_parser': <module 'HTMLParser' from '/usr/lib/python2.7/HTMLParser.pyc'>, 'ovirtlago.yaml': None, 'lago.argparse': None, 'sphinx.re': None, 'sphinx.util.stemmer': <module 'sphinx.util.stemmer' from '/home/docs/checkouts/readthedocs.org/user_builds/lago/envs/0.38/local/lib/python2.7/site-packages/sphinx/util/stemmer.pyc'>, 'sphinx.pycode.sphinx': None, 'os.path': <module 'posixpath' from '/home/docs/checkouts/readthedocs.org/user_builds/lago/envs/0.38/lib/python2.7/posixpath.pyc'>, 'email.base64mime': <module 'email.base64mime' from '/usr/lib/python2.7/email/base64mime.pyc'>, 'requests.packages.urllib3.util.request': <module 'requests.packages.urllib3.util.request' from 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ovirtlago.utils.generate_request_handler(root_dir)

Factory for _BetterHTTPRequestHandler classes

Parameters:root_dir (path) – Path to the dir to serve Returns:

A ready to be used improved http request

handler

Return type:_BetterHTTPRequestHandler

ovirtlago.utils.get_data_file(basename)

Load a data as a string from the data directory

Parameters:basename (str) – filename Returns:string representation of the file Return type:str

ovirtlago.utils.partial(func, *args, **kwargs)

ovirtlago.utils.repo_server_context(*args, **kwds)

Context manager that starts an http server that serves the given prefix’s yum repository. Will listen on constants.REPO_SERVER_PORT and on the first network defined in the previx virt config

Parameters:prefix (ovirtlago.prefix.OvirtPrefix) – prefix to start the server for Returns:None

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ovirtlago.virt module

class ovirtlago.virt.EngineVM(*args, **kwargs)

Bases: lago.vm.DefaultVM

_abc_cache = <_weakrefset.WeakSet object>

_abc_negative_cache = <_weakrefset.WeakSet object>

_abc_negative_cache_version = 29

_abc_registry = <_weakrefset.WeakSet object>

_artifact_paths()

_create_api(api_ver)

_get_api(api_ver)

_search_vms(*args, **kwargs)

add_iso(path)

check_sds_status(*args, **kwargs)

engine_setup(config=None)

get_api(api_ver=3)

get_api_v3()

get_api_v4(check=False)

start_all_hosts(*args, **kwargs)

start_all_vms(*args, **kwargs)

status(*args, **kwargs)

stop()

stop_all_hosts(*args, **kwargs)

stop_all_vms(*args, **kwargs)

class ovirtlago.virt.HEHostVM(env, spec)

Bases: ovirtlago.virt.HostVM

_abc_cache = <_weakrefset.WeakSet object>

_abc_negative_cache = <_weakrefset.WeakSet object>

_abc_negative_cache_version = 29

_abc_registry = <_weakrefset.WeakSet object>

_artifact_paths()

class ovirtlago.virt.HostVM(env, spec)

Bases: lago.vm.DefaultVM

_abc_cache = <_weakrefset.WeakSet object>

_abc_negative_cache = <_weakrefset.WeakSet object>

_abc_negative_cache_version = 29

_abc_registry = <_weakrefset.WeakSet object>

_artifact_paths()

class ovirtlago.virt.NodeVM(env, spec)

Bases: lago.vm.DefaultVM

_abc_cache = <_weakrefset.WeakSet object>

_abc_negative_cache = <_weakrefset.WeakSet object>

_abc_negative_cache_version = 29

_abc_registry = <_weakrefset.WeakSet object>

_artifact_paths()

wait_for_ssh()

class ovirtlago.virt.OvirtVirtEnv(prefix, vm_specs, net_spec)

Bases: lago.virt.VirtEnv

_create_vm(vm_spec)

assert_engine_alive(timeout=120)

Assert service ‘ovirt-engine’ reports running on the engine VM

Parameters:timeout (int) – timeout Returns:None Raises:AssertionError – if ovirt-engine is not reported running after the given timeout, or ssh is unreachable.

assert_vdsm_alive(timeout=120)

Assert service ‘vdsmd’ reports running on all vdsm hosts

Parameters:timeout (int) – timeout Returns:None Raises:AssertionError – if vdsmd is not reported running after the given timeout, or ssh is unreachable.

engine_vm()

get_ovirt_cpu_family(host=None)

Get a suitable string for oVirt Cluster CPU. If host is None, it will use a random host, if no hosts are available it will use the Engine VM for detection. The detection is done by getting the VM host CPU model and vendor, from Lago, which in its turn is based on what was configured in the LagoInitFile. The detected model and vendor are then compared against the definitions in data/ovirt-cpu-map.yaml or against a custom file, if ovirt-cpu-map parameter was defined in the host’s metadata section.

