Job Content

Zuul jobs are implemented as Ansible playbooks. Zuul prepares the repositories used for a job, installs any required Ansible roles, and then executes the job’s playbooks. Any setup or artifact collection required is the responsibility of the job itself. While this flexible arrangement allows for almost any kind of job to be run by Zuul, batteries are included. Zuul has a standard library of jobs upon which to build.

Working Directory

Before starting each job, the Zuul executor creates a directory to hold all of the content related to the job. This includes some directories which are used by Zuul to configure and run Ansible and may not be accessible, as well as a directory tree, under work/, that is readable and writable by the job. The hierarchy is:

work/

The working directory of the job.

work/src/

Contains the prepared git repositories for the job.

work/logs/

Where the Ansible log for the job is written; your job may place other logs here as well.

Git Repositories

The git repositories in work/src contain the repositories for all of the projects specified in the required-projects section of the job, plus the project associated with the queue item if it isn’t already in that list. In the case of a proposed change, that change and all of the changes ahead of it in the pipeline queue will already be merged into their respective repositories and target branches. The change’s project will have the change’s branch checked out, as will all of the other projects, if that branch exists (otherwise, a fallback or default branch will be used). If your job needs to operate on multiple branches, simply checkout the appropriate branches of these git repos to ensure that the job results reflect the proposed future state that Zuul is testing, and all dependencies are present.

The git repositories will have a remote origin with refs pointing to the previous change in the speculative state. This means that e.g. a git diff origin/<branch>..<branch> will show the changes being tested. Note that the origin URL is set to a bogus value (file:///dev/null) and can not be used for updating the repository state; the local repositories are guaranteed to be up to date.

The repositories will be placed on the filesystem in directories corresponding with the canonical hostname of their source connection. For example:

work/src/git.example.com/project1
work/src/github.com/project2

Is the layout that would be present for a job which included project1 from the connection associated to git.example.com and project2 from GitHub. This helps avoid collisions between projects with the same name, and some language environments, such as Go, expect repositories in this format.

Note that these git repositories are located on the executor; in order to be useful to most kinds of jobs, they will need to be present on the test nodes. The base job in the standard library (see zuul-base-jobs documentation for details) contains a pre-playbook which copies the repositories to all of the job’s nodes. It is recommended to always inherit from this base job to ensure that behavior.

Variables

There are several sources of variables which are available to Ansible: variables defined in jobs, secrets, and site-wide variables. The order of precedence is:

  1. Site-wide variables

  2. Job extra variables

  3. Secrets

  4. Job variables

  5. Project variables

  6. File variables

  7. Parent job results

Meaning that a site-wide variable with the same name as any other will override its value, and similarly, secrets override job variables of the same name which override data returned from parent jobs. Each of the sources is described below.

Site-wide Variables

The Zuul administrator may define variables which will be available to all jobs running in the system. These are statically defined and may not be altered by jobs. See the Administrator’s Guide for information on how a site administrator may define these variables.

Job Extra Variables

Any extra variables in the job definition (using the job.extra-vars attribute) are available to Ansible but not added into the inventory file.

Secrets

Secrets also appear as variables available to Ansible. Unlike job variables, these are not added to the inventory file (so that the inventory file may be kept for debugging purposes without revealing secrets). But they are still available to Ansible as normal variables. Because secrets are groups of variables, they will appear as a dictionary structure in templates, with the dictionary itself being the name of the secret, and its members the individual items in the secret. For example, a secret defined as:

- secret:
    name: credentials
    data:
      username: foo
      password: bar

Might be used in a template as:

{{ credentials.username }} {{ credentials.password }}

Secrets are only available to playbooks associated with the job definition which uses the secret; they are not available to playbooks associated with child jobs or job variants.

Job Variables

Any variables specified in the job definition (using the job.vars attribute) are available as Ansible host variables. They are added to the vars section of the inventory file under the all hosts group, so they are available to all hosts. Simply refer to them by the name specified in the job’s vars section.

Project Variables

Any variables specified in the project definition (using the project.vars attribute) are available to jobs as Ansible host variables in the same way as job variables. Variables set in a project-template are merged into the project variables when the template is included by a project.

- project-template:
    name: sample-template
    description: Description
    vars:
      var_from_template: foo
    post:
      jobs:
        - template_job
    release:
      jobs:
        - template_job

- project:
    name: Sample project
    description: Description
    templates:
      - sample-template
    vars:
      var_for_all_jobs: value
    check:
      jobs:
        - job1
        - job2:
            vars:
              var_for_all_jobs: override

File Variables

Any variables specified in files loaded from project repositories (using the job.include-vars attribute) are available to jobs as Ansible host variables in the same way as job variables.

Parent Job Results

A job may return data to Zuul for later use by jobs which depend on it. For details, see Return Values.

