rpm: build modules.img at package build time only on new system

Older mkfs.ext3 doesn't have -d option.
This in practice revert eb4c9ed "Build modules.img at module build time"
on older systems.

(cherry picked from commit fd14ac9)

kernel.spec.in

@@ -403,6 +403,7 @@ cp -a %buildroot/lib/firmware/%kernelrelease %buildroot%vm_install_dir/modules/f
 rm -f %buildroot%vm_install_dir/modules/%kernelrelease/build
 cp -a %buildroot/%src_install_dir %buildroot%vm_install_dir/modules/%kernelrelease/build
 
+%if 0%{?fedora} >= 25
 # include kernel+initramfs also inside modules.img, for direct kernel boot with
 # stubdomain
 cp %buildroot%vm_install_dir/vmlinuz %buildroot%vm_install_dir/modules/
@@ -415,6 +416,7 @@ PATH="/sbin:$PATH" mkfs.ext3 -d %buildroot%vm_install_dir/modules \
       -U dcee2318-92bd-47a5-a15d-e79d1412cdce \
       %buildroot%vm_install_dir/modules.img 500M
 rm -rf %buildroot%vm_install_dir/modules
+%endif
 
 # remove files that will be auto generated by depmod at rpm -i time
 for i in alias alias.bin ccwmap dep dep.bin ieee1394map inputmap isapnpmap ofmap pcimap seriomap symbols symbols.bin usbmap
@@ -525,6 +527,21 @@ Qubes domU kernel.
 
 %post qubes-vm
 
+%if 0%{?fedora} < 25
+mkdir /tmp/qubes-modules-%kernelrelease
+truncate -s 500M /tmp/qubes-modules-%kernelrelease.img
+mkfs -t ext3 -F /tmp/qubes-modules-%kernelrelease.img > /dev/null
+mount /tmp/qubes-modules-%kernelrelease.img /tmp/qubes-modules-%kernelrelease -o loop
+cp -a -t /tmp/qubes-modules-%kernelrelease %vm_install_dir/modules/%kernelrelease
+mkdir /tmp/qubes-modules-%kernelrelease/firmware
+cp -a -t /tmp/qubes-modules-%kernelrelease/firmware %vm_install_dir/modules/firmware/%kernelrelease
+cp %vm_install_dir/vmlinuz /tmp/qubes-modules-%kernelrelease/
+cp %vm_install_dir/initramfs /tmp/qubes-modules-%kernelrelease/
+umount /tmp/qubes-modules-%kernelrelease
+rmdir /tmp/qubes-modules-%kernelrelease
+mv /tmp/qubes-modules-%kernelrelease.img %vm_install_dir/modules.img
+%endif
+
 %if "%{name_suffix}" == ""
 # Set kernel as default VM kernel if we are the default package.
 
@@ -551,9 +568,16 @@ exit 0
 %files qubes-vm
 %defattr(-, root, root)
 %dir %vm_install_dir
+%if 0%{?fedora} < 25
+%ghost %attr(0644, root, root) %vm_install_dir/modules.img
+%else
 %attr(0644, root, root) %vm_install_dir/modules.img
+%endif
 %attr(0644, root, root) %vm_install_dir/initramfs
 %attr(0644, root, root) %vm_install_dir/vmlinuz
+%if 0%{?fedora} < 25
+%vm_install_dir/modules
+%endif
 %attr(0644, root, root) %vm_install_dir/default-kernelopts-common.txt
 
 %changelog