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. This is
  27 not general purpose, it has code specific to dhcp servers I run.
  28
  29 Without TYPE, disable  server and fai server. In that case, HOST is only
  30 needed for fsf office network.
  31
  32 HOST       A hostname known to the dhcp server, or default for all.
  33 TYPE       One of arch, parabola, plain, fai.
  34
  35 -a         Don't setup pxe, just Wait for 2 dhcp acks, then disable the pxe
  36            server after a delay.  First ack is for pxe boot, 2nd ack is
  37            for os boot. Sometimes on debian, there is a 3rd one shortly
  38            after the 2nd. I can't remember exactly why this caused a
  39            problem, but I'm hoping the sleep will take care of it.
  40 -d         Don't alter dhcp config. Only make sense for fai type, and on network
  41            other than home or fsf.
  42 -k         Pass -k to myfai-chboot.
  43 -r         Don't redeploy fai config. For example, if there is a different host
  44            that is mid-install.
  45
  46 -S         sets FAI_ACTION=sysinfo, see myfai-chboot for more info.
  47 -w         Setup pxe, then wait like -a.
  48 -h|--help  Print help and exit
  49
  50
  51 Note, when switching between plain and arch or parabola, you will need to
  52 do something like:
  53 ssh wrt
  54 cd /mnt/usb
  55 rm tftpboot
  56 ln -s <arch/parabola/debian iso dir> tftpboot
  57
  58
  59 Note: Uses GNU getopt options parsing style
  60 EOF
  61   exit $1
  62 }
  63
  64 ##### begin command line parsing ########
  65
  66 dhcp=true
  67 redep=true
  68 acks=2
  69 wait=false
  70 fsf=false
  71
  72 case $HOSTNAME in
  73   x2|x3|kw) fsf=true ;;
  74 esac
  75
  76 chboot_args=()
  77 temp=$(getopt -l help adkrSwh "$@") || usage 1
  78 eval set -- "$temp"
  79 while true; do
  80   case $1 in
  81     -a) wait=true; set=false; shift ;;
  82     -d) dhcp=false; shift ;;
  83     -k) chboot_args+=(-k); shift ;;
  84     -r) redep=false; shift ;;
  85     -S) chboot_args+=(-S); shift ;;
  86     -w) wait=true; set=true; shift ;;
  87     -h|--help) usage ;;
  88     --) shift; break ;;
  89     *) echo "$0: Internal error!" ; exit 1 ;;
  90   esac
  91 done
  92
  93 read -r host type <<<"$@"
  94
  95 case $# in
  96   [01]);;
  97   2)
  98     case $type in
  99       arch|parabola) cmd=archlike ;;
 100       fai) cmd=fai ;;
 101       *)
 102         echo "$0: error expected type of arch|parabola|fai"
 103         echo
 104         usage 1
 105         ;;
 106     esac
 107     ;;
 108   *)
 109     echo "$0: error: expected 0-2 arguments"
 110     echo
 111     usage 1
 112     ;;
 113 esac
 114
 115
 116 if $wait && ! $dhcp; then
 117   echo "$0: error -w conflicts with -d, choose one or other"
 118   exit 1
 119 fi
 120
 121
 122 if [[ $host && $host != default ]]; then
 123   host_tag="tag:$host,"
 124 fi
 125
 126 ##### end command line parsing ########
 127
 128 e() {
 129   echo "$@"
 130   "$@"
 131 }
 132
 133 archlike() {
 134   cat <<EOF
 135 dhcp-option-force=209,boot/syslinux/${type}iso.cfg
 136 dhcp-option-force=210,/${type}/
 137 dhcp-boot=${host_tag}/${type}/boot/syslinux/lpxelinux.0
 138 EOF
 139 }
 140
 141 plain() {
 142   # if arch based was used before, this additionally needs
 143   # the tftp link in /mnt/usb to be changed.
 144   cat <<EOF
 145 dhcp-boot=${host_tag}pxelinux.0
 146 EOF
 147 }
 148
 149 fai() {
 150   cat <<EOF
 151 dhcp-boot=${host_tag}pxelinux.0,faiserver.b8.nz,faiserver.b8.nz
 152 EOF
 153 }
 154
 155 ack-wait() {
 156   if $fsf; then
 157     wait_cmd="ssh tarantula tail -n0 -f /var/log/syslog"
 158   else
 159     wait_cmd="ssh wrt logread -f"
 160   fi
 161   wait_count=$1
 162   if [[ $host ]]; then
 163     if $fsf; then
 164       host_regex=" $(getent hosts kw | awk '{print $1}' | sed 's/\./\\./g')"
 165       else
 166     host_regex=" $host"
 167     fi
 168   fi
 169   regex=".*DHCPACK.*$host_regex\b"
 170   i=0
 171   while (( i != wait_count )) && read -r line; do
 172     if [[ $line =~ $regex ]]; then
 173       i=$((i+1))
 174       echo $line
 175     fi
 176   done < <($wait_cmd ||:) # tail returns 2 it seems
 177   e sleep 20
 178 }
 179
 180 set-pxe() {
 181   $dhcp || return 0
 182   if $fsf; then
 183     if [[ ! $cmd ]]; then
 184       echo "$0: removing pxe for $host on tarantula"
 185       ssh tarantula bash -e <<EOF
 186 sed -ri 's/^( *host +$host *\{).*/\1/' /etc/dhcp3/dhcpd.conf
 187 /etc/init.d/dhcp3-server restart
 188 EOF
 189     elif [[ $cmd == fai ]]; then
 190       echo "$0: adding pxe for $host on tarantula"
 191       ssh tarantula bash -e <<EOF
 192 sed -ri 's/^( *host +$host *\{).*/\1 next-server faiserver.office.fsf.org; filename "pxelinux.0";/' /etc/dhcp3/dhcpd.conf
 193 /etc/init.d/dhcp3-server restart
 194 EOF
 195     fi
 196   else
 197     echo "$0: updating dnsmasq.conf:"
 198     $cmd
 199     ${cmd:-:}|ssh wrt "cedit pxe /etc/dnsmasq.conf || /etc/init.d/dnsmasq restart
 200 $([[ $type == arch || $type == parabola ]] && echo archlike-pxe-mount)"
 201   fi
 202 }
 203
 204
 205 if $set; then
 206   set-pxe
 207   if [[ $type == fai ]]; then
 208     e myfai-chboot ${chboot_args[@]} $host
 209     if $redep; then
 210       e fai-redep
 211     fi
 212   else
 213     # This will fail if faiserver is not setup, so ignore any
 214     # failure and don't bother us about it.
 215     myfai-chboot &>/dev/null ||:
 216   fi
 217 fi
 218
 219 if $wait; then
 220   # fai's debian jessie 8.5ish does 2 dhcp requests when booting,
 221   # roughly 4 seconds apart. Earlier
 222   # versions did just 1. Now testing on a vm, it does 1.
 223   # bleh.
 224   echo "waiting for $acks dhcp acks then disabling pxe"
 225   ack-wait $acks
 226   type=
 227   unset cmd
 228   set-pxe
 229
 230   # previously tried waiting for one more ack then disabling faiserver,
 231   # since it can contain sensitive info, so turn it off when not in use,
 232   # but disabling that for now as it's inconvenient to clean this
 233   # up and run it in the background etc.
 234
 235   # if [[ $type == fai ]]; then
 236   #     echo "waiting for 1 dhcp ack then disabling fai server"
 237   #     ack-wait 1
 238   #     faiserver-disable
 239   # fi
 240 fi