#!/bin/sh
# Copyright (c) 2012 Felipe Contreras

# The first argument can be a url when the fetch/push command was a url
# instead of a configured remote. In this case, use a generic alias.
if test $1 = "testgit::$2" {
	setvar alias = '_'
} else {
	setvar alias = "$1"
}
setvar url = "$2"

setvar dir = ""$GIT_DIR/testgit/$alias""
setvar prefix = ""refs/testgit/$alias""

setvar default_refspec = ""refs/heads/*:${prefix}/heads/*""

setvar refspec = "${GIT_REMOTE_TESTGIT_REFSPEC-$default_refspec}"

test -z $refspec && setvar prefix = ""refs""

setvar GIT_DIR = ""$url/.git""
export GIT_DIR

setvar force = ''

mkdir -p $dir

if test -z $GIT_REMOTE_TESTGIT_NO_MARKS
{
	setvar gitmarks = ""$dir/git.marks""
	setvar testgitmarks = ""$dir/testgit.marks""
	test -e $gitmarks || >"$gitmarks"
	test -e $testgitmarks || >"$testgitmarks"
}

while read line
{
	case (line) {
	capabilities {
		echo 'import'
		echo 'export'
		test -n $refspec && echo "refspec $refspec"
		if test -n $gitmarks
		{
			echo "*import-marks $gitmarks"
			echo "*export-marks $gitmarks"
		}
		test -n $GIT_REMOTE_TESTGIT_SIGNED_TAGS && echo "signed-tags"
		test -n $GIT_REMOTE_TESTGIT_NO_PRIVATE_UPDATE && echo "no-private-update"
		echo 'option'
		echo
		}
	list {
		git for-each-ref --format='? %(refname)' 'refs/heads/'
		setvar head = $(git symbolic-ref HEAD)
		echo "@$head HEAD"
		echo
		}
	import* {
		# read all import lines
		while true
		{
			setvar ref = "${line#* }"
			setvar refs = ""$refs $ref""
			read line
			test ${line%% *} != "import" && break
		}

		if test -n $gitmarks
		{
			echo "feature import-marks=$gitmarks"
			echo "feature export-marks=$gitmarks"
		}

		if test -n $GIT_REMOTE_TESTGIT_FAILURE
		{
			echo "feature done"
			exit 1
		}

		echo "feature done"
		git fast-export \
			${testgitmarks:+"--import-marks=$testgitmarks"} \
			${testgitmarks:+"--export-marks=$testgitmarks"} \
			$refs |
		sed -e "s#refs/heads/#${prefix}/heads/#g"
		echo "done"
		}
	export {
		if test -n $GIT_REMOTE_TESTGIT_FAILURE
		{
			# consume input so fast-export doesn't get SIGPIPE;
			# git would also notice that case, but we want
			# to make sure we are exercising the later
			# error checks
			while read line {
				test "done" = $line && break
			}
			exit 1
		}

		setvar before = $(git for-each-ref --format=' %(refname) %(objectname) ')

		git fast-import \
			${force:+--force} \
			${testgitmarks:+"--import-marks=$testgitmarks"} \
			${testgitmarks:+"--export-marks=$testgitmarks"} \
			--quiet

		# figure out which refs were updated
		git for-each-ref --format='%(refname) %(objectname)' |
		while read ref a
		{
			case (before) {
			*" $ref $a "* {
				continue }	# unchanged
			}
			if test -z $GIT_REMOTE_TESTGIT_PUSH_ERROR
			{
				echo "ok $ref"
			} else {
				echo "error $ref $GIT_REMOTE_TESTGIT_PUSH_ERROR"
			}
		}

		echo
		}
	option\ * {
		read cmd opt val <<< """
$line
"""
		case (opt) {
		force {
			test $val = "true" && setvar force = ""true"" || setvar force = ''
			echo "ok"
			}
		* {
			echo "unsupported"
			}
		}
		}
	'' {
		exit
		}
	}
}