grubby-bls: don't update grubenv when generating grub.cfg for ppc64le

Since PowerNV machines can have a Petitboot versions that still don't have
BLS support, grubby re-generates the grub.cfg file on all ppc64le machines.

But this has the side effect that the grubenv file is updated, which will
overwrite any value that was set by grubby itself. To prevent that run the
grub2-mkconfig with the --no-grubenv-update option.

Related: rhbz#1726514

Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>

grubby-bls

@@ -572,7 +572,7 @@ remove_var_prefix() {
 update_grubcfg()
 {
     if [[ $arch = 'ppc64' || $arch = 'ppc64le' ]]; then
-	grub2-mkconfig -o "${grub_config}" >& /dev/null
+	grub2-mkconfig --no-grubenv-update -o "${grub_config}" >& /dev/null
     fi
 }
 

grubby.spec

@@ -1,6 +1,6 @@
 Name: grubby
 Version: 8.40
-Release: 37%{?dist}
+Release: 38%{?dist}
 Summary: Command line tool for updating bootloader configs
 License: GPLv2+
 URL: https://github.com/rhinstaller/grubby
@@ -131,6 +131,10 @@ current boot environment.
  %{_mandir}/man8/*.8*
 
 %changelog
+* Fri Nov 29 2019 Javier Martinez Canillas <javierm@redhat.com> - 8.40-38
+- grubby-bls: don't update grubenv when generating grub.cfg for ppc64le
+  Related: rhbz#1726514
+
 * Thu Nov 28 2019 Javier Martinez Canillas <javierm@redhat.com> - 8.40-37
 - grubby-bls: don't print rpm-sort error messages
   Resolves: rhbz#1731924