You can try the following:
Stock Ant:
1) Wrap your call to exec in a target, and place an "if" on the target:
<project>
<condition property = "file.found">
<available file = "your.file"/>
</condition>
<target name="exec" if = "file.found">
<exec...>
...
</exec>
<touch file = "your.file"/>
</target>
</project>
2) Use AntContrib's if task:
<project>
<!-- include Ant Contrib here... -->
<if>
<available file = "your.file"/>
<then>
<exec...>
...
</exec>
<touch file = "your.file"/>
</then>
</if>
</project>
On Mon, 29 Dec 2008, removeps-gene...@yahoo.com wrote:
How can I make the exec task smart enough so that it won't do anything if the
file generated by the task has already been created?
For example,
<copy file="srcFile.txt" tofile="destFile.txt" verbose="true"/>
does nothing the second time. Not sure how it works, but maybe if the
timestamp of destFile.txt is equal to or larger than srcFile.txt than nothing
happens.
So what I want is something like a generatedfile argument for exec. For
example:
<exec executable="${java.home}/bin/keytool.exe" generatedfile="${keystore}">
<arg value="-genkey"/>
<arg value="-alias"/>
<arg value="${alias}"/>
<arg value="-keyalg"/>
<arg value="RSA"/>
<arg value="-validity"/>
<arg value="36000"/>
<arg value="-keystore"/>
<arg value="${keystore}"/>
<arg value="-storepass"/>
<arg value="${storepass}"/>
<arg value="-keypass"/>
<arg value="${keypass}"/>
<arg value="-dname"/>
<arg value="${dname}"/>
</exec>
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