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
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 rougly by topic.
- The repository from which to do an initial clone, utilizing any available caching.
- The repository containing the changeset to be built. This may differ from
base_repositoryin cases where
base_repositoryis likely to be cached and only a few additional commits are needed from
- 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_revthat should be pulled from
- Include nightly builds and tests in the graph.
- 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 commit message
- The ID from the
- The timestamp of the push to the repository that triggered this decision task. Expressed as an integer seconds since the UNIX epoch.
- The timestamp of the build date. Defaults to
pushdateand 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
- Another name for what may otherwise be called tree or branch or
repository. This is the unqualified name, such as
- 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.
- The mode in which a try push is operating. This can be one of
Nonemeaning no try input was provided.
- The arguments given as try syntax (as a dictionary), or
- The contents of the
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 global.
- The method to use to determine the target task set. This is the suffix of
one of the functions in
- If true, then nightly tasks are eligible for optimization.
- 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.
- Specify the release promotion build number.
- Specify the next version for version bump tasks.
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.