You can just use the overwrite attribute also.
<property name="ernex.core.build" value="Latest" overwrite="false" />
We use this also to specify a default setting mostly for properties that will
be set from the command line. debug mode for example.
<property name="debug" value="false" overwrite="false" />
BOb
From: Christopher Brandt [mailto:xtopher.bra...@gmail.com]
Sent: Tuesday, April 13, 2010 11:55 AM
To: NAnt Users
Cc: Durand Van Arnem; Bob Archer
Subject: Re: [NAnt-users] Using "if" to test for existence of properties
Same strategy here; ensure the property exists and then use the if attribute to
test its value. One place where you can use the if / unless attributes to test
existence is in setting the property itself, so giving it a default value. We
use the following to ensure that required properties are at least set to a
default value:
<property name="ernex.core.build" value="Latest"
unless="${property::exists('ernex.core.build')}" />
Hope that helps
---
Chris.
Continuous improvement is better than delayed perfection. - Mark Twain
On Tue, Apr 13, 2010 at 7:51 AM, Bob Archer
<bob.arc...@amsi.com<mailto:bob.arc...@amsi.com>> wrote:
I think I have run into this before. I think the easiest fix is to make sure
the property always exists. Then you can check to see if it is not empty.
BOb
From: Durand Van Arnem
[mailto:duran...@hotmail.com<mailto:duran...@hotmail.com>]
Sent: Tuesday, April 13, 2010 10:33 AM
To: NAnt Users
Subject: [NAnt-users] Using "if" to test for existence of properties
Hello,
I could use some advice about how to handle this situation:
I have a property, MyProperty, that may or may not be set. I want a task to
execute if the property is set, e.g.
<echo messsage="Hello ${MyProperty}!" if="${property::exists('MyProperty')" />
If MyProperty is not set, this task fails because NAnt appears to evaluate the
message portion regardless of the result of the IF evaluation. I could rewrite
like this:
<if test="${property::exists('MyProperty')}">
<echo message="Hello ${MyProperty}!" />
</if>
However, I run into the same issue with filterchains:
<!-- FAILS if MyProperty is not set, because NAnt evaluates the tokens
regardless of the IF result -->
<copy failonerror="true" verbose="true" todir="C:\Temp">
<fileset refid="Deploy-FileSet" />
<filterchain>
<replacetokens begintoken="[" endtoken="]" ignorecase="true"
if="${property::exists('MyProperty')}">
<token key="ABC" value="${MyProperty}" />
</replacetokens>
</filterchain>
</copy>
I'd rather not enclose the whole definition of the copy in an IF, with a nearly
identical "else" version for the case when MyProperty is not set.
How have you handled this situation?
Thanks,
Durand
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