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[Libguestfs] [PATCH] ls: add -m option



Implement the -m/--mount as available in guestfish to override the
automatic introspection and specify which partitions to mount instead.
---
 cat/ls.c        | 25 +++++++++++++++++++------
 cat/virt-ls.pod | 36 ++++++++++++++++++++++++++++++++++++
 2 files changed, 55 insertions(+), 6 deletions(-)

diff --git a/cat/ls.c b/cat/ls.c
index 97022c5..38acc4d 100644
--- a/cat/ls.c
+++ b/cat/ls.c
@@ -102,6 +102,8 @@ usage (int status)
              "  -h|--human-readable  Human-readable sizes in output\n"
              "  --keys-from-stdin    Read passphrases from stdin\n"
              "  -l|--long            Long listing\n"
+             "  -m|--mount dev[:mnt[:opts[:fstype]]]\n"
+             "                       Mount dev on mnt (if omitted, /)\n"
              "  -R|--recursive       Recursive listing\n"
              "  --times              Display file times\n"
              "  --time-days          Display file times as days before now\n"
@@ -130,7 +132,7 @@ main (int argc, char *argv[])
 
   enum { HELP_OPTION = CHAR_MAX + 1 };
 
-  static const char *options = "a:c:d:hlRvVx";
+  static const char *options = "a:c:d:hlm:RvVx";
   static const struct option long_options[] = {
     { "add", 1, 0, 'a' },
     { "checksum", 2, 0, 0 },
@@ -147,6 +149,7 @@ main (int argc, char *argv[])
     { "keys-from-stdin", 0, 0, 0 },
     { "long", 0, 0, 'l' },
     { "long-options", 0, 0, 0 },
+    { "mount", 1, 0, 'm' },
     { "recursive", 0, 0, 'R' },
     { "time", 0, 0, 0 },
     { "times", 0, 0, 0 },
@@ -161,6 +164,9 @@ main (int argc, char *argv[])
   };
   struct drv *drvs = NULL;
   struct drv *drv;
+  struct mp *mps = NULL;
+  struct mp *mp;
+  char *p;
   const char *format = NULL;
   int c;
   int option_index;
@@ -247,6 +253,11 @@ main (int argc, char *argv[])
       mode |= MODE_LS_L;
       break;
 
+    case 'm':
+      OPTION_m;
+      inspector = 0;
+      break;
+
     case 'R':
       mode |= MODE_LS_R;
       break;
@@ -313,7 +324,7 @@ main (int argc, char *argv[])
    * values.
    */
   assert (read_only == 1);
-  assert (inspector == 1);
+  assert (inspector == 1 || mps != NULL);
   assert (live == 0);
 
   /* Many flags only apply to -lR mode. */
@@ -342,18 +353,20 @@ 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);
 
   unsigned errors = 0;
 
diff --git a/cat/virt-ls.pod b/cat/virt-ls.pod
index be955d3..b7b676e 100644
--- a/cat/virt-ls.pod
+++ b/cat/virt-ls.pod
@@ -357,6 +357,42 @@ L</RECURSIVE LONG LISTING> above.
 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<-l>
 
 =item B<--long>
-- 
1.9.3


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