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] [HOST TYPE]
  32 One line description
  33
  34 TYPE is one of arch, plain, fai.
  35 HOST is a hostname known to the dhcp server, or default for all, or none to disable
  36
  37 -r         Don't redeploy fai config. For example, if there is a different host
  38            that is mid-install.
  39 -a         Wait for 2 dhcp acks, then disable the pxe server after a delay.
  40            First ack is for pxe boot, 2nd ack is for os boot. Sometimes
  41            on debian, there is a 3rd one shortly after the 2nd. I can't remember
  42            exactly why this caused a problem, but I'm hoping the sleep
  43            will take care of it.
  44 -w         Initially setup pxe, then wait like -a.
  45 -h|--help  Print help and exit
  46
  47
  48 Note: Uses GNU getopt options parsing style
  49 EOF
  50     exit $1
  51 }
  52
  53 ##### begin command line parsing ########
  54
  55 args=()
  56 redep=true
  57 acks=2
  58 wait=false
  59 temp=$(getopt -l help harw "$@") || usage 1
  60 eval set -- "$temp"
  61 while true; do
  62     case $1 in
  63         -a) wait=true; set=false; shift ;;
  64         -r) redep=false; shift ;;
  65         -w) wait=true; set=true; shift ;;
  66         -h|--help) usage ;;
  67         --) shift; break ;;
  68         *) echo "$0: Internal error!" ; exit 1 ;;
  69     esac
  70 done
  71
  72 read host type <<<"$@"
  73
  74 case $# in
  75     0|2);;
  76     *)
  77         echo "$0: error: expected 0 or 2 arguments"
  78         echo
  79         usage 1
  80         ;;
  81 esac
  82
  83 if [[ $host ]]; then
  84     host_tag="tag:$host,"
  85 fi
  86
  87 ##### end command line parsing ########
  88
  89 e() {
  90     echo "$@"
  91     "$@"
  92 }
  93
  94 arch() {
  95     cat <<EOF
  96 dhcp-option-force=209,boot/syslinux/archiso.cfg
  97 dhcp-option-force=210,/arch/
  98 dhcp-boot=${host_tag}/arch/boot/syslinux/lpxelinux.0
  99 EOF
 100 }
 101
 102 plain() {
 103     # if arch was used before, this additionally needs
 104     # the tftp link in /mnt/usb to be changed.
 105     cat <<EOF
 106 dhcp-boot=${host_tag}pxelinux.0
 107 EOF
 108 }
 109
 110 fai() {
 111     cat <<EOF
 112 $set_host_tag
 113 dhcp-boot=${host_tag}pxelinux.0,faiserver.lan,faiserver.lan
 114 EOF
 115 }
 116
 117 ack-wait() {
 118     wait_count=$1
 119     if [[ $host ]]; then
 120         host_regex=" $host"
 121     fi
 122     regex=".*DHCPACK.*$host_regex$"
 123     i=0
 124     tmp=$(mktemp)
 125     while (( i != wait_count )) && read line; do
 126         if [[ $line =~ $regex ]]; then
 127             i=$((i+1))
 128             echo $line
 129         fi
 130     done < <(ssh wrt logread -f)
 131     e sleep 20
 132 }
 133
 134 set-pxe() {
 135     ${type:-:}|ssh wrt "cedit pxe /etc/dnsmasq.conf || /etc/init.d/dnsmasq restart
 136 $([[ $type == arch ]] && echo arch-pxe-mount)"
 137 }
 138
 139
 140 if $set; then
 141     set-pxe
 142     if [[ $type == fai ]]; then
 143         e myfai-chboot $host
 144         if $redep; then
 145             e fai-redep
 146         fi
 147     else
 148         e myfai-chboot
 149     fi
 150 fi
 151
 152 if $wait; then
 153     # fai's debian jessie 8.5ish does 2 dhcp requests when booting,
 154     # roughly 4 seconds apart. Earlier
 155     # versions did just 1. Now testing on a vm, it does 1.
 156     # bleh.
 157     echo "waiting for $acks dhcp acks then disabling pxe"
 158     ack-wait $acks
 159     type=
 160     set-pxe
 161
 162     # previously tried waiting for one more ack then disabling faiserver,
 163     # since it can contain sensitive info, so turn it off when not in use,
 164     # but disabling that for now as it's inconvenient to clean this
 165     # up and run it in the background etc.
 166
 167     # if [[ $type == fai ]]; then
 168     #     echo "waiting for 1 dhcp ack then disabling fai server"
 169     #     ack-wait 1
 170     #     faiserver-disable
 171     # fi
 172 fi