iankelling.org Git - distro-setup/blob - switch-mail-host

   1 #!/bin/bash
   2 set -x
   3 set -eE -o pipefail
   4 trap 'echo "$0:$LINENO:error: \"$BASH_COMMAND\" returned $?" >&2' ERR
   5
   6 usage() {
   7   cat <<EOF
   8 Usage: ${0##*/} OLD_HOST NEW_HOST
   9
  10 Adjust home network dns so NEW_HOST resolves locally if it is on the
  11 local network.  Turn off mail receiving on OLD_HOST, run btrbk to move
  12 mail to NEW_HOST, turn on mail receiving on NEW_HOST.
  13
  14 -w         Don't try to ssh to wrt. Should only be used in unusual network situation.
  15 -h|--help  Print help and exit.
  16
  17 Note: Uses GNU getopt options parsing style
  18 EOF
  19   exit $1
  20 }
  21
  22 ##### begin command line parsing ########
  23
  24 update_wrt=true # default
  25 temp=$(getopt -l help wh "$@") || usage 1
  26 eval set -- "$temp"
  27 while true; do
  28   case $1 in
  29     -w) update_wrt=false; shift ;;
  30     -h|--help) usage ;;
  31     --) shift; break ;;
  32     *) echo "$0: Internal error! unexpected args: $*" ; exit 1 ;;
  33   esac
  34 done
  35
  36
  37 (( $# == 2 )) || usage 1
  38
  39 old_host=$1
  40 new_host=$2
  41 source /a/bin/bash_unpublished/source-semi-priv
  42
  43 if [[ $old_host != $MAIL_HOST ]]; then
  44   read -p "warning: \$old_host != \$MAIL_HOST: $old_host != $MAIL_HOST, proceed? y/N "
  45   if [[ $REPLY != [yY] ]]; then
  46     exit 1
  47   fi
  48 fi
  49
  50 if [[ $new_host == "$HOSTNAME" ]]; then
  51   localhost_new=true
  52   new_shell=
  53 else
  54   localhost_new=false
  55   new_shell="ssh $new_host"
  56 fi
  57
  58 old_shell="ssh $old_host"
  59 if [[ $old_host == "$HOSTNAME" ]]; then
  60   old_shell=
  61 fi
  62
  63 if [[ ! $new_host || ! $old_host ]]; then
  64   echo "$0: bad args. see script"
  65   exit 1
  66 fi
  67
  68 at_home=false
  69 if timeout -s 9 5 ssh-keyscan -p 2220 -t rsa 10.0.0.1 2>/dev/null | grep -qFx '[10.0.0.1]:2220 ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQCH+/h1dGEfKEusBblndU2e6QT4wLCm5+yqr/sqh/0X9YfjR7BfWWm8nNmuP55cYc+Wuf5ljB1H1acXEcsl1y8e0j3agHfF0V74FE1N1zz5nn2Ep8NHnmqgEhza38ZxMPh+4p3X7zklEKU7+3SzybKBi8sg0wLzlS2LM0JaUN80zR2sK11Kye3dURUXPk78u5wodOkgcEYRwSYaDMJlUzWP+poRXIDJwFaMQnwmxbl/c84yOyaU0x/d6hFwoRscWecihX+vvBNeSyxR4xr2HDOyUWwJkctyAgt2p7w3tfkXOKcCRzTAjGVIMQLTvo0sG/yJbcyHoEFdFybCsgDvfyYn'; then
  70   at_home=true
  71 fi
  72 echo "$0: at_home = $at_home"
  73
  74 source /a/bin/bash_unpublished/source-semi-priv
  75 #### begin convert private hostnames to public hostnames ####
  76 #if ! $at_home; then
  77 #    for var in old_host new_host; do
  78 #        case ${!var} in
  79 #            tp)
  80 #                eval $var=$HOME_DOMAIN
  81 #                ;;
  82 #        esac
  83 #    done
  84 #fi
  85 ####  end convert private hostnames to public hostnames ####
  86
  87
  88 # because our port forward is not robust enough, we can't use proxy command,
  89 # todo: setup vpn so this is all taken care of.
  90 if ! $update_wrt; then
  91   wrt_shell=:
  92 else
  93   wrt_shell="ssh wrt.b8.nz"
  94 fi
  95
  96 btrbk_test="systemctl is-active btrbk.service"
  97 while $new_shell $btrbk_test || $old_shell $btrbk_test; do
  98   echo "$0: btrbk is running on new or old host. sleeping for 8 seconds"
  99   sleep 6
 100   echo "$0: testing for btrbk activity in 2 seconds"
 101   sleep 2
 102 done
 103
 104 new_hostname=$($new_shell hostname)
 105
 106 ########### end initial processing, begin actually modifying things ##########
 107
 108 restore_new_btrbk=false
 109 if $new_shell systemctl is-active btrbk.timer; then
 110   $new_shell sudo systemctl stop btrbk.timer
 111   restore_new_btrbk=true
 112 fi
 113 restore_old_btrbk=false
 114 if $old_shell systemctl is-active btrbk.timer; then
 115   $old_shell sudo systemctl stop btrbk.timer
 116   restore_old_btrbk=true
 117 fi
 118
 119
 120 $new_shell bash -xs <<'EOF'
 121 set -eE
 122 if mountpoint -q /m; then sudo umount /m; fi
 123 if mountpoint -q /o; then sudo umount /o; fi
 124 EOF
 125
 126 # previously, I was checking to see if the new mail host
 127 # is on my home network, then changing my home dns
 128 # to resolve on the local network, so that I didnt
 129 # have to send traffic out to the internet or rely
 130 # on that. However, that breaks for a laptop that roams.
 131 # So, we could have a cronjob that updates that dns,
 132 # however, another solution is to just use ipv6,
 133 # and I prefer that.
 134 #
 135 # TODO: enable ipv6 for email. exim config setting disables it.
 136 # need to add vpn support. need to add firewall / routing.
 137 # I think exim will try ipv6 first, so no need to disable
 138 # ipv6 i think.
 139
 140 $old_shell primary-setup $new_hostname
 141
 142 /a/bin/distro-setup/install-my-scripts
 143
 144 if $localhost_new; then
 145   btrbk-run -s $old_host -m /o
 146 else
 147   btrbk-run -t $new_host -m /o
 148 fi
 149
 150 $new_shell primary-setup $new_hostname
 151
 152 if $restore_new_btrbk; then
 153   $new_shell sudo systemctl start btrbk.timer
 154 fi
 155 if $restore_old_btrbk; then
 156   $old_shell sudo systemctl start btrbk.timer
 157 fi