git-rebase.sh - git - Git at Google

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

 USAGE='[--interactive | -i] [-v] [--onto <newbase>] <upstream> [<branch>]'
 LONG_USAGE='git-rebase replaces <branch> with a new branch of the
 same name.  When the --onto option is provided the new branch starts
 out with a HEAD equal to <newbase>, otherwise it is equal to <upstream>
 It then attempts to create a new commit for each commit from the original
 <branch> that does not exist in the <upstream> branch.

 It is possible that a merge failure will prevent this process from being
 completely automatic.  You will have to resolve any such merge failure
 and run git rebase --continue.  Another option is to bypass the commit
 that caused the merge failure with git rebase --skip.  To restore the
 original <branch> and remove the .dotest working files, use the command
 git rebase --abort instead.

 Note that if <branch> is not specified on the command line, the
 currently checked out branch is used.

 Example:       git-rebase master~1 topic

         A---B---C topic                   A'\''--B'\''--C'\'' topic
        /                   -->           /
   D---E---F---G master          D---E---F---G master
 '

 SUBDIRECTORY_OK=Yes
 OPTIONS_SPEC=
 . git-sh-setup
 set_reflog_action rebase
 require_work_tree
 cd_to_toplevel

 RESOLVEMSG="
 When you have resolved this problem run \"git rebase --continue\".
 If you would prefer to skip this patch, instead run \"git rebase --skip\".
 To restore the original branch and stop rebasing run \"git rebase --abort\".
 "
 unset newbase
 strategy=recursive
 do_merge=
 dotest=$GIT_DIR/.dotest-merge
 prec=4
 verbose=
 git_am_opt=

 continue_merge () {
 	test -n "$prev_head" || die "prev_head must be defined"
 	test -d "$dotest" || die "$dotest directory does not exist"

 	unmerged=$(git ls-files -u)
 	if test -n "$unmerged"
 	then
 		echo "You still have unmerged paths in your index"
 		echo "did you forget to use git add?"
 		die "$RESOLVEMSG"
 	fi

 	cmt=`cat "$dotest/current"`
 	if ! git diff-index --quiet --ignore-submodules HEAD --
 	then
 		if ! git commit --no-verify -C "$cmt"
 		then
 			echo "Commit failed, please do not call \"git commit\""
 			echo "directly, but instead do one of the following: "
 			die "$RESOLVEMSG"
 		fi
 		printf "Committed: %0${prec}d " $msgnum
 	else
 		printf "Already applied: %0${prec}d " $msgnum
 	fi
 	git rev-list --pretty=oneline -1 "$cmt" | sed -e 's/^[^ ]* //'

 	prev_head=`git rev-parse HEAD^0`
 	# save the resulting commit so we can read-tree on it later
 	echo "$prev_head" > "$dotest/prev_head"

 	# onto the next patch:
 	msgnum=$(($msgnum + 1))
 	echo "$msgnum" >"$dotest/msgnum"
 }

 call_merge () {
 	cmt="$(cat "$dotest/cmt.$1")"
 	echo "$cmt" > "$dotest/current"
 	hd=$(git rev-parse --verify HEAD)
 	cmt_name=$(git symbolic-ref HEAD 2> /dev/null || echo HEAD)
 	msgnum=$(cat "$dotest/msgnum")
 	end=$(cat "$dotest/end")
 	eval GITHEAD_$cmt='"${cmt_name##refs/heads/}~$(($end - $msgnum))"'
 	eval GITHEAD_$hd='$(cat "$dotest/onto_name")'
 	export GITHEAD_$cmt GITHEAD_$hd
 	git-merge-$strategy "$cmt^" -- "$hd" "$cmt"
 	rv=$?
 	case "$rv" in
 	0)
 		unset GITHEAD_$cmt GITHEAD_$hd
 		return
 		;;
 	1)
 		git rerere
 		die "$RESOLVEMSG"
 		;;
 	2)
 		echo "Strategy: $rv $strategy failed, try another" 1>&2
 		die "$RESOLVEMSG"
 		;;
 	*)
 		die "Unknown exit code ($rv) from command:" \
 			"git-merge-$strategy $cmt^ -- HEAD $cmt"
 		;;
 	esac
 }

