[syslinux-iso] Add PXE support via NBD.

nbd (network block device utilities) package is required.
This package is in AUR at this moment.
http://aur.archlinux.org/packages.php?ID=9691

Also added dnsmasq pkg, so the live-medium, appart of support booting from PXE
also add the capability to acts as server for PXE & NBD.

This is a dirty script to ilustrate how to launch server:

---- Cut here ----

IP=$1
ISO=$2

ifconfig eth0 ${IP}
dnsmasq \
  --enable-tftp \
  --tftp-root=/bootmnt/boot \
  --dhcp-boot=/pxelinux.0,"${IP}" \
  --dhcp-range=${IP%.*}.2,${IP%.*}.254,86400
nbd-server 9040 ${ISO} -r
---- Cut here ----

Signed-off-by: Gerardo Exequiel Pozzi <vmlinuz386@yahoo.com.ar>

configs/syslinux-iso/Makefile

@@ -43,6 +43,8 @@ bootfiles: root-image
 	cp $(WORKDIR)/root-image/usr/lib/syslinux/*.c32 $(WORKDIR)/iso/boot/isolinux/
 	cp $(WORKDIR)/root-image/usr/lib/syslinux/isolinux.bin $(WORKDIR)/iso/boot/isolinux/
 	cp $(WORKDIR)/root-image/usr/lib/syslinux/memdisk $(WORKDIR)/iso/boot/isolinux/
+	cp $(WORKDIR)/root-image/usr/lib/syslinux/pxelinux.0 $(WORKDIR)/iso/boot/
+	sed -i "s|XXX|$(LABEL)|g" $(WORKDIR)/iso/boot/pxelinux.cfg/default
 
 
 # Rules for initcpio images

configs/syslinux-iso/boot-files/pxelinux.cfg/default

@@ -0,0 +1,7 @@
+PROMPT 1
+DEFAULT arch
+
+LABEL arch
+KERNEL vmlinuz26
+APPEND initrd=archiso.img archisolabel=XXX
+IPAPPEND 1

configs/syslinux-iso/mkinitcpio.conf

@@ -2,5 +2,5 @@
 MODULES=""
 BINARIES=""
 FILES=""
-HOOKS="base udev archiso pata scsi sata usb fw pcmcia filesystems usbinput"
+HOOKS="base udev nbd archiso pata scsi sata usb fw pcmcia filesystems usbinput"
 COMPRESSION="lzma"

configs/syslinux-iso/packages.i686

@@ -5,6 +5,7 @@ b43-fwcutter
 base
 ddrescue
 dmraid
+dnsmasq
 dnsutils
 dosfstools
 elinks
@@ -20,6 +21,7 @@ joe
 lftp
 lilo
 memtest86+
+nbd
 ndiswrapper
 ndiswrapper-utils
 nfs-utils

configs/syslinux-iso/packages.x86_64

@@ -5,6 +5,7 @@ b43-fwcutter
 base
 ddrescue
 dmraid
+dnsmasq
 dnsutils
 dosfstools
 elinks
@@ -20,6 +21,7 @@ joe
 lftp
 lilo
 memtest86+
+nbd
 ndiswrapper
 ndiswrapper-utils
 nfs-utils