Capistrano:我可以为整个 cap 会话设置一个环境变量吗? [英] Capistrano: Can I set an environment variable for the whole cap session?

问题描述

我有一个安装了标准 Ruby 和 Ruby Enterprise 的登台服务器.由于标准 Ruby 拒绝安装关键 gem，我需要设置 $PATH 以便 ruby​​/gem/rake/etc.始终参考 REE 版本.由于我使用 Capistrano 部署到我们的机器上，所以我需要在 Capistrano 中进行.

I've got a staging server with both standard Ruby and Ruby Enterprise installed. As standard Ruby refuses to install a critical gem, I need to set $PATH so that ruby/gem/rake/etc. always refer to the REE versions. And since I use Capistrano to deploy to our machines, I need to do it in Capistrano.

我如何设置一次环境变量，并让它在 Capistrano 会话中持续存在?

1) 在 bashrc 文件中很容易做到，但 Capistrano 不读取 bashrc 文件.

1) It's easy to do in bashrc files, but Capistrano doesn't read bashrc files.

2) 我会使用 Capistrano 的

2) I'd use Capistrano's

default_environment['PATH'] = 'Whatever'

但 Capistrano 使用这些环境变量，例如

but Capistrano uses these environment variables like

env PATH=Whatever command arg ...

并且每当在传递给 env 的可执行文件中启动另一个 shell 时，它们就会丢失.就像你使用 sudo 时一样.哪一点很重要:

and they're lost whenever another shell is spun up within the executable passed to env. Like when you use sudo. Which is kinda important:

[holt@Michaela trunk]$ env VAR=hello ruby -e "puts ENV['VAR']"
hello
[holt@Michaela trunk]$ env VAR=hello sudo ruby -e "puts ENV['VAR']"
nil

3) 我不能使用 bash 导出命令，因为这些命令也丢失了 - Capistrano 似乎为每个命令(或类似的命令)启动了一个新的 shell，这也丢失了:

3) And I can't use the bash export command, as these are lost too - Capistrano seems to start up a new shell for each command (or something like that), and that's lost, too:

cap> export MYVAR=12
[establishing connection(s) to xxx.xxx.xxx.xxx]
cap> echo $MYVAR
 ** [out :: xxx.xxx.xxx.xxx] 
cap> 

4) 我也尝试过使用 Capistrano 的 :shell 和 :pty 选项(并与其他方法结合使用)，但也没有运气.

4) I've tried messing with Capistrano's :shell and :pty options as well (and in combination with the other approaches), but no luck there, either.

那么 - 这样做的正确方法是什么? 这似乎是一项基本任务，应该有一个非常简单的方法来完成它，但我没有想法.有人吗?

So - what's the right way to do this? This seems like such a basic task that there should be a really simple way to accomplish it, but I'm out of ideas. Anyone?

提前致谢！

推荐答案

我也有同样的问题，但我觉得这个解决方案更好:

I have the exactly same problem, but I think this solution is better:

set :default_environment, { 
  'env_var1' => 'value1',
  'env_var2' => 'value2'
}

这对我来说就像一个魅力.

This works for me like a charm.

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