Zuul Variables

Zuul supplies not only the variables specified by the job definition to Ansible, but also some variables from Zuul itself.

When a pipeline is triggered by an action, it enqueues items which may vary based on the pipeline’s configuration. For example, when a new change is created, that change may be enqueued into the pipeline, while a tag may be enqueued into the pipeline when it is pushed.

An item typically refers to a single git reference, but in the case of a dependency cycle among changes, the item may be composed of multiple changes.

Information about these items is available to jobs. Since all of the items enqueued in a pipeline represent one or more git references, the different types of item share some attributes in common. But other attributes may vary based on the type of ref. The different types of ref are:

Change

A change to the repository. Most often, this will be a git reference which has not yet been merged into the repository (e.g., a Gerrit change or a GitHub pull request).

Branch

This represents a branch tip. This item may have been enqueued because the branch was updated (via a change having merged, or a direct push). Or it may have been enqueued by a timer for the purpose of verifying the current condition of the branch.

Tag

This represents a git tag. The item may have been enqueued because a tag was created or deleted.

Ref

This represents a git reference that is neither a change, branch, or tag.

If a build is running for a queue item with a single ref, the values below are straightforward. Things are a little more complex if the queue item represents multiple changes in a dependency cycle. In that case, the same job may be run multiple times, each for a different change in the cycle. If that happens, then many of the attributes below (such as zuul.change and zuul.project, etc) will refer to the particular change that is assigned to that build. However, if a job is deduplicated, then one build is run for several changes simultaneously. In that case, one of the changes which triggered the job will arbitrarily be selected for those values. If possible, Zuul will use the change that originally caused the item to be enqueued, but that is not always possible, and that behavior should not be relied upon.

Job Ref

The following variables related to the job’s selected ref (as described above) are available:

zuul
zuul.project

The job’s project. If the job is running for a single change, then this will be the project of that change. In the case of a circular dependency queue item where this job is run more than once for different changes in the item, this will be set to the project of the particular change assigned to this build of the job. If the job is deduplicated, then this is arbitrarily set to one of the changes in the queue item that triggered the job.

This is a data structure with the following fields:

zuul.project.name

The name of the project, excluding hostname. E.g., org/project.

zuul.project.short_name

The name of the project, excluding directories or organizations. E.g., project.

zuul.project.canonical_hostname

The canonical hostname where the project lives. E.g., git.example.com.

zuul.project.canonical_name

The full canonical name of the project including hostname. E.g., git.example.com/org/project.

zuul.project.src_dir

The path to the source code relative to the work dir. E.g., src/git.example.com/org/project.

zuul.branch

This field is present for the following item types:

Branch

The item’s branch (without the refs/heads/ prefix).

Change

The target branch of the change (without the refs/heads/ prefix).

zuul.change

This field is present for the following item type:

Change

The identifier for the change.

zuul.message

The commit or pull request message of the change base64 encoded. Use the b64decode filter in ansible when working with it.

Warning

This variable is deprecated and will be removed in a future version. Use zuul.change_message instead.

zuul.change_message

This field is present for the following item type:

Change

The commit or pull request message of the change. When Zuul runs Ansible, this variable is tagged with the !unsafe YAML tag so that Ansible will not interpolate values into it. Note, however, that the inventory.yaml file placed in the build’s workspace for debugging and inspection purposes does not inclued the !unsafe tag.

zuul.change_url

This field is present for the following item types:

Change

The URL to the source location of the given change. E.g., https://review.example.org/#/c/123456/ or https://github.com/example/example/pull/1234.

Branch

The URL to the commit browser for the branch.

Tag

The URL to the commit browser for the tag.

Ref

The URL to the commit browser for the ref.

zuul.patchset

This field is present for the following item types:

Change

The patchset identifier for the change. If a change is revised, this will have a different value.

zuul.project

The item’s project. This is a data structure with the following fields:

zuul.project.name

The name of the project, excluding hostname. E.g., org/project.

zuul.project.short_name

The name of the project, excluding directories or organizations. E.g., project.

zuul.project.canonical_hostname

The canonical hostname where the project lives. E.g., git.example.com.

zuul.project.canonical_name

The full canonical name of the project including hostname. E.g., git.example.com/org/project.

zuul.project.src_dir

The path to the source code on the remote host, relative to the home dir of the remote user. E.g., src/git.example.com/org/project.

zuul.oldrev

This field is present for the following item types:

Branch

If the item was enqueued as the result of a change merging or being pushed to the branch, the git sha of the old revision will be included here.

Tag

If the item was enqueued as the result of a tag being deleted, the previous git sha of the tag will be included here. If the tag was created, this variable will be undefined.

Ref

If the item was enqueued as the result of a ref being deleted, the previous git sha of the ref will be included here. If the ref was created, this variable will be undefined.

zuul.newrev

This field is present for the following item types:

Branch

If the item was enqueued as the result of a change merging or being pushed to the branch, the git sha of the new revision will be included here.

