通过ENV VAR到exec.Command吗? [英] pass ENV VAR to exec.Command?

问题描述

我正在为流行的命令行工具(ansible-playbook)编写go包装器，并且需要通过exec.Command调用传递参数.相当于bash:

I'm writing a go wrapper for a popular command line tool (ansible-playbook) and I need to pass a parameter through with the exec.Command call. The bash equivalent would be:

MY_VAR=some_value ansible-playbook -i custom-inventory playbook.yml

以前，我只是使用os.Setenv导出MY_VAR，但是这会导致并行执行剧本出现问题.因此，我想在命令前传递var，以便每个调用对此var都有自己的值.

Previously I was just exporting MY_VAR using os.Setenv, but that causes problems for parallel executions of the playbook. So I want to pass the var in front of the command so that each call has it's own value for this var.

我不太确定如何使用exec.Command来执行此操作，因为该函数的第一个参数是"command".有提示吗?

I'm not really sure how to do this with exec.Command since the first parameter to that function is "command". Any tips?

edit:我尝试使用Cmd结构的Env字段，但是它覆盖了所有环境变量.我有大量的配置集，我只想覆盖这个特定的环境变量.这不可能吗?

edit: I have tried using the Env field of the Cmd struct but that overrides all environment variables. I have a significant amount of configuration set and I would just like to override this one specific environment variable. Is this not possible??

推荐答案

对于那些想知道解决方案的人:

For those wondering for the solution:

    cmd := exec.Command("ansible-playbook", args...)
    cmd.Env = os.Environ()
    cmd.Env = append(cmd.Env, "MY_VAR=some_value")

将保留现有环境，然后编写所需的一个值.

Will preserve the existing environment and then write the one value that you want.

感谢godoc和开源！！

Thank goodness for godoc and open source!!

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