From 43e3295aaad5278a1e53c5282e2660b72cd76d28 Mon Sep 17 00:00:00 2001
From: "Robin H. Johnson" <robbat2@gentoo.org>
Date: Tue, 29 Dec 2015 15:29:14 -0800
Subject: [PATCH] GRUB_LINUX_KERNEL_GLOBS: configurable kernel selection

* util/grub.d/10_linux.in: Implement GRUB_LINUX_KERNEL_GLOBS
* docs/grub.texi: Document GRUB_LINUX_KERNEL_GLOBS

Signed-off-by: Robin H. Johnson <robbat2@gentoo.org>
---
 docs/grub.texi          |  5 +++++
 util/grub.d/10_linux.in | 21 +++++++++++----------
 2 files changed, 16 insertions(+), 10 deletions(-)

diff --git a/docs/grub.texi b/docs/grub.texi
index 9a25a0b..d1129ec 100644
--- a/docs/grub.texi
+++ b/docs/grub.texi
@@ -1490,6 +1490,11 @@ This option may be set to a list of GRUB module names separated by spaces.
 Each module will be loaded as early as possible, at the start of
 @file{grub.cfg}.
 
+@item GRUB_LINUX_KERNEL_GLOBS
+This option may be set to override the list of path globs used to find Linux
+kernels. The defaults vary by architecture, and generally include both
+@file{/boot} and @file{/}.
+
 @end table
 
 The following options are still accepted for compatibility with existing
diff --git a/util/grub.d/10_linux.in b/util/grub.d/10_linux.in
index 859b608..e5ac11d 100644
--- a/util/grub.d/10_linux.in
+++ b/util/grub.d/10_linux.in
@@ -145,18 +145,19 @@ EOF
 }
 
 machine=`uname -m`
-case "x$machine" in
+globs="$GRUB_LINUX_KERNEL_GLOBS"
+[ -z "$globs" ] && case "x$machine" in
     xi?86 | xx86_64)
-	list=
-	for i in /boot/vmlinuz-* /vmlinuz-* /boot/kernel-* ; do
-	    if grub_file_is_not_garbage "$i" ; then list="$list $i" ; fi
-	done ;;
-    *) 
-	list=
-	for i in /boot/vmlinuz-* /boot/vmlinux-* /vmlinuz-* /vmlinux-* /boot/kernel-* ; do
-                  if grub_file_is_not_garbage "$i" ; then list="$list $i" ; fi
-	done ;;
+	globs="/boot/vmlinuz-* /vmlinuz-* /boot/kernel-*"
+	;;
+    *)
+	globs="/boot/vmlinuz-* /boot/vmlinux-* /vmlinuz-* /vmlinux-* /boot/kernel-*"
+	;;
 esac
+list=
+for i in ${globs} ; do
+    if grub_file_is_not_garbage "$i" ; then list="$list $i" ; fi
+done
 
 case "$machine" in
     i?86) GENKERNEL_ARCH="x86" ;;
--- a/util/grub-mkconfig.in
+++ b/util/grub-mkconfig.in
@@ -252,6 +252,7 @@
   GRUB_BADRAM \
   GRUB_OS_PROBER_SKIP_LIST \
   GRUB_DISABLE_SUBMENU
+export GRUB_LINUX_KERNEL_GLOBS
 
 if test "x${grub_cfg}" != "x"; then
   rm -f "${grub_cfg}.new"