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Thomas De Schampheleire
controllers: forward pullrequests.delete_comment to changeset

Remove duplication between pullrequests and changeset.
We move the code outside ChangesetController to make it callable from
PullrequestsController.

Note:
- instead of keeping the method pullrequests.delete_comment itself and
letting it forward to changeset.delete_comment, an alternative solution
would have been to change the routing table directly. However, the chosen
solution makes it more explicit which operations are supported on each
controller.
.. _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.