Some people would like to see Mercurial support.
Documentation
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SSH access
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http://www.selenic.com/mercurial/wiki/index.cgi/SharedSSH
This method looks a bit rusty though.
However, 'hg' is similar to cvs/svn/bzr/rsync and we can restrict to run in push/pull mode only (no repository creation since we want hooks to be controlled by us).
Web browsing
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It's done through hgwebdir.cgi
Instructions for mod_python:
* http://www.newartisans.com/blog_files/mercurial.with.mod_python.php and http://www.selenic.com/pipermail/mercurial/2007-May/013226.html (mod_python)
* http://blog.sietch-tabr.com/index.php/post/2008/01/21/Mercurial-:-partage-de-depots-differents-en-http-et-https-push-par-https (CGI)
About mod_wsgi: according to http://www.selenic.com/mercurial/wiki/index.cgi/modwsgi
Mercurial 0.9.4 (0.9.5 in Etch and backports) is for mod_wsgi version 1.1. May be this is fixed in Mercurial 1.0.1.
Existing hosting
================
* http://freehg.org/ with its source code http://freehg.org/u/mmarshall/freehg/