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As discussed earlier, we are not considering at this point the differing environment possibilities, and so there is no work in this target: <target name="selectenvironments" description="Select environments"> <!--Enter tasks for selectenvironments target--> </target>
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Creating the environment is as simple as creating the directory as specified at the top of the script. We also append the specific version of the application as in this example we can have multiple side-by-side instances of the software: <target name="createenvironments" description="Create the environments required"> <delete dir="${core.environment}\${sys.version}\" failonerror="false"/> <mkdir dir="${core.environment}\${sys.version}\"/> </target>
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With the environment created, we can perform a copy of the assets into the environment. In this case there are very few assets of course. <target name="position" description="Place required assets"> <copy todir="${core.environment}\${sys.version}\"> <fileset basedir="${core.deploy}\${sys.version}"> <include name="**"/> </fileset> </copy> </target>
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CHAPTER 4 A SIMPLE CASE STUDY
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Under most scenarios we would expect to have to alter configuration in some way, but in this simple application there is nothing to do: <target name="configure" description="Amend configuration settings as necessary"> <!--Enter tasks for configure target--> </target>
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Once again, a straightforward message is sufficient: <target name="notify" description="Tell everyone of the success or failure."> <echo message="Notifying you of the deploy process success."/> </target>
fail
This target will also make do with a simple message: <target name="fail"> <echo message="Notifying you of a failure in the deploy process."/> </target>
help
We have added notes to the help target to assist with the execution of the script: <target name="help"> <echo message="The skeleton file for the deploy process is designed to execute the following targets in turn:"/> <echo message="-- selectversion"/> <echo message="-- get"/> <echo message="-- selectenvironments"/> <echo message="-- createenvironments"/> <echo message="-- position"/> <echo message="-- configure"/> <echo message="-- notify"/> <echo message="This file should be run with a Boolean value for 'debug'."/> <echo message="-- True indicates that no versioning be set (0.0.0.0)."/> <echo message="-- False indicates that a regular version be set(1.0.x.0)."/> <echo message="Example: -D:debug=true"/> <echo message="This file should be run with a version number for 'sys.version'."/> <echo message="-- If debug=true then the default will be used (0.0.0.0)."/> <echo message="Example: -D:sys.version=1.0.7.0"/> </target>
CHAPTER 4 A SIMPLE CASE STUDY
Examining the Output
So the current deployment script is not too complicated, we can execute the script with the following: nant -f:Transformer.Deploy.xml -D:debug=true go or with this: nant -f:Transformer.Deploy.xml -D:debug=false -D:sys.version=1.0.2.0 go Based on a debug run, we can see the following output: ---------- NAnt ---------NAnt 0.85 Copyright (C) 2001-2004 Gerry Shaw http://nant.sourceforge.net Buildfile: file:///Transformer.Deploy.xml Target(s) specified: go
selectversion:
get: [delete] Deleting directory 'D:\dotNetDelivery\TempDeploy\'. [mkdir] Creating directory 'D:\dotNetDelivery\TempDeploy\0.0.0.0\'. [copy] Copying 1 file to 'D:\dotNetdelivery\TempDeploy\'. [unzip] Unzipping 'D:\dotNetDelivery\TempDeploy\Transformer-Build-0.0.0.0.zip' to 'D:\TempDeploy\0.0.0.0\' (10379 bytes). selectenvironments:
createenvironments: [delete] Deleting directory 'D:\dotNetDelivery\Program Files\Transformer\0.0.0.0\'. [mkdir] Creating directory 'D:\dotNetDelivery\Program Files\Transformer\0.0.0.0\'. position: [copy] Copying 2 files to 'D:\dotNetDelivery\Program Files\Transformer\0.0.0.0\'.
CHAPTER 4 A SIMPLE CASE STUDY
configure:
notify: [echo] Notifying you of the deploy process success. go:
BUILD SUCCEEDED Total time: 5.6 seconds. Output completed (30 sec consumed) - Normal Termination Broadly speaking, not much happened. All we have really done here is unzip some assets to a directory. However, even with this limited interaction, you should be able to see that deployment could quickly become a problem once we have moved beyond pure .NET Windows applications. Once interaction with other systems, databases, multiple configurations, and the like are taken into account, we will have a tricky problem to solve. With that said, bear in mind that for simple utilities or tools, this deployment script might be perfectly adequate.
Note We will look at techniques for handling deployment complexity in the next chapter to some extent,
and also in the advanced chapters toward the end of the book.
Summary
We have walked through the creation of a build and deployment script in some depth. Although we have concentrated on a simple application, the same issues that arise for complex applications have appeared here in one form or another. We have refactored the original script to a small extent and considered where other gains through refactoring may be obtained as we progress. In addition, we have linked groups of tasks together to achieve our ends, and we discovered some of the limitations that we may need to tackle. In the next chapter we will complicate the scenario further, which will lead to refactoring of the code itself and a refactoring of the build files to gain further efficiencies.
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