This works for me:
<project>
<property environment="env"/>
<property name="is.dev.home" value="${env.IS_DEV_HOME}"/>
<fail message="IS_DEV_HOME/is.dev.home variable is not set.">
<condition>
<equals arg1="${is.dev.home}" arg2="$${env.IS_DEV_HOME}"/>
</condition>
</fail>
<echo>'${is.dev.home}'</echo>
</project>
Jan
>-----Ursprüngliche Nachricht-----
>Von: Dominique Devienne [mailto:[EMAIL PROTECTED]
>Gesendet: Freitag, 13. April 2007 23:18
>An: Ant Users List
>Betreff: Re: ant property not set question
>
>On 4/13/07, Philip Swenson <[EMAIL PROTECTED]> wrote:
>> I have a property that is declared like this:
>> <property name="is.dev.home" value="${env.IS_DEV_HOME}"/>
>
>You must wrap your <property> above inside a <target name="..."
>if="env.IS_DEV_HOME" unless="is.dev.home">, to only set is.dev.home
>when it's not already set, and only when IS_DEV_HOME env. var does
>exist. Or use Ant-Contrib's <ac:if> to avoid the additional <target>,
>with the <isset> condition. --DD
>
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