Fix kmodtool for packaging mainline Linux

kmodtool currently incorrectly identifies official
RHEL kernels, as opposed to custom kernels. This
can cause the openZFS kmod RPM build to break.

The issue can be reproduced by building a set of
mainline Linux RPMs, installing them, and then
attempting to build the openZFS kmod package
against them.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Timothy Day <timday@amazon.com>
Closes #14617

scripts/kmodtool

@@ -333,36 +333,36 @@ print_customrpmtemplate ()
 {
 	for kernel in ${1}
 	do
-		if [[ -e "${buildroot}/usr/src/kernels/${kernel}" ]] ; then
-			# this looks like a Fedora/RH kernel -- print a normal template (which includes the proper BR) and be happy :)
-			kernel_versions="${kernel_versions}${kernel}___${buildroot}%{_usrsrc}/kernels/${kernel} "
+		if [[ -e "${prefix}/lib/modules/${kernel}/build/Makefile" ]]; then
+			# likely a user-build-kernel with available buildfiles
+			# fixme: we should check if uname from Makefile is the same as ${kernel}
 
-			# parse kernel versions string and print template
-			local kernel_verrelarch=${kernel%%${kernels_known_variants}}
-			print_rpmtemplate_per_kmodpkg --redhat ${kernel} ${kernel##${kernel_verrelarch}}
+			kernel_versions="${kernel_versions}${kernel}___${prefix}/lib/modules/${kernel}/build/ "
+			print_rpmtemplate_per_kmodpkg --custom "${kernel}"
 
 			# create development package
 			if [[ -n "${devel}" ]]; then
 				# create devel package including common headers
-				print_rpmtemplate_kmoddevelpkg --redhat ${kernel} ${kernel##${kernel_verrelarch}}
+				print_rpmtemplate_kmoddevelpkg --custom "${kernel}"
 
 				# create devel package
-				print_rpmtemplate_per_kmoddevelpkg --redhat ${kernel} ${kernel##${kernel_verrelarch}}
+				print_rpmtemplate_per_kmoddevelpkg --custom "${kernel}"
 			fi
-		elif [[ -e "${prefix}/lib/modules/${kernel}/build/Makefile" ]]; then
-			# likely a user-build-kernel with available buildfiles
-			# fixme: we should check if uname from Makefile is the same as ${kernel}
+		elif [[ -e "${buildroot}/usr/src/kernels/${kernel}" ]]; then
+			# this looks like a Fedora/RH kernel -- print a normal template (which includes the proper BR) and be happy :)
+			kernel_versions="${kernel_versions}${kernel}___${buildroot}%{_usrsrc}/kernels/${kernel} "
 
-			kernel_versions="${kernel_versions}${kernel}___${prefix}/lib/modules/${kernel}/build/ "
-			print_rpmtemplate_per_kmodpkg --custom "${kernel}"
+			# parse kernel versions string and print template
+			local kernel_verrelarch=${kernel%%${kernels_known_variants}}
+			print_rpmtemplate_per_kmodpkg --redhat ${kernel} ${kernel##${kernel_verrelarch}}
 
 			# create development package
 			if [[ -n "${devel}" ]]; then
 				# create devel package including common headers
-				print_rpmtemplate_kmoddevelpkg --custom "${kernel}"
+				print_rpmtemplate_kmoddevelpkg --redhat ${kernel} ${kernel##${kernel_verrelarch}}
 
 				# create devel package
-				print_rpmtemplate_per_kmoddevelpkg --custom "${kernel}"
+				print_rpmtemplate_per_kmoddevelpkg --redhat ${kernel} ${kernel##${kernel_verrelarch}}
 			fi
 		else
 			error_out 2 "Don't know how to handle ${kernel} -- ${prefix}/lib/modules/${kernel}/build/Makefile not found"