#!/bin/bash
#
# Copyright (c) 2007 Andy Parkins
# Copyright (c) 2008 Stephen Haberman
# Copyright (c) 2013 Olivier Matz
#
# Based on post-receive-email
#
# This hook clone and pull the repoditory each time a commit is pushed
# in the tree. Each branch will be delivered in
# ${GIT_DELIVER_DIRECTORY}/branch.


# ---------------------------- Functions

. $(dirname $0)/functions

generate_delivery()
{
	# --- Arguments
	oldrev=$(git rev-parse $1)
	newrev=$(git rev-parse $2)
	refname="$3"

	set_change_type
	set_rev_types
	set_describe_tags

	# The revision type tells us what type the commit is, combined with
	# the location of the ref we can decide between
	#  - working branch
	#  - tracking branch
	#  - unannoted tag
	#  - annotated tag
	case "$refname","$rev_type" in
		refs/heads/*,commit)
			# branch
			refname_type="branch"
			function="branch"
			branch=${refname##refs/heads/}
			;;
		*)
			# nothing to do
			return
			;;
	esac

	if expr "$newrev" : '0*$' >/dev/null; then
		# nothing to do, branch is deleted
		return
	fi

	dstdir=${GIT_DELIVER_DIRECTORY}/${branch}
	if [ ! -d ${dstdir} ]; then
		mkdir -p ${GIT_DELIVER_DIRECTORY} || exit 2
		cd ${GIT_DELIVER_DIRECTORY}
		git clone --branch ${branch} ${GIT_DIR} ${branch}
	else
		cd ${dstdir}
		unset GIT_DIR
		git pull --rebase
	fi
}

# ---------------------------- main()


# --- Config
# Set GIT_DIR either from the working directory or the environment variable.
GIT_DIR=$(git rev-parse --git-dir 2>/dev/null)
if [ -z "$GIT_DIR" ]; then
	echo >&2 "fatal: post-receive: GIT_DIR not set"
	exit 1
fi
GIT_DIR=$(readlink -e ${GIT_DIR})
export GIT_DIR

if [ -z "${GIT_DELIVER_DIRECTORY}" ]; then
	echo >&2 "fatal: GIT_DELIVER_DIRECTORY not set"
	exit 1
fi

recipients=$(git config hooks.post-receive-email.mailinglist)

# --- Main loop
# Allow dual mode: run from the command line just like the update hook, or
# if no arguments are given then run as a hook script
if [ -n "$1" -a -n "$2" -a -n "$3" ]; then
	# Output to the terminal in command line mode - if someone wanted to
	# resend an email; they could redirect the output to sendmail
	# themselves
	PAGER= generate_delivery $2 $3 $1
else
	while read oldrev newrev refname
	do
		generate_delivery $oldrev $newrev $refname
	done
fi