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TryChooser lets you select specific jobs you want to run on [https://wiki.mozilla.org/Build:TryServer tryserver].  You use TryChooser by putting a <tt>try:</tt> block at the end of the topmost commit message when you push to try.
#REDIRECT [[ReleaseEngineering/TryServer]]
==Syntax Builder==
To simplify using the TryChooser, you can use the [http://trychooser.pub.build.mozilla.org/ TryChooser Syntax Builder] website
or the [http://hg.mozilla.org/users/pbiggar_mozilla.com/trychooser/file/tip mercurial extension] (which also functions as a command-line application, but is not maintained by RelEng).
 
==Defaults==
 
If you don't specify an option or if you give an invalid value for an option, TryChooser will use its default for that option:
 
try: --build do
      --platform all
      --unittests all
      --talos none
 
==Examples==
; <tt>try: -b do -p all -u all -t none</tt>
: Run all platforms, all tests, no talos.  You probably want to narrow down the test scope though if your change does not affect all platforms and all unit tests.:
 
; <tt>try: -b do -u crashtest</tt>
: Debug and optimized builds, all available platforms, only crashtests, no talos:
 
; <tt>try: -b d -p linux -u none</tt>
: Linux debug build, no unittests, no talos:
 
; <tt>try: -b do -u all -t chrome,nochrome</tt>
: Debug and optimized builds for all platforms, all unittests, select talos:
 
; <tt>try: -b do -u all -t chrome,nochrome mozharness: --spsProfile</tt>
: Same as above but run talos in profiling mode so that it produces zip files with profiles that can be opened in Cleopatra. See [https://wiki.mozilla.org/Buildbot/Talos/Profiling Talos Profiling].
 
; <tt>try: -b o -u jsreftest,crashtest,mochitest-1 -t tp4,scroll</tt>
: Opt builds on all available platforms, select unittests, select talos
 
; <tt>try: -b o -u all -n --post-to-bugzilla bug 456234</tt>
: Opt builds on all available platforms, all unittests, no emails, results posted to bug 456234
 
; <tt>try: -b d -p macosx64 -u all[10.7]</tt>
: Debug builds for 64-bit OSX, run all tests only on OSX 10.7 machines
 
; <tt>try: -b d -p macosx64 -u all[-10.7]</tt>
: Debug builds for 64-bit OSX, run all tests but not on all OSX test platforms except OSX 10.7
 
; <tt>try: -b do -p all -u all[x64]</tt>
: "T push" -- good replacement for <tt>-p all -u all</tt>. Builds on all platforms, runs all tests on linux64.
 
; <tt>try: -b do -p all -u all[10.8]</tt>
: Same as above, but run the tests on OSX 10.8 instead
 
You may precede the <tt>try:</tt> section with other text:
  bug 12345 attempt 2, try: -b d -p linux64 -t jsreftest
 
==Workflow==
 
===Without MQ===
 
If you're not using Mercurial Queues, you can use TryChooser by including a "try:" string in the message of the commit you push to try:
 
$ (edit your code)
$ hg commit -m "Bug XXXXXX - Change foo to bar.  try: -b d -p all"
$ hg push -f <nowiki>ssh://hg.mozilla.org/try</nowiki>
 
===With MQ===
 
'''Note:''' If you are running Mercurial 2.1 or higher, see [[Build:TryServer#hg_phases|this note]] about phases. ({{bug|725362}})
 
If you're using Mercurial Queues, you can use TryChooser by adding an empty patch with a "try:" string to the top of your queue:
 
hg qgoto your-patch
hg qnew -m "try: <Insert options here>" try
hg push -f -rtip <nowiki>ssh://hg.mozilla.org/try</nowiki>
 
After pushing, you can remove the empty patch:
 
hg qpop
hg qremove try
 
==FAQ==
===What if I want PGO for my build===
Until {{bug|691673}} is resolved, you'll have to do a small hack if you want PGO to work on your try push. Add
mk_add_options MOZ_PGO=1
to <tt>[https://mxr.mozilla.org/mozilla-central/source/build/mozconfig.common.override build/mozconfig.common.override]</tt>.
 
===What if I don't put "try:" in my commit message?===
If you don't give a "try:" string in your commit message, you'll get an error message on attempts to push to try as per {{bug|649402}} where try syntax use was made mandatory.
 
===What if make a syntax error in my commit message?===
If you pass an invalid parameter, TryChooser will ignore it and substitute the default in its place.  For instance, if you specify <tt>try: -b f -u crashtest</tt>, you'll get both debug and optimized builds, since "f" is not a recognized argument.  You'll only get crashtest run on those builds, however.
 
