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Thomas De Schampheleire

lib: fix detection of ' as issue reference

Commit 494c793cc160 changed HTML escaping to please HTML 4 email readers.
The HTML entity ''' was replaced by '''.
Unfortunately, the pound character '#' is often used to mark issue
references, like 'bug #56'. While this depends on the issue patterns
actually configured, this pattern is so common that we cannot expect users
to set their issue_pat regular expressions such that '{' is not
matched.

Instead, keep the original ''' replacement at first in method html_escape,
but introduce a final step that just replaces ''' with '''.

The order of replacement in urlify_text then changes from:
html_escape (to HTML4)
urlify_issues
to
html_escape (to HTML5)
urlify_issues
make HTML5 more like HTML4

Test coverage show the problem case being solved.

.. _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.