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 Without HOST TYPE, disable pxe server and fai server.
  35 TYPE is one of arch, plain, fai.
  36 HOST is a hostname known to the dhcp server, or default for all
  37
  38 -r         Don't redeploy fai config. For example, if there is a different host
  39            that is mid-install.
  40 -a         Wait for 2 dhcp acks, then disable the pxe server after a delay.
  41            First ack is for pxe boot, 2nd ack is for os boot. Sometimes
  42            on debian, there is a 3rd one shortly after the 2nd. I can't remember
  43            exactly why this caused a problem, but I'm hoping the sleep
  44            will take care of it.
  45 -w         Initially setup pxe, then wait like -a.
  46 -h|--help  Print help and exit
  47
  48
  49 Note: Uses GNU getopt options parsing style
  50 EOF
  51     exit $1
  52 }
  53
  54 ##### begin command line parsing ########
  55
  56 args=()
  57 redep=true
  58 acks=2
  59 wait=false
  60 temp=$(getopt -l help harw "$@") || usage 1
  61 eval set -- "$temp"
  62 while true; do
  63     case $1 in
  64         -a) wait=true; set=false; shift ;;
  65         -r) redep=false; shift ;;
  66         -w) wait=true; set=true; shift ;;
  67         -h|--help) usage ;;
  68         --) shift; break ;;
  69         *) echo "$0: Internal error!" ; exit 1 ;;
  70     esac
  71 done
  72
  73 read host type <<<"$@"
  74
  75 case $# in
  76     0|2);;
  77     *)
  78         echo "$0: error: expected 0 or 2 arguments"
  79         echo
  80         usage 1
  81         ;;
  82 esac
  83
  84 if [[ $host ]]; then
  85     host_tag="tag:$host,"
  86 fi
  87
  88 ##### end command line parsing ########
  89
  90 e() {
  91     echo "$@"
  92     "$@"
  93 }
  94
  95 arch() {
  96     cat <<EOF
  97 dhcp-option-force=209,boot/syslinux/archiso.cfg
  98 dhcp-option-force=210,/arch/
  99 dhcp-boot=${host_tag}/arch/boot/syslinux/lpxelinux.0
 100 EOF
 101 }
 102
 103 plain() {
 104     # if arch was used before, this additionally needs
 105     # the tftp link in /mnt/usb to be changed.
 106     cat <<EOF
 107 dhcp-boot=${host_tag}pxelinux.0
 108 EOF
 109 }
 110
 111 fai() {
 112     cat <<EOF
 113 $set_host_tag
 114 dhcp-boot=${host_tag}pxelinux.0,faiserver.lan,faiserver.lan
 115 EOF
 116 }
 117
 118 ack-wait() {
 119     wait_count=$1
 120     if [[ $host ]]; then
 121         host_regex=" $host"
 122     fi
 123     regex=".*DHCPACK.*$host_regex$"
 124     i=0
 125     tmp=$(mktemp)
 126     while (( i != wait_count )) && read line; do
 127         if [[ $line =~ $regex ]]; then
 128             i=$((i+1))
 129             echo $line
 130         fi
 131     done < <(ssh wrt logread -f)
 132     e sleep 20
 133 }
 134
 135 set-pxe() {
 136     ${type:-:}|ssh wrt "cedit pxe /etc/dnsmasq.conf || /etc/init.d/dnsmasq restart
 137 $([[ $type == arch ]] && echo arch-pxe-mount)"
 138 }
 139
 140
 141 if $set; then
 142     set-pxe
 143     if [[ $type == fai ]]; then
 144         e myfai-chboot $host
 145         if $redep; then
 146             e fai-redep
 147         fi
 148     else
 149         e myfai-chboot
 150     fi
 151 fi
 152
 153 if $wait; then
 154     # fai's debian jessie 8.5ish does 2 dhcp requests when booting,
 155     # roughly 4 seconds apart. Earlier
 156     # versions did just 1. Now testing on a vm, it does 1.
 157     # bleh.
 158     echo "waiting for $acks dhcp acks then disabling pxe"
 159     ack-wait $acks
 160     type=
 161     set-pxe
 162
 163     # previously tried waiting for one more ack then disabling faiserver,
 164     # since it can contain sensitive info, so turn it off when not in use,
 165     # but disabling that for now as it's inconvenient to clean this
 166     # up and run it in the background etc.
 167
 168     # if [[ $type == fai ]]; then
 169     #     echo "waiting for 1 dhcp ack then disabling fai server"
 170     #     ack-wait 1
 171     #     faiserver-disable
 172     # fi
 173 fi