#! @shell@

parse_opts () {
  while @coreutils@/test -n "$1" && @coreutils@/test "x$1" != x-- ; do
    case "$1" in
      --store-dir)
        shift;
        echo "STORE_DIR='$1'"
        shift;
        ;;
      --priority)
        shift;
        echo "PRIORITY=$1";
        shift;
        ;;
      --compression)
        shift;
        echo "COMPRESSION=$1";
        shift;
        ;;
      --key)
        shift;
        echo "KEY=${1#*:}"
        echo "KEYNAME=${1%%:*}"
        shift;
        ;;
      --nix-remote)
        shift;
        echo "NIX_REMOTE=$1"
        shift;
        ;;
      --mass-query)
        shift;
        echo "MASS_QUERY=$1"
        shift;
        ;;
      --port)
        shift;
        echo "PORT=$1"
        shift;
        ;;
      --ipv6)
        shift;
	echo "USE_IPV6=enable"
	;;
      --help)
        cat <<EOF >&2
"$0": start the Nix binary cache serving the Nix store dynamically.

Recognized options:

--port           server port
--store-dir      served Nix store

--priority       binary cache priority
--mass-query     0 or 1 - whether binary cache expects queries for nix-env -qas

--compression    compression to use: bzip2 or xz
--key            name:/path/to/key - key to use for narinfo signing

--nix-remote     'daemon' or empty string '' - whether to use daemon for store
                   operations

--ipv6           enable ipv6

--help           show help and exit
EOF
	exit 1;
        ;;
      *) shift ;;
    esac;
  done
}

workingdir="$(@coreutils@/mktemp -d)"
cd "$workingdir"

PORT=8080
(echo "STORE_DIR=${NIX_STORE_DIR:-/nix/store}"; parse_opts "$@"
  ) > nix-binary-cache.conf || exit
. "$workingdir/nix-binary-cache.conf"

echo "
server.port = $PORT
server.modules = ( \"mod_cgi\", \"mod_setenv\", )
server.document-root = \"$workingdir\"
cgi.assign = ( \".cgi\" => \"@shell@\" )
setenv.add-request-header = ( \"NIX_BINARY_CACHE_CONFIG\" => \"$workingdir/nix-binary-cache.conf\" )
" > lighttpd.conf

test -n "$USE_IPV6" && echo "
\$SERVER[\"socket\"] == \"[::]:$PORT\" {
server.use-ipv6 = \"enable\"
}
" >> lighttpd.conf

cp @out@/nix-binary-cache.cgi .
cp @out@/nix-binary-cache.cgi ./nix-bc.cgi

ip="$(@iproute@/ip a | @gnugrep@/grep 'inet .* scope global' | @coreutils@/head -n 1)"
ip="${ip%%/*}"
ip="${ip##* }"

url="http://$ip:$PORT/nix-bc.cgi?"

echo "Working directory: $workingdir"
echo
echo "Address of the binary cache: $url"
echo
echo "Usage example: NIX_REMOTE= nix-store --option binary-caches '$url'"
echo
echo

@lighttpd@/lighttpd -D -f "$workingdir/lighttpd.conf"

cd /
@coreutils@/rm -rf "$workingdir"