On grub cfg updates, run grub2-mkconfig for Xen systems

Resolves: #RHEL-50691
Signed-off-by: Leo Sandoval <lsandova@redhat.com>

grubby-bls

@@ -620,6 +620,15 @@ update_grubcfg()
         fi
     fi
 
+    # PV and PVH Xen DomU guests boot with pygrub that doesn't have BLS support,
+    # also Xen Dom0 use the menuentries from 20_linux_xen and not the ones from
+    # 10_linux. So grub2-mkconfig has to run for both Xen Dom0 and DomU.
+    if [[ -e /sys/hypervisor/type ]] && grep -q "^xen$" /sys/hypervisor/type; then
+        if [ ! -e /sys/hypervisor/guest_type ] || ! grep -q "^HVM$" /sys/hypervisor/guest_type; then
+            RUN_MKCONFIG=true
+        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: 64%{?dist}
+Release: 65%{?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
+* Thu Dec 05 2024 Leo Sandoval <lsandova@redhat.com> - 8.40-65
+- On grub cfg updates, run grub2-mkconfig for Xen systems
+  Resolves: #RHEL-50691
+
 * Wed Jan 10 2024 Marta Lewandowska <mlewando@redhat.com> - 8.40-64
 - Do not overwrite all vars that start with GRUB_CMDLINE_LINUX
 - Resolves: #RHEL-21301