Don't try to detect backing LVM volume is snapshot is disabled

virt-backup

@@ -410,6 +410,9 @@ sub prepare_backup{
             }
             # If the disk is a file
             elsif ($disk->{type} eq 'file'){
+                my $file = $source;
+                # Try to snapshot this device
+                if ( $opts{snapshot} ){
                     # Try to find the mount point, and the backing device
                     my @df = `df -PT $source`;
                     my ($dev, undef, undef, undef, undef, undef, $mount) = split /\s+/, $df[1];
@@ -432,11 +435,8 @@ sub prepare_backup{
                         die "Couldn't detect the backing device for $source. You should pass it as argument like --lvm=/dev/vg/lv\n\n";
                     }
                     my $mp   = $lvm;
-                $mp      =~ s!/!_!g;
+                    $mp      =~ s|/|_|g;
                     $mp      = "$backupdir.mount/$mp/";
-                my $file = $source;
-                # Try to snapshot this device
-                if ( $opts{snapshot} ){
                     # Maybe the LVM is already snapshoted and mounted for a previous disk ?
                     my $is_mounted = 0;
                     if (open MOUNT, "<$backupdir.meta/mount"){