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 -h|--help  Print help and exit
  44
  45
  46 Note: Uses GNU getopt options parsing style
  47 EOF
  48     exit $1
  49 }
  50
  51 ##### begin command line parsing ########
  52
  53 args=()
  54 redep=true
  55 acks=2
  56 wait=false
  57 temp=$(getopt -l help hra "$@") || usage 1
  58 eval set -- "$temp"
  59 while true; do
  60     case $1 in
  61         -h|--help) usage ;;
  62         -r) redep=false; shift ;;
  63         -a) wait=true; shift ;;
  64         --) shift; break ;;
  65         *) echo "$0: Internal error!" ; exit 1 ;;
  66     esac
  67 done
  68
  69 read type host <<<"$@"
  70
  71 if [[ ! $type ]]; then
  72     echo "$0: error: exptected 1 argument of type"
  73     usage 1
  74 fi
  75
  76 if [[ $host ]]; then
  77     host_tag="tag:$host,"
  78 fi
  79
  80 ##### end command line parsing ########
  81
  82 e() {
  83     echo "$@"
  84     "$@"
  85 }
  86
  87 arch() {
  88     cat <<EOF
  89 dhcp-option-force=209,boot/syslinux/archiso.cfg
  90 dhcp-option-force=210,/arch/
  91 dhcp-boot=${host_tag}/arch/boot/syslinux/lpxelinux.0
  92 EOF
  93 }
  94
  95 plain() {
  96     # if arch was used before, this additionally needs
  97     # the tftp link in /mnt/usb to be changed.
  98     cat <<EOF
  99 dhcp-boot=${host_tag}pxelinux.0
 100 EOF
 101 }
 102
 103 fai() {
 104     cat <<EOF
 105 $set_host_tag
 106 dhcp-boot=${host_tag}fai/pxelinux.0,faiserver.lan,faiserver.lan
 107 EOF
 108 }
 109
 110 ack-wait() {
 111     wait_count=$1
 112     if [[ $host ]]; then
 113         host_regex=" $host"
 114     fi
 115     regex=".*DHCPACK.*$host_regex$"
 116     i=0
 117     tmp=$(mktemp)
 118     while (( i != wait_count )) && read line; do
 119         if [[ $line =~ $regex ]]; then
 120             i=$((i+1))
 121             echo $line
 122         fi
 123     done < <(ssh wrt logread -f)
 124     e sleep 20
 125 }
 126
 127 set-pxe() {
 128     ${1:-$type} | ssh wrt "cedit pxe-server /etc/dnsmasq.conf || /etc/init.d/dnsmasq restart
 129 if [[ $type == arch ]]; then arch-pxe-mount; fi"
 130 }
 131
 132 if ! $wait && [[ $type != : ]]; then
 133     set-pxe
 134
 135     if [[ $type == fai ]]; then
 136         if $redep; then
 137             fai-redep
 138         fi
 139         faiserver-enable
 140     fi
 141 fi
 142
 143 if $wait; 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
 152     # previously tried waiting for one more ack then disabling faiserver,
 153     # since it can contain sensitive info, so turn it off when not in use,
 154     # but disabling that for now as it's inconvenient to clean this
 155     # up and run it in the background etc.
 156
 157     # if [[ $type == fai ]]; then
 158     #     echo "waiting for 1 dhcp ack then disabling fai server"
 159     #     ack-wait 1
 160     #     faiserver-disable
 161     # fi
 162 fi