How to assign exec's output to a property in NAnt - cruisecontrol.net

Question

My aim is to fill property with output of command "git describe".
I have a property:
<property name="build.version" value = ""/>
And I want to fill it with output of the following command: git describe
I tried:
<exec program='${git.executable}' outputproperty='build.version'>
<arg value='describe' />
</exec>
but unlike the Ant, NAnt doesn't support outputproperty :( only output (to file).

Answer 1

You're right. You have resultproperty attribute to hold the exit code and output attribute to redirect the output.
Why don't you redirect the output and load the file afterwards via loadfile task:
<target name="foo">
<property
name="git.output.file"
value="C:\foo.txt" />
<exec program="${git.executable}" output="${git.output.file}">
<arg value="describe" />
</exec>
<loadfile
file="${git.output.file}"
property="git.output" />
</target>

Answer 2

Using trim, you can get rid of the carriage return character at the end. For instance, in the example above, add a line at the end to trim the string
<target name="foo">
<property
name="git.output.file"
value="C:\foo.txt" />
<exec program="${git.executable}" output="${git.output.file}">
<arg value="describe" />
</exec>
<loadfile
file="${git.output.file}"
property="git.output" />
<property name="git.ouput.trimmed" value="${string::trim(git.output)}" />
</target>