copy-modloop: add -h option and usage text

1 files changed, 22 insertions, 1 deletions

diff --git a/copy-modloop.in b/copy-modloop.in
index e72b645..8d57f5a 100644
--- a/copy-modloop.in
+++ b/copy-modloop.in
@@ -1,7 +1,28 @@
 #!/bin/sh
 
 PREFIX=@PREFIX@
-. "$PREFIX/lib/libalpine.sh"
+: ${LIBDIR=$PREFIX/lib}
+. "$LIBDIR/libalpine.sh"
+
+usage() {
+	cat <<-__EOF__
+		usage: copy-modloop
+
+		Copy kernel modules from modloop and unmount loopback device
+
+		options:
+		 -h  Show this help
+	__EOF__
+	exit $1
+}
+
+while getopts "h" opt; do
+	case $opt in
+		h) usage 0;;
+		'?') usage "1" >&2;;
+	esac
+done
+shift $(($OPTIND - 1))
 
 set -e