* docs/grub.texi (Invoking grub-mount): New section.
Reported by: Filipus Klutiero. Fixes Debian bug #666427.
This commit is contained in:
Colin Watson
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2 changed files with 95 additions and 1 deletions
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@ -1,3 +1,8 @@
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2013-01-03 Colin Watson <cjwatson@ubuntu.com>
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* docs/grub.texi (Invoking grub-mount): New section.
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Reported by: Filipus Klutiero. Fixes Debian bug #666427.
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2013-01-02 Colin Watson <cjwatson@ubuntu.com>
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* grub-core/tests/lib/test.c (grub_test_run): Return non-zero on
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@ -20,7 +20,7 @@
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This manual is for GNU GRUB (version @value{VERSION},
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@value{UPDATED}).
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Copyright @copyright{} 1999,2000,2001,2002,2004,2006,2008,2009,2010,2011,2012 Free Software Foundation, Inc.
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Copyright @copyright{} 1999,2000,2001,2002,2004,2006,2008,2009,2010,2011,2012,2013 Free Software Foundation, Inc.
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@quotation
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Permission is granted to copy, distribute and/or modify this document
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@ -37,6 +37,7 @@ Invariant Sections.
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* grub-mkconfig: (grub)Invoking grub-mkconfig. Generate GRUB configuration
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* grub-mkpasswd-pbkdf2: (grub)Invoking grub-mkpasswd-pbkdf2.
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* grub-mkrescue: (grub)Invoking grub-mkrescue. Make a GRUB rescue image
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* grub-mount: (grub)Invoking grub-mount. Mount a file system using GRUB
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* grub-probe: (grub)Invoking grub-probe. Probe device information
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@end direntry
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@ -101,6 +102,7 @@ This edition documents version @value{VERSION}.
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* Invoking grub-mkpasswd-pbkdf2::
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Generate GRUB password hashes
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* Invoking grub-mkrescue:: Make a GRUB rescue image
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* Invoking grub-mount:: Mount a file system using GRUB
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* Invoking grub-probe:: Probe device information for GRUB
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* Obtaining and Building GRUB:: How to obtain and build GRUB
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* Reporting bugs:: Where you should send a bug report
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@ -4830,6 +4832,93 @@ built-in default.
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@end table
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@node Invoking grub-mount
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@chapter Invoking grub-mount
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The program @command{grub-mount} performs a read-only mount of any file
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system or file system image that GRUB understands, using GRUB's file system
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drivers via FUSE. (It is only available if FUSE development files were
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present when GRUB was built.) This has a number of uses:
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@itemize @bullet
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@item
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It provides a convenient way to check how GRUB will view a file system at
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boot time. You can use normal command-line tools to compare that view with
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that of your operating system, making it easy to find bugs.
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@item
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It offers true read-only mounts. Linux does not have these for journalling
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file systems, because it will always attempt to replay the journal at mount
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time; while you can temporarily mark the block device read-only to avoid
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this, that causes the mount to fail. Since GRUB intentionally contains no
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code for writing to file systems, it can easily provide a guaranteed
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read-only mount mechanism.
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@item
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It allows you to examine any file system that GRUB understands without
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needing to load additional modules into your running kernel, which may be
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useful in constrained environments such as installers.
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@item
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Since it can examine file system images (contained in regular files) just as
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easily as file systems on block devices, you can use it to inspect any file
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system image that GRUB understands with only enough privileges to use FUSE,
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even if nobody has yet written a FUSE module specifically for that file
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system type.
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@end itemize
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Using @command{grub-mount} is normally as simple as:
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@example
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grub-mount /dev/sda1 /mnt
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@end example
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@command{grub-mount} must be given one or more images and a mount point as
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non-option arguments (if it is given more than one image, it will treat them
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as a RAID set), and also accepts the following options:
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@table @option
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@item --help
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Print a summary of the command-line options and exit.
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@item --version
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Print the version number of GRUB and exit.
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@item -C
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@itemx --crypto
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Mount encrypted devices, prompting for a passphrase if necessary.
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@item -d @var{string}
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@itemx --debug=@var{string}
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Show debugging output for conditions matching @var{string}.
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@item -K prompt|@var{file}
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@itemx --zfs-key=prompt|@var{file}
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Load a ZFS encryption key. If you use @samp{prompt} as the argument,
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@command{grub-mount} will read a passphrase from the terminal; otherwise, it
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will read key material from the specified file.
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@item -r @var{device}
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@itemx --root=@var{device}
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Set the GRUB root device to @var{device}. You do not normally need to set
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this; @command{grub-mount} will automatically set the root device to the
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root of the supplied file system.
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If @var{device} is just a number, then it will be treated as a partition
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number within the supplied image. This means that, if you have an image of
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an entire disk in @file{disk.img}, then you can use this command to mount
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its second partition:
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@example
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grub-mount -r 2 disk.img mount-point
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@end example
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@item -v
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@itemx --verbose
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Print verbose messages.
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@end table
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@node Invoking grub-probe
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@chapter Invoking grub-probe
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