Parameters

Task-graph generation takes a collection of parameters as input, in the form of a JSON or YAML file.

During decision-task processing, some of these parameters are supplied on the command line or by environment variables. The decision task helpfully produces a full parameters file as one of its output artifacts. The other mach taskgraph commands can take this file as input. This can be very helpful when working on a change to the task graph.

When experimenting with local runs of the task-graph generation, it is always best to find a recent decision task’s parameters.yml file, and modify that file if necessary, rather than starting from scratch. This ensures you have a complete set of parameters.

The properties of the parameters object are described here, divided roughly by topic.

Push Information

backstop

Whether or not this push is a “backstop” push. That is a push where all builds and tests should run to ensure regressions aren’t accidentally missed.

base_repository

The repository from which to do an initial clone, utilizing any available caching.

head_repository

The repository containing the changeset to be built. This may differ from base_repository in cases where base_repository is likely to be cached and only a few additional commits are needed from head_repository.

head_rev

The revision to check out; this can be a short revision string

head_ref

For Mercurial repositories, this is the same as head_rev. For git repositories, which do not allow pulling explicit revisions, this gives the symbolic ref containing head_rev that should be pulled from head_repository.

owner

Email address indicating the person who made the push. Note that this value may be forged and must not be relied on for authentication.

message

The try syntax in the commit message, if any.

pushlog_id

The ID from the hg.mozilla.org pushlog

pushdate

The timestamp of the push to the repository that triggered this decision task. Expressed as an integer seconds since the UNIX epoch.

hg_branch

The mercurial branch where the revision lives in.

build_date

The timestamp of the build date. Defaults to pushdate and falls back to present time of taskgraph invocation. Expressed as an integer seconds since the UNIX epoch.

moz_build_date

A formatted timestamp of build_date. Expressed as a string with the following format: %Y%m%d%H%M%S

tasks_for

The tasks_for value used to generate the decision task.

Tree Information

project

Another name for what may otherwise be called tree or branch or repository. This is the unqualified name, such as mozilla-central or cedar.

level

The SCM level associated with this tree. This dictates the names of resources used in the generated tasks, and those tasks will fail if it is incorrect.

Try Configuration

try_mode

The mode in which a try push is operating. This can be one of:

  • "try_task_config" - Used to configure the taskgraph.

  • "try_option_syntax" - Used when pushing to try with legacy try syntax.

  • "try_auto" - Used to make try pushes behave more like a push on autoland.

  • "try_select" - Used by mach try to build a list of tasks locally.

  • None - Not a try push or mach try release.

try_options

The arguments given as try syntax (as a dictionary), or None if try_mode is not try_option_syntax.

try_task_config

The contents of the try_task_config.json file, or {} if try_mode is not try_task_config.

Test Configuration

test_manifest_loader

The test manifest loader to use as defined in taskgraph.util.chunking.manifest_loaders.

Target Set

The “target set” is the set of task labels which must be included in a task graph. The task graph generation process will include any tasks required by those in the target set, recursively. In a decision task, this set can be specified programmatically using one of a variety of methods (e.g., parsing try syntax or reading a project-specific configuration file).

filters

List of filter functions (from taskcluster/taskgraph/filter_tasks.py) to apply. This is usually defined internally, as filters are typically global.

target_tasks_method

The method to use to determine the target task set. This is the suffix of one of the functions in taskcluster/taskgraph/target_tasks.py.

release_history

History of recent releases by platform and locale, used when generating partial updates for nightly releases. Suitable contents can be generated with mach release-history, which will print to the console by default.

Optimization

optimize_strategies

A python path of the form <module>:<object> containing a dictionary of optimization strategies to use, overwriting the defaults.

optimize_target_tasks

If true, then target tasks are eligible for optimization.

do_not_optimize

Specify tasks to not optimize out of the graph. This is a list of labels. Any tasks in the graph matching one of the labels will not be optimized out of the graph.

existing_tasks

Specify tasks to optimize out of the graph. This is a dictionary of label to taskId. Any tasks in the graph matching one of the labels will use the previously-run taskId rather than submitting a new task.

Release Promotion

build_number

Specify the release promotion build number.

version

Specify the version for release tasks.

app_version

Specify the application version for release tasks. For releases, this is often a less specific version number than version.

next_version

Specify the next version for version bump tasks.

release_type

The type of release being promoted. One of “nightly”, “beta”, “esr78”, “release-rc”, or “release”.

release_eta

The time and date when a release is scheduled to live. This value is passed to Balrog.

release_enable_partner_repack

Boolean which controls repacking vanilla Firefox builds for partners.

release_enable_partner_attribution

Boolean which controls adding attribution to vanilla Firefox builds for partners.

release_enable_emefree

Boolean which controls repacking vanilla Firefox builds into EME-free builds.

release_partners

List of partners to repack or attribute if a subset of the whole config. A null value defaults to all.

release_partner_config

Configuration for partner repacks & attribution, as well as EME-free repacks.

release_partner_build_number

The build number for partner repacks. We sometimes have multiple partner build numbers per release build number; this parameter lets us bump them independently. Defaults to 1.

release_product

The product that is being released.

required_signoffs

A list of signoffs that are required for this release promotion flavor. If specified, and if the corresponding signoff_urls url isn’t specified, tasks that require these signoffs will not be scheduled.

signoff_urls

A dictionary of signoff keys to url values. These are the urls marking the corresponding required_signoffs as signed off.

Repository Merge Day

merge_config

Merge config describes the repository merge behaviour, using an alias to cover which set of file replacements and version increments are required, along with overrides for the source and target repository URIs.

source_repo

The clone/push URI of the source repository, such as https://hg.mozilla.org/mozilla-central

target_repo

The clone/push URI of the target repository, such as https://hg.mozilla.org/releases/mozilla-beta

source_branch

The firefoxtree alias of the source branch, such as ‘central’, ‘beta’

target_branch

The firefoxtree alias of the target branch, such as ‘beta’, ‘release’

force-dry-run

Don’t push any results to target repositories.

Comm Push Information

These parameters correspond to the repository and revision of the comm-central repository to checkout. Their meaning is the same as the corresponding parameters for the gecko repository above. They are optional, but if any of them are specified, they must all be specified.

comm_base_repository comm_head_repository comm_head_rev comm_head_ref

Code Review

phabricator_diff

The code review process needs to know the Phabricator Differential diff that started the analysis. This parameter must start with PHID-DIFF-

Local configuration

target-kind

Generate only the given kind and its kind-dependencies. This is used for local inspection of the graph and is not supported at run-time.