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[3.9] bpo-40548: Fix "Check for source changes (pull_request)" GH Action job (GH-21806) #21814

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miss-islington merged 1 commit into from
Aug 10, 2020
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[3.9] bpo-40548: Fix "Check for source changes (pull_request)" GH Action job (GH-21806) #21814

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bpo-40548: Fix "Check for source changes (pull_request)" GH Action job ( 
GH-21806)

On Git 2.28, "git diff master..." (3 dots) no longer works when
"fetch --depth=1" is used, whereas it works on Git 2.26.

Replace "..." (3 dots) with ".." (2 dots) in the "git diff" command
computing the list of modified files between the base branch and the
PR branch.
(cherry picked from commit eaa5517)

Co-authored-by: Victor Stinner <vstinner@python.org>
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@vstinner @miss-islington
vstinner authored and miss-islington committed Aug 10, 2020
commit e18b2416e8def071eea3fd62084db8a2c416df21
15 changes: 14 additions & 1 deletion .github/workflows/build.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -32,7 +32,20 @@ jobs:
echo '::set-output name=run_tests::true'
else
git fetch origin $GITHUB_BASE_REF --depth=1
git diff --name-only origin/$GITHUB_BASE_REF... | grep -qvE '(\.rst$|^Doc|^Misc)' && echo '::set-output name=run_tests::true' || true
# git diff "origin/$GITHUB_BASE_REF..." (3 dots) may be more
# reliable than git diff "origin/$GITHUB_BASE_REF.." (2 dots),
# but it requires to download more commits (this job uses
# "git fetch --depth=1").
#
# git diff "origin/$GITHUB_BASE_REF..." (3 dots) works with Git
# 2.26, but Git 2.28 is stricter and fails with "no merge base".
#
# git diff "origin/$GITHUB_BASE_REF.." (2 dots) should be enough on
# GitHub, since GitHub starts by merging origin/$GITHUB_BASE_REF
# into the PR branch anyway.
#
# https://github.com/python/core-workflow/issues/373
git diff --name-only origin/$GITHUB_BASE_REF.. | grep -qvE '(\.rst$|^Doc|^Misc)' && echo '::set-output name=run_tests::true' || true
fi
build_win32:
name: 'Windows (x86)'
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