Ant 可以从属性文件中扩展环境变量吗? [英] Can Ant expand environment variables from a properties file?

问题描述

我有一个关于 Ant 及其对环境变量的处理的问题.为了说明，我有一个小样本.

I have a question regarding Ant and its treatment of environment variables. To illustrate I have a small sample.

给定 Ant 构建文件 test.xml:

Given the Ant build file test.xml:

<project name="myproj" default="testProps">

    <property environment="env"/>

    <target name="testProps">
            <echo message="${env.MyEnvVar}"/>
            <echo message="${MY_PROPERTY}"/>
    </target>
</project>

和属性文件 test.props:

And the properties file test.props:

MY_PROPERTY=${env.MyEnvVar}

现在将环境变量 MyEnvVar 设置为某个值(在我的情况下为 foo)并使用此命令行运行 Ant:

Now set the environment variable MyEnvVar to some value (foo in my case) and run Ant using this command line:

ant -f test.xml -propertyfile test.props testProps

我得到的输出是:

[echo] foo
[echo] ${env.MyEnvVar}

我想知道的是是否有任何方法可以构建输入属性文件，以便我得到

What I would like to know is whether there is any way to structure the input properties file such that I get

[echo] foo
[echo] foo

也就是说，我想在 Ant 脚本中替换的属性文件中命名一个环境变量.注意 - 我知道如何直接访问环境变量(就像这里所做的那样).我需要做的是使用一组 Ant 脚本，这些脚本期望在使用不同名称定义相同属性的环境中包含一组属性.因此想到了在属性文件中桥接"它们.

That is, I would like to name an environment variable in the properties file which is replaced within the Ant script. Note - I know how to access environment variables directly (as is done here). What I need to do is make use of a set of Ant scripts that expect one collection of properties in an environment that defines the same properties using different names. Thus the thought of "bridging" them in a properties file.

我使用的是 Ant 版本 1.6.5.

I am using Ant version 1.6.5.

推荐答案

您需要阅读test.props 属性文件 环境 - 您可以使用另一个property任务，即添加

You need to read the test.props property file after the environment - you could do so using another property task, i.e. add

<property file="test.props" />

在您现有的属性环境任务之后.

全文:

<property environment="env" />
<property file="test.props" />

<target name="testProps">
    <echo message="${env.MyEnvVar}"/>
    <echo message="${MY_PROPERTY}"/>
</target>

当您在命令行上提供属性文件时，它会在构建内容之前处理，但当时 ${env.MyEnvVar} 尚未设置.

When you supply the properties file on the command line this gets processed before the content of the build, but at that time ${env.MyEnvVar} is not yet set.

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