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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

Push Information

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

   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``.

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

   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

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

   The try syntax in the commit message, if any.

   The ID from the ``hg.mozilla.org`` pushlog

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

  The mercurial branch where the revision lives in.

   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.

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

   The ``tasks_for`` value used to generate the decision task.

Tree Information

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

   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

    The mode in which a try push is operating.  This can be one of
    ``"try_task_config"``, ``"try_option_syntax"``, ``"try_select"`` or ``None`` meaning no try
    input was provided.

    ``"try_select"`` is used by ``mach try fuzzy`` to build a list of tasks to select from.

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

    The contents of the ``try_task_config.json`` file, or ``None`` if
    ``try_mode`` is not ``try_task_config``.

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).

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

    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``.

   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.


    If true, then target tasks are eligible for optimization.

   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.

   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

   Specify the release promotion build number.

   Specify the version for release tasks.

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

   Specify the next version for version bump tasks.

   The type of release being promoted. One of "nightly", "beta", "esr60", "release-rc", or "release".

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

   Boolean which controls repacking vanilla Firefox builds for partners.

   List of partners to repack. A null value defaults to all.

   Configuration for partner repacks.

   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.

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

   The product that is being released.

   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.

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

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.