[bug#45225] [PATCH] gnu: grub: Fix unicode font loading when booting over TFTP.

[Stefan <stefan-guix@vodafonemail.de>]

* gnu/bootloader/grub.scm (font-file): Using (canonicalize-path), as symlinks
 from a bootloader profile do not work on a tftp server when network booting.
---
gnu/bootloader/grub.scm | 15 ++++++++++++---
1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/gnu/bootloader/grub.scm b/gnu/bootloader/grub.scm
index af7b7561ff..3177452dfb 100644
--- a/gnu/bootloader/grub.scm
+++ b/gnu/bootloader/grub.scm
@@ -191,9 +191,18 @@ fi~%"
  (define font-file
    (let* ((bootloader (bootloader-configuration-bootloader config))
           (grub (bootloader-package bootloader)))
-      (normalize-file (file-append grub "/share/grub/unicode.pf2")
-                      store-mount-point
-                      store-directory-prefix)))
+      ;; The bootloader-package may be a profile with only symlinks.
+      ;; If network booting, then a symlink to the font may not work on the
+      ;; server side.  Therefore we canonicalize the file name of the font.
+      ;; TODO:  The font gets installed by (install-grub-efi-netboot) and
+      ;; (install-grub-efi).  The installed font could be referred to as
+      ;; "unicode".  But it is currently unclear if (install-grub-disk-image)
+      ;; and (install-grub) both install the font as well.
+      ;; Actually this should be preferred.
+      #~(canonicalize-path
+         #+(normalize-file (file-append grub "/share/grub/unicode.pf2")
+                           store-mount-point
+                           store-directory-prefix))))

  (define image
    (normalize-file (grub-background-image config)
-- 
2.29.2