setup.sh

   1 #!/bin/sh
   2
   3 # https://stackoverflow.com/questions/2990414/echo-that-outputs-to-stderr
   4 errcho(){ >&2 echo "$@"; }
   5
   6 # run this script as root, once, at installation
   7 if id -u 0tdns > /dev/null 2>&1; then
   8     errcho "User 0tdns already exists."
   9     errcho "Do you have Zero Trust DNS already set up?"
  10     errcho "If so, you need to uninstall it properly"
  11     errcho "(e.g. via provided uninstall.sh script)"
  12     errcho "before setting it up again"
  13     exit 1
  14 fi
  15
  16 if [ `id -u` != 0 ]; then
  17     errcho "This script needs to be run as root"
  18     exit 1
  19 fi
  20
  21 # part of the program running inside network namespace
  22 # will run under this user
  23 useradd --system 0tdns
  24
  25 # crontab automatically adds a 'DO NOT EDIT' header to
  26 # crontab file; if we don't remove it every time - headers
  27 # will accumulate :/ (not on Debian, though)
  28 # line we want to add to crontab is in 0tdns_crontab file
  29 crontab -l 2> /dev/null |
  30     grep -vE '^# DO NOT EDIT THIS FILE|^# \(- installed on .*\)|^# \(Cron version .*\)' |
  31     cat - 0tdns_crontab | crontab