Parameters:host (lago.vm.DefaultVM) – VM CPU/vendor to use for detection Returns:oVirt CPU Cluster string Return type:str Raises:RuntimeError – If unsupported cpu vendor or model is detected

host_vms()

Releases

Release process

Versioning

For lago we use a similar approach to semantic versioning, that is:

X.Y.Z

For example:

0.1.0
1.2.123
2.0.0
2.0.1

Where:

• Z changes for each patch (number of patches since X.Y tag)
• Y changes from time to time, with milestones (arbitrary bump), only for backwards compatible changes
• X changes if it’s a non-backwards compatible change or arbitrarily (we don’t like Y getting too high, or big milestone reached, ...)

The source tree has tags with the X.Y versions, that’s where the packaging process gets them from.

On each X or Y change a new tag is created.

For now we have only one branch (master) and we will try to keep it that way as long as possible, if at some point we have to support old versions, then we will create a branch for each X version in the form:

vX

For example:

v0
v1

There’s a helper script to resolve the current version, based on the last tag and the compatibility breaking commits since then, to get the version for the current repo run:

$ scripts/version_manager.py . version

RPM Versioning

The rpm versions differ from the generic version in that they have the -1 suffix, where the -1 is the release for that rpm (usually will never change, only when repackaging without any code change, something that is not so easy for us but if there’s any external packagers is helpful for them)

Repository layout

Tree schema of the repository:

lago
├── stable <-- subdirs for each major version to avoid accidental
│   │          non-backwards compatible ugrade
│   │
│   ├── 0.0  <-- Contains any 0.* release for lago
│   │   ├── ChangeLog_0.0.txt
│   │   ├── rpm
│   │   │   ├── el6
│   │   │   ├── el7
│   │   │   ├── fc22
│   │   │   └── fc23
│   │   └── sources
│   ├── 1.0
│   │   ├── ChangeLog_1.0.txt
│   │   ├── rpm
│   │   │   ├── el6
│   │   │   ├── el7
│   │   │   ├── fc22
│   │   │   └── fc23
│   │   └── sources
│   └── 2.0
│       ├── ChangeLog_2.0.txt
│       ├── rpm
│       │   ├── el6
│       │   ├── el7
│       │   ├── fc22
│       │   └── fc23
│       └── sources
└── unstable <-- Multiple subdirs are needed only if branching
    ├── 0.0  <-- Contains 0.* builds that might or might not have
    │   │        been released
    │   ├── latest  <--- keeps the latest build from merged, static
    │   │                url
    │   ├── snapshot-lago_0.0_pipeline_1
    │   ├── snapshot-lago_0.0_pipeline_2
    │   │         ^ contains the rpms created on the pipeline build
    │   │           number 2 for the 0.0 version, this is needed to
    │   │           ease the automated testing of the rpms
    │   │
    │   └── ... <-- this is cleaned up from time to time to avoid
    │               using too much space
    ├── 1.0
    │   ├── latest
    │   ├── snapshot-lago_1.0_pipeline_1
    │   ├── snapshot-lago_pipeline_2
    │   └── ...
    └── 2.0
        ├── latest
        ├── snapshot-lago_2.0_pipeline_1
        ├── snapshot-lago_2.0_pipeline_2
        └── ...

Promotion of artifacts to stable, aka. releasing

The goal is to have an automated set of tests, that check in depth lago, and run them in a timely fashion, and if passed, deploy to stable. As right now that’s not yet possible, so for now the tests and deploy is done manually.

The promotion of the artifacts is done in these cases:

• New major version bump (X+1.0, for example 1.0 -> 2.0)
• New minor version bump (X.Y+1, for exampyre 1.1 -> 1.2)
• If it passed certain time since the last X or Y version bumps (X.Y.Z+n, for example 1.0.1 -> 1.0.2)
• If there are blocking/important bugfixes (X.Y.Z+n)
• If there are important new features (X.Y+1 or X.Y.Z+n)

How to mark a major version

Whenever there’s a commit that breaks the backwards compatibility, you should add to it the pseudo-header:

Sem-Ver: api-breaking

And that will force a major version bump for any package built from it, that is done so in the moment when you submit the commit in gerrit, the packages that are build from it have the correct version.

After that, make sure that you tag that commit too, so it will be easy to look for it in the future.

The release procedure on the maintainer side

1. Select the snapshot repo you want to release

2. Test the rpms, for now we only have the tests from projects that use it:

   • Run all the ovirt tests on it, make sure it does not break anything, if there are issues -> open bug

   • Run vdsm functional tests, make sure it does not break anything, if

     there are issues -> open bug

3. On non-major version bump X.Y+1 or X.Y.Z+n

   • Create a changelog since the base of the tag and keep it aside

4. On Major version bump X+1.0

   • Create a changelog since the previous .0 tag (X.0) and keep

     it aside

5. Deploy the rpms from snapshot to dest repo and copy the ChangeLog from the tarball to ChangeLog_X.0.txt in the base of the stable/X.0/ dir

6. Send email to lago-devel with the announcement and the changelog since the previous tag that you kept aside, feel free to change the body to your liking:

   Subject: [day-month-year] New lago release - X.Y.Z
   
   Hi everyone! There's a new lago release with version X.Y.Z ready for you to
   upgrade!
   
   Here are the changes:
       <CHANGELOG HERE>
   
   Enjoy!
   

Changelog

Here you can find the full changelog for this version

Indices and tables

• Index
• Module Index
• Search Page