 move_to_original_branch () {
 	test -z "$head_name" &&
 		head_name="$(cat "$dotest"/head-name)" &&
 		onto="$(cat "$dotest"/onto)" &&
 		orig_head="$(cat "$dotest"/orig-head)"
 	case "$head_name" in
 	refs/*)
 		message="rebase finished: $head_name onto $onto"
 		git update-ref -m "$message" \
 			$head_name $(git rev-parse HEAD) $orig_head &&
 		git symbolic-ref HEAD $head_name ||
 		die "Could not move back to $head_name"
 		;;
 	esac
 }

 finish_rb_merge () {
 	move_to_original_branch
 	rm -r "$dotest"
 	echo "All done."
 }

 is_interactive () {
 	test -f "$dotest"/interactive ||
 	while :; do case $#,"$1" in 0,|*,-i|*,--interactive) break ;; esac
 		shift
 	done && test -n "$1"
 }

 is_interactive "$@" && exec git-rebase--interactive "$@"

 while test $# != 0
 do
 	case "$1" in
 	--continue)
 		git diff-files --quiet --ignore-submodules || {
 			echo "You must edit all merge conflicts and then"
 			echo "mark them as resolved using git add"
 			exit 1
 		}
 		if test -d "$dotest"
 		then
 			prev_head=$(cat "$dotest/prev_head")
 			end=$(cat "$dotest/end")
 			msgnum=$(cat "$dotest/msgnum")
 			onto=$(cat "$dotest/onto")
 			continue_merge
 			while test "$msgnum" -le "$end"
 			do
 				call_merge "$msgnum"
 				continue_merge
 			done
 			finish_rb_merge
 			exit
 		fi
 		head_name=$(cat .dotest/head-name) &&
 		onto=$(cat .dotest/onto) &&
 		orig_head=$(cat .dotest/orig-head) &&
 		git am --resolved --3way --resolvemsg="$RESOLVEMSG" &&
 		move_to_original_branch
 		exit
 		;;
 	--skip)
 		git reset --hard HEAD || exit $?
 		if test -d "$dotest"
 		then
 			git rerere clear
 			prev_head=$(cat "$dotest/prev_head")
 			end=$(cat "$dotest/end")
 			msgnum=$(cat "$dotest/msgnum")
 			msgnum=$(($msgnum + 1))
 			onto=$(cat "$dotest/onto")
 			while test "$msgnum" -le "$end"
 			do
 				call_merge "$msgnum"
 				continue_merge
 			done
 			finish_rb_merge
 			exit
 		fi
 		head_name=$(cat .dotest/head-name) &&
 		onto=$(cat .dotest/onto) &&
 		orig_head=$(cat .dotest/orig-head) &&
 		git am -3 --skip --resolvemsg="$RESOLVEMSG" &&
 		move_to_original_branch
 		exit
 		;;
 	--abort)
 		git rerere clear
 		if test -d "$dotest"
 		then
 			move_to_original_branch
 		elif test -d .dotest
 		then
 			dotest=.dotest
 			move_to_original_branch
 		else
 			die "No rebase in progress?"
 		fi
 		git reset --hard $(cat "$dotest/orig-head")
 		rm -r "$dotest"
 		exit
 		;;
 	--onto)
 		test 2 -le "$#" || usage
 		newbase="$2"
 		shift
 		;;
 	-M|-m|--m|--me|--mer|--merg|--merge)
 		do_merge=t
 		;;
 	-s=*|--s=*|--st=*|--str=*|--stra=*|--strat=*|--strate=*|\
 		--strateg=*|--strategy=*|\
 	-s|--s|--st|--str|--stra|--strat|--strate|--strateg|--strategy)
 		case "$#,$1" in
 		*,*=*)
 			strategy=`expr "z$1" : 'z-[^=]*=\(.*\)'` ;;
 		1,*)
 			usage ;;
 		*)
 			strategy="$2"
 			shift ;;
 		esac
 		do_merge=t
 		;;
 	-v|--verbose)
 		verbose=t
 		;;
 	--whitespace=*)
 		git_am_opt="$git_am_opt $1"
 		;;
 	-C*)
 		git_am_opt="$git_am_opt $1"
 		;;
 	-*)
 		usage
 		;;
 	*)
 		break
 		;;
 	esac
 	shift
 done

