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As I mentioned earlier, I use Visual SourceSafe (VSS) in my current role and therefore have much greater experience with VSS than any other source control system. The set of tasks here describe the commands that we can use for VSS, but there are similar tasks for other source control systems in NAnt and NAntContrib. In particular, NAnt and NAntContrib provide tasks analogous to those described here for CVS, Subversion, StarTeam, and other software configuration management systems.
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<vssget> [NAntContrib]
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This is the first VSS task we will use. It obtains the source code from the VSS database, which is the first step in the proposed build process. As you can see, the task is relatively self-explanatory; in fact, all of the VSS tasks are structured in the same way. The following example shows a straightforward get of some source code: < xml version="1.0" > <project> <vssget user="builder" password="builder" localpath="D:\SourceCode" recursive="true" replace="true" dbpath="D:\VSS\srcsafe.ini" path="$/MySolution/" /> </project> In this instance, the user builder needs only read-only access to the VSS database.
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<vsscheckin> [NAntContrib] and <vsscheckout> [NAntContrib]
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Although we will make less use of these tasks, they do have their place. Say we want to maintain a copy of the latest database schema for a system as part of the build process. In this case, we may want to check out, regenerate, and check in a file containing the schema. The checkin part of this would look like the following; you can see the similarity to the previous task: < xml version="1.0" > <project> <vsscheckin user="builder" password="builder" localpath="D:\SourceCode\DB-Create.sql" recursive="false" dbpath="D:\VSS\srcsafe.ini" path="$/MySolution/DB-Create.sql" /> </project> In this instance, the user builder needs write access to the VSS database.
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<vsslabel> [NAntContrib]
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As part of our efforts to provide versioning for a system, the <vsslabel> task lets us handle the source control side of the problem. A labeling task implementation may look like this: < xml version="1.0" > <project> <vsslabel user="builder"
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password="builder" dbpath="D:\VSS\srcsafe.ini" path="$/" comment="Automated Label" label="v1.0.0.0" /> </project>
<vssundocheckout> [NAntContrib]
As you might recall from our earlier discussion of database scripts, in the event of a failure during the generation of the database script, the consequence for the system is that the DB-Create.sql file will remain checked out in VSS, which in turn means that all subsequent attempts to execute the build file will result in an error since the <vsscheckout> task will fail. To recover from this, we can use the <vssundocheckout> task to restore the state and try once more.
Special NAnt Tasks
Apart from tasks, NAnt has a couple of other ways of performing actions inside a build script. These methods open up further options for handling certain aspects of the build process.
NAnt Functions
First, NAnt comes with a built-in set of functions to be used in build scripts. We came across an example of a function call in the <ifnot> task example earlier in this chapter. NAnt functions cover a variety of areas, such as date- and time-, folder- and file-, environmental-, and NAnt-specific functions. There are many functions, and the list continues to grow. Table 3-3 shows the list of functions available under the file category. Table 3-3. NAnt File Functions
Function
file::exists file::get-creation-time file::get-last-access-time file::get-last-write-time file::get-length file::is-assembly file::up-to-date
Description
Determines whether the specified file exists Returns the creation time and date of the specified file Returns the date and time the specified file was last accessed Returns the date and time the specified file was last written to Gets the length of the file Checks if a given file is an assembly Determines whether targetFile is as up-to-date (or more current) than sourceFile
These functions can be used to perform tests as shown in the <ifnot> example, or perhaps to perform tests on the if and unless attributes of properties and tasks. The functions help us carry out decision-making and conditional processing within a NAnt script.
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