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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.
= Overview =
||RCS Name ||Bazaar-NG||Arch||CVS||Subversion||Git ||Hg ||Monotone || Darcs ||
||Decentralized || Yes ||Yes ||No ||No[#3 (3)]||Yes ||Yes ||Yes ||Yes ||
||Simple/No Namespace||Yes ||No ||No ||Yes || ||No ||No ||Yes ||
||Supports Renames || Yes ||Yes ||No ||Yes ||Yes[#2 (2)]||No[#1 (1)]||Yes ||Yes ||
||Optional Repository||None ||Req ||Req||Req || || || || ||
||Has standalone branches||Yes||No ||No ||No ||Yes? ||Yes || ||Yes ||
||Has Checkouts || Yes ||Yes ||Yes||Yes || || || ||No ||
||Has Revisions || Yes ||Yes ||No ||Yes || || || || ||
||Smart Merge || Yes ||Yes ||No ||No ||No? || ||Yes ||Yes ||
||Cherrypicks || Yes ||Yes ||Yes||Yes || ||Yes || ||Yes ||
||Plugins || Yes ||No ||No || || || || || ||
||Can use standard fileserver||Yes||Yes||No||No || ||Somewhat || ||Yes ||
||Can work over email || Planned||No||No ||No || || || ||Yes ||
(note: it would be interesting to have a small benchmark too, like "time to run XXX diff/import/commit in the linux kernel",)
= Details about each feature =
== Decentralized ==
Whether the tool is designed to allow branches of the same project to be in different remote repositories.
== Simple/No Namespace ==
The namespace is the way a revision control system identifies a revision uniquely. It can be user-visible (GNU Arch), or tool internal (bzr, git, ...).
== Optional Repository ==
What does "req" mean?
== Supports Renames ==
Whether the tool supports file renaming and merging changes to a renamed file.
== Has Checkouts ==
A [Checkout checkout] is a working tree with a relatively small amount of metadata.
== Has Revisions ==
== Has standalone branches ==
A StandaloneBranch is a directory containing both a working tree and the history.
== Smart Merge ==
Whether the tool is able to know which revisions have to be merged (recording 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. See BzrPlugins for the case of bzr.
== 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.
== Can work over email ==
Whether the tool can easily work over email. This is usefull for example for an occasional contribution to a project, without having to publish a branch. See SubmitByMail.
= 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://email@example.com/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.
|See also [[http://en.wikipedia.org/wiki/Comparison_of_revision_control_software|Comparison of Revision Control Software]] on wikipedia for another relatively complete comparison.|