WARNING: this extension is incomplete and lightly tested.  It is
currently intended for Mercurial developers or particularly daring

hg-fastimport is a Mercurial extension for importing Git's fast-import
dumps into Mercurial.  fast-import is a file format for representing the
entire history of a version control repository.

This file format was designed to make it easier to write tools which
convert from foreign (non-Git) VCS repository formats into Git; such
tools exist for CVS, Mercurial, Darcs, and Perforce.

However, there's no reason Git should be the only VCS to read
git-fast-import files; for example, Bazaar has a fastimport extension
similar in scope and aim to hg-fastimport.  (In fact, hg-fastimport
draws heavily on the work done for bzr-fastimport.)

The goal of hg-fastimport is to make it just as easy to populate a
Mercurial repository from a fastimport dump as it is for Bazaar or Git.


hg-fastimport depends on:

  * Mercurial 1.9 .. 2.3
  * python-fastimport

The easiest way to get python-fastimport to use OS packages. E.g. for
Debian and Ubuntu:

  sudo aptitude install python-fastimport

Likewise for Fedora:

  sudo yum install python-fastimport

On other operating systems, you can install from PyPI:

  pip install fastimport

If all else fails, you can find the source for python-fastimport here:


To use hg-fastimport, add a line like

  fastimport = /path/to/hg-fastimport/hgfastimport

to the [extensions] section of your hgrc. Don't forget to install
python-fastimport as explained above.

To import into a brand-new Mercurial repository:

  hg init new
  hg -R new fastimport FILE...

where FILE... is a list of one or more fast-import dumps.


hg-fastimport uses Mercurial's own testing infrastructure, so you will
need a copy of the Mercurial source handy.  For example, I keep a clone
of Mercurial "crew" in ~/src/hg-crew.  To test hg-fastimport:

  cd tests
  ~/src/hg-crew/tests/ --local


The fast-import format is documented in the git-fast-import(1) man page:

Tools to convert various version control repositories to
fast-import format:    (CVS)       (Mercurial, Subversion)         (Darcs)


You can get the latest copy of hg-fastimport from its public Mercurial

  hg clone


original author:
  Paul Crowley <paul at lshift dot net>
  LShift Ltd

derived from bzr-fastimport by:
  Ian Clatworthy <ian.clatworthy at internode dot on dot net>
  Canonical Ltd

current maintainer:
  Greg Ward <greg-hg at gerg dot ca>

  Paul Aurich <paul at darkrain42 dot org>
  Jelmer Vernooij <jelmer at samba dot org>


Copyright (C) 2008 Canonical Ltd
Copyright (C) 2008 LShift Ltd.

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
GNU General Public License for more details.

You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.