Support for MEMDISK

The .iso can now be booted using Grub (memdisk from Syslinux package):

	linux16 /memdisk
	initrd16 /path/to/iso

As well as from Syslinux:

	LINUX memdisk
	INITRD path/to/iso

dracut/59-mtd.rules

@@ -0,0 +1,8 @@
+SUBSYSTEM!="block", GOTO="ps_end"
+ACTION!="add|change", GOTO="ps_end"
+# Also don't process disks that are slated to be a multipath device
+ENV{DM_MULTIPATH_DEVICE_PATH}=="?*", GOTO="ps_end"
+
+KERNEL=="mtdblock[0-9]*", IMPORT BLKID
+
+LABEL="ps_end"

dracut/61-mtd.rules

@@ -0,0 +1,20 @@
+SUBSYSTEM!="block", GOTO="pss_end"
+ACTION!="add|change", GOTO="pss_end"
+# Also don't process disks that are slated to be a multipath device
+ENV{DM_MULTIPATH_DEVICE_PATH}=="?*", GOTO="pss_end"
+
+ACTION=="change", KERNEL=="dm-[0-9]*", ENV{DM_UDEV_DISABLE_OTHER_RULES_FLAG}!="1", GOTO="do_pss"
+KERNEL=="mtdblock*", GOTO="do_pss"
+
+GOTO="pss_end"
+
+LABEL="do_pss"
+# by-path (parent device path)
+ENV{DEVTYPE}=="disk", ENV{ID_PATH}=="", DEVPATH!="*/virtual/*", IMPORT PATH_ID
+ENV{DEVTYPE}=="disk", ENV{ID_PATH}=="?*", SYMLINK+="disk/by-path/$env{ID_PATH}"
+ENV{DEVTYPE}=="partition", ENV{ID_PATH}=="?*", SYMLINK+="disk/by-path/$env{ID_PATH}-part%n"
+
+# by-label/by-uuid links (filesystem metadata)
+ENV{ID_FS_USAGE}=="filesystem|other|crypto", ENV{ID_FS_UUID_ENC}=="?*", SYMLINK+="disk/by-uuid/$env{ID_FS_UUID_ENC}"
+ENV{ID_FS_USAGE}=="filesystem|other", ENV{ID_FS_LABEL_ENC}=="?*", SYMLINK+="disk/by-label/$env{ID_FS_LABEL_ENC}"
+LABEL="pss_end"

dracut/module-setup.sh

@@ -14,6 +14,13 @@ install() {
     inst /usr/bin/chroot
     inst /usr/bin/chmod
     inst /usr/bin/sed
+
+    inst /usr/bin/memdiskfind
+    instmods mtdblock phram
+    inst_rules "$moddir/59-mtd.rules" "$moddir/61-mtd.rules"
+    prepare_udev_rules 59-mtd.rules 61-mtd.rules
+    inst_hook pre-udev 01 "$moddir/mtd.sh"
+
     inst_hook pre-pivot 01 "$moddir/adduser.sh"
     inst_hook pre-pivot 02 "$moddir/display-manager-autologin.sh"
     inst_hook pre-pivot 03 "$moddir/copy-initramfs.sh"

dracut/mtd.sh

@@ -0,0 +1,7 @@
+#!/bin/sh
+MEMDISK=$(memdiskfind)
+if [ "$MEMDISK" ]; then
+	modprobe phram phram=memdisk,$MEMDISK
+	modprobe mtdblock
+	printf 'KERNEL=="mtdblock0", RUN+="/sbin/initqueue --settled --onetime --unique /sbin/dmsquash-live-root /dev/mtdblock0"\n' >> /etc/udev/rules.d/99-live-squash.rules
+fi

mklive.sh.in

@@ -82,7 +82,7 @@ copy_void_conf() {
 
 copy_dracut_files() {
     mkdir -p $1/usr/lib/dracut/modules.d/01vmklive
-    cp dracut/*.sh $1/usr/lib/dracut/modules.d/01vmklive/
+    cp dracut/* $1/usr/lib/dracut/modules.d/01vmklive/
 }
 
 install_prereqs() {