Tag

If the item was enqueued as the result of a tag being created, the new git sha of the tag will be included here. If the tag was deleted, this variable will be undefined.

Ref

If the item was enqueued as the result of a ref being created, the new git sha of the ref will be included here. If the ref was deleted, this variable will be undefined.

zuul.commit_id

This field is present for the following item types:

Branch

The git sha of the branch. Identical to newrev or oldrev if defined.

Tag

The git sha of the tag. Identical to newrev or oldrev if defined.

Ref

The git sha of the ref. Identical to newrev or oldrev if defined.

zuul.tag

This field is present for the following item types:

Tag

The name of the item’s tag (without the refs/tags/ prefix).

zuul.topic

This field is present for the following item types:

Change

The topic of the change (if any).

zuul.ref

The git ref of the item. This will be the full path (e.g., refs/heads/master or refs/changes/…).

Item

The following variables related to the queue item are available:

zuul
zuul.items
Type: list

Note

zuul.items conflicts with the items() builtin so the variable can only be accessed with python dictionary like syntax, e.g: zuul['items']

A list of dictionaries, each representing a ref being tested with this change.

zuul.items[].branch

This field is present for the following item types:

Branch

The item’s branch (without the refs/heads/ prefix).

Change

The target branch of the change (without the refs/heads/ prefix).

zuul.items[].bundle_id

This field is present for the following item type:

Change

The id of the bundle if the change is in a circular dependency cycle.

Only available for items with more than one change.

Warning

This variable is deprecated and will be removed in a future version. Use zuul.buildset_refs to identify if the item is for a dependency cycle and the associated changes instead.

zuul.items[].change

This field is present for the following item type:

Change

The identifier for the change.

zuul.items[].change_message

This field is present for the following item type:

Change

The commit or pull request message of the change. When Zuul runs Ansible, this variable is tagged with the !unsafe YAML tag so that Ansible will not interpolate values into it. Note, however, that the inventory.yaml file placed in the build’s workspace for debugging and inspection purposes does not inclued the !unsafe tag.

zuul.items[].change_url

This field is present for the following item types:

Change

The URL to the source location of the given change. E.g., https://review.example.org/#/c/123456/ or https://github.com/example/example/pull/1234.

Branch

The URL to the commit browser for the branch.

Tag

The URL to the commit browser for the tag.

Ref

The URL to the commit browser for the ref.

zuul.items[].patchset

This field is present for the following item types:

Change

The patchset identifier for the change. If a change is revised, this will have a different value.

zuul.items[].project

The item’s project. This is a data structure with the following fields:

zuul.items[].project.name

The name of the project, excluding hostname. E.g., org/project.

zuul.items[].project.short_name

The name of the project, excluding directories or organizations. E.g., project.

zuul.items[].project.canonical_hostname

The canonical hostname where the project lives. E.g., git.example.com.

zuul.items[].project.canonical_name

The full canonical name of the project including hostname. E.g., git.example.com/org/project.

zuul.items[].project.src_dir

The path to the source code on the remote host, relative to the home dir of the remote user. E.g., src/git.example.com/org/project.

zuul.items[].oldrev

This field is present for the following item types:

Branch

If the item was enqueued as the result of a change merging or being pushed to the branch, the git sha of the old revision will be included here.

Tag

If the item was enqueued as the result of a tag being deleted, the previous git sha of the tag will be included here. If the tag was created, this variable will be undefined.

Ref

If the item was enqueued as the result of a ref being deleted, the previous git sha of the ref will be included here. If the ref was created, this variable will be undefined.

zuul.items[].newrev

This field is present for the following item types:

Branch

If the item was enqueued as the result of a change merging or being pushed to the branch, the git sha of the new revision will be included here.

Tag

If the item was enqueued as the result of a tag being created, the new git sha of the tag will be included here. If the tag was deleted, this variable will be undefined.

Ref

If the item was enqueued as the result of a ref being created, the new git sha of the ref will be included here. If the ref was deleted, this variable will be undefined.

zuul.items[].commit_id

This field is present for the following item types:

Branch

The git sha of the branch. Identical to newrev or oldrev if defined.

Tag

The git sha of the tag. Identical to newrev or oldrev if defined.

Ref

The git sha of the ref. Identical to newrev or oldrev if defined.

zuul.items[].tag

This field is present for the following item types:

Tag

The name of the item’s tag (without the refs/tags/ prefix).

zuul.items[].topic

This field is present for the following item types:

Change

The topic of the change (if any).

zuul.build_refs
Type: list

A list of dictionaries, each representing a ref associated with this build. Normally there is only one item in this list, but if the queue item is a dependency cycle, more than one item in the cycle requested the job be run, and the job has been deduplicated, then each item for which this build is being run will be present. It is possible for a job to be deduplicated against all items in the cycle, only some of them, or none. If deduplication happens for some or none, then multiple builds of the job will be run, and this variable will indicate for which of those items this particular build applies.

zuul.build_refs[].branch

This field is present for the following item types:

Branch

The item’s branch (without the refs/heads/ prefix).

