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154 lines
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154 lines
4.7 KiB
ReStructuredText
Try
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===
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"Try" is a way to "try out" a proposed change safely before review, without
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officially landing it. This functionality has been around for a *long* time in
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various forms, and can sometimes show its age.
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Access to "push to try" is typically available to a much larger group of
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developers than those who can land changes in integration and release branches.
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Specifically, try pushes are allowed for anyone with `SCM Level`_ 1, while
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integration branches are at SCM level 3.
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Scheduling a Task on Try
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------------------------
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There are three methods for scheduling a task on try: legacy try option syntax,
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try task config, and an empty try.
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Try Option Syntax
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:::::::::::::::::
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The first, older method is a command line string called ``try syntax`` which is passed
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into the decision task via the commit message. The resulting commit is then
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pushed to the https://hg.mozilla.org/try repository. An example try syntax
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might look like:
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.. parsed-literal::
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try: -b o -p linux64 -u mochitest-1 -t none
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This gets parsed by ``taskgraph.try_option_syntax:TryOptionSyntax`` and returns
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a list of matching task labels. For more information see the
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`TryServer wiki page <https://wiki.mozilla.org/Try>`_.
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Try Task Config
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:::::::::::::::
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The second, more modern method specifies exactly the tasks to run. That list
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of tasks is usually generated locally with some :doc:`local tool </tools/try/selectors/fuzzy>`
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and attached to the commit pushed to the try repository. This gives
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finer control over exactly what runs and enables growth of an
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ecosystem of tooling appropriate to varied circumstances.
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Implementation
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,,,,,,,,,,,,,,
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This method uses a checked-in file called ``try_task_config.json`` which lives
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at the root of the source dir. The JSON object in this file contains a
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``tasks`` key giving the labels of the tasks to run. For example, the
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``try_task_config.json`` file might look like:
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.. parsed-literal::
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{
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"version": 1,
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"tasks": [
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"test-windows10-64/opt-web-platform-tests-12",
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"test-windows7-32/opt-reftest-1",
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"test-windows7-32/opt-reftest-2",
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"test-windows7-32/opt-reftest-3",
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"build-linux64/debug",
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"source-test-mozlint-eslint"
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]
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}
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Very simply, this will run any task label that gets passed in as well as their
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dependencies. While it is possible to manually commit this file and push to
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try, it is mainly meant to be a generation target for various :ref:`try server <Pushing to Try>`
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choosers. For example:
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.. parsed-literal::
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$ ./mach try fuzzy
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A list of all possible task labels can be obtained by running:
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.. parsed-literal::
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$ ./mach taskgraph tasks
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A list of task labels relevant to a tree (defaults to mozilla-central) can be
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obtained with:
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.. parsed-literal::
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$ ./mach taskgraph target
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Modifying Tasks in a Try Push
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,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
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It's possible to alter the definition of a task by defining additional
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configuration in ``try_task_config.json``. For example, to set an environment
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variable in all tasks, you can add:
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.. parsed-literal::
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{
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"version": 1,
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"tasks": [...],
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"env": {
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"FOO": "bar"
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}
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}
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The allowed configs are defined in :py:obj:`taskgraph.decision.try_task_config_schema`.
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The values will be available to all transforms, so how each config applies will
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vary wildly from one context to the next. Some (such as ``env``) will affect
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all tasks in the graph. Others might only affect certain kinds of task. The
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``use-artifact-builds`` config only applies to build tasks for instance.
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Empty Try
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:::::::::
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If there is no try syntax or ``try_task_config.json``, the ``try_mode``
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parameter is None and no tasks are selected to run. The resulting push will
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only have a decision task, but one with an "add jobs" action that can be used
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to add the desired jobs to the try push.
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Complex Configuration
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:::::::::::::::::::::
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If you need more control over the build configuration,
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(:doc:`staging releases </tools/try/selectors/release>`, for example),
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you can directly specify :doc:`parameters <parameters>`
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to override from the ``try_task_config.json`` like this:
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.. parsed-literal::
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{
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"version": 2,
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"parameters": {
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"optimize_target_tasks": true,
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"release_type": "beta",
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"target_tasks_method": "staging_release_builds"
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}
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}
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This format can express a superset of the version 1 format, as the
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version one configuration is equivalent to the following version 2
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config.
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.. parsed-literal::
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{
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"version": 2,
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"parameters": {
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"try_task_config": {...},
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"try_mode": "try_task_config",
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}
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}
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.. _SCM Level: https://www.mozilla.org/en-US/about/governance/policies/commit/access-policy/
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