grub2/0216-Boot-Counting.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Christian Glombek <lorbus@fedoraproject.org>
Date: Tue, 31 Jul 2018 11:12:06 +0200
Subject: [PATCH] Boot Counting

Adds 01_fallback_counting.in script to support boot counting before
falling back to the previous menu entry automatically
---
 Makefile.util.def                   |  6 ++++++
 util/grub.d/01_fallback_counting.in | 12 ++++++++++++
 2 files changed, 18 insertions(+)
 create mode 100644 util/grub.d/01_fallback_counting.in

diff --git a/Makefile.util.def b/Makefile.util.def
index cba4d500198..c8cb91308d9 100644
--- a/Makefile.util.def
+++ b/Makefile.util.def
@@ -448,6 +448,12 @@ script = {
   installdir = grubconf;
 };
 
+script = {
+  name = '01_fallback_counting';
+  common = util/grub.d/01_fallback_counting.in;
+  installdir = grubconf;
+};
+
 script = {
   name = '01_menu_auto_hide';
   common = util/grub.d/01_menu_auto_hide.in;
diff --git a/util/grub.d/01_fallback_counting.in b/util/grub.d/01_fallback_counting.in
new file mode 100644
index 00000000000..37ee9e6ee85
--- /dev/null
+++ b/util/grub.d/01_fallback_counting.in
@@ -0,0 +1,12 @@
+#! /bin/sh -e
+
+# Boot Counting
+if [ "\${boot_counter}" -a "\${boot_success}" = "0"]; then
+  if  [ "\${boot_counter}" = "0" -o "\${boot_counter}" = "-1" ]; then
+    set default=1
+    set boot_counter=-1
+  else
+    set boot_counter=$((\${boot_counter}-1))
+  fi
+  save_env boot_counter
+fi