Because this occurs on their local machine, it has no impact on other members of the team. When a developer is ready to store a set of changes, they commit those changes to their local repository. The developer who creates the clone receives the current version of all tracked files in the working directory along with the project’s complete version history in the local repository. The two developers can then begin collaborating on the project from the same starting point. For example, with appropriate authorization one developer can create a clone (an exact copy) of another team member’s repository. In a DVCS, collaboration among members of a team is facilitated by the ability for developers to interact with one another’s repositories. The concept of a local repository give rise to one of the best features of a DVCS, even for the solo developer: it’s fast! Because commits and other interactions with the local repository take place on the local machine at hard drive speeds, there is no latency or dependency on a connection to a remote repository. For VFP developers, the working directory is the project folder. The working directory is simply the name given to the set of folders and files with which the developer directly interacts during the development process. Along with the local repository is the concept of the working directory, sometimes also referred to as the working copy. Instead, each developer has their own local repository that resides on their own local machine. In contrast, a distributed version control system (DVCS) does not require a central repository. While this type of version control can be useful, the need to lock files often creates bottlenecks for team development.įigure 1: A centralized version control system features a single central repository shared by all members of the development team. Other developers cannot check out the same file until the first developer checks it back in. The checkout process creates (or updates) a copy of the file on the developer’s local machine, and marks the file as locked in the central repository. In order to work on a file, a developer must check it out from the central repository. As its name implies, a centralized version control system (CVCS) has a single central repository that is shared by all developers working on the project. There are two distinct types of version control systems, centralized and distributed. While different version control systems may use different physical forms for their repository-be it file-based, a database, or whatever- conceptually it’s always the same thing. You can think of a repository as a kind of filing cabinet where the records of changes are kept. The repository is the location where the VCS stores the information it uses to track the changes to a project’s files over time. 59ĭistributed Version Control System Concepts All version control systems (VCS) have in common the concept of a repository. 58 Downloads for Mercurial and TortoiseHg. 44 Tips, tricks, and advanced techniques. 44 Use descriptive messages with every commit. 43 Field notes from working with Mercurial. 40 Step 4 – Add files and do the initial commit. 37 Step 2 – Enter your configuration settings. 36 Integrating Mercurial into your daily development workflow. 36 Integration with the VFP project manager. 15 Branching and merging within a repository. 4 Installing Mercurial and TortoiseHg on Windows. 2 Distributed Version Control System Concepts. © 2011 Rick Borup of 59 VFP Version Control with Mercurial Come to this session and learn how to integrate Mercurial into your daily VFP development workflow. Together with the TotoiseHg shell program for Windows, Mercurial offers VFP developers a powerful tool for managing their version control requirements. While distributed version control systems are based on a decentralized model designed to facilitate team software development, they are also useful for the independent developer who's working solo. Mercurial is a distributed version control system (DVCS) well suited for use with Visual FoxPro application development. Rick Borup Information Technology Associates 701 Devonshire Dr, Suite 127 Champaign, IL 61820 Voice: (217) 359-0918 Email: This paper was originally presented at the Southwest Fox conference in Gilbert, Arizona in October, 2011.
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