Although you are right that Scott can use the <available> task to see
if the target is already created, I suspect Scott would want to run
the <exec> target if one of the dependencies involved has been
updated.
He should look at the <uptodate> task. This allows you to specify a
bunch of dependencies, then if one of those dependencies is newer than
the specified target, a property is then set.
You can then check this property when you execute your actual task.
Normal way to do this is something like this:
<target name="exec-task-test">
<uptodate
property="key.already.built"
target="${keystore}">
<srcfiles>
<fileset dir=.../>
</srcfiles>
</uptodate>
<target name="execute-task"
depends="exec-task-test"
unless="key.already.built">
<exec ...>
</target>
The AntContrib <outofdate> task is much more flexible and easier to
use. However, you have to install the AndContrib library in your Ant
classpath, and you have to define a <taskdef> in your build file. So,
most people simply opt for the uptodate task.
On Tue, Dec 30, 2008 at 12:13 PM, Scot P. Floess <sflo...@nc.rr.com> wrote:
>
> You can try the following:
>
> Stock Ant:
>
> 1) Wrap your call to exec in a target, and place an "if" on the target:
>
> <project>
> <condition property = "file.found">
> <available file = "your.file"/>
> </condition>
>
> <target name="exec" if = "file.found">
> <exec...>
> ...
> </exec>
>
> <touch file = "your.file"/>
> </target>
> </project>
>
> 2) Use AntContrib's if task:
>
> <project>
> <!-- include Ant Contrib here... -->
>
> <if>
> <available file = "your.file"/>
> <then>
> <exec...>
> ...
> </exec>
>
> <touch file = "your.file"/>
> </then>
> </if>
> </project>
>
>
>
>
> On Mon, 29 Dec 2008, removeps-gene...@yahoo.com wrote:
>
>> How can I make the exec task smart enough so that it won't do anything if
>> the file generated by the task has already been created?
>>
>> For example,
>>
>> <copy file="srcFile.txt" tofile="destFile.txt" verbose="true"/>
>>
>> does nothing the second time. Not sure how it works, but maybe if the
>> timestamp of destFile.txt is equal to or larger than srcFile.txt than
>> nothing happens.
>>
>> So what I want is something like a generatedfile argument for exec. For
>> example:
>>
>> <exec executable="${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>
>>
>>
>>
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: user-unsubscr...@ant.apache.org
>> For additional commands, e-mail: user-h...@ant.apache.org
>>
>>
>
> Scot P. Floess
> 27 Lake Royale
> Louisburg, NC 27549
>
> 252-478-8087 (Home)
> 919-754-4592 (Work)
>
> Chief Architect JPlate http://sourceforge.net/projects/jplate
> Chief Architect JavaPIM http://sourceforge.net/projects/javapim
>
> Architect Keros http://sourceforge.net/projects/keros
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: user-unsubscr...@ant.apache.org
> For additional commands, e-mail: user-h...@ant.apache.org
>
>
--
--
David Weintraub
qazw...@gmail.com
---------------------------------------------------------------------
To unsubscribe, e-mail: user-unsubscr...@ant.apache.org
For additional commands, e-mail: user-h...@ant.apache.org
