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 -r         Don't redeploy fai config.
  38 -a         Wait for 2 dhcp acks, then disable the pxe server after a delay.
  39            First ack is for pxe boot, 2nd ack is for os boot. Sometimes
  40            on debian, there is a 3rd one shortly after the 2nd. I can't remember
  41            exactly why this caused a problem, but I'm hoping the sleep
  42            will take care of it.
  43 -w         Initially setup pxe, then wait like -a.
  44 -h|--help  Print help and exit
  45
  46
  47 Note: Uses GNU getopt options parsing style
  48 EOF
  49     exit $1
  50 }
  51
  52 ##### begin command line parsing ########
  53
  54 args=()
  55 redep=true
  56 acks=2
  57 wait=false
  58 temp=$(getopt -l help harw "$@") || usage 1
  59 eval set -- "$temp"
  60 while true; do
  61     case $1 in
  62         -a) wait=true; set=false; shift ;;
  63         -r) redep=false; shift ;;
  64         -w) wait=true; set=true; shift ;;
  65         -h|--help) usage ;;
  66         --) shift; break ;;
  67         *) echo "$0: Internal error!" ; exit 1 ;;
  68     esac
  69 done
  70
  71 read type host <<<"$@"
  72
  73 if [[ ! $type ]]; then
  74     echo "$0: error: exptected 1 argument of type"
  75     usage 1
  76 fi
  77
  78 if [[ $host ]]; then
  79     host_tag="tag:$host,"
  80 fi
  81
  82 ##### end command line parsing ########
  83
  84 e() {
  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     e sleep 20
 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
 135 if $set; then
 136     set-pxe
 137
 138     if [[ $type == fai ]]; then
 139         if $redep; then
 140             fai-redep
 141         fi
 142         faiserver-enable
 143     fi
 144 fi
 145
 146 if $wait; then
 147     # fai's debian jessie 8.5ish does 2 dhcp requests when booting,
 148     # roughly 4 seconds apart. Earlier
 149     # versions did just 1. Now testing on a vm, it does 1.
 150     # bleh.
 151     echo "waiting for $acks dhcp acks then disabling pxe"
 152     ack-wait $acks
 153     set-pxe :
 154
 155     # previously tried waiting for one more ack then disabling faiserver,
 156     # since it can contain sensitive info, so turn it off when not in use,
 157     # but disabling that for now as it's inconvenient to clean this
 158     # up and run it in the background etc.
 159
 160     # if [[ $type == fai ]]; then
 161     #     echo "waiting for 1 dhcp ack then disabling fai server"
 162     #     ack-wait 1
 163     #     faiserver-disable
 164     # fi
 165 fi