Change

The target branch of the change (without the refs/heads/ prefix).

zuul.build_refs[].change

This field is present for the following item type:

Change

The identifier for the change.

zuul.build_refs[].change_message

This field is present for the following item type:

Change

The commit or pull request message of the change. When Zuul runs Ansible, this variable is tagged with the !unsafe YAML tag so that Ansible will not interpolate values into it. Note, however, that the inventory.yaml file placed in the build’s workspace for debugging and inspection purposes does not inclued the !unsafe tag.

zuul.build_refs[].change_url

This field is present for the following item types:

Change

The URL to the source location of the given change. E.g., https://review.example.org/#/c/123456/ or https://github.com/example/example/pull/1234.

Branch

The URL to the commit browser for the branch.

Tag

The URL to the commit browser for the tag.

Ref

The URL to the commit browser for the ref.

zuul.build_refs[].patchset

This field is present for the following item types:

Change

The patchset identifier for the change. If a change is revised, this will have a different value.

zuul.build_refs[].project

The item’s project. This is a data structure with the following fields:

zuul.build_refs[].project.name

The name of the project, excluding hostname. E.g., org/project.

zuul.build_refs[].project.short_name

The name of the project, excluding directories or organizations. E.g., project.

zuul.build_refs[].project.canonical_hostname

The canonical hostname where the project lives. E.g., git.example.com.

zuul.build_refs[].project.canonical_name

The full canonical name of the project including hostname. E.g., git.example.com/org/project.

zuul.build_refs[].project.src_dir

The path to the source code on the remote host, relative to the home dir of the remote user. E.g., src/git.example.com/org/project.

zuul.build_refs[].oldrev

This field is present for the following item types:

Branch

If the item was enqueued as the result of a change merging or being pushed to the branch, the git sha of the old revision will be included here.

Tag

If the item was enqueued as the result of a tag being deleted, the previous git sha of the tag will be included here. If the tag was created, this variable will be undefined.

Ref

If the item was enqueued as the result of a ref being deleted, the previous git sha of the ref will be included here. If the ref was created, this variable will be undefined.

zuul.build_refs[].newrev

This field is present for the following item types:

Branch

If the item was enqueued as the result of a change merging or being pushed to the branch, the git sha of the new revision will be included here.

Tag

If the item was enqueued as the result of a tag being created, the new git sha of the tag will be included here. If the tag was deleted, this variable will be undefined.

Ref

If the item was enqueued as the result of a ref being created, the new git sha of the ref will be included here. If the ref was deleted, this variable will be undefined.

zuul.build_refs[].commit_id

This field is present for the following item types:

Branch

The git sha of the branch. Identical to newrev or oldrev if defined.

Tag

The git sha of the tag. Identical to newrev or oldrev if defined.

Ref

The git sha of the ref. Identical to newrev or oldrev if defined.

zuul.build_refs[].tag

This field is present for the following item types:

Tag

The name of the item’s tag (without the refs/tags/ prefix).

zuul.build_refs[].topic

This field is present for the following item types:

Change

The topic of the change (if any).

zuul.buildset_refs
Type: list

A list of dictionaries, each representing a ref associated with this queue item. Normally there is only one item in this list, but if the queue item is a dependency cycle, each change in the cycle will be present.

zuul.buildset_refs[].branch

This field is present for the following item types:

Branch

The item’s branch (without the refs/heads/ prefix).

Change

The target branch of the change (without the refs/heads/ prefix).

zuul.buildset_refs[].change

This field is present for the following item type:

Change

The identifier for the change.

zuul.buildset_refs[].change_message

This field is present for the following item type:

Change

The commit or pull request message of the change. When Zuul runs Ansible, this variable is tagged with the !unsafe YAML tag so that Ansible will not interpolate values into it. Note, however, that the inventory.yaml file placed in the build’s workspace for debugging and inspection purposes does not inclued the !unsafe tag.

zuul.buildset_refs[].change_url

This field is present for the following item types:

Change

The URL to the source location of the given change. E.g., https://review.example.org/#/c/123456/ or https://github.com/example/example/pull/1234.

Branch

The URL to the commit browser for the branch.

Tag

The URL to the commit browser for the tag.

