https://DevOpsCloud.io -- Cloud Monk Losang Jinpa, Ph.D., MCSE/MCT, GitOps DevOps Engineer

Version control

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“To have an effective DevOps pipeline, it is important to have a single system of truth to understand what bits and bytes are being deployed into production. For most systems this starts with a source code management system that contains all of the source code that gets compiled and built into the production deployment. By tracing a production deployment back to a specific revision in source control, you can do root cause analysis of bugs, security holes, and performance issues.” (DvOpJava 2022)

Snippet from Wikipedia: Version control: Version control (also known as revision control, source control, and source code management) is the software engineering practice of controlling, organizing, and tracking different versions in history of computer files; primarily source code text files, but generally any type of file.
Version control is a component of software configuration management.
A version control system is a software tool that automates version control. Alternatively, version control is embedded as a feature of some systems such as word processors, spreadsheets, collaborative web docs, and content management systems, e.g., Wikipedia's page history.
Version control includes viewing old versions and enables reverting a file to a previous version.

Creative Commons Attribution-Share Alike 4.0

“A component of software configuration management, version control, also known as revision control or source control, is the management of changes to documents, computer programs, large web sites, and other collections of information. Changes are usually identified by a number or letter code, termed the “revision number”, “revision level”, or simply “revision”. For example, an initial set of files is “revision 1”. When the first change is made, the resulting set is “revision 2”, and so on. Each revision is associated with a timestamp and the person making the change. Revisions can be compared, restored, and with some types of files, merged.”

Fair Use Source: https://en.wikipedia.org/wiki/Source_control_management

Version control systems (VCS)

Source-management models

Atomic commit
File locking - simplest method of preventing “concurrent access” problems involves locking files so that only one developer at a time has write access to the central “repository” copies of those files. Once one developer “checks out” a file, others can read that file, but no one else may change that file until that developer “checks in” the updated version (or cancels the checkout).
Version merging or Merge (revision control)