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 * The HgSubversion Mercurial extension. Read about it in its own page on this wiki.

Converting Repositories

Your first option should probably be the ConvertExtension bundled with Mercurial. It supports branches, incremental imports, and a few other nice features, and is maintained by the Mercurial authors. It currently only understands CVS, Subversion, Git, Darcs, Monotone, Bazaar, GNU Arch, Perforce and Mercurial as source formats and Mercurial and Subversion as destination formats.

Otherwise, the following tools may be useful.

1. Arch / TLA / Baz 1.5

2. Bazaar?

3. ClearCase

4. RCS

Convert to CVS (see ConvertExtension#Converting_from_RCS) and then use CVS tools.

5. CVS

Multiple convertors exist for converting from CVS to Mercurial:

Note: Mercurial's ConvertExtension uses a naive algorithm to understand CVS. If your CVS repository contains no tags and no branches, it'll work just fine. If you, and everyone who has ever used your CVS repository, have always tagged/branched the tip of your entire source tree, it should work just fine. But if you have ever played any funny games with tagging or branching, ConvertExtension will not work. It doesn't even try to handle those cases because it is based on cvs2ps, which doesn't even try to understand the full range of strange things people do with CVS tags/branches. The only tool known to handle all of CVS' weird corner cases is cvs2svn. Luckily, there is now a version of cvs2svn with a native Mercurial backend called cvs2hg. See its README.cvs2hg file for more information.

In the past, other options have included:

  • use cvs2svn to convert to Subversion, then ConvertExtension to import the Subversion repository: cvs2hg is faster and more flexible

  • use cvs2git to convert to git fast-import format, then use FastImportExtension to import that: again, cvs2hg is faster and more flexible

You can also convert from Mercurial to CVS:

6. Darcs

  • The ConvertExtension supports Darcs.

  • An older sample Darcs conversion script is available in the contrib/ directory of the Mercurial source.
  • Also see Tailor.

7. Git

See GitConversion (incremental).

8. Subversion

The ConvertExtension included in Mercurial 0.9.5 can import Subversion trees. It uses the Subversion API, so it can speak any Subversion repository access protocol.

Examples and details about Subversion interoperability can be found in WorkingWithSubversion.

Converters that work on local repositories or data (faster, if this is an option for you):

Converters that work on remote repositories:

Syncing tools:

  • hgsvn allows you to work on SVN checkouts using Mercurial (mirroring all SVN history in a local Mercurial repository on which you can also do local development). It is useful for managing private branches, submitting patches to project maintainers, have fast local operations instead of slow remote "svn up/log/blame", etc. Also useful as "one-shot" conversion tool if you just remove all the svn directories ("find . -name '.svn' |xargs rm -r") afterwards.

  • SubversionToMercurialSync (like hgsvn, but more primitive)

  • The HgSubversion Mercurial extension. Read about it in its own page on this wiki.

9. Perforce

The ConvertExtension supports conversion from Perforce since version 1.2.

The Perfarce extension allows you to pull changelists from Perforce, and to push Mercurial changesets back to it.

There is also a stand-alone script p4_to_hg This utility can actually keep two repositories in sync.

Currently, it's slapped together and built to serve my particular needs, but it could probably be modified into something more general. It currently makes no attempt to do anything with Perforce's ability to track branches or the movement of changesets from branch to branch. -- EricHopper 2005-09-27 06:31:03

See also posting http://selenic.com/pipermail/mercurial/2008-July/020241.html: "Start of Mercurial git-fast-import importer (was p4 to hg)" by Paul Crowley

See also posting http://unixsadm.blogspot.com/2010/07/converting-perforce-depots-to-mercurial.html: "Converting Perfoce depots to Mercurial" by Criveti Mihai

10. Bitkeeper

Because of the threatening behavior of Larry McVoldemort of Bitmover, no Bitkeeper conversion tools have been made publically available. See GenericConversion for details on building your own repository conversion tool.

11. TeamWare

Very experimental conversion script available if you can find nothing better:


12. Visual SourceSafe

13. Monotone

14. Other systems

Tailor is a conversion tool that can do simple conversions from a variety of systems. See GenericConversion for details on building your own repository conversion tool.


RepositoryConversion (last edited 2020-07-05 13:34:51 by MarcinKasperski)