Strict requirements on EL major/minor

This is needed for repositories to host kmod RPMs for each minor version
in a major-centric repository.

kmod/scoutfs-kmod.spec.in

@@ -3,6 +3,23 @@
 %define kmod_git_hash @@GITHASH@@
 %define kmod_git_describe @@GITDESCRIBE@@
 %define pkg_date %(date +%%Y%%m%%d)
+%define _os_version_id %(. /etc/os-release 2>/dev/null; echo "${VERSION_ID:-0.0}")
+%define os_major %(echo %{_os_version_id} | cut -d. -f1)
+%define os_minor %(echo %{_os_version_id} | grep -q '\\.' && echo %{_os_version_id} | cut -d. -f2 || echo "")
+%global pointrel_pkgs   redhat-release rocky-release almalinux-release oraclelinux-release cloudlinux-release virtuozzo-release
+%global majoronly_pkgs  centos-stream-release
+
+# --- Build the Boolean requires expression at spec-parse time ---
+%global relreq %(
+  clauses=""
+  for p in %{pointrel_pkgs}; do
+    clauses="${clauses}${p} = %{os_major}.%{os_minor} or "
+  done
+  for p in %{majoronly_pkgs}; do
+    clauses="${clauses}${p} = %{os_major}"
+  done
+  echo "(${clauses%})"
+)
 
 # take kernel version or default to uname -r
 %{!?kversion: %global kversion %(uname -r)}
@@ -27,6 +44,7 @@ Release:        %{_release}%{?dist}
 License:        GPLv2
 Group:          System/Kernel
 URL:            http://scoutfs.org/
+Requires: %{relreq}
 
 %if 0%{?el7}
 BuildRequires:  %{kernel_module_package_buildreqs}
@@ -53,22 +71,10 @@ Source:		%{kmod_name}-kmod-%{kmod_version}.tar
 %global flavors_to_build x86_64
 %endif
 
-# el9 sanity: make sure we lock to the minor release we built for and block upgrades
-%{lua:
-  if string.match(rpm.expand("%{dist}"), "%.el9") then
-    rpm.define("el9 1")
-  end
-}
-
-%if 0%{?el9}
-%define release_major_minor 9.%{lua: print(rpm.expand("%{dist}"):match("%.el9_(%d)"))}
-Requires: system-release = %{release_major_minor}
-%endif
 
 %description
 %{kmod_name} - kernel module
 
-
 %prep
 %setup -q -n %{kmod_name}-kmod-%{kmod_version}