#!/bin/sh

# Echo help information
usage()
{
	cat <<EOF
Usage: $0 [options] <command> <parameters>
  Tool for VCS repository administration.
  VCS support: $possible_vcs
Options:
  -h, --help
	Print help message.
Commands:
  add <repository1> [repository2] ...
	Create new repository.
  del <repository1> [repository2] ...
	Delete existing repository.
  fixmod <repository1> [repository2] ...
	Fix access rights for repository.
  useradd <repository> <r/w/rw> <user1> [user2] ...
	Set access rights for user(s) to repository.
  userdel <repository> <r/w/rw> <user1> [user2] ...
	Remove access rights for user(s) to repository.
EOF
}

group_add()
{
	groupadd -K GID_MIN=${group_gid_min} ${group_r_prefix}$1
	groupadd -K GID_MIN=${group_gid_min} ${group_w_prefix}$1
}

group_del()
{
	groupdel ${group_r_prefix}$1
	groupdel ${group_w_prefix}$1
}

svn_add()
{
	repository_name=$1
	repo_r=${repository_root}/${repository_name}
	repo_w=${repository_root}/${repository_name}/${repository_name}

	mkdir ${repo_r}
	saved_umask=`umask`
	umask 002
	svnadmin --fs-type=fsfs create ${repo_w}
	umask ${saved_umask}
}

svn_fixmod()
{
	repository_name=$1
	repo_r=${repository_root}/${repository_name}
	repo_w=${repository_root}/${repository_name}/${repository_name}

	chmod 750 ${repo_r}
	chgrp ${group_r_prefix}${repository_name} ${repo_r}
	chgrp -R ${group_w_prefix}${repository_name} ${repo_w}
	dirs=`find ${repo_w} -type d`
	for dir in $dirs; do
		chmod g+s $dir
	done
	chmod -R g+w ${repo_w}
}

svn_del()
{
	rm -Rf ${repository_root}/$1
}

link_add()
{
	ln -s ${repository_root}/$1/$1 ${repository_link}/$1
}

link_del()
{
	rm -f ${repository_link}/$1
}

repository_add()
{
	for rep_name in "$@"; do
		group_add $rep_name
		svn_add $rep_name
		svn_fixmod $rep_name
		link_add $rep_name
	done
}

repository_fixmod()
{
	for rep_name in "$@"; do
		svn_fixmod $rep_name
	done
}

repository_del()
{
	for rep_name in "$@"; do
		link_del $rep_name
		svn_del $rep_name
		group_del $rep_name
	done
}

user_add()
{
	w=0
	r=0
	
	repository_name=$1
	shift
	case "$1" in
	r)
		r=1
		;;
	w)
		w=1
		;;
	rw|wr)
		r=1
		w=1
		;;
	*)
		echo "Illegal parameter $1"
		exit -1
		;;
	esac
	shift
	for user_name in "$@"; do
		if [ $r -ne 0 ]; then
			adduser ${user_name} ${group_r_prefix}${repository_name}
		fi
		if [ $w -ne 0 ]; then
			adduser ${user_name} ${group_w_prefix}${repository_name}
		fi
	done
}

user_del()
{
	w=0
	r=0

	repository_name=$1
	shift
	case "$1" in
	r)
		r=1
		;;
	w)
		w=1
		;;
	rw|wr)
		r=1
		w=1
		;;
	*)
		echo "Illegal parameter $1"
		exit -1
		;;
	esac
	shift
	for user_name in "$@"; do
		if [ $r -ne 0 ]; then
			deluser ${user_name} ${group_r_prefix}${repository_name}
		fi
		if [ $w -ne 0 ]; then
			deluser ${user_name} ${group_w_prefix}${repository_name}
		fi
	done
}

#------------------ MAIN -----------------------------------------

possible_vcs="svn git"

# Defaults for rfa.conf
group_gid_min="3000"
group_w_prefix="vcs_w-"
group_r_prefix="vcs_r-"
repository_root=
repository_link=

# Parse command line options
action="help"
opts_force=0
opts_conf="/etc/repoforge/rfa.conf"
opts_vcs="svn"

while test "x$1" != "x"; do
	option="$1"
	case "$option" in
	-h|--help)
		usage
		exit 0
		;;
	-f|--force)
		opts_force=1
		;;
	# Config file
	-c)
		shift
		opts_conf="$1"
		;;
	--config=*)
		opts_conf=`echo "$option" | sed 's/--config=//'`
		;;
	# Choose VCS
	-s)
		shift
		opts_vcs="$1"
		;;
	--vcs=*)
		opts_vcs=`echo "$option" | sed 's/--vcs=//'`
		;;
	# Default
	*)
		action="$option"
		shift
		break
		;;
	esac
	shift
done

test "x$action" = "xhelp" && { usage; exit 0; }

# Check options
bad_vcs=1
for v in $possible_vcs; do
	test "x$opts_vcs" = "x$v" && { bad_vcs=""; break; }
done
test "x$bad_vcs" = "x" || { echo "Error: Illegal VCS \"$opts_vcs\"" 1>&2; exit 1; }

# Include config file
test -r "$opts_conf" && . $opts_conf
# Compatibility (suppose SVN)
test "x$repository_svn_root" = "x" && repository_svn_root="$repository_root"
test "x$repository_svn_link" = "x" && repository_svn_link="$repository_link"
eval repository_root="\$repository_${opts_vcs}_root"
eval repository_link="\$repository_${opts_vcs}_link"
test "x$repository_root" = "x" && { echo "Error: Illegal repository root \"\"" 1>&2; exit 1; }
test "x$repository_link" = "x" && { echo "Error: Illegal repository link \"\"" 1>&2; exit 1; }
test -d "$repository_root" || { echo "Error: Illegal repository root \"$repository_root\"" 1>&2; exit 1; }
test -d "$repository_link" || { echo "Error: Illegal repository link \"$repository_link\"" 1>&2; exit 1; }

# Action
case "$action" in
"add")
	test $# -lt 1 && { echo "Error: Repository name is expected" 1>&2; exit 1; }
	repository_add "$@"
	;;
"fixmod")
	test $# -lt 1 && { echo "Error: Repository name is expected" 1>&2; exit 1; }
	repository_fixmod "$@"
	;;
"del")
	test $# -lt 1 && { echo "Error: Repository name is expected" 1>&2; exit 1; }
	repository_del "$@"
	;;
"adduser"|"useradd")
	test $# -lt 3 && { echo "Error: Not enough parameters" 1>&2; exit 1; }
	user_add "$@"
	;;
"deluser"|"userdel")
	test $# -lt 3 && { echo "Error: Not enough parameters" 1>&2; exit 1; }
	user_del "$@"
	;;
*)
	echo "Error: Unknown command" 1>&2
	exit 1
	;;
esac

exit 0