dracut: split 'full' dracut module into 'full-dmroot' and 'full-modules'

When PV Grub will be used, VM initramfs should not contain /lib/modules
mounting code, as the VM root.img will already contains kernel modules.
Make it possible by splitting the module.

QubesOS/qubes-issues#1354

dracut/Makefile

@@ -1,3 +1,4 @@
 install:
 	$(MAKE) -C simple
-	$(MAKE) -C full
+	$(MAKE) -C full-dmroot
+	$(MAKE) -C full-modules

dracut/full-dmroot/Makefile

@@ -1,4 +1,4 @@
 install:
 	install -d $(DESTDIR)/usr/lib/dracut/modules.d/90qubes-vm
-	install module-setup.sh mount_modules.sh qubes_cow_setup.sh \
+	install module-setup.sh qubes_cow_setup.sh \
 		$(DESTDIR)/usr/lib/dracut/modules.d/90qubes-vm/

dracut/full-dmroot/module-setup.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 
 check() {
-    if xenstore-read qubes-vm-type &>/dev/null; then
+    if xenstore-read qubes-vm-type &>/dev/null || qubesdb-read qubes-vm-type &>/dev/null; then
         return 0
     else
         return 255
@@ -10,7 +10,6 @@ check() {
 
 install() {
     inst_hook pre-udev 90 $moddir/qubes_cow_setup.sh
-    inst_hook pre-pivot 50 $moddir/mount_modules.sh
     inst_multiple \
         sfdisk \
         mkswap

dracut/full-dmroot/qubes_cow_setup.sh

@@ -1,8 +1,8 @@
+#!/bin/sh
 #
 # This file should be places in pre-mount directory in dracut's initramfs
 #
 
-#!/bin/sh
 echo "Qubes initramfs script here:"
 
 if [ -e /dev/mapper/dmroot ] ; then 

dracut/full-modules/Makefile

@@ -0,0 +1,4 @@
+install:
+	install -d $(DESTDIR)/usr/lib/dracut/modules.d/90qubes-vm-modules
+	install module-setup.sh mount_modules.sh \
+		$(DESTDIR)/usr/lib/dracut/modules.d/90qubes-vm-modules/

dracut/full-modules/module-setup.sh

@@ -0,0 +1,9 @@
+#!/bin/bash
+
+check() {
+    return 255
+}
+
+install() {
+    inst_hook pre-pivot 50 $moddir/mount_modules.sh
+}

dracut/full-modules/mount_modules.sh

@@ -1,8 +1,8 @@
+#!/bin/sh
 #
 # This file should be places in pre-pivot directory in dracut's initramfs
 #
 
-#!/bin/sh
 
 if ! [ -d $NEWROOT/lib/modules/`uname -r` ]; then
     echo "Waiting for /dev/xvdd device..."

rpm_spec/qubes-kernel-vm-support.spec

@@ -61,6 +61,7 @@ make install-kernel-support DESTDIR=%{buildroot}
 
 %files
 /usr/lib/dracut/modules.d/90qubes-vm
+/usr/lib/dracut/modules.d/90qubes-vm-modules
 /usr/lib/dracut/modules.d/90qubes-vm-simple
 /usr/src/u2mfn-%{version}/
 /usr/sbin/qubes-prepare-vm-kernel