examples/init.sh

   1 #!/bin/sh
   2 set -e
   3 ### BEGIN INIT INFO
   4 # Provides:          unicorn
   5 # Required-Start:    $local_fs $network
   6 # Required-Stop:     $local_fs $network
   7 # Default-Start:     2 3 4 5
   8 # Default-Stop:      0 1 6
   9 # Short-Description: Start/stop unicorn Rack app server
  10 ### END INIT INFO
  11
  12 # Example init script, this can be used with nginx, too,
  13 # since nginx and unicorn accept the same signals.
  14
  15 # Feel free to change any of the following variables for your app:
  16 TIMEOUT=${TIMEOUT-60}
  17 APP_ROOT=/home/x/my_app/current
  18 PID=$APP_ROOT/tmp/pids/unicorn.pid
  19 CMD="/usr/bin/unicorn -D -c $APP_ROOT/config/unicorn.rb"
  20 INIT_CONF=$APP_ROOT/config/init.conf
  21 UPGRADE_DELAY=${UPGRADE_DELAY-2}
  22 action="$1"
  23 set -u
  24
  25 test -f "$INIT_CONF" && . $INIT_CONF
  26
  27 OLD="$PID.oldbin"
  28
  29 cd $APP_ROOT || exit 1
  30
  31 sig () {
  32         test -s "$PID" && kill -$1 $(cat $PID)
  33 }
  34
  35 oldsig () {
  36         test -s "$OLD" && kill -$1 $(cat $OLD)
  37 }
  38
  39 case $action in
  40 start)
  41         sig 0 && echo >&2 "Already running" && exit 0
  42         $CMD
  43         ;;
  44 stop)
  45         sig QUIT && exit 0
  46         echo >&2 "Not running"
  47         ;;
  48 force-stop)
  49         sig TERM && exit 0
  50         echo >&2 "Not running"
  51         ;;
  52 restart|reload)
  53         sig HUP && echo reloaded OK && exit 0
  54         echo >&2 "Couldn't reload, starting '$CMD' instead"
  55         $CMD
  56         ;;
  57 upgrade)
  58         if oldsig 0
  59         then
  60                 echo >&2 "Old upgraded process still running with $OLD"
  61                 exit 1
  62         fi
  63
  64         cur_pid=
  65         if test -s "$PID"
  66         then
  67                 cur_pid=$(cat $PID)
  68         fi
  69
  70         if test -n "$cur_pid" &&
  71                         kill -USR2 "$cur_pid" &&
  72                         sleep $UPGRADE_DELAY &&
  73                         new_pid=$(cat $PID) &&
  74                         test x"$new_pid" != x"$cur_pid" &&
  75                         kill -0 "$new_pid" &&
  76                         kill -QUIT "$cur_pid"
  77         then
  78                 n=$TIMEOUT
  79                 while kill -0 "$cur_pid" 2>/dev/null && test $n -ge 0
  80                 do
  81                         printf '.' && sleep 1 && n=$(( $n - 1 ))
  82                 done
  83                 echo
  84
  85                 if test $n -lt 0 && kill -0 "$cur_pid" 2>/dev/null
  86                 then
  87                         echo >&2 "$cur_pid still running after $TIMEOUT seconds"
  88                         exit 1
  89                 fi
  90                 exit 0
  91         fi
  92         echo >&2 "Couldn't upgrade, starting '$CMD' instead"
  93         $CMD
  94         ;;
  95 reopen-logs)
  96         sig USR1
  97         ;;
  98 *)
  99         echo >&2 "Usage: $0 <start|stop|restart|upgrade|force-stop|reopen-logs>"
 100         exit 1
 101         ;;
 102 esac