New commands: 'mkmountpoint' and 'rmmountpoint'

These specialized commands are used to create additional mountpoints
before mounting filesystems.  They are only used where you want to
mount several unrelated or read-only filesystems together, and need
additional care to use correctly.

Here is how to use these calls to unpack the "Russian doll" nest
of a Fedora 11 live CD:

 add-ro Fedora-11-i686-Live.iso
 run
 mkmountpoint /cd
 mkmountpoint /squash
 mkmountpoint /ext3
 mount /dev/sda /cd
 mount-loop /cd/LiveOS/squashfs.img /squash
 mount-loop /squash/LiveOS/ext3fs.img /ext3

The inner filesystem is now unpacked under the /ext3 mountpoint.

1 files changed, 36 insertions, 0 deletions

diff --git a/src/generator.ml b/src/generator.ml
index 381e0ea7..adcc4ba4 100755
--- a/src/generator.ml
+++ b/src/generator.ml
@@ -2937,6 +2937,42 @@ This call is similar to C<guestfs_mounts>.  That call returns
 a list of devices.  This one returns a hash table (map) of
 device name to directory where the device is mounted.");
 
+  ("mkmountpoint", (RErr, [String "path"]), 148, [],
+   [],
+   "create a mountpoint",
+   "\
+C<guestfs_mkmountpoint> and C<guestfs_rmmountpoint> are
+specialized calls that can be used to create extra mountpoints
+before mounting the first filesystem.
+
+These calls are I<only> necessary in some very limited circumstances,
+mainly the case where you want to mount a mix of unrelated and/or
+read-only filesystems together.
+
+For example, live CDs often contain a \"Russian doll\" nest of
+filesystems, an ISO outer layer, with a squashfs image inside, with
+an ext2/3 image inside that.  You can unpack this as follows
+in guestfish:
+
+ add-ro Fedora-11-i686-Live.iso
+ run
+ mkmountpoint /cd
+ mkmountpoint /squash
+ mkmountpoint /ext3
+ mount /dev/sda /cd
+ mount-loop /cd/LiveOS/squashfs.img /squash
+ mount-loop /squash/LiveOS/ext3fs.img /ext3
+
+The inner filesystem is now unpacked under the /ext3 mountpoint.");
+
+  ("rmmountpoint", (RErr, [String "path"]), 149, [],
+   [],
+   "remove a mountpoint",
+   "\
+This calls removes a mountpoint that was previously created
+with C<guestfs_mkmountpoint>.  See C<guestfs_mkmountpoint>
+for full details.");
+
 ]
 
 let all_functions = non_daemon_functions @ daemon_functions