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[bug#40514] [PATCH] vm: Transparently compress iso9660 images.
From: |
Tobias Geerinckx-Rice |
Subject: |
[bug#40514] [PATCH] vm: Transparently compress iso9660 images. |
Date: |
Wed, 8 Apr 2020 23:01:32 +0200 |
* gnu/build/vm.scm (make-iso9660-image): Use the ‘--zisofs’ xorriso
filter at the highest compression settings for supported directories.
---
gnu/build/vm.scm | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/gnu/build/vm.scm b/gnu/build/vm.scm
index 79eed48c1f..972eb4bdf9 100644
--- a/gnu/build/vm.scm
+++ b/gnu/build/vm.scm
@@ -533,6 +533,24 @@ 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"
--
2.25.2