From 4f5e080c61055b04db3cdf8067cf180f193cf89f Mon Sep 17 00:00:00 2001
From: Steve Langasek <steve.langasek@ubuntu.com>
Date: Tue, 30 Oct 2018 15:04:16 -0700
Subject: If we don't have writable grubenv and we're on EFI, always show the
 menu

If we don't have writable grubenv, recordfail doesn't work, which means our
quickboot behavior - with a timeout of 0 - leaves the user without a
reliable way to access the boot menu if they're on UEFI, because unlike
BIOS, UEFI does not support checking the state of modifier keys (i.e.
holding down shift at boot is not detectable).

Handle this corner case by always using a non-zero timeout on EFI when
save_env doesn't work.

Reuse GRUB_RECORDFAIL_TIMEOUT to avoid introducing another variable.

Signed-off-by: Steve Langasek <steve.langasek@canonical.com>

Bug-Ubuntu: https://bugs.launchpad.net/bugs/1800722
Last-Update: 2019-06-24

Patch-Name: quick-boot-lvm.patch
---
 util/grub.d/00_header.in | 18 +++++++++++++++---
 1 file changed, 15 insertions(+), 3 deletions(-)

diff --git a/util/grub.d/00_header.in b/util/grub.d/00_header.in
index 674a76140..b7135b655 100644
--- a/util/grub.d/00_header.in
+++ b/util/grub.d/00_header.in
@@ -115,7 +115,7 @@ EOF
           cat <<EOF
   # GRUB lacks write support for $abstraction, so recordfail support is disabled.
 EOF
-          return
+          return 1
           ;;
       esac
     done
@@ -126,7 +126,7 @@ EOF
 	cat <<EOF
   # GRUB lacks write support for $FS, so recordfail support is disabled.
 EOF
-	return
+	return 1
 	;;
     esac
 
@@ -135,7 +135,9 @@ EOF
 EOF
   }
 
-  check_writable
+  if ! check_writable; then
+    recordfail_broken=1
+  fi
 
   cat <<EOF
 }
@@ -379,6 +381,16 @@ EOF
   fi
 fi
 EOF
+if [ "$recordfail_broken" = 1 ]; then
+  cat << EOF
+if [ \$grub_platform = efi ]; then
+  set timeout=${GRUB_RECORDFAIL_TIMEOUT:-30}
+  if [ x\$feature_timeout_style = xy ] ; then
+    set timeout_style=menu
+  fi
+fi
+EOF
+fi
 }
 
 if [ "x$GRUB_BUTTON_CMOS_ADDRESS" != "x" ]; then