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Revision 34 as of 2006-02-27 13:31:15
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/!\ This chart is a rough draft /!\ There was a comparison of version control systems here, but it was of limited use and has been removed. See instead the [[Bzr]] feature list.
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This page is a user-oriented comparison of different revision control system. For a more technical comparison, see ["RCSChoices"]. See also ["SCMComparisons"] (note: this may be better to move the content of this page here) for a brief presentation of each system and how they compare to Bazaar-NG in particular. The determination on this chart is based upon the core installation and features that are already working in devel.

= Overview =

||RCS Name ||Bazaar-NG||Arch||CVS ||Subversion ||Git ||Hg ||Monotone||Darcs||
||Decentralized ||Yes ||Yes ||No ||No [#3 (3)]||Yes ||Yes||Yes ||Yes ||
||Disconnected Ops ||Yes ||Yes ||No ||No ||Yes ||Yes||Yes ||Yes ||
||Simple Namespace ||Yes ||No ||No ||Yes ||No ||No ||No ||Yes ||
||Supports Renames ||Yes ||Yes ||No ||Yes ||Yes[#2 (2)]||Yes[#1 (1)]||Yes ||Yes ||
||Needs Repository ||No ||Yes ||Yes ||Yes || || || || ||
||Checkouts ||Yes ||No ||Yes ||Yes || || || ||No ||
||Atomic Commit ||Yes ||Yes ||No ||Yes || || || || ||
||[:Merge:Smart Merge] ||Yes ||Yes ||No ||No ||No? || ||Yes ||Yes ||
||[:CherryPick:Cherrypicks] ||Yes ||Yes ||Yes ||Yes || ||Yes||Somewhat[#5 (5)]||Yes ||
||[:BzrPlugins:Plugins] ||Yes ||No ||No || || || || || ||
||Has Special Server ||No ||No ||Yes ||Yes || || || || ||
||Req. Dedicated Server||No ||No ||Remote||Remote ||No ||No ||No ||Yes ||
||Good Windows support ||Yes ||No ||Yes ||Yes ||No[#4 (4)]||Yes|| || ||

= Details about each feature =

== Decentralized ==
Whether the tool is designed to allow [:Branch:branches] of the same project to be in different remote [:Repository:repositories].

== Simple Namespace ==
The namespace is the way the RCS communicates with the user the various resources for the RCS such as the names for branches and the names for [:Revision:revisions] that are [:Merge:merge]. For example: requiring the user to refer to revisions with base-16 numbers is not considered "simple" in this document.

== Needs Repository ==
Some revision control systems require that branches be aggregated into [:Repository:repositories].

== Supports Renames ==
If a user can rename a file in the RCS without loosing the RCS history for a file, then renames are considered supported. If the operation resultes in a delete/add (aka "DA pair"), then renames are not considered supported.

== Has Checkouts ==
A ["Checkout"] is a [:WorkingTree:working tree] that points elsewhere for its RCS data.

== Atomic Commit ==
Does the RCS track which files were associated with which [:Commit:commit].

== Smart Merge ==
Whether the tool is able to know which revisions have to be merged (recording [:Merge:merge] history is a necessary condition for this).

== Cherrypicks ==
Whether the tool allows CherryPick (fine-grained selection of revisions to be merged).

== Plugins ==
Whether the tool is extensible with plugins. Our plugins are on the BzrPlugins page.

== Can use standard fileserver ==
Whether the tool can work with a standard file server (HTTP for read-only operations, ftp/sftp/webdav or others for write operations). This allows you to host a repository on almost any internet service provider without dedicated support.

== Work on partial checkout ==
Whether a user can checkout only a subdirectory of a project and work on it.

== Windows support ==
Whether the Microsoft Windows platform is well supported.

= Footnotes =

[[Anchor(1)]] 1. Support for renames in hg is being implemented. Unlike bzr, it uses rename history instead of unique file ID.

[[Anchor(2)]] 2. Git has a very particular management of renames. It does not track renames at commit time at all. However, it "guesses" them at merge time. Since it uses hashes, it can immediately see renames without modifications, and otherwise, it has to use a heuristic to find the file with the closest content. Linus claims that this is the best model, while other find it completely broken. See for example [http://www.mail-archive.com/git@vger.kernel.org/msg03711.html this post].

[[Anchor(3)]] 3. Subversion is surely not a decentralized revision control system (see for example [http://subversion.tigris.org/subversion-linus.html this page] if you're not convinced). However, [http://svk.elixus.org/ svk] is built on top of subversion and is a decentralized revision control system.

[[Anchor(4)]] 4. Can be made to work on cygwin, but with poor performance.
See also [[http://en.wikipedia.org/wiki/Comparison_of_revision_control_software|Comparison of Revision Control Software]] on wikipedia for another relatively complete comparison.

There was a comparison of version control systems here, but it was of limited use and has been removed. See instead the Bzr feature list.

See also Comparison of Revision Control Software on wikipedia for another relatively complete comparison.