Info Catalog grub: Invoking grub-mkrescue grub: Top grub: Invoking grub-probe

grub: Invoking grub-mount

 
 28 Invoking grub-mount
 **********************
 
 The program 'grub-mount' performs a read-only mount of any file system
 or file system image that GRUB understands, using GRUB's file system
 drivers via FUSE. (It is only available if FUSE development files were
 present when GRUB was built.)  This has a number of uses:
 
    * It provides a convenient way to check how GRUB will view a file
      system at boot time.  You can use normal command-line tools to
      compare that view with that of your operating system, making it
      easy to find bugs.
 
    * It offers true read-only mounts.  Linux does not have these for
      journalling file systems, because it will always attempt to replay
      the journal at mount time; while you can temporarily mark the block
      device read-only to avoid this, that causes the mount to fail.
      Since GRUB intentionally contains no code for writing to file
      systems, it can easily provide a guaranteed read-only mount
      mechanism.
 
    * It allows you to examine any file system that GRUB understands
      without needing to load additional modules into your running
      kernel, which may be useful in constrained environments such as
      installers.
 
    * Since it can examine file system images (contained in regular
      files) just as easily as file systems on block devices, you can use
      it to inspect any file system image that GRUB understands with only
      enough privileges to use FUSE, even if nobody has yet written a
      FUSE module specifically for that file system type.
 
    Using 'grub-mount' is normally as simple as:
 
      grub-mount /dev/sda1 /mnt
 
    'grub-mount' must be given one or more images and a mount point as
 non-option arguments (if it is given more than one image, it will treat
 them as a RAID set), and also accepts the following options:
 
 '--help'
      Print a summary of the command-line options and exit.
 
 '--version'
      Print the version number of GRUB and exit.
 
 '-C'
 '--crypto'
      Mount encrypted devices, prompting for a passphrase if necessary.
 
 '-d STRING'
 '--debug=STRING'
      Show debugging output for conditions matching STRING.
 
 '-K prompt|FILE'
 '--zfs-key=prompt|FILE'
      Load a ZFS encryption key.  If you use 'prompt' as the argument,
      'grub-mount' will read a passphrase from the terminal; otherwise,
      it will read key material from the specified file.
 
 '-r DEVICE'
 '--root=DEVICE'
      Set the GRUB root device to DEVICE.  You do not normally need to
      set this; 'grub-mount' will automatically set the root device to
      the root of the supplied file system.
 
      If DEVICE is just a number, then it will be treated as a partition
      number within the supplied image.  This means that, if you have an
      image of an entire disk in 'disk.img', then you can use this
      command to mount its second partition:
 
           grub-mount -r 2 disk.img mount-point
 
 '-v'
 '--verbose'
      Print verbose messages.
 

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