grub2/0256-Only-set-kernelopts-in-grubenv-if-it-wasn-t-set-befo.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Javier Martinez Canillas <javierm@redhat.com>
Date: Fri, 5 Oct 2018 16:29:47 +0200
Subject: [PATCH] Only set kernelopts in grubenv if it wasn't set before

Users may want to use a different command line parameters, so if there's
a kernelopts var set in grubenv, grub2-mkconfig shouldn't reset it.

While being there, print a warning so users know that they shouldn't edit
the grub config file and instead edit the BootLoaderSpec config files.

Resolves: rhbz#1636466

Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
---
 util/grub.d/10_linux.in     | 20 +++++++++++++++++++-
 util/grub.d/10_linux_bls.in |  4 +++-
 2 files changed, 22 insertions(+), 2 deletions(-)

diff --git a/util/grub.d/10_linux.in b/util/grub.d/10_linux.in
index 9682e97b7f5..01e66e5fc74 100644
--- a/util/grub.d/10_linux.in
+++ b/util/grub.d/10_linux.in
@@ -82,6 +82,20 @@ case x"$GRUB_FS" in
 	;;
 esac
 
+populate_header_warn()
+{
+cat <<EOF
+
+# This section was generated by a script. Do not modify the generated file - all changes
+# will be lost the next time file is regenerated. Instead edit the BootLoaderSpec files.
+#
+# The blscfg command parses the BootLoaderSpec files stored in /boot/loader/entries and
+# populates the boot menu. Please refer to the Boot Loader Specification documentation
+# for the files format: https://www.freedesktop.org/wiki/Specifications/BootLoaderSpec/.
+
+EOF
+}
+
 mktitle ()
 {
   local title_type
@@ -141,6 +155,8 @@ linux_entry ()
         prepare_grub_to_access_device ${boot_device} boot
     fi
 
+    populate_header_warn
+
     cat << EOF
 insmod blscfg
 blscfg
@@ -150,7 +166,9 @@ fi
 EOF
 
     ${grub_editenv} - set saved_entry=0
-    ${grub_editenv} - set kernelopts="root=${linux_root_device_thisversion} ro ${args}"
+    if ! grub2-editenv - list | grep -q kernelopts; then
+	${grub_editenv} - set kernelopts="root=${linux_root_device_thisversion} ro ${args}"
+    fi
 
     exit 0
   fi
diff --git a/util/grub.d/10_linux_bls.in b/util/grub.d/10_linux_bls.in
index 3cc7803c6a1..8a3379578bd 100644
--- a/util/grub.d/10_linux_bls.in
+++ b/util/grub.d/10_linux_bls.in
@@ -201,7 +201,9 @@ linux_entry ()
     populate_menu
 
     ${grub_editenv} - set saved_entry=0
-    ${grub_editenv} - set kernelopts="root=${linux_root_device_thisversion} ro ${args}"
+    if ! grub2-editenv - list | grep -q kernelopts; then
+	${grub_editenv} - set kernelopts="root=${linux_root_device_thisversion} ro ${args}"
+    fi
 
     exit 0
   fi