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#!/bin/sh
#
# Copyright (c) 2005 Junio C Hamano.
#

usage="usage: $0 "'<upstream> [<head>]

Uses output from git-cherry to rebase local commits to the new head of
upstream tree.'

: ${GIT_DIR=.git}

case "$#" in
1) linus=`git-rev-parse "$1"` &&
   junio=`git-rev-parse HEAD` || exit
   ;;
2) linus=`git-rev-parse "$1"` &&
   junio=`git-rev-parse "$2"` || exit
   ;;
*) echo >&2 "$usage"; exit 1 ;;
esac

git-read-tree -m -u $junio $linus &&
echo "$linus" >"$GIT_DIR/HEAD" || exit

tmp=.rebase-tmp$$
fail=$tmp-fail
trap "rm -rf $tmp-*" 0 1 2 3 15

>$fail

git-cherry $linus $junio |
while read sign commit
do
	case "$sign" in
	-) continue ;;
	esac
	S=`cat "$GIT_DIR/HEAD"` &&
        GIT_EXTERNAL_DIFF=git-apply-patch-script git-diff-tree -p $commit &&
	git-commit-script -m "$commit" || {
		echo $commit >>$fail
		git-read-tree --reset -u $S
	}
done
if test -s $fail
then
	echo Some commits could not be rebased, check by hand:
	cat $fail
fi