bf7960eb51
This uses the git-update-ref command in scripts for safer updates. Also places where we used to read HEAD ref by using "cat" were fixed to use git-rev-parse. This will matter when we start using symbolic references. Signed-off-by: Junio C Hamano <junkio@cox.net>
105 lines
2.3 KiB
Bash
Executable File
105 lines
2.3 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 || die "Not a git archive"
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usage () {
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die "git-resolve <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 $head
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fi
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case "$common" in
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"$merge")
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echo "Already up-to-date. Yeeah!"
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dropheads
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exit 0
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;;
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"$head")
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echo "Updating from $head to $merge."
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git-read-tree -u -m $head $merge || exit 1
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git-update-ref HEAD "$merge" "$head"
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git-diff-tree -p $head $merge | git-apply --stat
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dropheads
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exit 0
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;;
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esac
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# Find an optimum merge base if there are more than one candidates.
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LF='
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'
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common=$(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-index --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-index -o git-merge-one-file -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 $result_commit"
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git-update-ref HEAD "$result_commit" "$head"
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git-diff-tree -p $head $result_commit | git-apply --stat
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dropheads
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