 # Make sure we do not have .dotest
 if test -z "$do_merge"
 then
 	if mkdir .dotest
 	then
 		rmdir .dotest
 	else
 		echo >&2 '
 It seems that I cannot create a .dotest directory, and I wonder if you
 are in the middle of patch application or another rebase.  If that is not
 the case, please rm -fr .dotest and run me again.  I am stopping in case
 you still have something valuable there.'
 		exit 1
 	fi
 else
 	if test -d "$dotest"
 	then
 		die "previous dotest directory $dotest still exists." \
 			'try git-rebase < --continue | --abort >'
 	fi
 fi

 # The tree must be really really clean.
 git update-index --ignore-submodules --refresh || exit
 diff=$(git diff-index --cached --name-status -r --ignore-submodules HEAD --)
 case "$diff" in
 ?*)	echo "cannot rebase: your index is not up-to-date"
 	echo "$diff"
 	exit 1
 	;;
 esac

 # The upstream head must be given.  Make sure it is valid.
 upstream_name="$1"
 upstream=`git rev-parse --verify "${upstream_name}^0"` ||
     die "invalid upstream $upstream_name"

 # Make sure the branch to rebase onto is valid.
 onto_name=${newbase-"$upstream_name"}
 onto=$(git rev-parse --verify "${onto_name}^0") || exit

 # If a hook exists, give it a chance to interrupt
 if test -x "$GIT_DIR/hooks/pre-rebase"
 then
 	"$GIT_DIR/hooks/pre-rebase" ${1+"$@"} || {
 		echo >&2 "The pre-rebase hook refused to rebase."
 		exit 1
 	}
 fi

 # If the branch to rebase is given, that is the branch we will rebase
 # $branch_name -- branch being rebased, or HEAD (already detached)
 # $orig_head -- commit object name of tip of the branch before rebasing
 # $head_name -- refs/heads/<that-branch> or "detached HEAD"
 switch_to=
 case "$#" in
 2)
 	# Is it "rebase other $branchname" or "rebase other $commit"?
 	branch_name="$2"
 	switch_to="$2"

 	if git show-ref --verify --quiet -- "refs/heads/$2" &&
 	   branch=$(git rev-parse --verify "refs/heads/$2" 2>/dev/null)
 	then
 		head_name="refs/heads/$2"
 	elif branch=$(git rev-parse --verify "$2" 2>/dev/null)
 	then
 		head_name="detached HEAD"
 	else
 		usage
 	fi
 	;;
 *)
 	# Do not need to switch branches, we are already on it.
 	if branch_name=`git symbolic-ref -q HEAD`
 	then
 		head_name=$branch_name
 		branch_name=`expr "z$branch_name" : 'zrefs/heads/\(.*\)'`
 	else
 		head_name="detached HEAD"
 		branch_name=HEAD ;# detached
 	fi
 	branch=$(git rev-parse --verify "${branch_name}^0") || exit
 	;;
 esac
 orig_head=$branch

 # Now we are rebasing commits $upstream..$branch on top of $onto

 # Check if we are already based on $onto with linear history,
 # but this should be done only when upstream and onto are the same.
 mb=$(git merge-base "$onto" "$branch")
 if test "$upstream" = "$onto" && test "$mb" = "$onto" &&
 	# linear history?
 	! (git rev-list --parents "$onto".."$branch" | grep " .* ") > /dev/null
 then
 	# Lazily switch to the target branch if needed...
 	test -z "$switch_to" || git checkout "$switch_to"
 	echo >&2 "Current branch $branch_name is up to date."
 	exit 0
 fi

 if test -n "$verbose"
 then
 	echo "Changes from $mb to $onto:"
 	# We want color (if set), but no pager
 	GIT_PAGER='' git diff --stat --summary "$mb" "$onto"
 fi

