#!/bin/bash

set -e

set -u

shopt -qu globstar

shopt -qs expand_aliases

export LC_COLLATE=C

export LC_ALL=C

alias othergit="GIT_DIR=$PWD/.rhboot.git GIT_WORK_TREE=$PWD git"

usage()

{

	retcode=0

	if [ -n "$1" ]; then

		exec 1>&2

		retcode=$1

	fi

	echo usage: do-rebase \$releasever

	exit $retcode

}

if ! git status | grep -q 'nothing to commit, working .* clean' ; then

	echo "Working directory is not clean, cannot rebase." 1>&2

	exit 1

fi

releasever=""

amend=""

declare -a savedargs

savedargs=()

while [ $# -gt 0 ]; do

	case $1 in

	--help|-h|--usage|-?|-u)

		usage

		;;

	--dist=*)

		releasever=${1##--dist=}

		;;

	--dist)

		shift

		releasever=$1

		;;

	--amend)

		amend="--amend"

		;;

	*)

		savedargs[${#savedargs[@]}]="$1"

		;;

	esac

	shift

done

set -- "${savedargs[@]}"

if [ -z "${releasever}" -a $# -gt 0 ]; then

	releasever=$1

	shift

else

	dist=$(git status | grep "On branch" | cut -d\  -f3-)

	if [ -z "$dist" ]; then

		echo "Could not figure out distro release version" 1>&2

		usage 1

	fi

	case "$(eval echo \${dist})" in

	.fc*)

		releasever=$(echo ${dist} | \

			sed 's/^\.fc\([[:digit:]]\+\)$/fedora-\1/')

		;;

	.*)

		releasever=$(echo $dist | \

			sed 's/^\.\([[:alpha:]]\+\)\([[:digit:]]\+\)$/\1-\2/')

		;;

	rhel*)

		releasever=${dist}

		dist=.el${releasever##rhel-}

		;;

	esac

	if [ -z "${releasever}" -o "${releasever}" = "${dist}" ]; then

		echo "Could not figure out distro release version" 1>&2

		usage 1

	fi

fi

if [ -z "$releasever" ]; then

	echo "Could not figure out distro release version" 1>&2

	usage 1

fi

if [ $# -ge 1 ]; then

	echo "Unknown argument \"$1\"" 1>&2

	usage 1

fi

if [ ! -d $PWD/.rhboot.git ]; then

	othergit init

	if ! othergit remote add \

		 rhboot git@github.com:rhboot/grub2.git \

		  >/dev/null 2>&1 ; then

		echo "Could not add remote: rhboot" 1>&2

		exit 1

	fi

elif othergit remote show -n rhboot | grep -q "URL: github$" ; then

	if ! othergit remote add \

		 rhboot git@github.com:rhboot/grub2.git \

		  >/dev/null 2>&1 ; then

		echo "Could not add remote: rhboot" 1>&2

		exit 1

	fi

fi

othergit fetch rhboot

remote=$(othergit branch --list -r "rhboot/${releasever}" 2>/dev/null)

if [ "${remote}" != "  rhboot/${releasever}" ]; then

	echo branch \"${releasever}\" does not appear to exist 1>&2

	exit 1

fi

unset LC_ALL

git rm -q 0*.patch

> grub.patches

patches=$(othergit format-patch grub-2.02..refs/remotes/rhboot/${releasever})

for x in $patches ; do

	echo Patch$(echo ${x} | cut -d- -f1): ${x} >> grub.patches

done

if [ -z "$amend" ];  then

    rpmdev-bumpspec -c "- Rebased to newer upstream for ${releasever}" grub2.spec

fi

git add 0*.patch grub2.spec grub.patches

if [ -z "$amend" ]; then

	fedpkg commit -s -c $amend

else

	git commit --amend

fi