grubby-bs: Fix changing kernel cmdline params not working on ppc64le

Currently the grubby script re-generates a GRUB config file that contains
menuentry commands for every /boot/loader/entries/*.conf file snippet.

But this is only needed for ppc64le machines that have a Petitboot version
that doesn't support parsing BLS snippets. Instead of generating a config
on any ppc64le machine, restrict this for the case where is really needed.

The /etc/grub.d/10_linux script already takes this into account and does
not add menuentry commands unless is needed. But the grubby script didn't
check this, causing changing kernel cmdline params to not work on ppc64le.

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

grubby-bls

@@ -581,7 +581,32 @@ remove_var_prefix() {
 
 update_grubcfg()
 {
-    if [[ $arch = 'ppc64' || $arch = 'ppc64le' ]]; then
+    # Older ppc64le OPAL firmware (petitboot version < 1.8.0) don't have BLS support
+    # so grub2-mkconfig has to be run to generate a config with menuentry commands.
+    if [ "${arch}" = "ppc64le" ] && [ -d /sys/firmware/opal ]; then
+        RUN_MKCONFIG="true"
+        petitboot_path="/sys/firmware/devicetree/base/ibm,firmware-versions/petitboot"
+
+        if test -e ${petitboot_path}; then
+            read -r -d '' petitboot_version < ${petitboot_path}
+            petitboot_version="$(echo ${petitboot_version//v})"
+
+            if test -n ${petitboot_version}; then
+                major_version="$(echo ${petitboot_version} | cut -d . -f1)"
+                minor_version="$(echo ${petitboot_version} | cut -d . -f2)"
+
+                re='^[0-9]+$'
+                if [[ $major_version =~ $re ]] && [[ $minor_version =~ $re ]] &&
+                       ([[ ${major_version} -gt 1 ]] ||
+                            [[ ${major_version} -eq 1 &&
+                                 ${minor_version} -ge 8  ]]); then
+                    RUN_MKCONFIG="false"
+                fi
+            fi
+        fi
+    fi
+
+    if [[ $RUN_MKCONFIG = "true" ]]; then
         grub2-mkconfig --no-grubenv-update -o "${grub_config}" >& /dev/null
     fi
 }

grubby.spec

@@ -1,6 +1,6 @@
 Name: grubby
 Version: 8.40
-Release: 51%{?dist}
+Release: 52%{?dist}
 Summary: Command line tool for updating bootloader configs
 License: GPLv2+
 URL: https://github.com/rhinstaller/grubby
@@ -131,6 +131,9 @@ current boot environment.
  %{_mandir}/man8/*.8*
 
 %changelog
+* Mon Apr 26 2021 Javier Martinez Canillas <javierm@redhat.com> - 8.40-52
+- grubby-bs: Fix changing kernel cmdline params not working on ppc64le
+
 * Tue Jan 26 2021 Fedora Release Engineering <releng@fedoraproject.org> - 8.40-51
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_34_Mass_Rebuild