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Last active October 13, 2016 22:24
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#!/bin/sh
### BEGIN INIT INFO
# Provides: unicorn
# Required-Start: $all
# Required-Stop: $network $remote_fs $local_fs $syslog
# Default-Start: 2 3 4 5
# Default-Stop: 0 1 6
# Short-Description: Starts the unicorn app server
# Description: Starts unicorn using start-stop-daemon
### END INIT INFO
# https://unicorn.bogomips.org/SIGNALS.html
# http://unicorn.bogomips.org/examples/init.sh
# If a command fails, set -e will make the whole script exit,
# instead of just resuming on the next line.
set -e
# Treat unset variables as an error, and immediately exit.
# Exit your script if you try to use an uninitialised variable
set -u
# Feel free to change any of the following variables for your app:
APP_NAME=appname
AS_USER=deployer
HOME_PATH=/home/$AS_USER
APP_ROOT=$HOME_PATH/apps/$APP_NAME
CURRENT_APP_ROOT=$APP_ROOT/current
INIT_CONF=$HOME_PATH/.unicorn/$APP_NAME/config.rb
TIMEOUT=${TIMEOUT-60}
# make sure the app exists
cd $CURRENT_APP_ROOT || exit 1
CMD="cd $CURRENT_APP_ROOT && bundle exec unicorn -D -c $INIT_CONF -E production"
PID=$APP_ROOT/shared/pids/unicorn.pid
OLD_PIN="$PID.oldbin"
sig () {
test -s "$PID" && kill -$1 `cat $PID`
}
oldsig () {
test -s $OLD_PIN && kill -$1 `cat $OLD_PIN`
}
case "$1" in
start)
sig 0 && echo >&2 "Already running" && exit 0
echo "Starting"
su - $AS_USER -c "$CMD"
;;
stop)
echo "Stopping"
sig QUIT && exit 0
echo >&2 "Not running"
;;
force-stop)
echo "Force stopping"
sig TERM && exit 0
echo >&2 "Not running"
;;
restart|reload)
sig HUP && echo reloaded OK && exit 0
echo >&2 "Couldn't reload, starting '$CMD' instead"
su - $AS_USER -c "$CMD"
;;
upgrade)
if sig USR2 && sleep 2 && sig 0 && oldsig QUIT
then
n=$TIMEOUT
while test -s $OLD_PIN && test $n -ge 0
do
printf '.' && sleep 1 && n=$(( $n - 1 ))
done
echo
if test $n -lt 0 && test -s $OLD_PIN
then
echo >&2 "$OLD_PIN still exists after $TIMEOUT seconds"
exit 1
fi
exit 0
fi
echo >&2 "Couldn't upgrade, starting '$CMD' instead"
$CMD
;;
reopen-logs)
sig USR1 && echo rotated logs OK && exit 0
echo >&2 "Couldn't rotate logs" && exit 1
;;
*)
echo >&2 "Usage: $0 <start|stop|restart|upgrade|force-stop|reopen-logs>"
exit 1
;;
esac
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