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CVS attempts to foster collaboration by providing developers access to all files in the repository. Each developer checks out a copy of the repository to a local workspace. All changes are made and unit-tested in the workspace. When changes are applied to the repository, the file version is incremented. A version history is maintained.
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CHAPTER 2 ECLIPSE
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CVS doesn t require files to be locked in order to change them. It allows multiple developers to work on the same file in their local workspace. When multiple developers make changes to the same file, CVS handles the merging of those files.
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Understanding the basic CVS commands for authentication, checking out, committing, updating, and comparing is fundamental to the basic usage of any CVS client application. A CVS repository is a collection of intellectual property that requires restricted access. In the case of open source projects, the repository is available for anyone to view. However, security is used to determine who is authorized to make changes directly to the repository. The CVS login command is used to authenticate users through username and password verification.
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Note CVS authentication doesn t protect files from being viewed during file transfers over the Internet.
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SSH should be used to protect file transfers in sensitive repositories.
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The checkout command may be the most confusing of all CVS commands because it doesn t have the same meaning as it does in other version-control software (VCS) applications. In CVS, the checkout command is used to get an initial local copy of the module from the CVS repository Some other VCS programs require files to be locked and refer to this process as checking out, which causes the confusion. After the local copy of the source has been modified and unit-tested, it must be submitted back to the repository. The commit command is used to apply the local changes or new files to the repository. The commit command should also be accompanied by a short explanation of the change. The explanation becomes associated with the version change for auditing and communication purposes. The update command is used to synchronize the local copy with the current version in the repository. This means that files committed to CVS by other members of the development team will replace the local files. Files that have been modified locally will be noted as modified and may require merging. It s a good idea to update on a daily basis and prior to running a final unit test and commit. Some clients have a query update that identifies the differences between the local copy and the remote server version. CVS provides the diff command to compare files. You can use the diff command to compare local files with those in the repository. You can also use it to identify differences between versions of the same file.
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Like many of the Eclipse features, CVS integration is implemented as a perspective. To display the CVS perspective, select Window Open Perspective Other, which will bring up the Select Perspective dialog from where you can select the CVS Repository Exploring perspective as shown in Figure 2-19.
CHAPTER 2 ECLIPSE
Figure 2-19. Switching perspectives The companion project to the book, the TechConf application, is hosted in the java.net community site under http://techconf.dev.java.net. To gain guest access to the code we first need to add the java.net CVS repository. Instructions on how to connect are available at http://techconf.dev.java.net/servlets/ProjectSource. To add a CVS repository, right-click on the CVS Repositories view and select New Repository Location, which will bring up the Add CVS Repository dialog as shown in Figure 2-20.
Figure 2-20. Adding a CVS repository
CHAPTER 2 ECLIPSE
The CVS server or host for java.net is cvs.dev.java.net, the repository path is /cvs. For anonymous access, the user is guest with a blank password. Like most CVS servers, the connection type is pserver using the default port. After entering all the required connection information as shown in Figure 2-20, click Finish. The new CVS repository should now be available under the CVS Repositories view. Expanding the new repository node reveals Branches, HEAD, and Versions nodes. Next, expand the HEAD node and locate the techconf module. You can use the HEAD node to check out and create a new Eclipse project. After you expand the HEAD node and locate the desired module from the list of available modules, right-clicking the module reveals the Check Out as Project and the Check Out As options. The Check Out as Project option automatically checks the module out to the Eclipse workspace. If an alternative location is required, use the Check Out As option. Either option will copy the files from the CVS repository, create a project, and add the project to the Navigator. To check out the module as a project in the Eclipse workspace, right-click on the node and select Check Out As, which will bring up the Check Out As dialog. Select Check out as a project in the workspace and click Finish. Once the project is added to the Navigator, the CVS commands are available as a submenu on the Team context menu. You can update the project by rightclicking the project in the Navigator and choosing Team Update. After all the files in the repository have been retrieved, you should have your own local copy of the TechConf project. To gain read/write access to the project, as with most projects, it is expected that you submit patches first, and based on merit the project s leads will grant you a developer role. Having access to a project s source code is one of the most compelling reasons for using open source. Although most projects provide source bundles in either ZIP or TAR formats, you can gain insight into the project s direction and allow for contribution if you have access to the current source code. If you re familiar with a CVS client, then you know that commands and architecture are necessary for interacting with CVS repositories. Although CVS is the prevailing version control system, there are other very popular systems available. In the open source category, a system that s winning many converts is Subversion, which is touted as the most likely replacement for CVS on most large open source projects. There are plug-ins for Subversion, and for most of the other open source and commercial version control systems, and most are modeled after CVS plug-ins, which should make for an easy transition.
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