#!/usr/bin/env bash

# We want to catch any unexpected failure, and exit immediately
set -e

# Download helper for svn, to be called from the download wrapper script
#
# Options:
#   -q          Be quiet.
#   -o FILE     Generate archive in FILE.
#   -u URI      Checkout from repository at URI.
#   -c REV      Use revision REV.
#   -n NAME     Use basename NAME.
#
# Environment:
#   SVN      : the svn command to call

verbose=
while getopts "${BR_BACKEND_DL_GETOPTS}" OPT; do
    case "${OPT}" in
    q)  verbose=-q;;
    o)  output="${OPTARG}";;
    u)  uri="${OPTARG}";;
    c)  rev="${OPTARG}";;
    n)  basename="${OPTARG}";;
    :)  printf "option '%s' expects a mandatory argument\n" "${OPTARG}"; exit 1;;
    \?) printf "unknown option '%s'\n" "${OPTARG}" >&2; exit 1;;
    esac
done

shift $((OPTIND-1)) # Get rid of our options

# Caller needs to single-quote its arguments to prevent them from
# being expanded a second time (in case there are spaces in them)
_svn() {
    eval ${SVN} "${@}"
}

_svn export ${verbose} "${@}" "'${uri}@${rev}'" "'${basename}'"

tar czf "${output}" "${basename}"