Remove Regression Test Selection (RTS) support Regression Test Selection (RTS) and Smart Test Selection (STS) are no longer supported in MB. This CL completely removes RTS integration, command-line arguments, helper methods, and related config files. Specifically, this CL: - Removes `--rts-model` and `--sts-config-file` arguments from the CLI. - Removes the unused methods `RtsSelect`, `GetFilterFilePath`, and `AddFilterFileArg`. - Deletes `tools/mb/rts_banned_suites.json` and its loading logic. - Removes `use_rts=true` from gn_args when RTS was enabled. - Cleans up `mb_unittest.py` mocks to remove references to the deleted `rts_banned_suites.json` file. Bug: 515115287 Change-Id: I62a7a1d57897b0f1494de1c873fa851f8aaedf77 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7872353 Reviewed-by: Struan Shrimpton <sshrimp@google.com> Reviewed-by: Ben Pastene <bpastene@chromium.org> Commit-Queue: Diego Becerra Merodio <diegobecerra@google.com> Cr-Commit-Position: refs/heads/main@{#1649287} NOKEYCHECK=True GitOrigin-RevId: 555a6c77532d302a2347a98f9c8cd1fe7efb37d9
MB is a simple wrapper around the GN build tool.
It was originally written as part of the GYP->GN migration, in order to provide a uniform interface to either GYP or GN, such that users and bots can call one script and not need to worry about whether a given bot was meant to use GN or GYP.
It eventually grew additional functionality and is now still used even though everything is GN-only.
It supports two main functions:
“gen” - the main gn gen invocation that generates the Ninja files needed for the build.
“analyze” - the step that takes a list of modified files and a list of desired targets and reports which targets will need to be rebuilt.
We also use MB as a forcing function to collect all of the different build configurations that we actually support for Chromium builds into one place, in //tools/mb/mb_config.pyl.
For more information, see: