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Subject: [bug#27661] [PATCH v2] build: Make ISO-9660 image bootable from USB
	flash drive.
Resent-Message-ID: <handler.27661.B27661.149986849511669@debbugs.gnu.org>
From: ludo@gnu.org (Ludovic =?UTF-8?Q?Court=C3=A8s?=)
References: <87d195etic.fsf@gnu.org>
	<20170712134405.25274-1-dannym@scratchpost.org>
Date: Wed, 12 Jul 2017 16:08:02 +0200
In-Reply-To: <20170712134405.25274-1-dannym@scratchpost.org> (Danny
	Milosavljevic's message of "Wed, 12 Jul 2017 15:44:05 +0200")
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To: Danny Milosavljevic <dannym@scratchpost.org>
Cc: 27661@debbugs.gnu.org

Danny Milosavljevic <dannym@scratchpost.org> skribis:

> * gnu/build/vm.scm (make-iso9660-image): Make image bootable from USB fla=
sh
> drive.
> ---
>  gnu/build/vm.scm | 13 +++++++++++++
>  1 file changed, 13 insertions(+)
>
> diff --git a/gnu/build/vm.scm b/gnu/build/vm.scm
> index 2d41c5756..d8c53ef37 100644
> --- a/gnu/build/vm.scm
> +++ b/gnu/build/vm.scm
> @@ -367,6 +367,19 @@ Grub configuration and OS-DRV as the stuff in it."
>                              "var=3D/tmp/root/var"
>                              "run=3D/tmp/root/run"
>                              "--"
> +                            ;; Store two copies of the headers.
> +                            ;; The resulting ISO-9660 image has a DOS MB=
R and
> +                            ;; one protective partition (with type 0xCD).
> +                            ;; Because GuixSD only uses actual partitions
> +                            ;; rather than what /proc/partitions returns=
, work
> +                            ;; around it by storing the primary volume
> +                            ;; descriptor twice, once where it should be=
 and
> +                            ;; once in the partition.
> +                            ;; Allegedly, otherwise, many other GNU tools
> +                            ;; (automounters etc) would also be confused=
 by
> +                            ;; the extra partition so it makes sense to
> +                            ;; store two copies in any case.
> +                            "-boot_image" "any" "partition_offset=3D16"

Now I understand.  :-)

Perfect, thank you!

Ludo=E2=80=99.