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guix system: Add 'disk-image' action.

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* guix/scripts/system.scm (show-help): Add 'disk-image'.
  (guix-system)[parse-options]: Support 'disk-image' action.
  [option-arguments]: Likewise.
  Handle the 'disk-image' action.
* doc/guix.texi (Invoking guix system): Document 'disk-image'.
This commit is contained in:
Ludovic Courtès
2014-05-22 23:22:15 +02:00
parent 1e77fedb46
commit fb729425dc
2 changed files with 26 additions and 6 deletions
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doc/guix.texi
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@@ -3236,9 +3236,23 @@ Build a virtual machine that contain the operating system declared in
The VM shares its store with the host system.
@item vm-image
Return a virtual machine image of the operating system declared in
@var{file} that stands alone. Use the @option{--image-size} option to
specify the size of the image.
@itemx disk-image
Return a virtual machine or disk image of the operating system declared
in @var{file} that stands alone. Use the @option{--image-size} option
to specify the size of the image.
When using @code{vm-image}, the returned image is in qcow2 format, which
the QEMU emulator can efficiently use.
When using @code{disk-image}, a raw disk image is produced; it can be
copied as is to a USB stick, for instance. Assuming @code{/dev/sdc} is
the device corresponding to a USB stick, one can copy the image on it
using the following command:
@example
# dd if=$(guix system disk-image my-os.scm) of=/dev/sdc
@end example
@end table
@var{options} can contain any of the common build options provided by