[bug#38809] reopened (Re: [bug#38809] [PATCH] bootloader: grub: Add resolution override.)

[Jan Nieuwenhuizen <janneke@gnu.org>]

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GNU bug Tracking System writes:

Hi Tobias,

As reported by oscar123123 on irc, this broke guix pull

To reproduce:

--8<---------------cut here---------------start------------->8---
guix pull --commit=a23091880d4dc6115acbfa3b7ef09d731fc5abb0
--8<---------------cut here---------------end--------------->8---

Tobias reverted the commit (thanks!).

I found this test to also show the failure.

--8<---------------cut here---------------start------------->8---
make check TESTS=tests/guix-system.sh
--8<---------------cut here---------------end--------------->8---

It turns out that this test creates a grub bootsloader with #f for
config.

Attached is a new version of the patch, that is robust against this;
this being the difference:

--8<---------------cut here---------------start------------->8---
diff --git a/gnu/bootloader/grub.scm b/gnu/bootloader/grub.scm
index 55e6344285..b99f5fa4f4 100644
--- a/gnu/bootloader/grub.scm
+++ b/gnu/bootloader/grub.scm
@@ -152,10 +152,16 @@ system string---e.g., \"x86_64-linux\"."
     ;; most other modern architectures have no other mode and therefore don't
     ;; need to be switched.
     (if (string-match "^(x86_64|i[3-6]86)-" system)
-        (string-append "
-  set gfxmode=" (string-join
-                 (grub-gfxmode (bootloader-configuration-theme config))
-                 ";") "
+        (string-append
+         "
+"
+         (let ((gfxmode (and=>
+                         (and=> config bootloader-configuration-theme)
+                         grub-gfxmode)))
+           (if gfxmode
+               (string-append "set gfxmode=" (string-join gfxmode ";"))
+               "# Leave 'gfxmode' to 'auto'."))
+         "
   insmod video_bochs
   insmod video_cirrus
   insmod gfxterm
--8<---------------cut here---------------end--------------->8---

This fixes make check and I also tested that

--8<---------------cut here---------------start------------->8---
guix pull --url=$PWD
--8<---------------cut here---------------end--------------->8---

now succeeds.

Greetings,
janneke


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From 76bc0b8ef3370a4f98e63f6630c14c55613426f7 Mon Sep 17 00:00:00 2001
From: Jan Nieuwenhuizen <janneke@gnu.org>
Date: Mon, 30 Dec 2019 11:25:40 +0100
Subject: [PATCH] bootloader: grub: Add gfxmode (resolution) override.

* gnu/bootloader/grub.scm (<grub-theme>): Add `gfxmode' entry.
(eye-candy): Use it.
* doc/guix.texi (Bootloader Configuration): Document it.
---
 doc/guix.texi           | 28 ++++++++++++++++++++++++++--
 gnu/bootloader/grub.scm | 19 +++++++++++++++----
 2 files changed, 41 insertions(+), 6 deletions(-)

diff --git a/doc/guix.texi b/doc/guix.texi
index df1ba428a5..6e3f175488 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -25923,9 +25923,22 @@ must @emph{not} be an OS device name such as @file{/dev/sda1}.
 @end table
 @end deftp
 
+@cindex HDPI
+@cindex HiDPI
+@cindex resolution
 @c FIXME: Write documentation once it's stable.
-For now only GRUB has theme support. GRUB themes are created using
-the @code{grub-theme} form, which is not documented yet.
+For now only GRUB has theme support.  GRUB themes are created using
+the @code{grub-theme} form, which is not fully documented yet.
+
+@deftp {Data Type} grub-theme
+Data type representing the configuration of the GRUB theme.
+
+@table @asis
+@item @code{gfxmode} (default: @code{'("auto")})
+The GRUB @code{gfxmode} to set (a list of screen resolution strings, see
+@pxref{gfxmode,,, grub, GNU GRUB manual}).
+@end table
+@end deftp
 
 @defvr {Scheme Variable} %default-theme
 This is the default GRUB theme used by the operating system if no
@@ -25936,6 +25949,17 @@ It comes with a fancy background image displaying the GNU and Guix
 logos.
 @end defvr
 
+For example, to override the default resolution, you may use something
+like
+
+@lisp
+(bootloader
+ (grub-configuration
+ ;; @dots{}
+ (theme (grub-theme
+         (inherit %default-theme)
+         (gfxmode '("1024x786x32" "auto"))))))
+@end lisp
 
 @node Invoking guix system
 @section Invoking @code{guix system}
diff --git a/gnu/bootloader/grub.scm b/gnu/bootloader/grub.scm
index f13685ac9d..b99f5fa4f4 100644
--- a/gnu/bootloader/grub.scm
+++ b/gnu/bootloader/grub.scm
@@ -3,6 +3,7 @@
 ;;; Copyright © 2016 Chris Marusich <cmmarusich@gmail.com>
 ;;; Copyright © 2017 Leo Famulari <leo@famulari.name>
 ;;; Copyright © 2017 Mathieu Othacehe <m.othacehe@gmail.com>
+;;; Copyright © 2019 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -88,7 +89,9 @@ denoting a file name."
   (color-normal    grub-theme-color-normal
                    (default '((fg . cyan) (bg . blue))))
   (color-highlight grub-theme-color-highlight
-                   (default '((fg . white) (bg . blue)))))
+                   (default '((fg . white) (bg . blue))))
+  (gfxmode         grub-gfxmode
+                   (default '("auto"))))          ;list of string
 
 (define %background-image
   (grub-image
@@ -149,8 +152,16 @@ system string---e.g., \"x86_64-linux\"."
     ;; most other modern architectures have no other mode and therefore don't
     ;; need to be switched.
     (if (string-match "^(x86_64|i[3-6]86)-" system)
-        "
-  # Leave 'gfxmode' to 'auto'.
+        (string-append
+         "
+"
+         (let ((gfxmode (and=>
+                         (and=> config bootloader-configuration-theme)
+                         grub-gfxmode)))
+           (if gfxmode
+               (string-append "set gfxmode=" (string-join gfxmode ";"))
+               "# Leave 'gfxmode' to 'auto'."))
+         "
   insmod video_bochs
   insmod video_cirrus
   insmod gfxterm
@@ -166,7 +177,7 @@ system string---e.g., \"x86_64-linux\"."
     insmod vbe
     insmod vga
   fi
-"
+")
         ""))
 
   (define (setup-gfxterm config font-file)
-- 
2.24.0


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