#!/bin/sh

# This script prepends BASE_PATH to any arguments that are not options (start
# with --) and do not start with BASE_PATH already.
# It then executes its equivalent in /usr/bin with those updated arguments.
#
# This script is meant to provide a base path for accessing git repositories
# through ssh. This is similar to running git-daemon(1) with --base-path and
# --base-path-relaxed. 

BASE_PATH='/data/vcs/git'

function init_repos() {
	mkdir "$1" &> /dev/null  || return 1 
	(cd $1 && git --bare init &> /dev/null) || return 1
}

# We keep an array of arguments, so we can handle quoting an spaces in
# arguments properly.
ARGS=()
i=0
until [ "$#" -eq 0 ]
do
	if echo $1 | egrep "^--" &>/dev/null; then
		# This is an option argument, leave it untouched
		ARGS[$i]="$1"
	elif echo $1 | egrep ".git$" &>/dev/null; then
		# This is a path to a git repository
		DIR="$1"
		# Prepend BASE_PATH if the path does not start with it already.
		if ! echo $DIR | egrep "^$BASE_PATH" &>/dev/null; then
			DIR="$BASE_PATH/$DIR"
		fi
	
		# When the client wants us to receive a pack, create the git
		# repository if it does not exist yet	
		if [ "`basename $0`" = "git-receive-pack" -a ! -e "$DIR" ]; then
			init_repos "$DIR"
		fi
		ARGS[$i]="$DIR"
	else
		# Not a path to a git repository, leave untouched.
		ARGS[$i]="$1"
	fi
	((i++))
	shift
done

exec /usr/bin/`basename $0` "${ARGS[@]}"