From 41e9edcaf36bf2b7d56eee71bee80703176d111e Mon Sep 17 00:00:00 2001
From: Chris Lamb <chris@chris-lamb.co.uk>
Date: Sun, 15 Jun 2008 05:30:42 +0100
Subject: [PATCH] Check losetup capabilities before specifying to mount as
 read-only.

This is to retain compatibility with Etch's non-loop-aes-utils' losetup.
---
 scripts/live         | 7 ++++++-
 scripts/live-helpers | 5 ++++-
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/scripts/live b/scripts/live
index 3f39c97..ee363c3 100755
--- 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" ]
diff --git a/scripts/live-helpers b/scripts/live-helpers
index 02c3e55..20952f3 100644
--- a/scripts/live-helpers
+++ b/scripts/live-helpers
@@ -181,7 +181,10 @@ setup_loop ()
 
 			if [ -n ${readonly} ]
 			then
-				options="${options} -r"
+				if /sbin/losetup --help 2>&1 | grep -q -- "-r\b"
+				then
+					options="${options} -r"
+				fi
 			fi
 
 			if [ 0 -lt "${offset}" ]
-- 
2.1.4