gistfile1.sh

#!/bin/bash
exec 2>&1

function is_unicorn_alive {
  set +e
  if [ -n $1 ] && kill -0 $1 >/dev/null 2>&1; then
    echo "yes"
  fi
  set -e
}

CUR_PID_FILE=/home/beyond/app/shared/pids/unicorn.pid
OLD_PID_FILE=$CUR_PID_FILE.oldbin

if [ -e $OLD_PID_FILE ]; then
  OLD_PID=$(cat $OLD_PID_FILE)
  echo "Waiting for existing master ($OLD_PID) to exit"
  while [ -n "$(is_unicorn_alive $OLD_PID)" ]; do
    /bin/echo -n '.'
    sleep 2
  done
fi
 
if [ -e $CUR_PID_FILE ]; then
  CUR_PID=$(cat $CUR_PID_FILE)
  if [ -n "$(is_unicorn_alive $CUR_PID)" ]; then
    echo "Unicorn master already running. PID: $CUR_PID"
    RUNNING=true
  fi
fi
 
if [ ! $RUNNING ]; then
  echo "Starting unicorn"
  cd /home/beyond/app/current
  
  exec /usr/bin/chpst \
    -u beyond:beyond \
    bundle exec \
    unicorn \
    -E production \
    -c /etc/unicorn/beyond.rb -D

  sleep 3
  CUR_PID=$(cat $CUR_PID_FILE)
fi
 
function restart {
    echo "Initialize new master with USR2"
    kill -USR2 $CUR_PID
    # Make runit restart to pick up new unicorn pid
    sleep 2
    echo "Restarting service to capture new pid"
    exit
}
 
function graceful_shutdown {
    echo "Initializing graceful shutdown"
    kill -QUIT $CUR_PID
}
 
function unicorn_interrupted {
    echo "Unicorn process interrupted. Possibly a runit thing?"
}
 
trap restart HUP QUIT USR2 INT
trap graceful_shutdown TERM KILL
trap unicorn_interrupted ALRM
 
echo "Waiting for current master to die. PID: ($CUR_PID)"
while [ -n "$(is_unicorn_alive $CUR_PID)" ]; do
  /bin/echo -n '.'
  sleep 2
done
echo "You've killed a unicorn!"