Check losetup capabilities before specifying to mount as read-only.

[live-boot-grml.git] / scripts / live

diff --git a/scripts/live b/scripts/live
index 3f39c97..ee363c3 100755 (executable)
--- a/scripts/live
+++ b/scripts/live
@@ -1008,7 +1008,12 @@ setup_unionfs ()
                        rofslist="${image} ${rofslist}"
                elif [ -f "${image}" ]
                then
-                       backdev=$(get_backing_device "${image}" "-r")
+                       if /sbin/losetup --help 2>&1 | grep -q -- "-r\b"
+                       then
+                               backdev=$(get_backing_device "${image}" "-r")
+                       else
+                               backdev=$(get_backing_device "${image}")
+                       fi
                        fstype=$(get_fstype "${backdev}")
 
                        if [ "${fstype}" = "unknown" ]