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#!/bin/sh
#
# Resolve two trees.
#
head="$1"
merge="$2"
merge_repo="$3"

rm -f .git/MERGE_HEAD .git/ORIG_HEAD
echo $head > .git/ORIG_HEAD
echo $merge > .git/MERGE_HEAD

#
# The remote name is just used for the message,
# but we do want it.
#
if [ "$merge_repo" == "" ]; then
	echo "git-resolve-script <head> <remote> <merge-repo-name>"
	exit 1
fi

common=$(git-merge-base $head $merge)
if [ -z "$common" ]; then
	echo "Unable to find common commit between" $merge $head
	exit 1
fi

if [ "$common" == "$merge" ]; then
	echo "Already up-to-date. Yeeah!"
	exit 0
fi
if [ "$common" == "$head" ]; then
	echo "Updating from $head to $merge."
	echo "Destroying all noncommitted data!"
	echo "Kill me within 3 seconds.."
	sleep 3
	git-read-tree -m $merge && git-checkout-cache -f -a && git-update-cache --refresh
	echo $merge > .git/HEAD
	git-diff-tree -p ORIG_HEAD HEAD | diffstat -p1
	exit 0
fi
echo "Trying to merge $merge into $head"
git-read-tree -m $common $head $merge
merge_msg="Merge of $merge_repo"
result_tree=$(git-write-tree  2> /dev/null)
if [ $? -ne 0 ]; then
	echo "Simple merge failed, trying Automatic merge"
	git-merge-cache git-merge-one-file-script -a
	merge_msg="Automatic merge of $merge_repo"
	result_tree=$(git-write-tree) || exit 1
fi
result_commit=$(echo "$merge_msg" | git-commit-tree $result_tree -p $head -p $merge_head)
echo "Committed merge $result_commit"
echo $result_commit > .git/HEAD
git-checkout-cache -f -a && git-update-cache --refresh
git-diff-tree -p ORIG_HEAD HEAD | diffstat -p1