How does interpret an empty output property

[st...@sungard.com]

Hi,

I have a macrodef passing on a logfile attribute to exec's output
property. If I want as default to have no logfile, how do write this in
the macrodef? The easiest logic for me would be if output="" means no
redirection as I then could use <attribute name="logfile" default=""/>.

Sten Rosendahl

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Re: How does interpret an empty output property

[Peter Reilly <pe...@apache.org>]

The exec task does not process the string. Ant's core code
converts the string to a File object  - in this case an empty string
will get converted to the base dir.

So with:
<project default="t">
  <target name="t">
    <exec executable="ls" output=""/>
  </target>
</project>
one gets:
/home/preilly/learning/a/exec/build.xml:3: Execute failed: 
java.io.FileNotFoundException: /home/preilly/learning/a/exec (Is a 
directory)

One may one the ant-contribs's <if/> task to implement the logic.

Peter
sten.rosendahl@sungard.com wrote:

>Hi,
>
>I have a macrodef passing on a logfile attribute to exec's output
>property. If I want as default to have no logfile, how do write this in
>the macrodef? The easiest logic for me would be if output="" means no
>redirection as I then could use <attribute name="logfile" default=""/>.
>
>Sten Rosendahl
>
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>To unsubscribe, e-mail: user-unsubscribe@ant.apache.org
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>
>
>  
>


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Re: How does interpret an empty output property

[Matt Benson <gu...@yahoo.com>]

--- sten.rosendahl@sungard.com wrote:
[SNIP]
> I have a macrodef passing on a logfile attribute to
> exec's output
> property. If I want as default to have no logfile,
> how do write this in
> the macrodef?
[SNIP]

If you have a fairly limited number of platforms to
work on, like Un*x vs. dos-based (Windows etc.), you
could do something like this:

<target name="foo" depends="defaultlogfile">
  <!-- do something with ${logfile} -->
</target>

<target name="defaultlogfile">
  <condition property="logfile" value="/dev/null">
    <os family="unix" />
  </condition>
  <condition property="logfile" value="NUL">
    <or>
      <os family="windows" />
      <!-- should work on netware as well -->
      <os family="netware" />
    </or>
  </condition>
  <fail unless="logfile" />
</target>

> 
> Sten Rosendahl

-Matt


		
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