Hi, I recently posted an issue on the nant-users list, but I think the underlying issue is one for this list. The problem is that the <fail/> task doesn't cause NAnt to terminate with a non-zero exit-code when executed from within a target defined by the nant.onsuccess property. I think that it should always result in a non-zero exit code (with the possible exception of when a BuildException is explicitly caught by the trycatch task from nant-contrib).
The scenario is that I'm using CruiseControl.NET to run a NAnt script as part
of a continuous build process. There are two conditions under which CCNET needs
to consider the build a failure:
1. Fatal errors: Typically this would be a compilation error. This is
considered fatal, as my build script cannot proceed further. In this case, the
relevant NAnt task will fail, the BuildException causes NAnt to unwind and it
terminates with a non-zero exit-code. CCNET detects this exit code, and
considers the build to have failed.
2. Non-fatal errors: This is where a condition is detected that should result
in CCNET considering the build to be a failure, but no specific task in the
NAnt script actually fails, and the script can nonetheless proceed to
completion, whereby NAnt would normally terminate with an exit code of zero.
Typically, such a compilation error might be an FxCop rule violation, or a
unit-test failure.
In the case of non-fatal error, I'm trying to force the NAnt script to fail
using the technique illustrated in the following build script (attached), that
shows three different cases:
1. Case 1: This simply illustrates NAnt running successfully.
2. Case 2: This is the typical use of the <fail/> task to cause a fatal build
error.
3. Case 3: This is how I wish to deal with non-fatal errors. The "case3" target
modifies a property to indicate that a non-fatal error has occurred, but script
execution continues. After the rest of the script has completed, the
"on-success" target checks the "error-message" property, and tries to <fail/>
the build if a non-fatal error was detected.
<project name="NAnt bug" xmlns="http://nant.sf.net/nant-all.xsd";>
<property name="error-message" value=""/>
<target name="case1">
<echo message="This target should result in an exit-code that
indicates success."/>
</target>
<target name="case2">
<fail message="This target should result in a exit-code that
indicates failure."/>
</target>
<target name="case3">
<echo message="This target should result in a exit-code that
indicates failure."/>
<property name="error-message" value="Non-fatal error."/>
</target>
<property name="nant.onsuccess" value="on-success"/>
<target name="on-success">
<fail message="Failure forced"
if="${string::get-length(error-message) > 0}"/>
</target>
</project>
The following batch script can be used to run the three different cases:
nant case1
echo Error-level: expected 0, actual %errorlevel%
nant case2
echo Error-level: expected 1, actual %errorlevel%
nant case3
echo Error-level: expected 1, actual %errorlevel%
Cases 1 and 2 work just fine. Case 3 should display this,
Error-level: expected 1, actual 1
but it actually displays this:
Error-level: expected 1, actual 0
In case 3, because NAnt terminates with an exit code of zero, CCNET assumes
that the build was successful, when in fact I want CCNET to consider the build
a failure. It's my guess that the problem isn't specific to the <fail/> task -
NAnt is probably consuming any BuildException that may be raised by the
on-success task. I think that this is an error. If there's an error in the
on-success target, the build should fail, even when the main execution of the
build script was successful.
Chris
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21:50
nantbug.build
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