Add an overlay/arch/archiso-pxe-server script

The purpose of this script is to setup a basic PXE server enviroment
from Arch Linux live-media. Only need to setup an ip address in the
machine and launch it. Booting all machines conected to the network
via PXE will boot Arch Linux Live media :)

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

configs/syslinux-iso/overlay/arch/archiso-pxe-server

@@ -0,0 +1,88 @@
+#!/bin/bash
+
+# A basic script to setup a PXE server enviroment for Arch Linux live-media.
+# Contributed by Gerardo Exequiel Pozzi <vmlinuz386@yahoo.com.ar>
+
+# usage example: archiso-pxe-server [ip] [bootdevice]
+
+BOOT=/bootmnt/boot
+TFTPBOOT=/var/tftpboot
+
+IP="$1"
+ISO="$2"
+
+IP_ETH0=`ifconfig eth0 | awk -F":| +" '/inet addr/{print $4}'`
+if grep archisolabel /proc/cmdline > /dev/null; then
+    LABEL=`sed "s/.\+archisolabel=\([^ ]\+\).\+/\1/" /proc/cmdline`
+else
+    LABEL=""
+fi
+
+usage()
+{
+    echo
+    echo "archiso-pxe-server [ip] [bootdevice]"
+    echo
+    echo " options:"
+    echo "    [ip] ip address of the local interface to serve (default use ip of eth0)"
+    echo "    [bootdevice] boot device of Arch Linux Live media (for example /dev/cdrom)"
+    echo
+}
+
+copy_files()
+{
+    if [ ! -d $TFTPBOOT ]; then
+        mkdir -p $TFTPBOOT/boot
+        mkdir -p $TFTPBOOT/pxelinux.cfg
+        cp $BOOT/vmlinuz26 $TFTPBOOT/boot
+        cp $BOOT/archiso.img $TFTPBOOT/boot
+        cp $BOOT/memtest $TFTPBOOT/boot
+        cp $BOOT/x86test $TFTPBOOT/boot
+        cp $BOOT/splash.png $TFTPBOOT/boot
+        cp $BOOT/isolinux/pxelinux.0 $TFTPBOOT
+        cp $BOOT/isolinux/chain.c32 $TFTPBOOT
+        cp $BOOT/isolinux/reboot.c32 $TFTPBOOT
+        cp $BOOT/isolinux/vesamenu.c32 $TFTPBOOT
+        sed 's|IPAPPEND 0|IPAPPEND 1|g' \
+            $BOOT/isolinux/isolinux.cfg > \
+            $TFTPBOOT/pxelinux.cfg/default
+    fi
+}
+
+start_pxe_server()
+{
+    dnsmasq \
+        --enable-tftp \
+        --tftp-root=$TFTPBOOT \
+        --dhcp-boot=/pxelinux.0,"${IP}" \
+        --dhcp-range=${IP%.*}.2,${IP%.*}.254,86400
+}
+
+start_nbd_server()
+{
+    nbd-server 9040 ${ISO} -r
+}
+
+check_parameters()
+{
+    if [ -z "$IP_ETH0" -a -z "$IP" ]; then
+        echo "ERROR: missing IP address"
+        usage
+        exit 1
+    else
+        IP=$IP_ETH0
+    fi
+
+    if [ -z "$LABEL" -a -z "$ISO" ]; then
+        echo "ERROR: can't determine boot device, please specify on command line"
+        usage
+        exit 1
+    else
+        ISO="/dev/disk/by-label/$LABEL"
+    fi
+}
+
+check_parameters
+copy_files
+start_pxe_server
+start_nbd_server