if and unless in ant

Question

I would like to clarify the if and unless statements in ANT script

I have the following code:

<condition property="hasExtensions">
    <contains string="${Product_version}" substring="Extensions">
</condition>

<exec executable="${TrueCM_App}\ssremove.exe" unless="hasExtensions">
    ...
</exec>

Does that mean the above <exec> would execute ssremove.exe if Product_version does not contain the string "Extensions"?

Then how about the opposite case: if it contains the string "Extensions"? Will my code look like this:

<condition property="hasExtensions">
    <contains string="${Product_version}" substring="Extensions">
</condition>
<!-- here below it does not have the string "Extensions" -->
<exec executable="${TrueCM_App}\ssremove.exe" unless="hasExtensions">
    ...
</exec>

<!-- below is for if it has the string "Extensions" -->
<exec executable="${TrueCM_App}\ssremove.exe" if="hasExtensions">
    ...
</exec>

Answer 1

You've got the logic right, but I'm not sure that the <exec> task accepts the if and unless attributes. See the docs for more info.

You will probably need to wrap the <exec> tasks in a target that checks the condition. For example:

<condition property="hasExtensions">
    <contains string="${Product_version}" substring="Extensions">
</condition>

<target name="ssremove" unless="hasExtensions">
    <exec executable="${TrueCM_App}\ssremove.exe">
        ...
    </exec>
</target>

Then if you run ant ssremove I think you will get what you want.