 # Detach HEAD and reset the tree
 echo "First, rewinding head to replay your work on top of it..."
 git checkout "$onto^0" >/dev/null 2>&1 ||
 	die "could not detach HEAD"
 # git reset --hard "$onto^0"

 # If the $onto is a proper descendant of the tip of the branch, then
 # we just fast forwarded.
 if test "$mb" = "$branch"
 then
 	echo >&2 "Fast-forwarded $branch_name to $onto_name."
 	move_to_original_branch
 	exit 0
 fi

 if test -z "$do_merge"
 then
 	git format-patch -k --stdout --full-index --ignore-if-in-upstream \
 		"$upstream..$orig_head" |
 	git am $git_am_opt --rebasing --resolvemsg="$RESOLVEMSG" &&
 	move_to_original_branch
 	ret=$?
 	test 0 != $ret -a -d .dotest &&
 		echo $head_name > .dotest/head-name &&
 		echo $onto > .dotest/onto &&
 		echo $orig_head > .dotest/orig-head
 	exit $ret
 fi

 # start doing a rebase with git-merge
 # this is rename-aware if the recursive (default) strategy is used

 mkdir -p "$dotest"
 echo "$onto" > "$dotest/onto"
 echo "$onto_name" > "$dotest/onto_name"
 prev_head=$orig_head
 echo "$prev_head" > "$dotest/prev_head"
 echo "$orig_head" > "$dotest/orig-head"
 echo "$head_name" > "$dotest/head-name"

 msgnum=0
 for cmt in `git rev-list --reverse --no-merges "$upstream..$orig_head"`
 do
 	msgnum=$(($msgnum + 1))
 	echo "$cmt" > "$dotest/cmt.$msgnum"
 done

 echo 1 >"$dotest/msgnum"
 echo $msgnum >"$dotest/end"

 end=$msgnum
 msgnum=1

 while test "$msgnum" -le "$end"
 do
 	call_merge "$msgnum"
 	continue_merge
 done

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

	USAGE='[--interactive \| -i] [-v] [--onto <newbase>] <upstream> [<branch>]'
	LONG_USAGE='git-rebase replaces <branch> with a new branch of the
	same name. When the --onto option is provided the new branch starts
	out with a HEAD equal to <newbase>, otherwise it is equal to <upstream>
	It then attempts to create a new commit for each commit from the original
	<branch> that does not exist in the <upstream> branch.

	It is possible that a merge failure will prevent this process from being
	completely automatic. You will have to resolve any such merge failure
	and run git rebase --continue. Another option is to bypass the commit
	that caused the merge failure with git rebase --skip. To restore the
	original <branch> and remove the .dotest working files, use the command
	git rebase --abort instead.

	Note that if <branch> is not specified on the command line, the
	currently checked out branch is used.

	Example: git-rebase master~1 topic

	A---B---C topic A'\''--B'\''--C'\'' topic
	/ --> /
	D---E---F---G master D---E---F---G master
	'

	SUBDIRECTORY_OK=Yes
	OPTIONS_SPEC=
	. git-sh-setup
	set_reflog_action rebase
	require_work_tree
	cd_to_toplevel

