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mqjeff
PostPosted: Thu Jan 26, 2012 8:36 am    Post subject: arguing with Ant Reply with quote

Grand Master

Joined: 25 Jun 2008
Posts: 17447
I have recently had a fun time trying to figure out why an Ant task was not properly executing my mqsicreatebar command.

I had done something useful sounding by putting the values that would be passed to -o and -p into specific properties in a properties file (thus ensuring that I would not need to alter my script to build different projects!).

So I had something like
Code:
<exec executable="mqsicreatebar"....>
<arg value=... />
<arg value="-p" />
<arg value="${projectList}"/>
<arg value="-o"/>
<arg value="${objectList}/>


The fun part of this is that it would work as long as project list and object list were only a single value.

When Ant sees <arg value=""> and it determines that the contents of the value includes spaces, then Ant decides that it needs to pass this value wrapped in double-quotes.

So when I ended up with more than one project and more than one object, ant would be passing
Code:
mqsicreatebar ... -o "object object" -p "project project"

instead of
Code:
mqsicreatebar ... -o object object -p project project


The workaround for this is to use <arg line=""> instead of <arg value="">.

So
Code:
<exec executable="mqsicreatebar"....>
<arg value=... />
<arg value="-p" />
<arg LINE="${projectList}"/>
<arg value="-o"/>
<arg LINE="${objectList}/>


where I have put LINE in capitals for emphasis, not correctness.
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lancelotlinc
PostPosted: Thu Jan 26, 2012 8:39 am    Post subject: Reply with quote

Jedi Knight

Joined: 22 Mar 2010
Posts: 4941
Location: Bloomington, IL USA
Nice tip ! Thanks.
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