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Comparison of version control software
The following is a comparison of version control software. The following tables include general and technical information on notable version control and software configuration management (SCM) software. For SCM software not suitable for source code, see Comparison of open source configuration management software.
== General information ==
"Repository model" describes the relationship between various copies of the source code repository. In a client–server model, users access a master repository via a client; typically, their local machines hold only a working copy of a project tree. Changes in one working copy must be committed to the master repository before they are propagated to other users. In a distributed model, repositories act as peers, and users typically have a local repository with version history available, in addition to their working copies.
"Concurrency model" describes how changes to the working copy are managed to prevent simultaneous edits from causing nonsensical data in the repository. In a ''lock'' model, changes are disallowed until the user requests and receives an exclusive lock on the file from the master repository. In a ''merge'' model, users may freely edit files, but are informed of possible conflicts upon checking their changes into the repository, whereupon the version control system may merge changes on both sides, or let the user decide when conflicts arise. Note that distributed version control almost always implies a merge concurrency model.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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