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SCM (Source Control Management), also known as Version Control System (VCS), is software or a set of tools that helps developers track and control changes in a project's source code. SCM allows storing all versions of files, tracking who made changes and when, managing different versions of the project, and coordinating work among team members.
What is SCM for?
The main purpose of SCM is to provide a safe and reliable environment for working with source code and other project files. Using SCM allows:
Version control systems (SCM) provide several key functions for effective software development management. First, they allow tracking all changes in the code, saving each as a separate version. This creates the possibility of reverting to previous versions if needed, which is important for fixing bugs and maintaining project stability.
Secondly, SCM simplifies collaboration among developers, allowing them to work simultaneously on different parts of the code within a single project. This is achieved through the ability to work in parallel on different branches and subsequently merge changes, helping to reduce conflicts and streamline the integration process.
Furthermore, SCM supports project development by allowing the creation of branches for experimenting with new features or improvements without risking disruption to the main code. After successful testing, these branches can be merged with the main version, enabling the implementation of innovations without affecting the stability of the main codebase.
Finally, SCM ensures code security by offering tools for access control. This guarantees that only authorized users can make changes, helping to protect the code from unauthorized modifications and maintaining the integrity of the project.
Version control systems emerged from the need to organize and control the software development process. In the early years, developers manually created backups of their projects, which was a complicated and risky task. In the 1970s, the first centralized version control systems appeared, such as SCCS (Source Code Control System), which was created at Bell Labs in 1972, and RCS (Revision Control System), developed in 1982.
These systems provided version control but were limited in capabilities for teamwork. In the 2000s, distributed version control systems emerged, such as Git, which provided developers with greater flexibility and the ability to collaborate effectively on large projects.
Popular SCM systems and services
- Git — the most widely used distributed version control system, commonly used for projects of various scales. Due to its flexibility and efficiency, Git has become the standard in the software world. It is supported by popular platforms such as GitHub, GitLab, and Bitbucket.
- Subversion (SVN) — a centralized version control system that was one of the most popular before the emergence of Git. SVN is still used in many companies, especially where centralized control over the code is required.
- Mercurial — a distributed version control system similar to Git but focused on simplicity and stability. Mercurial has often been used in projects where a simple alternative to Git is needed.
- Perforce — an enterprise version control system often used in game and software development, where high performance and the ability to work with large files are important.
- Azure DevOps (TFVC) — a platform from Microsoft that includes a centralized version control system TFVC (Team Foundation Version Control), which integrates with other development tools such as CI/CD, project planning, and test automation.
SCM systems are critically important for the modern software development process, ensuring the preservation and tracking of code, supporting collaboration, and enhancing the quality of the final product.
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