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Manuel Jacob

controllers: don’t pass start=0 to BaseRepository.get_changesets()

MercurialRepository.get_changesets() can fail if passing start=0 if the
revision 0 is not in self.revisions. That can happen if revision 0 is not in
the visible subset of the revisions in the repository. Before Kallithea
changeset 7c43e15fb8bc7a73f17f577e59a4698589b6809d, it was working by chance
because start=0 was treated like start=None in the relevant places
(GitRepository.get_changesets still does that).

The intention of passing start=0 was seemingly to not limit the start.
Therefore passing start=None (or nothing, as it’s the default value) should be
correct.

I got the following traceback before this change:

Traceback (most recent call last):
File "~/vcs/kallithea/kallithea/controllers/changelog.py", line 117, in index
collection = c.db_repo_scm_instance.get_changesets(start=0, end=revision,
File "~/vcs/kallithea/kallithea/lib/vcs/backends/hg/repository.py", line 529, in get_changesets
start_pos = None if start is None else self.revisions.index(start_raw_id)
ValueError: '4257f758b3eaacaebb6956d1aefc019afab956b8' is not in list

.. _vcs_setup:

=============================
Version control systems setup
=============================

Kallithea supports Git and Mercurial repositories out-of-the-box.
For Git, you do need the ``git`` command line client installed on the server.

You can always disable Git or Mercurial support by editing the
file ``kallithea/__init__.py`` and commenting out the backend. For example, to
disable Git but keep Mercurial enabled:

.. code-block:: python

   BACKENDS = {
       'hg': 'Mercurial repository',
       #'git': 'Git repository',
   }


Git-specific setup
------------------


Web server with chunked encoding
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Large Git pushes require an HTTP server with support for
chunked encoding for POST. The Python web servers waitress_ and
gunicorn_ (Linux only) can be used. By default, Kallithea uses
waitress_ for `gearbox serve` instead of the built-in `paste` WSGI
server.

The web server used by gearbox is controlled in the .ini file::

    use = egg:waitress#main

or::

    use = egg:gunicorn#main

Also make sure to comment out the following options::

    threadpool_workers =
    threadpool_max_requests =
    use_threadpool =

Increasing Git HTTP POST buffer size
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

If Git pushes fail with HTTP error code 411 (Length Required), you may need to
increase the Git HTTP POST buffer. Run the following command as the user that
runs Kallithea to set a global Git variable to this effect::

    git config --global http.postBuffer 524288000


.. _waitress: http://pypi.python.org/pypi/waitress
.. _gunicorn: http://pypi.python.org/pypi/gunicorn
.. _subrepositories: http://mercurial.aragost.com/kick-start/en/subrepositories/