#!/bin/bash
set -e
set -u

shopt -qu globstar
shopt -qs expand_aliases
export LC_COLLATE=C
export LC_ALL=C

diff_ops="-O.git.diff.order --patience -l0"
format_patch_ops="--zero-commit --no-signature --no-numbered --stat=80 --summary $diff_ops"
alias othergit="GIT_DIR=$PWD/.rhboot.git GIT_WORK_TREE=$PWD git"
alias formatpatch="othergit format-patch $format_patch_ops"

usage()
{
	retcode=0
	if [ -n "${1:-}" ]; then
		exec 1>&2
		retcode=$1
	fi
	echo usage: "do-rebase [OPTIONS] --dist=<RELEASE_VER> --repo=<REPOSITORY> --branch=<BRANCH>"
	echo OPTIONS: "--amend --commit --nocommit --bumpspec --nobumpspec"
	exit "$retcode"
}

on_error() {
    exec 1>&2
    echo "An error occurred. Exiting..."
    git reset --hard
    exit 1
}

trap 'on_error' ERR

# Check if the working directory is clean (no changes)
if ! git diff-index --quiet HEAD --; then
	echo "Working directory is not clean, cannot rebase." 1>&2
	exit 1
fi

gitrepo=""
branch=""
releasever=""
amend=""
commit=1
bumpspec=1

while [ $# -gt 0 ]; do
	case $1 in
	--help|-h|--usage|-?|-u)
		usage
		;;
	--dist=*)
		releasever=${1##--dist=}
		;;
	--dist)
		shift
		releasever=$1
		;;
	--repo=*)
		gitrepo=${1##--repo=}
		;;
	--repo)
		shift
		gitrepo=$1
		;;
	--branch=*)
		  branch=${1##--branch=}
		  ;;
	--branch)
		  shift
		  branch=$1
		  ;;
	--amend)
		amend="--amend"
		;;
	--commit)
		commit=1
		;;
	--nocommit|--no-commit|--nc)
		# --nocommit implies nobumpspec, but --bumpspec after it will
		# force bumpspec to get run.
		commit=0
		bumpspec=0
		;;
	--bumpspec)
		bumpspec=2
		;;
	--nobumpspec|--no-bumpspec|--nb)
		bumpspec=0
		;;
	*)
    echo "Unknown parameter $1"
		;;
	esac
	shift
done

# check must params
if [ -z "$releasever" ] || [ -z "$gitrepo" ] || [ -z "$branch" ]; then
    usage
fi

if [ ! -d "$PWD/.rhboot.git" ]; then
	othergit init
	othergit config core.abbrev 11
	if ! othergit remote add rhboot "$gitrepo" >/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$" ; then
	if ! othergit remote add rhboot "$gitrepo" >/dev/null 2>&1 ; then
		echo "Could not add remote: rhboot" 1>&2
		exit 1
	fi
else
	othergit remote set-url rhboot "${gitrepo}"
fi

othergit fetch rhboot

unset LC_ALL
git rm -q 0*.patch

fedpkg --release "$releasever" sources

> grub.patches
patches=$(formatpatch refs/remotes/rhboot/master..refs/remotes/rhboot/"${branch}")
for x in $patches ; do
	echo "Patch$(echo "${x}" | cut -d- -f1): ${x}" >> grub.patches
done
if [[ -z "$amend" && ${bumpspec} -gt 0 ]] || [[ ${bumpspec} -ge 2 ]] ;  then
    rpmdev-bumpspec -c "- Rebased to newer upstream for ${releasever}" grub2.spec
fi
git add 0*.patch grub2.spec grub.patches
if [[ ${commit} -eq 1 ]] ; then
  if [ -z "$amend" ]; then
    fedpkg --release "$releasever" commit -s -c
  else
    git commit --amend
  fi
fi