#!/bin/bash

set -e

usage() {
    echo "usage: dcp-update [-Nh] REPODIR"
}

rungit() {
    (
	cd "$td/repo"
	git "$@"
    ) || false
}

defdir=/srv/dcp
push=y

while [ "${1:0:1}" = - ]; do
    opt="${1:1}"
    shift
    if [ "$opt" = N ]; then
	push=n
	shift
    elif [ "$opt" = h ]; then
	usage
	exit 0
    else
	echo "dcp-update: unknown option '$opt'" >&2
	exit 1
    fi
done

if [ $# -lt 1 ]; then
    usage >&2
    exit 1
fi

repodir="$1"
shift
if [[ "$repodir" != */* ]]; then
    repodir="$defdir/${repodir}.git"
fi

if [ ! -d "$repodir" ]; then
    echo "dcp-build: could not find $repodir" >&2
    exit 1
fi

td="$(mktemp -d /tmp/dcp-XXXXXX)"
exec >"$td/log" 2>"$td/err"
dcp-runenv "$repodir" "$td"

lastrev="$(rungit rev-parse HEAD)"
(cd "$td"; control/update) || false
rungit checkout master
newrev="$(rungit rev-parse HEAD)"

echo "update: $lastrev -> $newrev"

if [ "$push" = y ]; then rungit push; fi

rm -rf "$td"