如何根据环境变量的值执行 ant 目标？

Question

我想在两台不同的计算机上执行一个 ant 脚本。根据计算机的名称，应执行两个目标之一。以下无效：

<project name="import" default="all">
  <property environment="env"/>    
  <target name="staging" if="${env.COMPUTERNAME}='STG'">
    <echo>executed on staging</echo>
  </target>      
  <target name="production" if="${env.COMPUTERNAME}='PRD'">
    <echo>executed on production</echo>
  </target>      
  <target name="all" depends="staging,production" description="STG or PRD"/>
</project>

据我了解，"if" 只能与属性一起使用，它会检查是否设置了属性。但是有没有办法根据属性的值来创建条件？

Answer 1

我建议编写一个 "init" 目标，为以后的构建步骤设置您需要的任何条件，如果某些必需的属性未评估为预期的结果，构建也会失败。

例如：

<target name="all" depends="staging,production,init" />

<target name="staging" if="staging.environment" depends="init">
    <echo message="executed on staging" />
</target>

<target name="production" if="production.environment" depends="init">
    <echo message="executed on production" />
</target>

<target name="init">
    <condition property="staging.environment">
        <equals arg1="${env.COMPUTERNAME}" arg2="STG" />
    </condition>

    <condition property="production.environment">
        <equals arg1="${env.COMPUTERNAME}" arg2="PRD" />
    </condition>

    <fail message="Neither staging nor production environment detected">
        <condition>
            <not>
                <or>
                    <isset property="staging.environment" />
                    <isset property="production.environment" />
                </or>
            </not>
        </condition>
    </fail>
</target>

如何根据环境变量的值执行 ant 目标？

How can I execute an ant target depending on the value of an environment variable?

ant

if-statement

environment-variables

target