Ref

The URL to the commit browser for the ref.

zuul.buildset_refs[].patchset

This field is present for the following item types:

Change

The patchset identifier for the change. If a change is revised, this will have a different value.

zuul.buildset_refs[].project

The item’s project. This is a data structure with the following fields:

zuul.buildset_refs[].project.name

The name of the project, excluding hostname. E.g., org/project.

zuul.buildset_refs[].project.short_name

The name of the project, excluding directories or organizations. E.g., project.

zuul.buildset_refs[].project.canonical_hostname

The canonical hostname where the project lives. E.g., git.example.com.

zuul.buildset_refs[].project.canonical_name

The full canonical name of the project including hostname. E.g., git.example.com/org/project.

zuul.buildset_refs[].project.src_dir

The path to the source code on the remote host, relative to the home dir of the remote user. E.g., src/git.example.com/org/project.

zuul.buildset_refs[].oldrev

This field is present for the following item types:

Branch

If the item was enqueued as the result of a change merging or being pushed to the branch, the git sha of the old revision will be included here.

Tag

If the item was enqueued as the result of a tag being deleted, the previous git sha of the tag will be included here. If the tag was created, this variable will be undefined.

Ref

If the item was enqueued as the result of a ref being deleted, the previous git sha of the ref will be included here. If the ref was created, this variable will be undefined.

zuul.buildset_refs[].newrev

This field is present for the following item types:

Branch

If the item was enqueued as the result of a change merging or being pushed to the branch, the git sha of the new revision will be included here.

Tag

If the item was enqueued as the result of a tag being created, the new git sha of the tag will be included here. If the tag was deleted, this variable will be undefined.

Ref

If the item was enqueued as the result of a ref being created, the new git sha of the ref will be included here. If the ref was deleted, this variable will be undefined.

zuul.buildset_refs[].commit_id

This field is present for the following item types:

Branch

The git sha of the branch. Identical to newrev or oldrev if defined.

Tag

The git sha of the tag. Identical to newrev or oldrev if defined.

Ref

The git sha of the ref. Identical to newrev or oldrev if defined.

zuul.buildset_refs[].tag

This field is present for the following item types:

Tag

The name of the item’s tag (without the refs/tags/ prefix).

zuul.buildset_refs[].topic

This field is present for the following item types:

Change

The topic of the change (if any).

Job

The following variables related to the job are available:

zuul
zuul.artifacts
Type: list

If the job has a job.requires attribute, and Zuul has found changes ahead of this change in the pipeline with matching job.provides attributes, then information about any artifacts returned from those jobs will appear here.

This value is a list of dictionaries with the following format:

zuul.artifacts[].project

The name of the project which supplied this artifact.

zuul.artifacts[].change

The change number which supplied this artifact.

zuul.artifacts[].patchset

The patchset of the change.

zuul.artifacts[].job

The name of the job which produced the artifact.

zuul.artifacts[].name

The name of the artifact (as supplied to Returning artifact URLs).

zuul.artifacts[].url

The URL of the artifact (as supplied to Returning artifact URLs).

zuul.artifacts[].metadata

The metadata of the artifact (as supplied to Returning artifact URLs).

zuul.build

The UUID of the build. A build is a single execution of a job. When an item is enqueued into a pipeline, this usually results in one build of each job triggered by that item. However, items may be re-enqueued in which case another build may run. In dependent pipelines, the same job may run multiple times for the same item as circumstances change ahead in the queue. Each time a job is run, for whatever reason, it is acompanied with a new unique id.

zuul.buildset

The buildset UUID. When Zuul runs jobs for an item, the collection of those jobs is known as a buildset. If the configuration of items ahead in a dependent pipeline changes, Zuul creates a new buildset and restarts all of the jobs.

zuul.child_jobs

A list of the first level dependent jobs to be run after this job has finished successfully.

zuul.override_checkout

If the job was configured to override the branch or tag checked out, this will contain the specified value. Otherwise, this variable will be undefined.

zuul.pipeline

The name of the pipeline in which the job is being run.

zuul.post_review
Type: bool

Whether the current job is running in a post-review pipeline or not.

zuul.job

The name of the job being run.

zuul.event_id

The UUID of the event that triggered this execution. This is mainly useful for debugging purposes.

zuul.voting

A boolean indicating whether the job is voting.

zuul.attempts

An integer count of how many attempts have been made to run this job for the current buildset. If there are pre-run failures or network connectivity issues then previous attempts may have been cancelled, and this value will be greater than 1.

zuul.max_attempts

The number of attempts that will be be made for this job when encountering an error in a pre-playbook before it is reported as failed. This value is taken from job.attempts.

zuul.ansible_version

The version of the Ansible community package release used for executing the job.

zuul.projects
Type: dict

A dictionary of all projects prepared by Zuul for the item. It includes, at least, the item’s own projects. It also includes the projects of any items this item depends on, as well as the projects that appear in job.required-projects.

