无法使用 sudo 启动服务，因为 root 用户无法访问 Ruby

Question

tl；dr
正在尝试运行需要ruby才能运行的服务。但是，Ruby安装了RVM，根用户似乎无法访问它，从而产生错误/usr/bin/env: ruby: No such file or directory。rvmsudo不起作用。

背景
我有一个init.d脚本，它应该启动一个独角兽服务器。我将脚本保存在rails应用程序的config目录中，并从/etc/init.d/busables_unicorn进行符号链接。

$ ls -l /etc/init.d/busables_unicorn
-> lrwxrwxrwx 1 root root   62 2012-01-12 15:02 busables_unicorn -> /home/dtuite/dev/rails/busables/current/config/unicorn_init.sh

这个脚本（附加在底部）本质上只是运行以下命令：

$APP_ROOT/bin/unicorn -D -c $APP_ROOT/config/unicorn.rb -E production

其中$APP_ROOT是到rails应用程序的根的路径。每次在init.d脚本中执行该命令时，都应该以dtuite（我的部署）用户的身份执行。为了实现这一点，我调用su -c "$CMD" - dtuite而不仅仅是$CMD。

/bin/unicorn是Bundler生成的"binscript"，config/unicorn.rb包含一些传递给它的配置选项

独角兽binscript看起来像这样：

#!/usr/bin/env ruby
#
# This file was generated by Bundler.
#
# The application 'unicorn' is installed as part of a gem, and
# this file is here to facilitate running it.
#
require 'pathname'
ENV['BUNDLE_GEMFILE'] ||= File.expand_path("../../Gemfile",
  Pathname.new(__FILE__).realpath)
require 'rubygems'
require 'bundler/setup'
load Gem.bin_path('unicorn', 'unicorn')

现在，我正试图通过运行来启动我的独角兽服务

sudo service busables_unicorn start

然而，这会产生错误：

/usr/bin/env: ruby: No such file or directory

我相信发生这种情况是因为我以root用户的身份运行服务，但RVM在dtuite用户的主目录下安装了ruby，而root用户无法访问它

dtuite@localhost:$ which ruby
-> /home/dtuite/.rvm/rubies/ruby-1.9.3-p0/bin/ruby
dtuite@localhost:$ su
Password: 
root@localhost:$ which ruby
root@localhost:$

问题
我需要做些什么才能让它发挥作用？

我的设置
-ubuntu 11.10
-ruby 1.9.3p0（2011-10-30修订版33570）[i686-linux]
-nginx:nginx版本：nginx/1.0.5

我尝试过的

rvmsudo

$ rvmsudo service busables_unicorn start
/usr/bin/env: ruby: No such file or directory

rvm自动红宝石

$ sudo service cakes_unicorn start
-> [sudo] password for dtuite: 
-> -su: /home/dtuite/dev/rails/cakes/current/bin/unicorn: rvm-auto-ruby: bad interpreter: No such file or directory

这个问题可能会有所帮助，但老实说，我真的不明白

附录
busables_unicorn脚本的整体。

# INFO: This file is based on the example found at
# https://github.com/defunkt/unicorn/blob/master/examples/init.sh
# Modifications are courtesy of Ryan Bate's Unicorn Railscast
# Install Instructions:
# sudo ln -s full-path-to-script /etc/init.d/APP_NAME_unicorn
# Once installed, an app's unicorn can be reloaded by running
# sudo service APP_NAME_unicorn restart
#!/bin/sh
set -e
# Example init script, this can be used with nginx, too,
# since nginx and unicorn accept the same signals
# Feel free to change any of the following variables for your app:
TIMEOUT=${TIMEOUT-60}
APP_ROOT=/home/dtuite/dev/rails/busables/current
PID=$APP_ROOT/tmp/pids/unicorn.pid
# in order to access this, we need to first run
# 'bundle install --binstubs'. THis will fill our
# app/bin directory with loads of stubs for executables
# this is the command that is run when we run this script
CMD="$APP_ROOT/bin/unicorn -D -c $APP_ROOT/config/unicorn.rb -E production"
# we don't need an init config because this file does it's job
action="$1"
set -u
old_pid="$PID.oldbin"
cd $APP_ROOT || exit 1
sig () {
    test -s "$PID" && kill -$1 `cat $PID`
}
oldsig () {
    test -s $old_pid && kill -$1 `cat $old_pid`
}
case $action in
start)
    sig 0 && echo >&2 "Already running" && exit 0
  # NOTE: We have to change all these lines.
  # Otherwise, the app will run as the root user
  su -c "$CMD" - dtuite
    ;;
stop)
    sig QUIT && exit 0
    echo >&2 "Not running"
    ;;
force-stop)
    sig TERM && exit 0
    echo >&2 "Not running"
    ;;
restart|reload)
    sig HUP && echo reloaded OK && exit 0
    echo >&2 "Couldn't reload, starting '$CMD' instead"
  su -c "$CMD" - dtuite
    ;;
upgrade)
    if sig USR2 && sleep 2 && sig 0 && oldsig QUIT
    then
        n=$TIMEOUT
        while test -s $old_pid && test $n -ge 0
        do
            printf '.' && sleep 1 && n=$(( $n - 1 ))
        done
        echo
        if test $n -lt 0 && test -s $old_pid
        then
            echo >&2 "$old_pid still exists after $TIMEOUT seconds"
            exit 1
        fi
        exit 0
    fi
    echo >&2 "Couldn't upgrade, starting '$CMD' instead"
  su -c "$CMD" - dtuite
    ;;
reopen-logs)
    sig USR1
    ;;
*)
    echo >&2 "Usage: $0 <start|stop|restart|upgrade|force-stop|reopen-logs>"
    exit 1
    ;;
esac

Answer 1

听起来su并没有生成一个shell来读取通常设置rvm环境的配置文件。

我会尝试将你运行的命令更改为

 source "/home/dtuite/.rvm/scripts/rvm" && $APP_ROOT/bin/unicorn...

Answer 2

尝试在启动脚本开头的某个位置添加您的ruby路径，导出语句如下：

export PATH=/home/dtuite/.rvm/rubies/ruby-1.9.3-p0/bin:$PATH