diff options
Diffstat (limited to 'git-applypatch.sh')
| -rwxr-xr-x | git-applypatch.sh | 73 |
1 files changed, 72 insertions, 1 deletions
diff --git a/git-applypatch.sh b/git-applypatch.sh index 14635d9..66fd19a 100755 --- a/git-applypatch.sh +++ b/git-applypatch.sh @@ -22,6 +22,8 @@ query_apply=.dotest/.query_apply ## if this file exists. keep_subject=.dotest/.keep_subject +## We do not attempt the 3-way merge fallback unless this file exists. +fall_back_3way=.dotest/.3way MSGFILE=$1 PATCHFILE=$2 @@ -102,10 +104,79 @@ echo Applying "'$SUBJECT'" echo git-apply --index "$PATCHFILE" || { + + # git-apply exits with status 1 when the patch does not apply, + # but it die()s with other failures, most notably upon corrupt + # patch. In the latter case, there is no point to try applying + # it to another tree and do 3-way merge. + test $? = 1 || exit 1 + + test -f "$fall_back_3way" || exit 1 + # Here if we know which revision the patch applies to, # we create a temporary working tree and index, apply the # patch, and attempt 3-way merge with the resulting tree. - exit 1 + + O_OBJECT=`cd "$GIT_OBJECT_DIRECTORY" && pwd` + rm -fr .patch-merge-* + + ( + N=10 + + # if the patch records the base tree... + sed -ne ' + /^diff /q + /^applies-to: \([0-9a-f]*\)$/{ + s//\1/p + q + } + ' "$PATCHFILE" + + # or hoping the patch is against our recent commits... + git-rev-list --max-count=$N HEAD + + # or hoping the patch is against known tags... + git-ls-remote --tags . + ) | + while read base junk + do + # Try it if we have it as a tree. + git-cat-file tree "$base" >/dev/null 2>&1 || continue + + rm -fr .patch-merge-tmp-* && + mkdir .patch-merge-tmp-dir || break + ( + cd .patch-merge-tmp-dir && + GIT_INDEX_FILE=../.patch-merge-tmp-index && + GIT_OBJECT_DIRECTORY="$O_OBJECT" && + export GIT_INDEX_FILE GIT_OBJECT_DIRECTORY && + git-read-tree "$base" && + git-apply --index && + mv ../.patch-merge-tmp-index ../.patch-merge-index && + echo "$base" >../.patch-merge-base + ) <"$PATCHFILE" 2>/dev/null && break + done + + test -f .patch-merge-index && + his_tree=$(GIT_INDEX_FILE=.patch-merge-index git-write-tree) && + orig_tree=$(cat .patch-merge-base) && + rm -fr .patch-merge-* || exit 1 + + echo Falling back to patching base and 3-way merge using $orig_tree... + + # This is not so wrong. Depending on which base we picked, + # orig_tree may be wildly different from ours, but his_tree + # has the same set of wildly different changes in parts the + # patch did not touch, so resolve ends up cancelling them, + # saying that we reverted all those changes. + + if git-merge-resolve $orig_tree -- HEAD $his_tree + then + echo Done. + else + echo Failed to merge in the changes. + exit 1 + fi } if test -x "$GIT_DIR"/hooks/pre-applypatch |