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Mads Kiilerich
setup: don't use setuptools 34 - it has indirect conflicts with the celery version supported on the stable branch (Issue #266)

Setuptools==34 requires packaging>=16.8 which has an unconstrained requirement
of pyparsing ... but actually it doesn't work with pyparsing==1.5.7 ... which
is required by celery<2.3 ... which this version of Kallithea requires.

Celery has been upgraded on the development branch but we don't want to do that
on the stable branch.
.. _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.