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