path: root/git-rebase.sh

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

USAGE='[--interactive | -i] [-v] [--force-rebase | -f] [--no-ff] [--onto <newbase>] (<upstream>|--root) [<branch>] [--quiet | -q]'
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 .git/rebase-apply 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

LF='
'
OK_TO_SKIP_PRE_REBASE=
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="$GIT_DIR"/rebase-merge
prec=4
verbose=
diffstat=$(git config --bool rebase.stat)
git_am_opt=
rebase_root=
force_rebase=
allow_rerere_autoupdate=

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 "$RESOLVEMSG"
		fi
		if test -z "$GIT_QUIET"
		then
			printf "Committed: %0${prec}d " $msgnum
		fi
		echo "$cmt $(git rev-parse HEAD^0)" >> "$dotest/rewritten"
	else
		if test -z "$GIT_QUIET"
		then
			printf "Already applied: %0${prec}d " $msgnum
		fi
	fi
	test -z "$GIT_QUIET" &&
	GIT_PAGER='' git log --format=%s -1 "$cmt"

	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
	if test -n "$GIT_QUIET"
	then
		export GIT_MERGE_VERBOSITY=1
	fi
	git-merge-$strategy "$cmt^" -- "$hd" "$cmt"
	rv=$?
	case "$rv" in
	0)
		unset GITHEAD_$cmt GITHEAD_$hd
		return
		;;
	1)
		git rerere $allow_rerere_autoupdate
		die "$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
	git notes copy --for-rewrite=rebase < "$dotest"/rewritten
	if test -x "$GIT_DIR"/hooks/post-rewrite &&
		test -s "$dotest"/rewritten; then
		"$GIT_DIR"/hooks/post-rewrite rebase < "$dotest"/rewritten
	fi
	rm -r "$dotest"
	say All done.
}

is_interactive () {
	while test $# != 0
	do
		case "$1" in
			-i|--interactive)
				interactive_rebase=explicit
				break
			;;
			-p|--preserve-merges)
				interactive_rebase=implied
			;;
		esac
		shift
	done

	if [ "$interactive_rebase" = implied ]; then
		GIT_EDITOR=:
		export GIT_EDITOR
	fi

	test -n "$interactive_rebase" || test -f "$dotest"/interactive
}

run_pre_rebase_hook () {
	if test -z "$OK_TO_SKIP_PRE_REBASE" &&
	   test -x "$GIT_DIR/hooks/pre-rebase"
	then
		"$GIT_DIR/hooks/pre-rebase" ${1+"$@"} ||
		die "The pre-rebase hook refused to rebase."
	fi
}

test -f "$GIT_DIR"/rebase-apply/applying &&
	die 'It looks like git-am is in progress. Cannot rebase.'

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

while test $# != 0
do
	case "$1" in
	--no-verify)
		OK_TO_SKIP_PRE_REBASE=yes
		;;
	--continue)
		test -d "$dotest" -o -d "$GIT_DIR"/rebase-apply ||
			die "No rebase in progress?"

		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 "$dotest/onto")
			GIT_QUIET=$(cat "$dotest/quiet")
			continue_merge
			while test "$msgnum" -le "$end"
			do
				call_merge "$msgnum"
				continue_merge
			done
			finish_rb_merge
			exit
		fi
		head_name=$(cat "$GIT_DIR"/rebase-apply/head-name) &&
		onto=$(cat "$GIT_DIR"/rebase-apply/onto) &&
		orig_head=$(cat "$GIT_DIR"/rebase-apply/orig-head) &&
		GIT_QUIET=$(cat "$GIT_DIR