38 lines
1.1 KiB
Plaintext
38 lines
1.1 KiB
Plaintext
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#!/bin/sh
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. git-sh-setup-script || die "Not a git archive"
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# We want a clean tree and clean index to be able to revert.
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status=$(git status)
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case "$status" in
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'nothing to commit') ;;
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*)
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echo "$status"
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die "Your working tree is dirty; cannot revert a previous patch." ;;
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esac
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rev=$(git-rev-parse --no-flags --verify --revs-only "$@") &&
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commit=$(git-rev-parse --verify "$rev^0") || exit
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if git-diff-tree -R -M -p $commit | git-apply --index &&
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msg=$(git-rev-list --pretty=oneline --max-count=1 $commit)
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then
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{
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echo "$msg" | sed -e '
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s/^[^ ]* /Revert "/
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s/$/"/'
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echo
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echo "This reverts $commit commit."
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test "$rev" = "$commit" ||
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echo "(original 'git revert' arguments: $@)"
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} | git commit -F -
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else
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# Now why did it fail?
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parents=`git-cat-file commit "$commit" 2>/dev/null |
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sed -ne '/^$/q;/^parent /p' |
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wc -l`
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case $parents in
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0) die "Cannot revert the root commit nor non commit-ish." ;;
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1) die "The patch does not apply." ;;
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*) die "Cannot revert a merge commit." ;;
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esac
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fi
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