#!/bin/sh
#
# /etc/ports/drivers/git: git driver script for ports(8)
#
# The configuration files got to have following variables defined:
# URL: 		The URL from where to clone the repository
# BRANCH: 	The branch of the repository to use
# DESTINATION:	The destination directory for the checked out repository

OLDPWD=$PWD
export PAGER=cat

# checks whether we got a valid repository (exit code will be 0, if the
# repository is valid, otherwise 1)
function checkValidRepository() {
	if [ -d $DESTINATION/.git ]
	then
		cd $DESTINATION
		if [ "$URL" ==  `git config --get remote.origin.url` ]
		then
			return 0
		fi
	fi
	return 1
}

# check, whether we got a configuration file given
if [ $# -ne 1 ]
then
	echo "usage: $0 <configuration file>"
	exit 1
fi

. $1

echo "Updating collection `basename $DESTINATION` from $URL"

checkValidRepository
if [ $? -ne 0 ]
then
	# the repository was not setup correctly -> delete it
	if [ -d $DESTINATION ]
	then
		rm -rf $DESTINATION
	fi

	# clone the repository
	git-clone --depth 1 --quiet $URL $DESTINATION
	cd $DESTINATION
else
	# there was already a clone -> fetch the changes
	cd $DESTINATION
	# print the files, which will be reseted
	git-diff --name-status -R $BRANCH
	git-reset --hard -q
	git-fetch --quiet
	git-gc --quiet

fi

# print all the updated files
git-diff --name-status -R $BRANCH

git-checkout -q $BRANCH

cd $OLDPWD

echo "Finished successfully"