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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Javier Martinez Canillas <javierm@redhat.com>
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Date: Tue, 6 Jul 2021 00:38:40 +0200
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Subject: [PATCH] templates: Check for EFI at runtime instead of config
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generation time
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The 30_uefi-firmware template checks if an OsIndicationsSupported UEFI var
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exists and EFI_OS_INDICATIONS_BOOT_TO_FW_UI bit is set, to decide whether
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a "fwsetup" menu entry would be added or not to the GRUB menu.
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But this has the problem that it will only work if the configuration file
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was created on an UEFI machine that supports booting to a firmware UI.
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This for example doesn't support creating GRUB config files when executing
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on systems that support both UEFI and legacy BIOS booting. Since creating
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the config file from legacy BIOS wouldn't allow to access the firmware UI.
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To prevent this, make the template to unconditionally create the grub.cfg
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snippet but check at runtime if was booted through UEFI to decide if this
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entry should be added. That way it won't be added when booting with BIOS.
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There's no need to check if EFI_OS_INDICATIONS_BOOT_TO_FW_UI bit is set,
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since that's already done by the "fwsetup" command when is executed.
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Resolves: rhbz#1823864
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Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
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---
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util/grub.d/30_uefi-firmware.in | 21 ++++++++-------------
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1 file changed, 8 insertions(+), 13 deletions(-)
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diff --git a/util/grub.d/30_uefi-firmware.in b/util/grub.d/30_uefi-firmware.in
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index d344d3883d7..b6041b55e2a 100644
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--- a/util/grub.d/30_uefi-firmware.in
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+++ b/util/grub.d/30_uefi-firmware.in
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@@ -26,19 +26,14 @@ export TEXTDOMAINDIR="@localedir@"
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. "$pkgdatadir/grub-mkconfig_lib"
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-EFI_VARS_DIR=/sys/firmware/efi/efivars
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-EFI_GLOBAL_VARIABLE=8be4df61-93ca-11d2-aa0d-00e098032b8c
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-OS_INDICATIONS="$EFI_VARS_DIR/OsIndicationsSupported-$EFI_GLOBAL_VARIABLE"
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+LABEL="UEFI Firmware Settings"
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-if [ -e "$OS_INDICATIONS" ] && \
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- [ "$(( $(printf 0x%x \'"$(cat $OS_INDICATIONS | cut -b5)"\') & 1 ))" = 1 ]; then
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- LABEL="UEFI Firmware Settings"
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+gettext_printf "Adding boot menu entry for UEFI Firmware Settings ...\n" >&2
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- gettext_printf "Adding boot menu entry for UEFI Firmware Settings ...\n" >&2
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-
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- cat << EOF
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-menuentry '$LABEL' \$menuentry_id_option 'uefi-firmware' {
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- fwsetup
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-}
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-EOF
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+cat << EOF
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+if [ "\$grub_platform" = "efi" ]; then
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+ menuentry '$LABEL' \$menuentry_id_option 'uefi-firmware' {
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+ fwsetup
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+ }
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fi
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+EOF
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