[PATCH 1/2] EFI: console: Do not set colorstate until the first text output

[Hans de Goede]

GRUB_MOD_INIT(normal) does an unconditional:

grub_env_set ("color_normal", "light-gray/black");

which triggers a grub_term_setcolorstate() call. The original version
of the "efi/console: Do not set text-mode until we actually need it" patch:
https://lists.gnu.org/archive/html/grub-devel/2018-03/msg00125.html

Protected against this by caching the requested state in
grub_console_setcolorstate () and then only applying it when the first
text output actually happens. During refactoring to move the
grub_console_setcolorstate () up higher in the grub-core/term/efi/console.c
file the code to cache the color-state + bail early was accidentally
dropped.

Restore the cache the color-state + bail early behavior from the original.

Cc: Javier Martinez Canillas <javierm@redhat.com>
Fixes: 2d7c3abd871f ("efi/console: Do not set text-mode until we actually need 
it")
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
 grub-core/term/efi/console.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/grub-core/term/efi/console.c b/grub-core/term/efi/console.c
index 2f1ae85ba..c44b2ac31 100644
--- a/grub-core/term/efi/console.c
+++ b/grub-core/term/efi/console.c
@@ -82,6 +82,16 @@ grub_console_setcolorstate (struct grub_term_output *term
 {
   grub_efi_simple_text_output_interface_t *o;
 
+  if (grub_efi_is_finished || text_mode != GRUB_TEXT_MODE_AVAILABLE)
+    {
+      /*
+       * Cache colorstate changes before the first text-output, this avoids
+       * "color_normal" environment writes causing a switch to textmode.
+       */
+      text_colorstate = state;
+      return;
+    }
+
   if (grub_efi_is_finished)
     return;
 
-- 
2.33.1