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#!/bin/sh
#
# use "$1" or something in a real script, this
# just hard-codes it.
#
merge_repo=$1
rm -f .git/MERGE_HEAD .git/ORIG_HEAD
cp .git/HEAD .git/ORIG_HEAD
echo "Getting object database"
rsync -avz --ignore-existing $merge_repo/objects/. ${SHA1_FILE_DIRECTORY:-.git/objects}/.
echo "Getting remote head"
rsync -L $merge_repo/HEAD .git/MERGE_HEAD || exit 1
head=$(cat .git/HEAD)
merge_head=$(cat .git/MERGE_HEAD)
common=$(git-merge-base $head $merge_head)
if [ -z "$common" ]; then
echo "Unable to find common commit between" $merge_head $head
exit 1
fi
# Get the trees associated with those commits
common_tree=$(git-cat-file commit $common | sed 's/tree //;q')
head_tree=$(git-cat-file commit $head | sed 's/tree //;q')
merge_tree=$(git-cat-file commit $merge_head | sed 's/tree //;q')
if [ "$common" == "$merge_head" ]; then
echo "Already up-to-date. Yeeah!"
exit 0
fi
if [ "$common" == "$head" ]; then
echo "Updating from $head to $merge_head."
echo "Destroying all noncommitted data!"
echo "Kill me within 3 seconds.."
sleep 3
git-read-tree -m $merge_tree && git-checkout-cache -f -a && git-update-cache --refresh
echo $merge_head > .git/HEAD
exit 0
fi
echo "Trying to merge $merge_head into $head"
git-read-tree -m $common_tree $head_tree $merge_tree
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
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