Scott Lee 927f7dad38 presubmit: use git diff -U0 for CheckPatchFormatted() ...

git cl format uses `git diff -U0` when it has to find the files
and ranges to format. Similarly, CiderG generates diffs with
-U0 and run presubmits for the checks.

However, the scm.py:GenerateDiff(), which CheckPatchFormatted() uses,
doesn't specify -U and it defaults to -U3.

This CL updates CheckPatchFormatted() to pass -U0 to
scm.py:GenerateDiff() so that Presubmit and git cl format are
always given diffs generated with -U0.

Bug: 386840832
Change-Id: I19479ab139b7dba8ba4e5e5fed89eca4d2e66412
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/6952890
Auto-Submit: Scott Lee <ddoman@chromium.org>
Commit-Queue: Brian Ryner <bryner@google.com>
Commit-Queue: Scott Lee <ddoman@chromium.org>
Reviewed-by: Brian Ryner <bryner@google.com>

2025-09-16 09:50:19 -07:00

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