This is a dictionary of dictionaries. Each value has a key of the canonical_name, then each entry consists of:

zuul.projects{}.name

The name of the project, excluding hostname. E.g., org/project.

zuul.projects{}.short_name

The name of the project, excluding directories or organizations. E.g., project.

zuul.projects{}.canonical_hostname

The canonical hostname where the project lives. E.g., git.example.com.

zuul.projects{}.canonical_name

The full canonical name of the project including hostname. E.g., git.example.com/org/project.

zuul.projects{}.src_dir

The path to the source code, relative to the work dir. E.g., src/git.example.com/org/project.

zuul.projects{}.required

A boolean indicating whether this project appears in the job.required-projects list for this job.

zuul.projects{}.checkout

The branch or tag that Zuul checked out for this project. This may be influenced by the branch or tag associated with the item as well as the job configuration.

zuul.projects{}.checkout_description

A human-readable description of why Zuul chose this particular branch or tag to be checked out. This is intended as a debugging aid in the case of complex jobs. The specific text is not defined and is subject to change.

zuul.projects{}.commit

The hex SHA of the commit checked out. This commit may appear in the upstream repository, or if it the result of a speculative merge, it may only exist during the run of this job.

For example, to access the source directory of a single known project, you might use:

{{ zuul.projects['git.example.com/org/project'].src_dir }}

To iterate over the project list, you might write a task something like:

- name: Sample project iteration
  debug:
    msg: "Project {{ item.name }} is at {{ item.src_dir }}
  with_items: {{ zuul.projects.values() | list }}
zuul.playbook_context

This dictionary contains information about the execution of each playbook in the job. This may be useful for understanding exactly what playbooks and roles Zuul executed.

All paths herein are located under the root of the build directory (note that is one level higher than the workspace directory accessible to jobs on the executor).

zuul.playbook_context.playbook_projects
Type: dict

A dictionary of projects that have been checked out for playbook execution. When used in the trusted execution context, these will contain only merged commits in upstream repositories. In the case of the untrusted context, they may contain speculatively merged code.

The key is the path and each value is another dictionary with the following keys:

zuul.playbook_context.playbook_projects{}.canonical_name

The canonical name of the repository.

zuul.playbook_context.playbook_projects{}.checkout

The branch or tag checked out.

zuul.playbook_context.playbook_projects{}.commit

The hex SHA of the commit checked out. As above, this commit may or may not exist in the upstream repository depending on whether it was the result of a speculative merge.

zuul.playbook_context.playbooks
Type: list

An ordered list of playbooks executed for the job. Each item is a dictionary with the following keys:

zuul.playbook_context.playbooks[].path

The path to the playbook.

zuul.playbook_context.playbooks[].roles
Type: list

Information about the roles available to the playbook. The actual role path supplied to Ansible is the concatenation of the role_path entry in each of the following dictionaries. The rest of the information describes what is in the role path.

In order to deal with the many possible role layouts and aliases, each element in the role path gets its own directory. Depending on the contents and alias configuration for that role repo, a symlink is added to one of the repo checkouts in zuul.playbook_context.playbook_projects so that the role may be supplied to Ansible with the correct name.

zuul.playbook_context.playbooks[].roles[].checkout

The branch or tag checked out.

zuul.playbook_context.playbooks[].roles[].checkout_description

A human-readable description of why Zuul chose this particular branch or tag to be checked out. This is intended as a debugging aid in the case of complex jobs. The specific text is not defined and is subject to change.

The name of the symbolic link.

The target of the symbolic_link.

zuul.playbook_context.playbooks[].roles[].role_path

The role path passed to Ansible.

zuul.tenant

The name of the current Zuul tenant.

zuul.timeout

The job timeout, in seconds.

zuul.post_timeout

The post-run playbook timeout, in seconds.

zuul.jobtags

A list of tags associated with the job. Not to be confused with git tags, these are simply free-form text fields that can be used by the job for reporting or classification purposes.

zuul.resources

A job using a container build resources has access to a resources variable that describes the resource. Resources is a dictionary of group keys, each value consists of:

zuul.resources.namespace

The resource’s namespace name.

zuul.resources.context

The kube config context name.

zuul.resources.pod

The name of the pod when the label defines a kubectl connection.

Project or namespace resources might be used in a template as:

- hosts: localhost
    tasks:
    - name: Create a k8s resource
      k8s_raw:
        state: present
        context: "{{ zuul.resources['node-name'].context }}"
        namespace: "{{ zuul.resources['node-name'].namespace }}"

Kubectl resources might be used in a template as:

- hosts: localhost
    tasks:
    - name: Copy src repos to the pod
      command: >
        oc rsync -q --progress=false
            {{ zuul.executor.src_root }}/
            {{ zuul.resources['node-name'].pod }}:src/
        no_log: true

Working Directory

Additionally, some information about the working directory and the executor running the job is available:

zuul
zuul.executor

A number of values related to the executor running the job are available:

zuul.executor.hostname

The hostname of the executor.

zuul.executor.src_root

The path to the source directory.

zuul.executor.log_root

The path to the logs directory.

zuul.executor.work_root

The path to the working directory.

zuul.executor.inventory_file

The path to the inventory. This variable is needed for jobs running without a nodeset since Ansible doesn’t set it for localhost; see this porting guide.

