unicorn initialization script

unicorn_votaprato

#!/bin/sh

### BEGIN INIT INFO
# Provides:          unicorn
# Required-Start:    $all
# Required-Stop:     $all
# 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

set -e

USAGE="Usage: $0 <start|stop|restart|upgrade|rotate|force-stop>"

# app settings
USER="emanoel"
APP_NAME="votaprato"
APP_ROOT="/home/$USER/$APP_NAME"
ENV="production"

# environment settings
PATH="/home/$USER/.rbenv/shims:/home/$USER/.rbenv/bin:$PATH"
CMD="cd $APP_ROOT && bundle exec unicorn -c config/unicorn.rb -E $ENV -D"
PID="$APP_ROOT/shared/pids/unicorn.pid"
OLD_PID="$PID.oldbin"

# make sure the app exists
cd $APP_ROOT || exit 1

sig () {
  test -s "$PID" && kill -$1 `cat $PID`
}

oldsig () {
  test -s $OLD_PID && kill -$1 `cat $OLD_PID`
}

case $1 in
  start)
    sig 0 && echo >&2 "Already running" && exit 0
    echo "Starting $APP_NAME"
    su - $USER -c "$CMD"
    ;;
  stop)
    echo "Stopping $APP_NAME"
    sig QUIT && exit 0
    echo >&2 "Not running"
    ;;
  force-stop)
    echo "Force stopping $APP_NAME"
    sig TERM && exit 0
    echo >&2 "Not running"
    ;;
  restart|reload|upgrade)
    sig USR2 && echo "reloaded $APP_NAME" && exit 0
    echo >&2 "Couldn't reload, starting '$CMD' instead"
    $CMD
    ;;
  rotate)
    sig USR1 && echo rotated logs OK && exit 0
    echo >&2 "Couldn't rotate logs" && exit 1
    ;;
  *)
    echo >&2 $USAGE
    exit 1
    ;;
esac

Unicorn Service result:

● unicorn_votaprato.service - LSB: starts the unicorn app server
Loaded: loaded (/etc/init.d/unicorn_votaprato; bad; vendor preset: enabled)
Active: failed (Result: exit-code) since Ter 2016-10-18 15:40:25 BRT; 33min ago
Docs: man:systemd-sysv-generator(8)
Process: 32412 ExecStart=/etc/init.d/unicorn_votaprato start (code=exited, status=1/FAILURE)

Out 18 15:40:25 Digitron unicorn_votaprato[32412]: /var/lib/gems/2.3.0/gems/bundler-1.12.5/lib/bundl
Out 18 15:40:25 Digitron unicorn_votaprato[32412]: /var/lib/gems/2.3.0/gems/bundler-1.12.5/lib/bundl
Out 18 15:40:25 Digitron unicorn_votaprato[32412]: /var/lib/gems/2.3.0/gems/bundler-1.12.5/lib/bundl
Out 18 15:40:25 Digitron unicorn_votaprato[32412]: /var/lib/gems/2.3.0/gems/bundler-1.12.5/lib/bundl
Out 18 15:40:25 Digitron unicorn_votaprato[32412]: /usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_requ
Out 18 15:40:25 Digitron unicorn_votaprato[32412]: /usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_requ
Out 18 15:40:25 Digitron systemd[1]: unicorn_votaprato.service: Control process exited, code=exited st
Out 18 15:40:25 Digitron systemd[1]: Failed to start LSB: starts the unicorn app server.
Out 18 15:40:25 Digitron systemd[1]: unicorn_votaprato.service: Unit entered failed state.
Out 18 15:40:25 Digitron systemd[1]: unicorn_votaprato.service: Failed with result 'exit-code'.

Just wondering if you've found a solution to this yet? I just ran into the exact same error here.