Gentoo Redmine Unicorn: The `unicorn.redmine` file should be created as `unicorn` file in `/etc/init.d/`. After that you should symlink the file to the correct app name, for example to `unicorn.redmine`. Create a configuration file in `/etc/conf.d/` that should be named as the app name.

conf.d unicorn.redmine

## /etc/conf.d/unicorn

## Project directory where the ruby files are located 
PROJECT_DIR="/local/sites/com/<something>/redmine"

## User which unicorn will run (Default: unicorn)
PROJECT_USER="redmine"

## Project name only be used for identification (Default: service name)
#PROJECT_NAME=""

## Path to the rvm binary (Default: ~${PROJECT_USER}/.rvm/bin/rvm)
#RVM=${PROJECT_USER}/.rvm/bin/rvm

## Ruby version used in the RVM to exec unicorn (Default: all)
#RVM_RUBY_VERSION="all"

## RVM arguments that using some variables above (Default: ${RVM_RUBY_VERSION} exec)
#RVM_ARGS=${RVM_RUBY_VERSION} exec

## PID file location (Default: /var/run/unicorn_${PROJECT_NAME}.pid)
UNICORN_PID="/local/sites/com/<something>/redmine/unicorn/unicorn.pid"

## Additional parameters for the unicorn binary (Default: -D)
#UNICORN_PARAM="-D"

## Configuration file for the unicorn service
UNICORN_CONFIG="/local/sites/com/<something>/redmine/unicorn/config.rb"

init.d unicorn.redmine

#!/sbin/runscript
# Copyright 1999-2013 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Header: $

depend() {
  need net
	use nginx
	after sshd
}

configtest() {
	ebegin "Checking ${SVCNAME} configuration"
	checkconfd
	eend $?
}

checkconfd() {
	if [ ${SVCNAME} == 'unicorn' ]; then
		eerror "Symlink the file to the correct service name and"
		eerror "create a new configuration file in /etc/conf.d"
		return 1
	fi

	PROJECT_USER=${PROJECT_USER:-"unicorn"}
	PROJECT_NAME=${PROJECT_NAME:-${SVCNAME#*-}}

	UNICORN_PID=${UNICORN_PID:-"/var/run/unicorn_${PROJECT_NAME}.pid"}
	UNICORN_PARAM=${UNICORN_PARAM:-"-D"}
	
	RVM=${RVM:-"~${PROJECT_USER}/.rvm/bin/rvm"}
	if [ ! -r ${RVM} ]; then
		eerror "RVM does not exists: ${RVM}"
		return 1
	fi

	RVM_RUBY_VERSION=${RVM_RUBY_VERSION:-"all"}
	RVM_ARGS=${RVM_ARGS:-"${RVM_RUBY_VERSION} exec"}
	
	PROJECT_DIR=${PROJECT_DIR}
	if [ ! -d ${PROJECT_DIR} ]; then
		eerror "PROJECT_DIR does not exist: ${PROJECT_DIR}"
		return 1
	fi

	UNICORN_CONFIG=${UNICORN_CONFIG}
	if [ ! -r ${UNICORN_CONFIG} ]; then
		eerror "UNICORN_CONFIG does not exist: ${UNICORN_CONFIG}"
		return 1
	fi

	DAEMON=${DAEMON:-"unicorn_rails -c ${UNICORN_CONFIG} ${UNICORN_PARAM}"}
}

start() {
	configtest || return 1

	ebegin "Starting app ${PROJECT_NAME}"
	start-stop-daemon --start  \
		-u ${PROJECT_USER} \
		-d ${PROJECT_DIR}  \
		-p ${UNICORN_PID}  \
		"${RVM}" -- ${RVM_ARGS} ${DAEMON}
	eend $?
}

stop() {
	configtest || return 1

	ebegin "Stopping app ${PROJECT_NAME}"
	start-stop-daemon --stop -u "${PROJECT_USER}" \
		-p "${UNICORN_PID}" "${RVM}"
	eend $?
}