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vm: Transparently compress iso9660 images. 

* gnu/build/vm.scm (make-iso9660-image): Use the ‘--zisofs’ xorriso
filter at the highest compression settings for supported directories.
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Tobias Geerinckx-Rice 2020-04-06 17:48:21 +02:00 committed by Ludovic Courtès
parent 08b14ab20e
commit e830c2a8de
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gnu/build/vm.scm
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@ -5,6 +5,7 @@
;;; Copyright © 2017 Mathieu Othacehe <m.othacehe@gmail.com>
;;; Copyright © 2017 Marius Bakke <mbakke@fastmail.com>
;;; Copyright © 2018 Chris Marusich <cmmarusich@gmail.com>
;;; Copyright © 2020 Tobias Geerinckx-Rice <me@tobias.gr>
;;;
;;; This file is part of GNU Guix.
;;;
@ -533,6 +534,24 @@ GRUB configuration and OS-DRV as the stuff in it."
;; Set all timestamps to 1.
"-volume_date" "all_file_dates" "=1"
;; ‘zisofs’ compression reduces the total image size by ~60%.
"-zisofs" "level=9:block_size=128k" ; highest compression
;; It's transparent to our Linux-Libre kernel but not to GRUB.
;; Don't compress the kernel, initrd, and other files read by
;; grub.cfg, as well as common already-compressed file names.
"-find" "/" "-type" "f"
;; XXX Even after "--" above, and despite documentation claiming
;; otherwise, "-or" is stolen by grub-mkrescue which then chokes
;; on it (as ‘-o …’) and dies. Don't use "-or".
"-not" "-wholename" "/boot/*"
"-not" "-wholename" "/System/*"
"-not" "-name" "unicode.pf2"
"-not" "-name" "bzImage"
"-not" "-name" "*.gz" ; initrd & all man pages
"-not" "-name" "*.png" ; includes grub-image.png
"-exec" "set_filter" "--zisofs"
"--"
"-volid" (string-upcase volume-id)
(if volume-uuid
`("-volume_date" "uuid"