#!/bin/sh

myname=`basename $0`

usage()
{
	cat << EOT | sed 's/^	|//'
	|
	| $myname [global options] cmd [cmd-arguments] ...
	| 
	| global options are:
	|
	|   -F flavour : flavour is one of: priv, jw, contrib
	|
	| commands are:
	| 
	|   create-repo name
	|   update-descriptions
	|   list-repos
	|   create-repo-dir
	|   list-maintainers
	|
EOT
	[ "$1" ] && exit $1
}

log()
{
	echo $@
	logger -t $myname "$@"
}

err()
{
	echo $@ >&2
	logger -t $myname "error: $@"
}

fatal()
{
	err "fatal: $@"
	exit 1
}

md()
{
	local dir=$1
	local mode=$2
	local owner=$3
	local group=$4

	[ -d $dir ] || {

		log "creating $dir as $owner.$group with mode $mode"
		/usr/bin/install -m $mode -o $owner -g $group -d $dir || {
			fatal "failed to create directory $dir"
		}
	}
}

check_user_is_self()
{
	[ "$id" != "$user" ] && fatal "User $id is not allowed to do this to user $user's repositories."
}

# ----------------- commands
md_p()
{
	[ -d "$1" ] && return
	md_p `dirname "$1"` $2 $3 $4
	md $@
}

cmd_cmd_create_repo_dir()
{
	[ "$UID" != 0 ] && fatal "tried to create directory \"$dir\" as `whoami`, needs to be done as root"
	local gid=`id -g $id`
	md_p /srv/git 750 root git
	md_p /srv/git/$id 750 root git
	md_p `dirname $dir` 750 $id $gid
	md_p $dir 02750 $id $gid
}

cmd_create_repo()
{
	[ -e $dir ] && {
		err "$dir already exists"
		test $no_error_if_exists -eq 0
		exit $?
	}

	/usr/bin/sudo `readlink -f $0` create-project-dir $dir || fatal "failed to create [$dir] as root"
	cd $dir || fatal "failed to change to $dir"
	git init --bare --shared=0640 || fatal "git init failed"
}

read_project_metadata()
{
	local pd="$1"
	local field="$2"
	git -C $pd show HEAD:make/project.conf | sed -n "/^\[$field\]/,/^\[/ p" | grep -v '\[' | cat -s | sed '${/^$/d;}'
}

cmd_update_descriptions()
{
	[ -d $pdir ] || return 0
	cd $pdir || return 1
	local projs="$*"
	[ "$projs" = all ] && projs=`cmd_list_repos`
	local proj
	for proj in $projs; do
		umask 0022
		[ -d "$proj" ] || fatal "Failed to find project $pdir/$proj"
		local tmp=`mktemp /tmp/$myname-XXXXXXX`
		local descr=$proj/description
		read_project_metadata $proj summary > $tmp
		[ -s "$tmp" ] || read_project_metadata $proj description > $tmp
		if [ -s "$tmp" ] && ! diff -q "$tmp" "$descr" >/dev/null 2>&1; then
			chown --reference=$proj $tmp
			chmod 640 $tmp
			echo "====== Changing description of $proj"
			echo '-- old --'
			cat $descr
			echo '-- new --'
			cat $tmp
			mv $tmp $descr
		fi
		rm -f $tmp
	done
}

cmd_list_repos()
{
	[ -d $pdir ] || return 0
	cd $pdir || return 1
	ls */HEAD | sed 's%/HEAD%%' 2>/dev/null
	return $?
}

cmd_list_maintainers()
{
	local dev_chief=jan
	local master_dir=/srv/git/$dev_chief/proj
	local d pdir p val

	for d in $master_dir; do
		for pdir in `find $d -maxdepth 1 -mindepth 1 -type d`; do
			[ -x $pdir ] || continue
			[ -r $pdir ] || continue
			#echo "$d -> $pdir"
			p=`basename $pdir`
			val=`git -C $pdir show HEAD:make/project.conf 2>/dev/null |
				sed -n '/^\[global\]/,/^\[/ p' |
				sed '
					/^[[:space:]]*jw-maintainer/ !d;
					s/.*= *//
				'`
			[ "$val" ] || val="unknown"
			[ "$val" ] || continue
			printf "%-30s %s\n" $p $val
		done
	done
}

# ----------------- here we go
no_error_if_exists=0
id=`whoami`
#user=$id
flavour=priv

OPTIND=1
while getopts jhu:F: flag; do

	case $flag in
	h)
		usage 0;;
	u)
		user=$OPTARG;;
	j) # legacy support
		flavour=jw;;
	F)
		flavour=$OPTARG;;
	p)
		no_error_if_exist=1;;
	*)
		usage 1;;
	esac
done
shift $(($OPTIND - 1))

if [ "$user" ]; then
	id=$user
else
	if [ "$SUDO_UID" ]; then
		id=`/usr/bin/getent passwd $SUDO_UID | cut -d: -f1`
		[ "$id" ] || fatal "failed to find uid $SUDO_UID in user database"
	fi
	user=$id
fi

git_home=/srv/git/$id
pdir=$git_home/priv

case $flavour in
jw|proj)
	pdir=$git_home/proj;;
priv)
	pdir=$git_home/priv;;
test)
	pdir=$git_home/test;;
contrib)
	pdir=$git_home/contrib;;
*)
	fatal "unknown repository flavour \"$flavour\""
esac

cmd=$1
shift
p=$1

dir=$pdir/$p

case $cmd in
create-personal-project|create-repo)
	check_user_is_self
	cmd_create_repo "$@"
	;;
update-descriptions|update-descr)
	cmd_update_descriptions "$@"
	;;
list-personal-projects|list-repos)
	cmd_list_repos "$@"
	;;
create-project-dir|create-repo-dir)
	dir=$1 # this is all a horrible variable and usage mess
	check_user_is_self
	cmd_cmd_create_repo_dir "$@"
	;;
list-maintainers|maintainers)
	cmd_list_maintainers
	;;
*)
	usage 1
	;;
esac