Build modules.img at module build time

This will make package installation a little faster, more reproducible
(mkfs.ext3 -d is easier to make/replace with reproducible tool than
kernel driver), and also make disk space estimation more accurate.

(cherry picked from commit eb4c9ed)
(cherry picked from commit 1fe8359)

kernel.spec.in

@@ -53,6 +53,7 @@ BuildRequires:  gcc-plugin-devel
 BuildRequires:  elfutils-libelf-devel
 BuildRequires:  bison
 BuildRequires:  flex
+BuildRequires:  e2fsprogs
 
 # gcc with support for BTI mitigation
 %if 0%{?fedora} == 23
@@ -389,6 +390,19 @@ 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
 
+# include kernel+initramfs also inside modules.img, for direct kernel boot with
+# stubdomain
+cp %buildroot%vm_install_dir/vmlinuz %buildroot%vm_install_dir/modules/
+cp %buildroot%vm_install_dir/initramfs %buildroot%vm_install_dir/modules/
+if [ -n "$SOURCE_DATE_EPOCH" ]; then
+    find %buildroot%vm_install_dir/modules \
+       -exec touch --no-dereference --date="@${SOURCE_DATE_EPOCH}" {} +
+fi
+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
+
 # 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
 do
@@ -484,19 +498,6 @@ Qubes domU kernel.
 
 %post qubes-vm
 
-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
-
 %if "%{name_suffix}" == ""
 # Set kernel as default VM kernel if we are the default package.
 
@@ -523,10 +524,9 @@ exit 0
 %files qubes-vm
 %defattr(-, root, root)
 %dir %vm_install_dir
-%ghost %attr(0644, root, root) %vm_install_dir/modules.img
+%attr(0644, root, root) %vm_install_dir/modules.img
 %attr(0644, root, root) %vm_install_dir/initramfs
 %attr(0644, root, root) %vm_install_dir/vmlinuz
-%vm_install_dir/modules
 
 %changelog
 @CHANGELOG@