Hi Danny,

Danny Milosavljevic <dannym@scratchpost.org> skribis:

>> I also vote for returning the ISO directly, for consistency with what
>> ‘guix system disk-image’ does for the other formats.  WDYT, Danny?  :-)
>
> Sure, I just don't know how to do that.  The other two files are
> "system" and "bootcfg" and contain some kind of list of gnu store
> paths and single-digit numbers.

They are “references graphs” files, describing the closure of the given
store items.

I gave it a stab and ended up with the attached patch, which Works For
Me™ and is not unreasonably ugly to my eye.  :-)

--8<---------------cut here---------------start------------->8---
$ ./pre-inst-env guix system disk-image -t iso9660 gnu/system/install.scm 
/gnu/store/5pk71pmjp2yshkh0xdfgsnmaxfvdsms1-image.iso
ludo@ribbon ~/src/guix/+master$ file /gnu/store/5pk71pmjp2yshkh0xdfgsnmaxfvdsms1-image.iso
/gnu/store/5pk71pmjp2yshkh0xdfgsnmaxfvdsms1-image.iso: DOS/MBR boot sector; GRand Unified Bootloader, stage1 version 0x79, boot drive 0xbb, stage2 address 0x8e70, 1st sector stage2 0xb8db31c3, stage2 segment 0x201 ISO 9660 CD-ROM filesystem data (DOS/MBR boot sector) 'GUIXSD_IMAGE' (bootable)
--8<---------------cut here---------------end--------------->8---

WDYT?

Ludo’.