The inventory file is only readable by jobs running in a trusted execution context.

zuul_success

Post run playbook(s) will be passed this variable to indicate if the run phase of the job was successful or not. This variable is meant to be used with the bool filter.

tasks:
  - shell: echo example
    when: zuul_success | bool
zuul_will_retry

Post run and cleanup playbook(s) will be passed this variable to indicate if the job will be retried. This variable is meant to be used with the bool filter.

tasks:
  - shell: echo example
    when: zuul_will_retry | bool
nodepool

Information about each host from Nodepool is supplied in the nodepool host variable. Availability of values varies based on the node and the driver that supplied it. Values may be null if they are not applicable.

nodepool.label

The nodepool label of this node.

nodepool.az

The availability zone in which this node was placed.

nodepool.cloud

The name of the cloud in which this node was created.

nodepool.provider

The name of the nodepool provider of this node.

nodepool.region

The name of the nodepool provider’s region.

nodepool.host_id

The cloud’s host identification for this node’s hypervisor.

nodepool.external_id

The cloud’s identifier for this node.

nodepool.slot

If the node supports running multiple jobs on the node, a unique numeric ID for the subdivision of the node assigned to this job. This may be used to avoid build directory collisions.

nodepool.interface_ip

The best IP address to use to contact the node as determined by the cloud provider and nodepool.

nodepool.public_ipv4

A public IPv4 address of the node.

nodepool.private_ipv4

A private IPv4 address of the node.

nodepool.public_ipv6

A public IPv6 address of the node.

nodepool.private_ipv6

A private IPv6 address of the node.

SSH Keys

Zuul starts each job with an SSH agent running and at least one key added to that agent. Generally you won’t need to be aware of this since Ansible will use this when performing any tasks on remote nodes. However, under some circumstances you may want to interact with the agent. For example, you may wish to add a key provided as a secret to the job in order to access a specific host, or you may want to, in a pre-playbook, replace the key used to log into the assigned nodes in order to further protect it from being abused by untrusted job content.

A description of each of the keys added to the SSH agent follows.

Nodepool Key

This key is supplied by the system administrator. It is expected to be accepted by every node supplied by Nodepool and is generally the key that will be used by Zuul when running jobs. Because of the potential for an unrelated job to add an arbitrary host to the Ansible inventory which might accept this key (e.g., a node for another job, or a static host), the use of the add-build-sshkey role is recommended.

Project Key

Each project in Zuul has its own SSH keypair. This key is added to the SSH agent for all jobs running in a post-review pipeline. If a system administrator trusts that project, they can add the project’s public key to systems to allow post-review jobs to access those systems. The systems may be added to the inventory using the add_host Ansible module, or they may be supplied by static nodes in Nodepool.

Zuul serves each project’s public SSH key using its build-in webserver. They can be fetched at the path /api/tenant/<tenant>/project-ssh-key/<project>.pub where <project> is the canonical name of a project and <tenant> is the name of a tenant with that project.

Return Values

A job may return some values to Zuul to affect its behavior and for use by dependent jobs. To return a value, use the zuul_return Ansible module in a job playbook. For example:

tasks:
  - zuul_return:
      data:
        foo: bar

Will return the dictionary {'foo': 'bar'} to Zuul.

Optionally, if you have a large supply of data to return, you may specify the path to a JSON-formatted file with that data. For example:

tasks:
  - zuul_return:
      file: /path/to/data.json

Normally returned data are provided to dependent jobs in the inventory file, which may end up in the log archive of a job. In the case where sensitive data must be provided to dependent jobs, the secret_data attribute may be used instead, and the data will be provided via the same mechanism as job secrets, where the data are not written to disk in the work directory. Care must still be taken to avoid displaying or storing sensitive data within the job. For example:

tasks:
  - zuul_return:
      secret_data:
        password: foobar

Any values other than those in the zuul hierarchy will be supplied as Ansible variables to dependent jobs. These variables have less precedence than any other type of variable in Zuul, so be sure their names are not shared by any job variables. If more than one parent job returns the same variable, the value from the later job in the job graph will take precedence.

The values in the zuul hierarchy are special variables that influence the behavior of zuul itself. The following paragraphs describe the currently supported special variables and their meaning.

Returning the log url

To set the log URL for a build, use zuul_return to set the zuul.log_url value. For example:

tasks:
  - zuul_return:
      data:
        zuul:
          log_url: http://logs.example.com/path/to/build/logs

Returning artifact URLs

If a build produces artifacts, any number of URLs may be returned to Zuul and stored in the SQL database. These will then be available via the web interface and subsequent jobs.

