Implement the -m/--mount as available in guestfish to override the
automatic introspection and specify which partitions to mount instead.
---
cat/cat.c | 45 ++++++++++++++++++++++++++++++++++++++-------
cat/virt-cat.pod | 36 ++++++++++++++++++++++++++++++++++++
2 files changed, 74 insertions(+), 7 deletions(-)
diff --git a/cat/cat.c b/cat/cat.c
index e86ecf3..72bf81b 100644
--- a/cat/cat.c
+++ b/cat/cat.c
@@ -46,6 +46,7 @@ const char *libvirt_uri = NULL;
int inspector = 1;
static int do_cat (int argc, char *argv[]);
+static int do_cat_simple (int argc, char *argv[]);
static int is_windows (guestfs_h *g, const char *root);
static char *windows_path (guestfs_h *g, const char *root, const char
*filename);
@@ -70,6 +71,8 @@ usage (int status)
" --format[=raw|..] Force disk format for -a
option\n"
" --help Display brief help\n"
" --keys-from-stdin Read passphrases from stdin\n"
+ " -m|--mount dev[:mnt[:opts[:fstype]]]\n"
+ " Mount dev on mnt (if omitted,
/)\n"
" -v|--verbose Verbose messages\n"
" -V|--version Display version and exit\n"
" -x Trace libguestfs API calls\n"
@@ -89,7 +92,7 @@ main (int argc, char *argv[])
enum { HELP_OPTION = CHAR_MAX + 1 };
- static const char *options = "a:c:d:vVx";
+ static const char *options = "a:c:d:m:vVx";
static const struct option long_options[] = {
{ "add", 1, 0, 'a' },
{ "connect", 1, 0, 'c' },
@@ -99,12 +102,16 @@ main (int argc, char *argv[])
{ "help", 0, 0, HELP_OPTION },
{ "keys-from-stdin", 0, 0, 0 },
{ "long-options", 0, 0, 0 },
+ { "mount", 1, 0, 'm' },
{ "verbose", 0, 0, 'v' },
{ "version", 0, 0, 'V' },
{ 0, 0, 0, 0 }
};
struct drv *drvs = NULL;
struct drv *drv;
+ struct mp *mps = NULL;
+ struct mp *mp;
+ char *p;
const char *format = NULL;
int c;
int r;
@@ -152,6 +159,11 @@ main (int argc, char *argv[])
OPTION_d;
break;
+ case 'm':
+ OPTION_m;
+ inspector = 0;
+ break;
+
case 'v':
OPTION_v;
break;
@@ -214,7 +226,7 @@ main (int argc, char *argv[])
* values.
*/
assert (read_only == 1);
- assert (inspector == 1);
+ assert (inspector == 1 || mps != NULL);
assert (live == 0);
/* User must specify at least one filename on the command line. */
@@ -225,20 +237,25 @@ main (int argc, char *argv[])
if (drvs == NULL)
usage (EXIT_FAILURE);
- /* Add drives, inspect and mount. Note that inspector is always true,
- * and there is no -m option.
- */
+ /* Add drives, inspect and mount. */
add_drives (drvs, 'a');
if (guestfs_launch (g) == -1)
exit (EXIT_FAILURE);
- inspect_mount ();
+ if (mps != NULL)
+ mount_mps (mps);
+ else
+ inspect_mount ();
/* Free up data structures, no longer needed after this point. */
free_drives (drvs);
+ free_mps (mps);
- r = do_cat (argc - optind, &argv[optind]);
+ if (inspector)
+ r = do_cat (argc - optind, &argv[optind]);
+ else
+ r = do_cat_simple (argc - optind, &argv[optind]);
guestfs_close (g);
@@ -283,6 +300,20 @@ do_cat (int argc, char *argv[])
}
static int
+do_cat_simple (int argc, char *argv[])
+{
+ unsigned errors = 0;
+ int i;
+
+ for (i = 0; i < argc; ++i) {
+ if (guestfs_download (g, argv[i], "/dev/stdout") == -1)
+ errors++;
+ }
+
+ return errors == 0 ? 0 : -1;
+}
+
+static int
is_windows (guestfs_h *g, const char *root)
{
char *type;
diff --git a/cat/virt-cat.pod b/cat/virt-cat.pod
index 9824a83..e06a961 100644
--- a/cat/virt-cat.pod
+++ b/cat/virt-cat.pod
@@ -126,6 +126,42 @@ security problem with malicious guests (CVE-2010-3851).
Read key or passphrase parameters from stdin. The default is
to try to read passphrases from the user by opening C</dev/tty>.
+=item B<-m dev[:mountpoint[:options[:fstype]]]>
+
+=item B<--mount dev[:mountpoint[:options[:fstype]]]>
+
+Mount the named partition or logical volume on the given mountpoint.
+
+If the mountpoint is omitted, it defaults to C</>.
+
+Specifying any mountpoint disables the inspection of the guest and
+the mount of its root and all of its mountpoints, so make sure
+to mount all the mountpoints needed to work with the filenames
+gives as arguments.
+
+If you don't know what filesystems a disk image contains, you can
+either run guestfish without this option, then list the partitions,
+filesystems and LVs available (see L</list-partitions>,
+L</list-filesystems> and L</lvs> commands), or you can use the
+L<virt-filesystems(1)> program.
+
+The third (and rarely used) part of the mount parameter is the list of
+mount options used to mount the underlying filesystem. If this is not
+given, then the mount options are either the empty string or C<ro>
+(the latter if the I<--ro> flag is used). By specifying the mount
+options, you override this default choice. Probably the only time you
+would use this is to enable ACLs and/or extended attributes if the
+filesystem can support them:
+
+ -m /dev/sda1:/:acl,user_xattr
+
+Using this flag is equivalent to using the C<mount-options> command.
+
+The fourth part of the parameter is the filesystem driver to use, such
+as C<ext3> or C<ntfs>. This is rarely needed, but can be useful if
+multiple drivers are valid for a filesystem (eg: C<ext2> and
C<ext3>),
+or if libguestfs misidentifies a filesystem.
+
=item B<-v>
=item B<--verbose>
--
1.9.3