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Prevent #3679 from appearing in blame results #13311

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Jul 18, 2022
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Prevent #3679 from appearing in blame results #13311

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233aaf1
Prevent another black run from appearing in blame results
anoadragon453 Jul 18, 2022
c3c5064
changelog
anoadragon453 Jul 18, 2022
72d14e9
Add a001038b92c4f0082cad60e5e87d0bd01374c9de as well
anoadragon453 Jul 18, 2022
7d6294a
Remove second commit; add docs to .git-blame-ignore-revs
anoadragon453 Jul 18, 2022
60c70f1
Mention blame.ignoreRevsFile
anoadragon453 Jul 18, 2022
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13 changes: 13 additions & 0 deletions .git-blame-ignore-revs
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Original file line number Diff line number Diff line change
@@ -1,3 +1,16 @@
# Commits in this file will be removed from GitHub blame results.
#
# To use this file locally, use:
# git blame --ignore-revs-file="path/to/.git-blame-ignore-revs" <files>
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#
# or configure the `blame.ignoreRevsFile` option in your git config.
#
# If ignoring a pull request that was not squash merged, only the merge
# commit needs to be put here. Child commits will be resolved from it.
Comment on lines +8 to +9
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@DMRobertson DMRobertson Jul 18, 2022 •
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Don't know enough about how git blame works here (https://github.com/git/git/blob/f9b95943b68b6b8ca5a6072f50a08411c6449b55/blame.c#L2582 for the brave), but I'm a little suspicious here. I would guess that the merge commit shows up in blame if and only if

  • the file being blamed was in conflict, and
  • there was a manual merge process: we didn't resolve by just checking out the file at one of the merge parents. (I.e. the merge commit needed to create a new blob object).

Happy to leave this as-is though.

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@anoadragon453 anoadragon453 Jul 18, 2022 •
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The merge conflict unintuitively does not show up in git blame - the actual commit does. However, only adding the merge commit to .git-blame-ignore-revs actually removed the changes from git blame.

I was mostly guessing that git blame follows children of merge commits based off the description of the `--first-parent option.

One can try it themselves with:

merge commit:

git blame --ignore-rev 8b3d9b6b199abb87246f982d5db356f1966db925 tests/api/test_auth.py

vs.

git blame --ignore-rev a001038b92c4f0082cad60e5e87d0bd01374c9de tests/api/test_auth.py

and searching for 8b3d9b. You'll see that the latter makes no difference... unintuitively.


# Run black (#3679).
8b3d9b6b199abb87246f982d5db356f1966db925

# Black reformatting (#5482).
32e7c9e7f20b57dd081023ac42d6931a8da9b3a3

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1 change: 1 addition & 0 deletions changelog.d/13311.misc
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Prevent formatting changes of [#3679](https://github.com/matrix-org/synapse/pull/3679) from appearing in `git blame`.