To provide artifact URLs for a build, use zuul_return to set keys under the zuul.artifacts dictionary. For example:

tasks:
  - zuul_return:
      data:
        zuul:
          artifacts:
            - name: tarball
              url: http://example.com/path/to/package.tar.gz
              metadata:
                version: 3.0
            - name: docs
              url: build/docs/

If the value of url is a relative URL, it will be combined with the zuul.log_url value if set to create an absolute URL. The metadata key is optional; if it is provided, it must be a dictionary; its keys and values may be anything.

If zuul_return is invoked multiple times (e.g., via multiple playbooks), then the elements of zuul.artifacts from each invocation will be appended.

Skipping dependent jobs

Note

In the following section the use of ‘child jobs’ refers to dependent jobs configured by job.dependencies and should not be confused with jobs that inherit from a parent job.

To skip a dependent job for the current build, use zuul_return to set the zuul.child_jobs value. For example:

tasks:
  - zuul_return:
      data:
        zuul:
          child_jobs:
            - dependent_jobA
            - dependent_jobC

Will tell zuul to only run the dependent_jobA and dependent_jobC for pre-configured dependent jobs. If dependent_jobB was configured, it would be now marked as SKIPPED. If zuul.child_jobs is empty, all jobs will be marked as SKIPPED. Invalid dependent jobs are stripped and ignored, if only invalid jobs are listed it is the same as providing an empty list to zuul.child_jobs.

Leaving warnings

A job can leave warnings that will be appended to the comment zuul leaves on the change. Use zuul_return to add a list of warnings. For example:

tasks:
  - zuul_return:
      data:
        zuul:
          warnings:
            - This warning will be posted on the change.

If zuul_return is invoked multiple times (e.g., via multiple playbooks), then the elements of zuul.warnings from each invocation will be appended.

Leaving file comments

To instruct the reporters to leave line comments on files in the change, set the zuul.file_comments value. For example:

tasks:
  - zuul_return:
      data:
        zuul:
          file_comments:
            path/to/file.py:
              - line: 42
                message: "Line too long"
                level: info
              - line: 82
                message: "Line too short"
              - line: 119
                message: "This block is indented too far."
                level: warning
                range:
                  start_line: 117
                  start_character:    0
                  end_line:   119
                  end_character:  37

Not all reporters currently support line comments (or all of the features of line comments); in these cases, reporters will simply ignore this data. The level is optional, but if provided must be one of info, warning, error.

Zuul will attempt to automatically translate the supplied line numbers to the corresponding lines in the original change as written (they may differ due to other changes which may have merged since the change was written). If this produces erroneous results for a job, the behavior may be disabled by setting the zuul.disable_file_comment_line_mapping variable to true in zuul_return.

If zuul_return is invoked multiple times (e.g., via multiple playbooks), then the elements of zuul.file_comments from each invocation will be appended.

Pausing the job

A job can be paused after the run phase by notifing zuul during the run phase. In this case the dependent jobs can start and the prior job stays paused until all dependent jobs are finished. This for example can be useful to start a docker registry in a job that will be used by the dependent job. To indicate that the job should be paused use zuul_return to set the zuul.pause value. You still can at the same time supply any arbitrary data to the dependent jobs. For example:

tasks:
  - zuul_return:
      data:
        zuul:
          pause: true
        registry_ip_address: "{{ hostvars[groups.all[0]].ansible_host }}"

Skipping retries

It’s possible to skip the retry caused by a failure in pre-run by setting zuul.retry to false.

For example the following would skip retrying the build:

tasks:
  - zuul_return:
      data:
        zuul:
          retry: false

Ansible Groups

Ansible host groups may be configured via the job’s nodeset. In addition to these, Zuul automatically creates a group named zuul_unreachable. It is always present, and is empty when the job starts. If any playbook encounters an unreachable host, that host is added to the group for all subsequent playbooks. This can be used to avoid executing certain post-run playbook steps on hosts that are already known to be unreachable. For example, to avoid copying logs from a remote host, a play might look something like:

- hosts: all:!zuul_unreachable
  gather_facts: no
  tasks:
    - name: Copy logs
      ...

The group name zuul_unreachable is reserved by zuul and will automatically override any similarly named group defined by the nodeset.

Build Status

A job build may have the following status:

SUCCESS

Nominal job execution.

FAILURE

Job executed correctly, but exited with a failure.

RETRY

The pre-run playbook failed and the job will be retried.

RETRY_LIMIT

The pre-run playbook failed more than the maximum number of retry attempts.

POST_FAILURE

The post-run playbook failed.

SKIPPED

One of the build dependencies failed and this job was not executed.

NODE_FAILURE

The test instance provider was unable to fullfill the nodeset request. This can happen if Nodepool is unable to provide the requested node(s) for the request.