iankelling.org Git - automated-distro-installer/blob - pxe-server

   1 #!/bin/bash
   2 # Copyright (C) 2016 Ian Kelling
   3
   4 # This program is free software; you can redistribute it and/or
   5 # modify it under the terms of the GNU General Public License
   6 # as published by the Free Software Foundation; either version 2
   7 # of the License, or (at your option) any later version.
   8
   9 # This program is distributed in the hope that it will be useful,
  10 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 # GNU General Public License for more details.
  13
  14 # You should have received a copy of the GNU General Public License
  15 # along with this program; if not, write to the Free Software
  16 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  17
  18 # Setup dhcp server to point to tftp server,
  19 # and depending on the type, setup the tftp server.
  20
  21 # usage: $0 TYPE
  22 # default distro is the base debian/fedora type. others are fai & arch.
  23 # for no pxe server, use a no-op like : or true.
  24
  25 set -eE -o pipefail
  26 trap 'echo "$0:$LINENO:error: \"$BASH_COMMAND\" returned $?" >&2' ERR
  27
  28
  29 usage() {
  30     cat <<EOF
  31 Usage: ${0##*/} [OPTIONS] TYPE [HOST]
  32 One line description
  33
  34 TYPE is one of arch, plain, fai, or : for no pxe server.
  35 HOST makes the pxe server only for that specific host
  36
  37 -h|--help  Print help and exit
  38 --         Subsequent arguments are never treated as options
  39 -p         Persist. Otherwise, wait for dhcp acks then remove.
  40 -r         Don't redeploy fai config.
  41 -a         Wait for 2 dhcp acks instead of the default 3. Some distros
  42            do 2, some do 3.
  43 EOF
  44     exit $1
  45 }
  46
  47 ##### begin command line parsing ########
  48
  49 persist=false
  50 args=()
  51 redep=true
  52 acks=3
  53 while [[ $1 ]]; do
  54     case $1 in
  55         --) shift; break ;;
  56         -h|--help) usage ;;
  57         -r) redep=false; shift ;;
  58         -p) persist=true; shift ;;
  59         -a) acks=2; shift ;;
  60         *) args+=("$1"); shift ;;
  61     esac
  62 done
  63 args+=("$@")
  64
  65
  66 read type host <<<"${args[@]}"
  67
  68 if [[ ! $type ]]; then
  69     echo "$0: error: exptected 1 argument of type"
  70     usage 1
  71 fi
  72
  73 if [[ $host ]]; then
  74     host_tag="tag:$host,"
  75 fi
  76
  77 case $type in
  78     :|true) persist=true ;;
  79     arch) acks=2 ;;
  80 esac
  81
  82 ##### end command line parsing ########
  83
  84 sv() {
  85     echo "$@"
  86     "$@"
  87 }
  88
  89 arch() {
  90     cat <<EOF
  91 dhcp-option-force=209,boot/syslinux/archiso.cfg
  92 dhcp-option-force=210,/arch/
  93 dhcp-boot=${host_tag}/arch/boot/syslinux/lpxelinux.0
  94 EOF
  95 }
  96
  97 plain() {
  98     # if arch was used before, this additionally needs
  99     # the tftp link in /mnt/usb to be changed.
 100     cat <<EOF
 101 dhcp-boot=${host_tag}pxelinux.0
 102 EOF
 103 }
 104
 105 fai() {
 106     cat <<EOF
 107 $set_host_tag
 108 dhcp-boot=${host_tag}fai/pxelinux.0,faiserver.lan,faiserver.lan
 109 EOF
 110 }
 111
 112 ack-wait() {
 113     wait_count=$1
 114     if [[ $host ]]; then
 115         host_regex=" $host"
 116     fi
 117     regex=".*DHCPACK.*$host_regex$"
 118     i=0
 119     tmp=$(mktemp)
 120     while (( i != wait_count )) && read line; do
 121         if [[ $line =~ $regex ]]; then
 122             i=$((i+1))
 123             echo $line
 124         fi
 125     done < <(ssh wrt logread -f)
 126     sv sleep 5
 127 }
 128
 129 set-pxe() {
 130     ${1:-$type} | ssh wrt "cedit pxe-server /etc/dnsmasq.conf || /etc/init.d/dnsmasq restart
 131 if [[ $type == arch ]]; then arch-pxe-mount; fi"
 132 }
 133
 134 set-pxe
 135
 136 if [[ $type == fai ]]; then
 137     if $redep; then
 138         fai-redep
 139     fi
 140     faiserver-enable
 141 fi
 142
 143 if ! $persist; then
 144     # fai's debian jessie 8.5ish does 2 dhcp requests when booting,
 145     # roughly 4 seconds apart. Earlier
 146     # versions did just 1. Now testing on a vm, it does 1.
 147     # bleh.
 148     echo "waiting for $acks dhcp acks then disabling pxe"
 149     ack-wait $acks
 150     set-pxe :
 151     if [[ $type == fai ]]; then
 152         # fai server can contain sensitive info, so turn it off
 153         # when it's not in use.
 154         echo "waiting for 1 dhcp ack then disabling fai server"
 155         ack-wait 1
 156         faiserver-disable
 157     fi
 158 fi