dyndns/update

   1 #!/bin/bash
   2 set -e
   3
   4 zone="$1"
   5 subdomain="$2"
   6 interval_min="$3"
   7 interval_avg="$4"
   8 interval_mem="$5"
   9
  10 now=`date +%s`
  11 charge=0
  12
  13 case $subdomain in
  14 '@')    files=_                 ;;
  15 *)      files=$subdomain        ;;
  16 esac
  17
  18 if test -f $files,timings && read lastup charge <$files,timings
  19 then
  20         if [ $now -lt $[ $lastup + $interval_min ] ]; then
  21                 echo "wait $[ $lastup + $interval_min - $now ]"
  22                 echo >&2 "must wait at least $interval_min between updates"
  23                 exit 75
  24         fi
  25         charge=$[ $charge + $interval_avg - ($now - $lastup) ]
  26         if [ $charge -gt $interval_mem ]; then
  27                 echo "wait $[ $charge - $interval_mem ]"
  28                 echo >&2 "must wait on average $interval_avg between updates"
  29                 exit 75
  30         fi
  31         if [ $charge -lt 0 ]; then charge=0; fi
  32 fi
  33
  34 sort >$files,new
  35
  36 if test -f $files,data
  37 then
  38         set +e
  39         diff >/dev/null $files,data $files,new
  40         diff=$?
  41         set -e
  42
  43         if [ $diff = 0 ]; then echo 'unchanged'; exit 0; fi
  44         if [ $diff != 1 ]; then exit 1; fi
  45 fi
  46
  47 echo $now $charge >$files,timings.new
  48 mv -f $files,timings.new $files,timings
  49 mv $files,new $files,data
  50
  51 exec /usr/local/lib/userv/dyndns/install $zone