weak-modules: use a proper program for dumping symvers

Previously it was assumed that symvers is in gzip format, which
is no longer the case, so zcat was used.  Dispatch based on the symvers
file extension.

Resolves: RHEL-39388
Signed-off-by: Eugene Syromiatnikov <esyr@redhat.com>

kmod.spec

@@ -16,7 +16,7 @@
 
 Name:		kmod
 Version:	31
-Release:	6%{?dist}
+Release:	7%{?dist}
 Summary:	Linux kernel module management utilities
 
 # https://docs.fedoraproject.org/en-US/legal/license-field/#_no_effective_license_analysis
@@ -193,6 +193,10 @@ install -m 0644 %{SOURCE2} $RPM_BUILD_ROOT%{_sysconfdir}/depmod.d/dist.conf
 %{_libdir}/libkmod.so
 
 %changelog
+* Mon Aug 12 2024 Eugene Syromiatnikov <esyr@redhat.com> - 31-7
+- weak-modules: use either zcat or xzcat based on symvers file extension
+- Resolves: RHEL-39388
+
 * Mon Jun 24 2024 Troy Dawson <tdawson@redhat.com> - 31-6
 - Bump release for June 2024 mass rebuild
 

weak-modules

@@ -758,6 +758,7 @@ validate_weak_links() {
     # to return to caller that original proposal is not valid
     # here 0 is true, 1 is false, since it will be the return code
     local is_configuration_valid=0
+    local cat_prog
 
     tmp=$(mktemp -p $tmpdir)
     compatible_modules=()
@@ -766,7 +767,12 @@ validate_weak_links() {
         local symvers_path=$(find_symvers_file "$krel")
 
         [[ -n "$symvers_path" ]] || return
-        zcat "$symvers_path" > $tmpdir/symvers-$krel
+        cat_prog="cat"
+        case "$symvers" in
+        *.gz) cat_prog="zcat" ;;
+        *.xz) cat_prog="xzcat" ;;
+        esac
+        "$cat_prog" "$symvers_path" > $tmpdir/symvers-$krel
     fi
 
     while ((is_updates_changed)); do