#!/bin/bash


function detectorSum(){
	local dir=$1
	[ -f $dir/FETCH_HEAD ] || touch $dir/FETCH_HEAD
	# use md5sum - it is in busybox
	cat $dir/FETCH_HEAD | md5sum | cut -f1 -d' '
}

function detectorSumPersist(){
	detectorSum $1 > $CCLONE_CACHE/detectorSum
}

function detectorCheckFetchHead(){
	# check if repo fetch_head changed, if so, return 1 
	local dir=$1

	[ -f $CCLONE_CACHE/detectorSum ]  || touch $CCLONE_CACHE/detectorSum

	newSum=$(detectorSum $dir)
	oldSum=$(cat $CCLONE_CACHE/detectorSum)

	if [ "x$oldSum" = "x$newSum" ] 
	then
		return 0
	else
		return 1
	fi
}


function gitListTags(){
	local dir=$1
	git --git-dir="$dir" tag -l | cat
}

function gitListBranches(){
	local dir=$1
	git --git-dir="$dir" for-each-ref --format='%(refname:short)' refs/heads/
}


function gitPrefBranches(){
	local dir=$1
	gitListBranches $1 | grep master || true
	gitListBranches $1 | grep upstream || true
	gitListBranches $1 | sort | grep -vE 'master|upstream'
}