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https://github.com/git/git
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9585e40622
The merge-base command acquires a new option, '--all', that causes it to output all the common ancestor candidates. The "git resolve" command then uses it to pick the optimum merge base by picking the one that results in the smallest number of nontrivial merges. Signed-off-by: Junio C Hamano <junkio@cox.net>
103 lines
2.4 KiB
Bash
Executable file
103 lines
2.4 KiB
Bash
Executable file
#!/bin/sh
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#
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# Copyright (c) 2005 Linus Torvalds
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#
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# Resolve two trees.
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#
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. git-sh-setup-script || die "Not a git archive"
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usage () {
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die "git-resolve-script <head> <remote> <merge-message>"
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}
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dropheads() {
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rm -f -- "$GIT_DIR/MERGE_HEAD" \
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"$GIT_DIR/LAST_MERGE" || exit 1
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}
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head=$(git-rev-parse --verify "$1"^0) &&
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merge=$(git-rev-parse --verify "$2"^0) &&
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merge_msg="$3" || usage
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#
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# The remote name is just used for the message,
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# but we do want it.
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#
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if [ -z "$head" -o -z "$merge" -o -z "$merge_msg" ]; then
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usage
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fi
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dropheads
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echo $head > "$GIT_DIR"/ORIG_HEAD
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echo $merge > "$GIT_DIR"/LAST_MERGE
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common=$(git-merge-base $head $merge)
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if [ -z "$common" ]; then
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die "Unable to find common commit between" $merge $head
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fi
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if [ "$common" == "$merge" ]; then
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echo "Already up-to-date. Yeeah!"
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dropheads
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exit 0
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fi
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if [ "$common" == "$head" ]; then
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echo "Updating from $head to $merge."
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git-read-tree -u -m $head $merge || exit 1
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echo $merge > "$GIT_DIR"/HEAD
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git-diff-tree -p $head $merge | git-apply --stat
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dropheads
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exit 0
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fi
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# Find an optimum merge base if there are more than one candidates.
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LF='
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'
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common=$(git-merge-base -a $head $merge)
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case "$common" in
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?*"$LF"?*)
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echo "Trying to find the optimum merge base."
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G=.tmp-index$$
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best=
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best_cnt=-1
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for c in $common
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do
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rm -f $G
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GIT_INDEX_FILE=$G git-read-tree -m $c $head $merge \
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2>/dev/null || continue
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# Count the paths that are unmerged.
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cnt=`GIT_INDEX_FILE=$G git-ls-files --unmerged | wc -l`
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if test $best_cnt -le 0 -o $cnt -le $best_cnt
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then
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best=$c
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best_cnt=$cnt
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if test "$best_cnt" -eq 0
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then
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# Cannot do any better than all trivial merge.
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break
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fi
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fi
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done
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rm -f $G
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common="$best"
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esac
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echo "Trying to merge $merge into $head using $common."
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git-update-cache --refresh 2>/dev/null
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git-read-tree -u -m $common $head $merge || exit 1
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result_tree=$(git-write-tree 2> /dev/null)
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if [ $? -ne 0 ]; then
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echo "Simple merge failed, trying Automatic merge"
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git-merge-cache -o git-merge-one-file-script -a
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if [ $? -ne 0 ]; then
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echo $merge > "$GIT_DIR"/MERGE_HEAD
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die "Automatic merge failed, fix up by hand"
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fi
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result_tree=$(git-write-tree) || exit 1
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fi
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result_commit=$(echo "$merge_msg" | git-commit-tree $result_tree -p $head -p $merge)
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echo "Committed merge $result_commit"
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echo $result_commit > "$GIT_DIR"/HEAD
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git-diff-tree -p $head $result_commit | git-apply --stat
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dropheads
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