	RESOLVEMSG="
	When you have resolved this problem run \"git rebase --continue\".
	If you would prefer to skip this patch, instead run \"git rebase --skip\".
	To restore the original branch and stop rebasing run \"git rebase --abort\".
	"
	unset newbase
	strategy=recursive
	do_merge=
	dotest=$GIT_DIR/.dotest-merge
	prec=4
	verbose=
	git_am_opt=

	continue_merge () {
	test -n "$prev_head" \|\| die "prev_head must be defined"
	test -d "$dotest" \|\| die "$dotest directory does not exist"

	unmerged=$(git ls-files -u)
	if test -n "$unmerged"
	then
	echo "You still have unmerged paths in your index"
	echo "did you forget to use git add?"
	die "$RESOLVEMSG"
	fi

	cmt=`cat "$dotest/current"`
	if ! git diff-index --quiet --ignore-submodules HEAD --
	then
	if ! git commit --no-verify -C "$cmt"
	then
	echo "Commit failed, please do not call \"git commit\""
	echo "directly, but instead do one of the following: "
	die "$RESOLVEMSG"
	fi
	printf "Committed: %0${prec}d " $msgnum
	else
	printf "Already applied: %0${prec}d " $msgnum
	fi
	git rev-list --pretty=oneline -1 "$cmt" \| sed -e 's/^[^ ]* //'

	prev_head=`git rev-parse HEAD^0`
	# save the resulting commit so we can read-tree on it later
	echo "$prev_head" > "$dotest/prev_head"

	# onto the next patch:
	msgnum=$(($msgnum + 1))
	echo "$msgnum" >"$dotest/msgnum"
	}

	call_merge () {
	cmt="$(cat "$dotest/cmt.$1")"
	echo "$cmt" > "$dotest/current"
	hd=$(git rev-parse --verify HEAD)
	cmt_name=$(git symbolic-ref HEAD 2> /dev/null \|\| echo HEAD)
	msgnum=$(cat "$dotest/msgnum")
	end=$(cat "$dotest/end")
	eval GITHEAD_$cmt='"${cmt_name##refs/heads/}~$(($end - $msgnum))"'
	eval GITHEAD_$hd='$(cat "$dotest/onto_name")'
	export GITHEAD_$cmt GITHEAD_$hd
	git-merge-$strategy "$cmt^" -- "$hd" "$cmt"
	rv=$?
	case "$rv" in
	0)
	unset GITHEAD_$cmt GITHEAD_$hd
	return
	;;
	1)
	git rerere
	die "$RESOLVEMSG"
	;;
	2)
	echo "Strategy: $rv $strategy failed, try another" 1>&2
	die "$RESOLVEMSG"
	;;
	*)
	die "Unknown exit code ($rv) from command:" \
	"git-merge-$strategy $cmt^ -- HEAD $cmt"
	;;
	esac
	}

	move_to_original_branch () {
	test -z "$head_name" &&
	head_name="$(cat "$dotest"/head-name)" &&
	onto="$(cat "$dotest"/onto)" &&
	orig_head="$(cat "$dotest"/orig-head)"
	case "$head_name" in
	refs/*)
	message="rebase finished: $head_name onto $onto"
	git update-ref -m "$message" \
	$head_name $(git rev-parse HEAD) $orig_head &&
	git symbolic-ref HEAD $head_name \|\|
	die "Could not move back to $head_name"
	;;
	esac
	}

	finish_rb_merge () {
	move_to_original_branch
	rm -r "$dotest"
	echo "All done."
	}

	is_interactive () {
	test -f "$dotest"/interactive \|\|
	while :; do case $#,"$1" in 0,\|,-i\|,--interactive) break ;; esac
	shift
	done && test -n "$1"
	}

	is_interactive "$@" && exec git-rebase--interactive "$@"

