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hg-fast-export.(sh|py) - mercurial to git converter using git-fast-import
Legal
=====
Most hg-* scripts are licensed under the MIT license[0] and were written
by Rocco Rutte <pdmef@gmx.net> with hints and help from the git list and
#mercurial on freenode. hg-reset.py is licensed under GPLv2 since it
copies some code from the mercurial sources.
The current maintainer is Frej Drejhammar <frej.drejhammar@gmail.com>.
Usage
=====
Using hg-fast-export is quite simple for a mercurial repository <repo>:
mkdir repo-git # or whatever
cd repo-git
git init
hg-fast-export.sh -r <repo>
Incremental imports to track hg repos is supported, too.
Using hg-reset it is quite simple within a git repository that is
hg-fast-export'ed from mercurial:
hg-reset.sh -R <revision>
will give hints on which branches need adjustment for starting over
again.
As mercurial appears to be much less picky about the syntax of the
author information than git, an author mapping file can be given to
hg-fast-export to fix up malformed author strings. The file is
specified using the -A option. The file should contain lines of the
form "FromAuthor=ToAuthor". The example authors.map below will
translate "User <garbage<user@example.com>" to "User <user@example.com>".
-- Start of authors.map --
User <garbage<user@example.com>=User <user@example.com>
-- End of authors.map --
Notes/Limitations
=================
hg-fast-export supports multiple branches but only named branches with
exaclty one head each. Otherwise commits to the tip of these heads
within branch will get flattened into merge commits.
As each git-fast-import run creates a new pack file, it may be
required to repack the repository quite often for incremental imports
(especially when importing a small number of changesets per
incremental import).
The way the hg API and remote access protocol is designed it is not
possible to use hg-fast-export on remote repositories
(http/ssh). First clone the repository, then convert it.
Design
======
hg-fast-export.py was designed in a way that doesn't require a 2-pass
mechanism or any prior repository analysis: if just feeds what it
finds into git-fast-import. This also implies that it heavily relies
on strictly linear ordering of changesets from hg, i.e. its
append-only storage model so that changesets hg-fast-export already
saw never get modified.
Footnotes
=========
[0] http://www.opensource.org/licenses/mit-license.php
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