Version Control with Subversion: Next Generation Open Source Version Control

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As you may have guessed from the layout of this page, we are quite pleased that some versions of this book have been published by O'Reilly Media. You can certainly buy a traditionally published print copy of the book if you'd like to, but you'll always find the most recent versions here on this site, available in both HTML and PDF formats. Versions of this book use a numbering system designed to match those used by the Subversion software itself—version 1.

Version control tutorial: Branching and merging -

Here are the latest versions of the book which are available online:. Please bear in mind that these versions are works-in-progress: if you bookmark or link to specific sections, those links may be invalidated by continuing development. If you need a link that can be reasonably expected to remain stable for years to come, link to one of the completed editions above. You can also find older versions of the book which we suspect are no longer of much interest to most folks here. For feedback on the book or this website, contact svnbook-dev red-bean. If you have spotted errors in the book O'Reilly's hardcopy or otherwise , please do the following things:.

Reports of errors in the book are always welcome. Reports of errors in the book which are accompanied by a suggested fix for the problem are even better.

Version control concepts

For technical fixes spelling, grammar, markup, etc. Whenever a new project is hosted on Tuleap, a new Subversion repository is automatically created and properly initialized. Each project has its own Subversion repository as opposed to what happens in most Subversion servers, where several projects share the same repository. Having its own repository has a certain number of advantages: the Subversion logs, history files, and all administrative files e. This allows you to fully customize the behavior of Subversion for a given project without impacting the others.

All interactions with a Subversion repository should normally happen through a Subversion client. However if need be and if this feature is available on your Tuleap server, you can get access to your Subversion repository via your Tuleap shell account see Shell Account.

Use open source Subversion for personal document management - TechRepublic

When a new Tuleap project is created, it comes with a virgin subversion repository that the project team must populate. Due to the fact that Subversion manages branching and tagging through its virtual filesystem and not through labels attached to individual files as in CVS there is a recommended way to organize your repository. The layout suggested below can be considered as a de-facto standard and we highly recommend that you follow this best practice. If you expect your Tuleap project to manage only one project deliverable then you can create the following top-level directories in your repository:.

If you expect your Tuleap project to manage several software deliverables that are managed independently one from each other, then it is often a good idea to first create top-level directories that carry the name of the sub-project and under each of these directories repeat the same structure as above. Assuming you have two subprojects named engine and client , the initial layout of your repository should look like this:. More on the repository layout is available in the Subversion book listed in Subversion References.

Tuleap offers a number a facilities that allow you to interact with your Subversion repository through the Web interface. The Subversion Web interface does not intend to replace the Subversion client that you should normally use on your desktop computer.

Version Control with Subversion

It rather focuses on providing you with additional features not found in Subversion clients. The Subversion Web interface provides the following features to end-users:. In order to interact with the Subversion repository of any Tuleap-hosted project, you normally need to have Subversion installed on your machine. However Tuleap also offers a built-in Web browsing interface to the Subversion repository which allows you to navigate in the source code, download it, view a file history or compare two revisions of the same file.

Browsing the Subversion repository - A sample session. If a project has the Subversion Tracking feature activated see Subversion Administration Interface , the Subversion Web interface will bring very useful features to the software engineers:. Atomic Subversion commit and unique commit ID : all changes file modification, addition or removal that are committed in one go from your Subversion client are assigned a unique commit ID also known as a Subversion revision number. Any reference of that kind will be automatically transformed into an hyperlink to the Subversion tracking database.

This mechanism makes it very easy to go from project artifacts like bugs, support requests or tasks to source code changes and vice-versa more on this mechanism at Cross-Referencing Artifacts and Subversion Commits. Commit search : another side benefit of the Subversion Tracking database is that you can use various search criteria to query the Subversion tracking database. You can search code changes by authors who made the change , by revision number, by file path or by keywords to be found in the log message.

