X-Git-Url: http://git.annexia.org/?a=blobdiff_plain;f=tools%2Fvirt-cat;h=66806a1abef1420abf9057210deed34b3a25e8e9;hb=607dcadd2dc7883865ada5ae158e750f19dfff67;hp=c8cdd193b214bed3ab0322a55e99ce966a234dbd;hpb=9a608a1516bd339dc6d5ebe9952d3bced273c416;p=libguestfs.git

diff --git a/tools/virt-cat b/tools/virt-cat
index c8cdd19..66806a1 100755
--- a/tools/virt-cat
+++ b/tools/virt-cat
@@ -109,6 +109,23 @@ connect to the default libvirt hypervisor.
 If you specify guest block devices directly, then libvirt is not used
 at all.
 
+=cut
+
+my $format;
+
+=item B<--format> raw
+
+Specify the format of disk images given on the command line.  If this
+is omitted then the format is autodetected from the content of the
+disk image.
+
+If disk images are requested from libvirt, then this program asks
+libvirt for this information.  In this case, the value of the format
+parameter is ignored.
+
+If working with untrusted raw-format guest disk images, you should
+ensure the format is always specified.
+
 =back
 
 =cut
@@ -116,6 +133,7 @@ at all.
 GetOptions ("help|?" => \$help,
             "version" => \$version,
             "connect|c=s" => \$uri,
+            "format=s" => \$format,
     ) or pod2usage (2);
 pod2usage (1) if $help;
 if ($version) {
@@ -132,9 +150,9 @@ my $filename = pop @ARGV;
 
 my $g;
 if ($uri) {
-    $g = open_guest (\@ARGV, address => $uri);
+    $g = open_guest (\@ARGV, address => $uri, format => $format);
 } else {
-    $g = open_guest (\@ARGV);
+    $g = open_guest (\@ARGV, format => $format);
 }
 
 $g->launch ();
@@ -150,7 +168,6 @@ my %fses =
 my $oses = inspect_operating_systems ($g, \%fses);
 
 my @roots = keys %$oses;
-die __"no root device found in this operating system image" if @roots == 0;
 die __"multiboot operating systems are not supported by virt-cat" if @roots > 1;
 my $root_dev = $roots[0];
 
@@ -161,6 +178,13 @@ mount_operating_system ($g, $os);
 # NB: https://bugzilla.redhat.com/show_bug.cgi?id=501888
 print $g->download($filename, "/dev/stdout");
 
+=head1 SHELL QUOTING
+
+Libvirt guest names can contain arbitrary characters, some of which
+have meaning to the shell such as C<#> and space.  You may need to
+quote or escape these characters on the command line.  See the shell
+manual page L<sh(1)> for details.
+
 =head1 SEE ALSO
 
 L<guestfs(3)>,