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From "David Weintraub" <qazw...@gmail.com>
Subject Re: How to make exec not run by timestamp?
Date Tue, 30 Dec 2008 18:00:16 GMT
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 <sfloess@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-generic@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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>>
>>
>
> 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-unsubscribe@ant.apache.org
> For additional commands, e-mail: user-help@ant.apache.org
>
>



-- 
--
David Weintraub
qazwart@gmail.com

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