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
  19
  20 x="$(readlink -f "$BASH_SOURCE")"; source "${x%/*}/bash-trace"
  21
  22
  23 usage() {
  24     cat <<EOF
  25 Usage: ${0##*/} [OPTIONS] [HOST TYPE]
  26 Configure dnsmasq boot options and fai-chboot if appropriate.
  27
  28 Without HOST TYPE, disable  server and fai server.
  29
  30 HOST       A hostname known to the dhcp server, or default for all.
  31 TYPE       One of arch, plain, fai.
  32
  33 -d         Don't alter dhcp config. Only make sense for fai type, and on network
  34            other than home network.
  35 -r         Don't redeploy fai config. For example, if there is a different host
  36            that is mid-install.
  37
  38 -a         Don't setup pxe, just Wait for 2 dhcp acks, then disable the pxe
  39            server after a delay.  First ack is for pxe boot, 2nd ack is
  40            for os boot. Sometimes on debian, there is a 3rd one shortly
  41            after the 2nd. I can't remember exactly why this caused a
  42            problem, but I'm hoping the sleep will take care of it.
  43 -S         sets FAI_ACTION=sysinfo, see myfai-chboot for more info.
  44 -k         Pass -k to myfai-chboot.
  45 -w         Setup pxe, then wait like -a.
  46 -h|--help  Print help and exit
  47
  48
  49 Note, when switching between plain and arch, you will need to
  50 do something like:
  51 ssh wrt
  52 cd /mnt/usb
  53 rm tftpboot
  54 ln -s <arch/debian iso dir> tftpboot
  55
  56
  57 Note: Uses GNU getopt options parsing style
  58 EOF
  59     exit $1
  60 }
  61
  62 ##### begin command line parsing ########
  63
  64 dhcp=true
  65 redep=true
  66 acks=2
  67 wait=false
  68 chboot_args=()
  69 temp=$(getopt -l help adrSkwh "$@") || usage 1
  70 eval set -- "$temp"
  71 while true; do
  72     case $1 in
  73         -a) wait=true; set=false; shift ;;
  74         -d) dhcp=false; shift ;;
  75         -r) redep=false; shift ;;
  76         -S) chboot_args+=(-S); shift ;;
  77         -k) chboot_args+=(-k); shift ;;
  78         -w) wait=true; set=true; shift ;;
  79         -h|--help) usage ;;
  80         --) shift; break ;;
  81         *) echo "$0: Internal error!" ; exit 1 ;;
  82     esac
  83 done
  84
  85 read -r host type <<<"$@"
  86
  87 case $# in
  88     0|2);;
  89     *)
  90         echo "$0: error: expected 0 or 2 arguments"
  91         echo
  92         usage 1
  93         ;;
  94 esac
  95
  96 if $wait && ! $dhcp; then
  97     echo "$0: error -w conflicts with -d, choose one or other"
  98     exit 1
  99 fi
 100
 101
 102 if [[ $host && $host != default ]]; then
 103     host_tag="tag:$host,"
 104 fi
 105
 106 ##### end command line parsing ########
 107
 108 e() {
 109     echo "$@"
 110     "$@"
 111 }
 112
 113 arch() {
 114     cat <<EOF
 115 dhcp-option-force=209,boot/syslinux/archiso.cfg
 116 dhcp-option-force=210,/arch/
 117 dhcp-boot=${host_tag}/arch/boot/syslinux/lpxelinux.0
 118 EOF
 119 }
 120
 121 plain() {
 122     # if arch was used before, this additionally needs
 123     # the tftp link in /mnt/usb to be changed.
 124     cat <<EOF
 125 dhcp-boot=${host_tag}pxelinux.0
 126 EOF
 127 }
 128
 129 fai() {
 130     cat <<EOF
 131 dhcp-boot=${host_tag}pxelinux.0,faiserver.b8.nz,faiserver.b8.nz
 132 EOF
 133 }
 134
 135 ack-wait() {
 136     wait_count=$1
 137     if [[ $host ]]; then
 138         host_regex=" $host"
 139     fi
 140     regex=".*DHCPACK.*$host_regex$"
 141     i=0
 142     while (( i != wait_count )) && read -r line; do
 143         if [[ $line =~ $regex ]]; then
 144             i=$((i+1))
 145             echo $line
 146         fi
 147     done < <(ssh wrt logread -f)
 148     e sleep 20
 149 }
 150
 151 set-pxe() {
 152     $dhcp || return 0
 153     echo "$0: updating dnsmasq.conf:"
 154     $type
 155     ${type:-:}|ssh wrt "cedit pxe /etc/dnsmasq.conf || /etc/init.d/dnsmasq restart
 156 $([[ $type == arch ]] && echo arch-pxe-mount)"
 157 }
 158
 159
 160 if $set; then
 161     set-pxe
 162     if [[ $type == fai ]]; then
 163         e myfai-chboot ${chboot_args[@]} $host
 164         if $redep; then
 165             e fai-redep
 166         fi
 167     else
 168         # This will fail if faiserver is not setup, so ignore any
 169         # failure and don't bother us about it.
 170         myfai-chboot &>/dev/null ||:
 171     fi
 172 fi
 173
 174 if $wait; then
 175     # fai's debian jessie 8.5ish does 2 dhcp requests when booting,
 176     # roughly 4 seconds apart. Earlier
 177     # versions did just 1. Now testing on a vm, it does 1.
 178     # bleh.
 179     echo "waiting for $acks dhcp acks then disabling pxe"
 180     ack-wait $acks
 181     type=
 182     set-pxe
 183
 184     # previously tried waiting for one more ack then disabling faiserver,
 185     # since it can contain sensitive info, so turn it off when not in use,
 186     # but disabling that for now as it's inconvenient to clean this
 187     # up and run it in the background etc.
 188
 189     # if [[ $type == fai ]]; then
 190     #     echo "waiting for 1 dhcp ack then disabling fai server"
 191     #     ack-wait 1
 192     #     faiserver-disable
 193     # fi
 194 fi