	while test $# != 0
	do
	case "$1" in
	--continue)
	git diff-files --quiet --ignore-submodules \|\| {
	echo "You must edit all merge conflicts and then"
	echo "mark them as resolved using git add"
	exit 1
	}
	if test -d "$dotest"
	then
	prev_head=$(cat "$dotest/prev_head")
	end=$(cat "$dotest/end")
	msgnum=$(cat "$dotest/msgnum")
	onto=$(cat "$dotest/onto")
	continue_merge
	while test "$msgnum" -le "$end"
	do
	call_merge "$msgnum"
	continue_merge
	done
	finish_rb_merge
	exit
	fi
	head_name=$(cat .dotest/head-name) &&
	onto=$(cat .dotest/onto) &&
	orig_head=$(cat .dotest/orig-head) &&
	git am --resolved --3way --resolvemsg="$RESOLVEMSG" &&
	move_to_original_branch
	exit
	;;
	--skip)
	git reset --hard HEAD \|\| exit $?
	if test -d "$dotest"
	then
	git rerere clear
	prev_head=$(cat "$dotest/prev_head")
	end=$(cat "$dotest/end")
	msgnum=$(cat "$dotest/msgnum")
	msgnum=$(($msgnum + 1))
	onto=$(cat "$dotest/onto")
	while test "$msgnum" -le "$end"
	do
	call_merge "$msgnum"
	continue_merge
	done
	finish_rb_merge
	exit
	fi
	head_name=$(cat .dotest/head-name) &&
	onto=$(cat .dotest/onto) &&
	orig_head=$(cat .dotest/orig-head) &&
	git am -3 --skip --resolvemsg="$RESOLVEMSG" &&
	move_to_original_branch
	exit
	;;
	--abort)
	git rerere clear
	if test -d "$dotest"
	then
	move_to_original_branch
	elif test -d .dotest
	then
	dotest=.dotest
	move_to_original_branch
	else
	die "No rebase in progress?"
	fi
	git reset --hard $(cat "$dotest/orig-head")
	rm -r "$dotest"
	exit
	;;
	--onto)
	test 2 -le "$#" \|\| usage
	newbase="$2"
	shift
	;;
	-M\|-m\|--m\|--me\|--mer\|--merg\|--merge)
	do_merge=t
	;;
	-s=\|--s=\|--st=\|--str=\|--stra=\|--strat=\|--strate=*\|\
	--strateg=\|--strategy=\|\
	-s\|--s\|--st\|--str\|--stra\|--strat\|--strate\|--strateg\|--strategy)
	case "$#,$1" in
	,=*)
	strategy=`expr "z$1" : 'z-[^=]=\(.\)'` ;;
	1,*)
	usage ;;
	*)
	strategy="$2"
	shift ;;
	esac
	do_merge=t
	;;
	-v\|--verbose)
	verbose=t
	;;
	--whitespace=*)
	git_am_opt="$git_am_opt $1"
	;;
	-C*)
	git_am_opt="$git_am_opt $1"
	;;
	-*)
	usage
	;;
	*)
	break
	;;
	esac
	shift
	done

	# Make sure we do not have .dotest
	if test -z "$do_merge"
	then
	if mkdir .dotest
	then
	rmdir .dotest
	else
	echo >&2 '
	It seems that I cannot create a .dotest directory, and I wonder if you
	are in the middle of patch application or another rebase. If that is not
	the case, please rm -fr .dotest and run me again. I am stopping in case
	you still have something valuable there.'
	exit 1
	fi
	else
	if test -d "$dotest"
	then
	die "previous dotest directory $dotest still exists." \
	'try git-rebase < --continue \| --abort >'
	fi
	fi

	# The tree must be really really clean.
	git update-index --ignore-submodules --refresh \|\| exit
	diff=$(git diff-index --cached --name-status -r --ignore-submodules HEAD --)
	case "$diff" in
	?*) echo "cannot rebase: your index is not up-to-date"
	echo "$diff"
	exit 1
	;;
	esac

	# The upstream head must be given. Make sure it is valid.
	upstream_name="$1"
	upstream=`git rev-parse --verify "${upstream_name}^0"` \|\|
	die "invalid upstream $upstream_name"

	# Make sure the branch to rebase onto is valid.
	onto_name=${newbase-"$upstream_name"}
	onto=$(git rev-parse --verify "${onto_name}^0") \|\| exit

	# If a hook exists, give it a chance to interrupt
	if test -x "$GIT_DIR/hooks/pre-rebase"
	then
	"$GIT_DIR/hooks/pre-rebase" ${1+"$@"} \|\| {
	echo >&2 "The pre-rebase hook refused to rebase."
	exit 1
	}
	fi

