Merge #12708: Make verify-commits.sh test that merges are clean

577f111 Make verify-commits.sh test that merges are clean (Pieter Wuille)

Pull request description:

  Unsure if we want this.

  This modifies verify-commits.sh to redo all merges along the leftmost commit branch (which includes all PR merges), and verify whether they match the merge commit's trees.

  The benefit is that it will detect a case where one of the maintainers merges a PR, but makes an unrelated change inside the merge commit. This on itself is not very strong, as unrelated changes can also be included in the merged branch itself - but perhaps the merge commit is not something that people are otherwise likely to look at.

  Fixes #8089

Tree-SHA512: 2c020f5ac3f771ac775aa726832916bb8e03a311b2745d7a9825047239bd0660d838f086f3456f2bb05cea14c1529f74436b8cdd74cc94b70e40b4617309f62c
This commit is contained in:
Wladimir J. van der Laan 2018-04-07 18:47:17 +02:00
commit b2e5fe8b55
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@ -35,6 +35,8 @@ NO_SHA1=1
PREV_COMMIT=""
INITIAL_COMMIT="${CURRENT_COMMIT}"
BRANCH="$(git rev-parse --abbrev-ref HEAD)"
while true; do
if [ "$CURRENT_COMMIT" = $VERIFIED_ROOT ]; then
echo "There is a valid path from \"$INITIAL_COMMIT\" to $VERIFIED_ROOT where all commits are signed!"
@ -123,9 +125,29 @@ while true; do
fi
PARENTS=$(git show -s --format=format:%P "$CURRENT_COMMIT")
for PARENT in $PARENTS; do
PREV_COMMIT="$CURRENT_COMMIT"
CURRENT_COMMIT="$PARENT"
break
done
PARENT1=${PARENTS%% *}
PARENT2=""
if [ "x$PARENT1" != "x$PARENTS" ]; then
PARENTX=${PARENTS#* }
PARENT2=${PARENTX%% *}
if [ "x$PARENT2" != "x$PARENTX" ]; then
echo "Commit $CURRENT_COMMIT is an octopus merge" > /dev/stderr
exit 1
fi
fi
if [ "x$PARENT2" != "x" ]; then
CURRENT_TREE="$(git show --format="%T" "$CURRENT_COMMIT")"
git checkout --force --quiet "$PARENT1"
git merge --no-ff --quiet "$PARENT2" >/dev/null
RECREATED_TREE="$(git show --format="%T" HEAD)"
if [ "$CURRENT_TREE" != "$RECREATED_TREE" ]; then
echo "Merge commit $CURRENT_COMMIT is not clean" > /dev/stderr
git diff "$CURRENT_COMMIT"
git checkout --force --quiet "$BRANCH"
exit 1
fi
git checkout --force --quiet "$BRANCH"
fi
PREV_COMMIT="$CURRENT_COMMIT"
CURRENT_COMMIT="$PARENT1"
done