grub: Quote the gfxmode value set.

Previously, when setting multiple graphic modes, the expanded config would
read set gfxmode mode1;mode2;..., that is, the value was not quoted so only
the first one would be used, GRUB terminating the command on the first ';'
encountered.

* gnu/bootloader/grub.scm (eye-candy): Format gfxmode textually (as write
would), with ~s, so that it appears as a double-quoted string.

Fixes: <https://issues.guix.gnu.org/80666>
Reported-by: Martin Flack <martin.flack@gmail.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/gnu/bootloader/grub.scm b/gnu/bootloader/grub.scm
index e7414476f3e..79b9a1cac6f 100644
--- a/gnu/bootloader/grub.scm
+++ b/gnu/bootloader/grub.scm
@@ -190,7 +190,7 @@ prepend to any store file name."
     (if (memq 'gfxterm (bootloader-configuration-terminal-outputs config))
         #~(format #f "
 if loadfont unicode; then
-  set gfxmode=~a
+  set gfxmode=~s
   insmod all_video
   insmod gfxterm
 fi~%"