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<target name="document" description="Generate documentation and reports."> </target> <target name="publish" description="Place the compiled assets in agreed location."> </target> <target name="notify" description="Tell everyone of the success or failure."> </target> <target name="fail"> </target> <target name="help"> <echo message="The skeleton file for the build process is designed to execute the following targets in turn:"/> <echo message="-- clean"/> <echo message="-- get"/> <echo message="-- version"/> <echo message="-- build"/> <echo message="-- test"/> <echo message="-- document"/> <echo message="-- publish"/> <echo message="-- notify"/> </target> </project> With the specific descriptions of the project in place, we can move on to the details of each target. But before we do, we should consider a very important question: What if it all goes wrong
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Error Handling in NAnt
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NAnt was not designed as a robust platform for error handling. It does not have notions of such things as try-catch constructs, though it does have a basic idea of an On Error Goto construct, which may bring a tear to the eye of any VB 6 using reader. NAnt has two properties (which we discussed briefly in 2) that can be used to perform actions upon either a successful or failed execution of the build script. These properties are called nant.onsuccess and nant.onfailure, respectively. In terms of error handling, the property we are interested in is nant.onfailure. This property is set as follows: <property name="nant.onfailure" value="dosomething"/> The value dosomething must be a target of the same name in the current script, or the build script will not execute. Effectively, using this setting means that if the build script fails during execution, the target dosomething will be called before the failure is reported and
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execution stops. This gives you the opportunity to perform some corrective action or other similar activity, such as a mail task to notify someone of the error. You should be aware of some specific points about this property. Consider the following script: < xml version="1.0" encoding="utf-8" > <project name="ErrorHandlingExample" default="DoomedToFail"> <target name="DoomedToFail"> <property name="nant.onfailure" value="GiveUp"/> <fail message="This target is not going to work"/> </target> <target name="GiveUp"> <echo message="I give up, I really do."/> <call target="CleanUp1"/> <call target="CleanUp2"/> </target> <target name="CleanUp1"> <echo message="Doing CleanUp1..."/> <property name="nant.onfailure" value="CleanUp2"/> <fail/> </target> <target name="CleanUp2"> <echo message="Doing CleanUp2..."/> </target> </project> The target DoomedToFail makes use of the onfailure property to target GiveUp to perform corrective action. Immediately afterwards we call the <fail> task to throw a BuildException, which will cause the GiveUp target to be called. The GiveUp target is then used to call two corrective targets, CleanUp1 and CleanUp2. This is a legal use of the onfailure target. However, in CleanUp1 we then use the onfailure target again to target CleanUp2 (which will be called anyway by the GiveUp target). Then we cause CleanUp1 to fail. The CleanUp2 target is never called, though. This is because subsequent to the first failure, no other failure can be accounted for and execution halts immediately. It is not possible to chain error handling in any way. Therefore, it is important that the corrective steps that you require will not fail themselves, or otherwise the error handling is fairly pointless. The output of running the script is as follows: ---------- NAnt ---------NAnt 0.85 Copyright (C) 2001-2004 Gerry Shaw http://nant.sourceforge.net
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Buildfile: file:///ErrorHandlingExample.xml Target(s) specified: DoomedToFail DoomedToFail: GiveUp: [echo] I give up, I really do. CleanUp1: [echo] Doing CleanUp1... [call] ErrorHandlingExample.xml(20,7): [call] No message. BUILD FAILED - 1 non-fatal error(s), 0 warning(s) ErrorHandlingExample.xml(8,7): This target is not going to work Total time: 0 seconds. Output completed (1 sec consumed) - Normal Termination We can see in the output that following the second failure (in target CleanUp1) halts the script execution immediately; target CleanUp2 is never called. The net result of this is that there is some utility to the error handling in NAnt but not to the extent that it provides robust rollbacks, transaction reversals, and so on. We will see a suitable use of the onfailure property when we look at the testing part of the build script for the Transformer application in just a little while. So, after a pessimistic start to proceedings, let us move on to the real work.
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