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

Resolves: #RHEL-70200
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

@@ -3,7 +3,7 @@
 
 Name: grubby
 Version: 8.40
-Release: 77%{?dist}
+Release: 78%{?dist}
 Summary: Command line tool for updating bootloader configs
 License: GPL-2.0-or-later
 Source1: grubby-bls
@@ -74,6 +74,10 @@ fi
 %{_mandir}/man8/grubby.8*
 
 %changelog
+* Thu Dec 05 2024 Leo Sandoval <lsandova@redhat.com> - 8.40-78
+- On grub cfg updates, run grub2-mkconfig for Xen systems
+  Resolves: #RHEL-70200
+
 * Tue Oct 29 2024 Troy Dawson <tdawson@redhat.com> - 8.40-77
 - Bump release for October 2024 mass rebuild:
   Resolves: RHEL-64018