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Thomas De Schampheleire
pytest migration: make pytest's parametrize functionality available

To provide parameterized tests, a custom implementation is currently
provided at kallithea/tests/parameterized.py because nose does not provide
that out-of-the-box.
pytest, on the other hand, does have a built-in 'parametrize' (note:
different spelling) functionality. Therefore, once all tests have been
converted to pytest, we can get rid of the custom 'parameterized'
implementation. Also, the existing 'parameterized' implementation does not
seem to work under pytest-style tests.

This commit makes pytest's 'parametrize' decorator available alongside the
custom 'parameterized' decorator. The names are confusing but it is the
intention to kill the original 'parameterized' soon.
.. _locking:

==================
Repository locking
==================

Kallithea has a *repository locking* feature, disabled by default. When
enabled, every initial clone and every pull gives users (with write permission)
the exclusive right to do a push.

When repository locking is enabled, repositories get a ``locked`` flag.
The hg/git commands ``hg/git clone``, ``hg/git pull``,
and ``hg/git push`` influence this state:

- A ``clone`` or ``pull`` action locks the target repository
  if the user has write/admin permissions on this repository.

- Kallithea will remember the user who locked the repository so only this
  specific user can unlock the repo by performing a ``push``
  command.

- Every other command on a locked repository from this user and every command
  from any other user will result in an HTTP return code 423 (Locked).
  Additionally, the HTTP error will mention the user that locked the repository
  (e.g., “repository <repo> locked by user <user>”).

Each repository can be manually unlocked by an administrator from the
repository settings menu.