guilt-repair

#!/bin/sh
#
# Copyright (c) Josef "Jeff" Sipek, 2008-2013
#

DO_NOT_CHECK_STATUS_FILE_FORMAT=1

USAGE="--full | --status"
if [ -z "$GUILT_VERSION" ]; then
	echo "Invoking `basename "$0"` directly is no longer supported." >&2
	exit 1
fi

safety_abort()
{
	die "Please read the man page first. (you need to specify repair mode to proceed)."
}

#
# Check whether status file needs fixing/upgrading. If not, just return,
# otherwise proceed to rewrite the status file and set up proper refs
#
repair_status()
{
	_disp "Checking status file format..."
	if ! grep "^[0-9a-f]\{40\}:" "$applied" > /dev/null ; then
		disp "ok; no upgrade necessary."
		return 0
	fi
	disp "old; about to upgrade."

	# we got an old format status file

	printf "" > "$applied.new"

	cat "$applied" | while read line ; do
		hash=`echo "$line" | cut -d: -f1`
		pname=`echo "$line" | cut -d: -f2-`

		npname=`echo "$pname" | sed -e 's/ /-/g'`
		[ "$pname" != "$npname" -a -e "$npname" ] && die "Patch name collision"

		git update-ref "refs/patches/$branch/$npname" "$hash"
		echo "$npname" >> "$applied.new"

		if [ "$pname" != "$npname" ]; then
			series_rename_patch "$pname" "$npname"

			mv "$GUILT_DIR/$branch/$pname" "$GUILT_DIR/$branch/$npname"
		fi
	done

	# replace the status file
	mv "$applied" "$applied~"
	mv "$applied.new" "$applied"

	disp "Upgrade complete."

	return 0
}

#
# Pop all patches - forcefully.
#
repair_pushed()
{
	if [ -s "$applied" ]; then
		# there were some patches applied
		newrev=`git rev-parse refs/patches/$branch/$(head_n 1 < "$applied")^`
	else
		# no patches were applied, but let's do all the work anyway
		newrev="$oldrev"
	fi

	disp "Current  HEAD commit $oldrev"
	disp "New      HEAD commit $newrev"

	disp "About to forcefully pop all patches..."
	_disp "Are you sure you want to proceed? [y/N] "
	read n
	if [ "$n" != "y" ] && [ "$n" != "Y" ]; then
		die "Aborting..."
	fi

	# blow away any commits
	git reset --hard "$newrev" > /dev/null
	if [ "`git symbolic-ref HEAD`" = "refs/heads/$GUILT_PREFIX$branch" ] && ! $old_style_prefix
	then
		git symbolic-ref HEAD refs/heads/$branch
		git update-ref -d refs/heads/$GUILT_PREFIX$branch
	fi

	# blow away the applied stack
	remove_patch_refs < "$applied"
	printf "" > "$applied"

	disp "Patches should be popped."
	return 0
}

_main() {

[ $# -ne 1 ] && safety_abort

case "$1" in
	--full)
		repair="full"
		;;
	--status)
		repair="status"
		;;
	--autotag)
		echo "Autotagging is no longer supported" >&2
		;;
	*)
		usage
		;;
esac

oldrev=`git show-ref -s "refs/heads/\`git_branch\`"`

case "$repair" in
	full)
		repair_status
		repair_pushed
		;;
	status)
		repair_status
		;;
	*)
		die "Internal error"
		;;
esac

disp "Repair complete."
exit 0

}