From fa75d0f7bc374b88911c2bc5746bafb156987286 Mon Sep 17 00:00:00 2001
From: Jaromil <jaromil@dyne.org>
Date: Thu, 5 Sep 2013 12:45:40 +0200
Subject: [PATCH] check if loop mount is possible

if not abort gracefully with an explanation
(10x to Bucciarati and sdonk)
---
 tomb | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/tomb b/tomb
index 7bd21d9..758b65c 100755
--- a/tomb
+++ b/tomb
@@ -216,6 +216,15 @@ EOF
 	exit $?
     fi # are we root already
 
+    # check if we have support for loop mounting
+    losetup -f > /dev/null
+    { test "$?" = "0" } || {
+	no "Loop mount of volumes is not supported on this machine, this error"
+	no "often occurs on VPS and kernels that don't provide the loop module."
+	no "It is impossible to use Tomb on this machine at this conditions."
+	die "Operation aborted."
+    }
+
     # make sure necessary kernel modules are loaded
     modprobe dm_mod 2>/dev/null
     modprobe dm_crypt 2>/dev/null