Results can also be sorted by clicking on the headers of the search results see Querying the Subversion tracking database of a given project.

Installing Git

A click on one of the selected commit ID brings you to a complete description of the change, the files that were impacted and the nature of the change with a direct link into the Subversion repository if you want to browse the file or look at the code modification see The detail of an atomic Subversion commit. Querying the Subversion tracking database of a given project. While working in the development or the maintenance phase of a software project, it is vital to keep track of the changes made to the source code.

This is what Version Control systems like Subversion do. In addition to keeping track of the source code change history it is often critical to relate the changes to the artifact a task, a defect or a support request that led the developers to make a change in the code. And conversely, when reading the artifact description it is also very helpful to immediately see how the change was implemented. The integration of Subversion in Tuleap precisely provides Tuleap users with this bi-directional cross-referencing mechanism.

This is achieved through the use of reference patterns that are automatically detected by Tuleap in either the follow-up comments of the project artifacts or in the messages attached to a Subversion commit. When browsing a message containing this pattern anywhere in Tuleap, the pattern will be automatically transformed into an hyperlink to the artifact description.

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When browsing a message containing this pattern anywhere in Tuleap, the pattern will be automatically transformed into an hyperlink to the commit description which include log messages, impacted files, versions and author of the change see The detail of an atomic Subversion commit. The Tuleap reference mechanism allows cross-referencing with any Tuleap object: artifacts, documents, files, etc. Please refer to Reference Overview for more details on References. It is considered a best practice to always reference a bug, a task or a support request in any of the log message attached to a Subversion commit.

Similarly when closing the related artifact task, bug,etc. You will find this extremely convenient while trying to keep track of the changes and why they were made. Through the Tuleap Web interface, project administrators can perform the most common administration and configuration tasks on their Subversion repository. The administration functions can be accessed through the SVN Admin menu item in the Subversion menu bar. Subversion Tracking : Being a version control system Subversion is, of course, natively taking care of all your file history and is able to tell you what changes were made by whom and at what date.

The file history is something you can look at either through your Subversion client or through the Subversion Web Browsing interface. If you activate the Subversion tracking default for your project Tuleap will also keep track of all the code changes in the Tuleap database.

This will give you extra capabilities on your Subversion repository as explained in Querying Subversion. Subversion Preamble : In some cases e. In this case, the Subversion information displayed in the welcome page of the Tuleap Subversion service are inadequate. Fortunately, the project administrator can customize the Subversion Information page here. Subversion access permission depends upon the project status private or public and the class of citizen a user belongs to see Type of users. Regarding private projects, only project members have access to the Subversion repository. By default they all have read and write access.

This can be modified by customizing access permissions as explained below. Anonymous Users : users who have not registered with Tuleap or are not logged in have no access at all to the Subversion repositories. Registered Users : have read-only access to Subversion repositories. In other words they can checkout a working copy of the software but they are not allowed to commit any changes they have made to the source code. Source code contributions bug fix, enhancements… from this class of user must return to the project team via the Patch Tracker see?

Note : all source code accesses are recorded by Tuleap.

Project administrators always have access to the list of people who accessed the source code see Access Logs. As mentioned above in the section about private projects, it is also possible to grant read-only access to the project members. Thanks to the integration of Subversion in the Tuleap environment, project administrators can redefine access permissions for some or all Tuleap users. This can be achieved by specifying access permission rules that will complement or even override the default settings. The syntax of the access permission rules follows the following pattern:.

If it is a group name it must be preceded with the character. To define groups of users use the following block statement:. All project defined user groups see User Groups are also defined in the Tuleap default permissions settings and ready to use if you wish to redefine access permissions. As an illustration, the default permission settings of a Tuleap repository as explained in the previous section are expressed through the following set of rules:.

Note that if the user group is not defined neither in the default permission settings nor defined by the user, each permission definition for that group will be commented. Attributing permissions to a specific user or to manually defined groups could cause security issues.

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