	# If the branch to rebase is given, that is the branch we will rebase
	# $branch_name -- branch being rebased, or HEAD (already detached)
	# $orig_head -- commit object name of tip of the branch before rebasing
	# $head_name -- refs/heads/<that-branch> or "detached HEAD"
	switch_to=
	case "$#" in
	2)
	# Is it "rebase other $branchname" or "rebase other $commit"?
	branch_name="$2"
	switch_to="$2"

	if git show-ref --verify --quiet -- "refs/heads/$2" &&
	branch=$(git rev-parse --verify "refs/heads/$2" 2>/dev/null)
	then
	head_name="refs/heads/$2"
	elif branch=$(git rev-parse --verify "$2" 2>/dev/null)
	then
	head_name="detached HEAD"
	else
	usage
	fi
	;;
	*)
	# Do not need to switch branches, we are already on it.
	if branch_name=`git symbolic-ref -q HEAD`
	then
	head_name=$branch_name
	branch_name=`expr "z$branch_name" : 'zrefs/heads/\(.*\)'`
	else
	head_name="detached HEAD"
	branch_name=HEAD ;# detached
	fi
	branch=$(git rev-parse --verify "${branch_name}^0") \|\| exit
	;;
	esac
	orig_head=$branch

	# Now we are rebasing commits $upstream..$branch on top of $onto

	# Check if we are already based on $onto with linear history,
	# but this should be done only when upstream and onto are the same.
	mb=$(git merge-base "$onto" "$branch")
	if test "$upstream" = "$onto" && test "$mb" = "$onto" &&
	# linear history?
	! (git rev-list --parents "$onto".."$branch" \| grep " .* ") > /dev/null
	then
	# Lazily switch to the target branch if needed...
	test -z "$switch_to" \|\| git checkout "$switch_to"
	echo >&2 "Current branch $branch_name is up to date."
	exit 0
	fi

	if test -n "$verbose"
	then
	echo "Changes from $mb to $onto:"
	# We want color (if set), but no pager
	GIT_PAGER='' git diff --stat --summary "$mb" "$onto"
	fi

	# Detach HEAD and reset the tree
	echo "First, rewinding head to replay your work on top of it..."
	git checkout "$onto^0" >/dev/null 2>&1 \|\|
	die "could not detach HEAD"
	# git reset --hard "$onto^0"

	# If the $onto is a proper descendant of the tip of the branch, then
	# we just fast forwarded.
	if test "$mb" = "$branch"
	then
	echo >&2 "Fast-forwarded $branch_name to $onto_name."
	move_to_original_branch
	exit 0
	fi

	if test -z "$do_merge"
	then
	git format-patch -k --stdout --full-index --ignore-if-in-upstream \
	"$upstream..$orig_head" \|
	git am $git_am_opt --rebasing --resolvemsg="$RESOLVEMSG" &&
	move_to_original_branch
	ret=$?
	test 0 != $ret -a -d .dotest &&
	echo $head_name > .dotest/head-name &&
	echo $onto > .dotest/onto &&
	echo $orig_head > .dotest/orig-head
	exit $ret
	fi

	# start doing a rebase with git-merge
	# this is rename-aware if the recursive (default) strategy is used

	mkdir -p "$dotest"
	echo "$onto" > "$dotest/onto"
	echo "$onto_name" > "$dotest/onto_name"
	prev_head=$orig_head
	echo "$prev_head" > "$dotest/prev_head"
	echo "$orig_head" > "$dotest/orig-head"
	echo "$head_name" > "$dotest/head-name"

	msgnum=0
	for cmt in `git rev-list --reverse --no-merges "$upstream..$orig_head"`
	do
	msgnum=$(($msgnum + 1))
	echo "$cmt" > "$dotest/cmt.$msgnum"
	done

	echo 1 >"$dotest/msgnum"
	echo $msgnum >"$dotest/end"

	end=$msgnum
	msgnum=1

	while test "$msgnum" -le "$end"
	do
	call_merge "$msgnum"
	continue_merge
	done

	finish_rb_merge