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USING SOFTWARE CONFIGURATION MANAGEMENT TASKS
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SCM is the foundation to any successful software project. We expect that you are using some form of SCM to look after your code, as any software professional should. Ant happily works with most SCM systems, and can coexist with any of them. There are a multitude of optional tasks that enable you to make calls to your SCM system from inside Ant. These tasks let you check in and check out code, sometimes even to add labels. The exact set of services available depends upon the particular SCM tool in use: each tool has a unique set of corresponding Ant tasks. At the time of writing, Ant supports these SCM tools: CVS, Perforce, ClearCase, SourceSafe, SourceOffsite, StarTeam, Merant PVCS, and Continuus. Each has its own tasks and its own set of operations. Table 10.2 lists the core set of corresponding Ant tasks.
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Table 10.2 Ant-supported SCM systems and the core actions supported by Ant s tasks. update <cvs command= "update"> <ccupdate>
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SCM System CVS ClearCase Continuus PVCS SourceSafe SourceOffSite StarTeam Perforce
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check out <cvs command= "checkout"> <cccheckout> <ccmcheckout>
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check in <cvs command= "commit"> <cccheckin> <ccmcheckin>
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label <cvs command= "label">
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<pvcs> <vssget> <sosget>
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<vsscheckout> <soscheckout> <stcheckout> <p4edit>
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<vsscheckin> <soscheckin> <stcheckin> <p4submit>
<vsslabel> <soslabel> <stlabel> <p4label>
<p4sync>
All the tasks need some external support to run. Except for StarTeam, all rely on a native executable on the path, such as cvs, p4, and cleartool. The StarTeam tasks use a Java library supplied by the vendor, which must be dropped into the ANT_HOME\lib directory. All of the SCM tasks, except for the <cvs> task, are optional tasks. Ironically, and perhaps understandably because of its popularity, the <cvs> task is a built-in task, although it does require the CVS command-line executable to be available. The rest of this section briefly touches on a few of these SCM tasks, noting any issues that we are aware of. 10.3.1 CVS During the development of this book, we used a CVS server as our repository for source and the book s chapters themselves. Our automated builds that were developed for the CruiseControl section of chapter 16 required that we update our build machine from our SCM. The code to do this uses one <cvs> task, as shown here: 245
USING SOFTWARE CONFIGURATION MANAGEMENT TASKS
<property <property <property <property
name="root.dir" location="${env.TEMP}"/> name="cvs.username" value="${user.name}"/> name="cvs.host" value="localhost"/> name="cvs.root" value=":pserver:${cvs.username}@${cvs.host}:/home/cvs/projects"/> <property name="cvs.passfile" value="../.cvspass"/> <property name="cvs.dir" location="${root.dir}"/> <property name="cvs.package" value="AntBook/app"/> <cvs cvsRoot="${cvs.root}" command="checkout" dest="${root.dir}" package="${cvs.package}" passfile="${cvs.passfile}" failonerror="yes" />
The important things to note are that we use a temporary directory for our continuous builds (we use the environment s TEMP directory) and that we set failonerror to ensure that a <cvs> failure is fatal, which is not the default. Generating change reports from a CVS repository Ant 1.5 adds two nice core tasks that work with CVS repositories: <cvschangelog> and <cvstagdiff>. The <cvschangelog> task generates an XML file containing all the changes that have occurred within a specified date range on CVS modules. The <cvstagdiff> task generates an XML file containing the differences between two CVS tags. Pleasantly, Ant ships with the Extensible Stylesheet Language (XSL) files changelog.xsl and tagdiff.xsl, both in ANT_HOME/etc, which turn these XML files into attractive hypertext markup language (HTML) reports. Refer to Ant s documentation for more details on these tasks, but we leave you with an example of how to generate a report from a CVS change log:
<cvschangelog destfile="changelog.xml"/> <xslt in="changelog.xml" out="changelog.html" style="${ant.home}/etc/changelog.xsl"> <param name="title" expression="AntBook ChangeLog"/> <param name="module" expression="AntBook"/> </xslt>
13 covers the <xslt> task in more detail. 10.3.2 ClearCase Although you can check files out, the current tasks don t follow the strict application of the Rational process, in which you have to name a particular task or defect related to the check out. Nor is there any method by which to label files from Ant, which is a feature desperately needed for completely automated deployment. We have encountered odd behavior when, after an ant clean deleted the build and dist directories in a ClearCase file system, Ant could not build again until the system was rebooted. If you encounter the same problem, try the same solution.
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