From cdefb84f0b4e7773ebf97259b6f89445f39a44d8 Mon Sep 17 00:00:00 2001
From: Hans de Goede <hdegoede@redhat.com>
Date: Tue, 26 Nov 2019 09:51:41 +0100
Subject: [PATCH 185/220] grub.d: Fix boot_indeterminate getting set on
 boot_success=0 boot

The "grub.d: Split out boot success reset from menu auto hide script"
not only moved the code to clear boot_success and boot_indeterminate
but for some reason also mixed in some broken changes to the
boot_indeterminate handling.

The boot_indeterminate var is meant to suppress the boot menu after
a reboot from either a selinux-relabel or offline-updates. These
2 special boot scenarios do not set boot_success since there is no
successfull interaction with the user. Instead they increment
boot_indeterminate, and if it is 1 and only when it is 1, so the
first reboot after a "special" boot we suppress the menu.

To ensure that we do show the menu if we somehow get stuck in a
"special" boot loop where we do special-boots without them
incrementing boot_indeterminate, the code before the
"grub.d: Split out boot success reset from menu auto hide script"
commit would increment boot_indeterminate once when it is 1, so that
even if the "special" boot reboot-loop immediately we would show the
menu on the next boot.

That commit broke this however, because it not only moves the code,
it also changes it from only "incrementing" boot_indeterminate once to
always incrementing it, except when boot_success == 1 (and we reset it).

This broken behavior causes the following problem:

1. Boot a broken kernel, system hangs, power-cycle
2. boot_success now != 1, so we increment boot_indeterminate from 0
   (unset!) to 1. User either simply tries again, or makes some changes
   but the end-result still is a system hang, power-cycle
3. Now boot_indeterminate==1 so we do not show the menu even though the
   previous boot failed -> BAD

This commit fixes this by restoring the behavior of setting
boot_indeterminate to 2 when it was 1 before.

Fixes: "grub.d: Split out boot success reset from menu auto hide script"
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
 util/grub.d/10_reset_boot_success.in | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/util/grub.d/10_reset_boot_success.in b/util/grub.d/10_reset_boot_success.in
index 6c88d93..737e1ae 100644
--- a/util/grub.d/10_reset_boot_success.in
+++ b/util/grub.d/10_reset_boot_success.in
@@ -6,18 +6,18 @@
 #
 # The boot_success var needs to be set to 1 from userspace to mark a boot successful.
 cat << EOF
-insmod increment
 # Hiding the menu is ok if last boot was ok or if this is a first boot attempt to boot the entry
 if [ "\${boot_success}" = "1" -o "\${boot_indeterminate}" = "1" ]; then
   set menu_hide_ok=1
 else
   set menu_hide_ok=0 
 fi
-# Reset boot_indeterminate after a successful boot, increment otherwise
+# Reset boot_indeterminate after a successful boot
 if [ "\${boot_success}" = "1" ] ; then
   set boot_indeterminate=0
-else
-  increment boot_indeterminate
+# Avoid boot_indeterminate causing the menu to be hidden more then once
+elif [ "\${boot_indeterminate}" = "1" ]; then
+  set boot_indeterminate=2
 fi
 # Reset boot_success for current boot 
 set boot_success=0
-- 
1.8.3.1

