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authorTobias Geerinckx-Rice <me@tobias.gr>2020-04-06 17:48:21 +0200
committerTobias Geerinckx-Rice <me@tobias.gr>2020-04-10 01:52:36 +0200
commit26c1bd9dfafb5a954d2174b7a000304cd7ae6345 (patch)
treebf25499dea24fd3f40676dbf5403d28eca92c009
parentd95252baf97adb261dd823d4e7a74a7522815c1c (diff)
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.
-rw-r--r--gnu/build/vm.scm19
1 files changed, 19 insertions, 0 deletions
diff --git a/gnu/build/vm.scm b/gnu/build/vm.scm
index 79eed48c1f..9caa110463 100644
--- a/gnu/build/vm.scm
+++ b/gnu/build/vm.scm
@@ -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"