#! /usr/bin/bash
#set -x
#DEBUG=echo

upstream_branch=upstream
our_name=suse

die() {
    local retval=$1
    rm -rf $tmpdir
    exit $retval
}

usage() {
    echo -e "$0  [ -r <repository> ] ...\n" \
	 "  Convert repo to sha256 and run git command.\n" \
	 "  ie. \`push {<repository>|${our_name}...\`\n" \
	 "  -r <repository>: provide remote repository.\n" \
	 "  Alternatively set environment variable SUSE_GIT.\n" \
	 "  Local or remote branches from 'origin' are set up to be\n" \
	 "  pushed to remotes/upstream/*\n"
    exit 0
}

[ "$1" = "-h" ] && usage

git_url=$(git config remote.origin.url)
repo=$(basename $git_url)

target_git=$our_name
[ "$1" = "-r" ] && { shift; target_git=$1; shift; }
cmdargs="${1+$@}"
[ "$target_git" = "$our_name" ] && [[ $cmdargs =~ push\ ([^\ ]+)\\* ]] \
    && target_git=${BASH_REMATCH[1]}
[ "$target_git" = "$our_name" ] && target_git=$SUSE_GIT
[ -n "$target_git" -a "$target_git" != "$our_name" ] || \
    { echo -e "Target repo cannot be determined\n"\
	   " set environment variable SUSE_GIT\n"\
	   " to target repository or use the -r option"; exit 1; }
[[ $target_git =~ .*/${repo} ]] || [[ $target_git =~ .*/${repo%.git} ]] || target_git+="/${repo}"
cmdargs=${cmdargs//${target_git}/${our_name}}

tmpdir=$(mktemp -d /tmp/tmp-XXXXXXXXX)

mkdir -p $tmpdir/$repo
git init --object-format=sha256 $tmpdir/$repo

git fast-export --all | env GIT_DIR=$tmpdir/$repo/.git git fast-import
export GIT_DIR=$tmpdir/$repo/.git
git remote add origin ${git_url}
git remote add ${our_name} ${target_git}
git config set remote.${our_name}.push refs/heads/\*:refs/remotes/${upstream_branch}/\*
git config set --append remote.${our_name}.push refs/remotes/origin/\*:refs/remotes/${upstream_branch}/\*
#git remote rename origin ${upstream_branch}
[ -n "$DEBUG" ] && $DEBUG $tmpdir
${DEBUG} git ${cmdargs} || die $?

[ -n "$DEBUG" ] && echo $tmpdir || rm -rf $tmpdir