From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Javier Martinez Canillas <javierm@redhat.com>
Date: Mon, 10 Dec 2018 13:11:58 +0100
Subject: [PATCH] Make grub2-mkconfig to honour GRUB_CMDLINE_LINUX in
 /etc/default/grub

The kernelopts grub environment variable is set with the GRUB_CMDLINE_LINUX
value only if wasn't set before. This is because the kernel cmdline params
of the entries are not in the grub.cfg anymore so grub2-mkconfig shouldn't
have side effects on neither the entries nor their kernel cmdline params.

But there's a lot of documentation pointing at modifying GRUB_CMDLINE_LINUX
to change the kernel cmdline params and users have built a muscle memory on
it, so the BLS support should be compatible.

Make the grub2-mkconfig script update the $kernelopts environment variable
unless the --no-grubenv-update option is used.

Resolves: rhbz#1637875

Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
---
 util/grub-mkconfig.8        | 4 ++++
 util/grub-mkconfig.in       | 6 ++++++
 util/grub.d/10_linux.in     | 2 +-
 util/grub.d/10_linux_bls.in | 2 +-
 4 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/util/grub-mkconfig.8 b/util/grub-mkconfig.8
index a2d1f577b..434fa4ded 100644
--- a/util/grub-mkconfig.8
+++ b/util/grub-mkconfig.8
@@ -13,5 +13,9 @@
 \fB--output\fR=\fIFILE\fR
 Write generated output to \fIFILE\fR.
 
+.TP
+\fB--no-grubenv-update\fR
+Do not update variables in the grubenv file.
+
 .SH SEE ALSO
 .BR "info grub"
diff --git a/util/grub-mkconfig.in b/util/grub-mkconfig.in
index c20171919..5e643e169 100644
--- a/util/grub-mkconfig.in
+++ b/util/grub-mkconfig.in
@@ -50,6 +50,8 @@ grub_get_kernel_settings="${sbindir}/@grub_get_kernel_settings@"
 export TEXTDOMAIN=@PACKAGE@
 export TEXTDOMAINDIR="@localedir@"
 
+export GRUB_GRUBENV_UPDATE="yes"
+
 . "${pkgdatadir}/grub-mkconfig_lib"
 
 # Usage: usage
@@ -59,6 +61,7 @@ usage () {
     gettext "Generate a grub config file"; echo
     echo
     print_option_help "-o, --output=$(gettext FILE)" "$(gettext "output generated config to FILE [default=stdout]")"
+    print_option_help "--no-grubenv-update" "$(gettext "do not update variables in the grubenv file")"
     print_option_help "-h, --help" "$(gettext "print this message and exit")"
     print_option_help "-v, --version" "$(gettext "print the version information and exit")"
     echo
@@ -94,6 +97,9 @@ do
     --output=*)
 	grub_cfg=`echo "$option" | sed 's/--output=//'`
 	;;
+    --no-grubenv-update)
+	GRUB_GRUBENV_UPDATE="no"
+	;;
     -*)
 	gettext_printf "Unrecognized option \`%s'\n" "$option" 1>&2
 	usage
diff --git a/util/grub.d/10_linux.in b/util/grub.d/10_linux.in
index b54d2774a..da2992ac9 100644
--- a/util/grub.d/10_linux.in
+++ b/util/grub.d/10_linux.in
@@ -165,7 +165,7 @@ if [ -s \$prefix/grubenv ]; then
 fi
 EOF
 
-    if ! grub2-editenv - list | grep -q kernelopts; then
+    if [ "x${GRUB_GRUBENV_UPDATE}" = "xyes" ]; then
 	${grub_editenv} - set kernelopts="root=${linux_root_device_thisversion} ro ${args}"
     fi
 
diff --git a/util/grub.d/10_linux_bls.in b/util/grub.d/10_linux_bls.in
index 8cff4c58a..175bedd07 100644
--- a/util/grub.d/10_linux_bls.in
+++ b/util/grub.d/10_linux_bls.in
@@ -225,7 +225,7 @@ linux_entry ()
     populate_header_warn
     populate_menu
 
-    if ! grub2-editenv - list | grep -q kernelopts; then
+    if [ "x${GRUB_GRUBENV_UPDATE}" = "xyes" ]; then
 	${grub_editenv} - set kernelopts="root=${linux_root_device_thisversion} ro ${args}"
     fi