如何在 Jenkins 中使用 Windows 批处理命令使用环境变量? [英] How are environment variables used in Jenkins with Windows Batch Command?

问题描述

我正在尝试在我的 xcopy 脚本中使用 Jenkins(全局)环境变量.

I'm trying to use Jenkins (Global) environment variables in my xcopy script.

${WORKSPACE} doesn't work
"${WORKSPACE}" doesn't work
'${WORKSPACE}' doesn't work

推荐答案

我对 Jenkins 一无所知，但看起来您正在尝试使用某种形式的 unix 语法访问环境变量 - 这行不通.

I know nothing about Jenkins, but it looks like you are trying to access environment variables using some form of unix syntax - that won't work.

如果变量的名称是 WORKSPACE，则该值在 Windows 批处理中使用
%WORKSPACE%.这种形式的扩展是在解析时执行的.例如，这将打印到屏幕上 WORKSPACE 的值

If the name of the variable is WORKSPACE, then the value is expanded in Windows batch using
%WORKSPACE%. That form of expansion is performed at parse time. For example, this will print to screen the value of WORKSPACE

echo %WORKSPACE%

如果你在执行时需要这个值，那么你需要使用延迟扩展!WORKSPACE!.默认情况下通常不启用延迟扩展.使用 SETLOCAL EnableDelayedExpansion 来启用它.由于括号内的代码块和/或由 &、&& 或 || 连接的多个命令，通常需要延迟扩展一次全部解析，因此除非您使用延迟扩展，否则无法稍后在同一块中读取在块内分配的值.

If you need the value at execution time, then you need to use delayed expansion !WORKSPACE!. Delayed expansion is not normally enabled by default. Use SETLOCAL EnableDelayedExpansion to enable it. Delayed expansion is often needed because blocks of code within parentheses and/or multiple commands concatenated by &, &&, or || are parsed all at once, so a value assigned within the block cannot be read later within the same block unless you use delayed expansion.

setlocal enableDelayedExpansion
set WORKSPACE=BEFORE
(
  set WORKSPACE=AFTER
  echo Normal Expansion = %WORKSPACE%
  echo Delayed Expansion = !WORKSPACE!
)

上面的输出是

Normal Expansion = BEFORE
Delayed Expansion = AFTER

在命令行中使用 HELP SET 或 SET/? 来获取有关 Windows 环境变量和各种扩展选项的更多信息.例如，它解释了如何进行搜索/替换和子字符串操作.

Use HELP SET or SET /? from the command line to get more information about Windows environment variables and the various expansion options. For example, it explains how to do search/replace and substring operations.

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