I have an Ant XML file which I use for build.
I have 3 properties. I want to break the build if these properties does not contain any value. Also I want to break the build if the value is empty.
How can I do this in Ant?
I a using Ant and not Ant-contrib.
You can use conditions using the <fail>
task:
<fail message="Property "foo" needs to be set to a value">
<condition>
<or>
<equals arg1="${foo}" arg2=""/>
<not>
<isset property="foo"/>
</not>
</or>
</condition>
This is equivalent to saying if (not set ${foo} or ${foo} = "")
is pseudocode. You have to read the XML conditions from the inside out.
You could have used the <unless>
clause on the <fail>
task if you only cared whether or not the variable was set, and not whether it has an actual value.
<fail message="Property "foo" needs to be set"
unless="foo"/>
However, this won't fail if the property is set, but has no value.
There's a trick that can make this simpler
<!-- Won't change the value of `${foo}` if it's already defined -->
<property name="foo" value=""/>
<fail message="Property "foo" has no value">
<condition>
<equals arg1="${foo}" arg2=""/>
</condition>
</fail>
Remember that I can't reset a property! If ${foo}
already has a value, the <property>
task above won't do anything. This way, I can eliminate the <isset>
condition. It might be nice since you have three properties:
<property name="foo" value=""/>
<property name="bar" value=""/>
<property name="fubar" value=""/>
<fail message="You broke the build, you dufus">
<condition>
<or>
<equals arg1="${foo}" arg2=""/>
<equals arg1="${bar}" arg2=""/>
<equals arg1="${fubar}" arg2=""/>
</or>
</condition>
</fail>