Aravind Vasudevan 9f9bab25da Reland "Update gclient to use git config caching" ...

This reverts commit 3569608028.

Reason for revert: This includes a fix for crbug.com/324358728.

The rebase-update command has logic which tries to specifically set a key to an empty string and this has been intentionally set this way[1]. The new SetConfig implementation does treats empty string as None and hence tries to unset the config, resulting in error code 5. The patchset 2 fixes this bug and adds a test to ensure SetConfig can set an empty string to be backward compatible.

[1] https://codereview.chromium.org/228353003

Original change's description:
> Revert "Update gclient to use git config caching"
>
> This reverts commit 3edda8d185.
>
> Reason for revert: Breaks rebase-update; crbug.com/324358728
>
> Original change's description:
> > Update gclient to use git config caching
> >
> > This change updates all the modules used by gclient to use `scm.GIT` for git config calls over directly invoking the subprocess.
> >
> > This change currently doesn't modify git_cache since the config reads and writes within it are done on bare repository. A follow-up CL will update git_cache.
> >
> > A follow-up CL will also update git_cl and git_map_branches since they have shown performance improvements too: https://crrev.com/c/4697786.
> >
> > Benchmarking
> > ============
> > With chromium/src as the baseline super project, this change reduces about 380 git config calls out of 507 total calls on cache hits during no-op. The below numbers are benchmarked with `update_depot_tools` turned off.
> >
> > Windows Benchmark
> > =================
> > Baseline (gpaste/6360045736951808): ~1min 12 sec.
> > With Caching (gpaste/6480065209040896): ~1min 3sec.
> > ~12.5% decrease in gclient sync noop runtime.
> >
> > Linux Benchmark
> > ===============
> > Baseline (gpaste/4730436763254784): ~3.739 sec.
> > With Caching (gpaste/4849870978940928): ~3.534 sec.
> > ~5.5% decrease in gclient sync noop runtime.
> >
> > Bug: 1501984
> > Change-Id: Ib48df2d26a0c742a9b555a1e2ed6366221c7db17
> > Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/5252498
> > Commit-Queue: Aravind Vasudevan <aravindvasudev@google.com>
> > Reviewed-by: Josip Sokcevic <sokcevic@chromium.org>
>
> Bug: 1501984
> Change-Id: I4a603238d9ed43edafc8e574493800670520a1d9
> No-Presubmit: true
> No-Tree-Checks: true
> No-Try: true
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/5279198
> Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
> Commit-Queue: Aravind Vasudevan <aravindvasudev@google.com>

Bug: 1501984
Change-Id: I405abc16c2ef6f0689031c82c61af71aad302122
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/5280779
Reviewed-by: Josip Sokcevic <sokcevic@chromium.org>
Commit-Queue: Aravind Vasudevan <aravindvasudev@google.com>

2024-02-12 17:32:17 +00:00

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