===Where's the full list of unit tests and talos tests I can request?===
 
Try should have the same test/talos suites available to it as mozilla-central does so you can refer to [https://treeherder.mozilla.org Treeherder] for complete listings.
 
To match up the Talos suite name to the tests it runs you can go [http://hg.mozilla.org/build/buildbot-configs/file/701b6ccd8e55/mozilla-tests/config.py#l19 here]. (eg: 'chrome' runs ts:tdhtml:twinopen:tsspider)
 
If you need help building the syntax line you can also go to the [http://trychooser.pub.build.mozilla.org/ TryChooser Syntax Builder] page.
 
===What do I do if I need to add a job after I push?===
Use try extender on Treeherder. To be announced in November.
 
===What do I do if I need to remove a job after I push?===
Check out [https://build.mozilla.org/buildapi/self-serve Self Serve!]. With Self-Serve you can cancel pending builds, re-build/run completed builds/test/talos runs.
 
===What do I do if I used the wrong syntax and I'm missing a job?===
With the [[ReleaseEngineering/How_To/Trigger_arbitrary_jobs|arbitrary jobs API]] you can trigger jobs that would have not been triggered according to your Try syntax.
You can even specify a different build or tests.zip.
 
===Where are my builds/test/talos?===
If you think Treeherder is missing results or it feels like it's been a while since you kicked the build off and you're getting antsy for results.  Here are some things you can look into before pinging the person on buildduty:
* Did the build compile successfully?  If it didn't, you won't get unittests or talos results.
**Look for your directory in [http://ftp.mozilla.org/pub/mozilla.org/firefox/tryserver-builds/ the builds FTP server] and see what has been uploaded.  (You can also find here the email-changeset string that you'll need if you end up pinging releng.)
* Check [http://build.mozilla.org/buildapi/running/ Running] and [http://build.mozilla.org/buildapi/pending/ Pending] to view your build's status, since these are where Treeherder gets the job data from, so are closer to the source of truth.
 
==Parsing details==
 
The parser for TryChooser is [http://hg.mozilla.org/build/buildbotcustom/file/tip/try_parser.py here].
 
The basic algorithm is:
* The commit message is split on 'try:'.
* Whatever follows after 'try:' is passed to try_parser as a string.
* The string is processed into a list of args handed to parse_known_args (thus keeping anything that is not a recognized argument from causing errors).
 
The email preferences are parsed out in the [http://hg.mozilla.org/build/buildbotcustom/file/tip/bin/try_mailer.py try_mailer] script, and the --post-to-bugzilla flag is currently a work in progress but will land in the RelEng [http://hg.mozilla.org/build/tools/scripts/autoland tools] repo as part of the [https://wiki.mozilla.org/BugzillaAutoLanding Bugzilla Autolanding] project.
 
==Buildduty Issues==
=== How to Deploy TryChooser changes ===
[[ReleaseEngineering/How_To/Update_TryChooser]]
 
=== Jobs not scheduled at all? ===
Recreate the comment of their change with http://trychooser.pub.build.mozilla.org/ and compare it to make sure is correct.
 
Then do a sendchange and tail the scheduler master:
<pre>
buildbot sendchange --master buildbot-master10:9301 --revision 923103d5a656 \
  --branch try --username mpalmgren@mozilla.com \
  --comments "try: -b d -p linux -u all" doit
</pre>
 
* If tryserver was just reset verify that [[ReleaseEngineering/How_To/Reset_the_Try_Server#Try_Hg_Poller_state|the scheduler has been reset]]
 
=== Using the TryChooser to submit build/test requests ===
Buildduty can also use the same TryChooser syntax as developers use to (re)submit build and testing requests. Here is an example:
 
<pre>
buildbot sendchange --master buildbot-master10:9301 --revision 923103d5a656 \
  --branch try --username mpalmgren@mozilla.com \
  --comments "try: -b d -p linux -u all" doit
</pre>
 
=== Unable to schedule builds due to missing 'requests' package ===
As with pip 8.0, the '--download-cache' option has been removed (it was already deprecated since 6.0). The fix for this issue was removing the argument in mozharness config (see https://hg.mozilla.org/try/rev/1c396281c01b).
In order to build with a base revision prior to '1c396281c01b', you will need to rebase your patch to use a newer version.
 
== Source code ==
 
The trychooser syntax builder lives in the buildtools repository, under the subdirectory "trychooser":
 
* Mercurial: https://hg.mozilla.org/build/tools/
* Git: https://github.com/mozilla/build-tools/

Latest revision as of 15:00, 2 May 2019

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