bzr needs a float (puts encoded URL on lhs of a format)

[Scott James Remnant (Canonical)]

wing-commander libnih% bzr break-lock bzr+ssh://bazaar.launchpad.net/~scott/libnih/trunk/.bzr/branch/lock
bzr: ERROR: exceptions.TypeError: a float is required

Traceback (most recent call last):
  File "/usr/lib/python2.6/dist-packages/bzrlib/commands.py", line 727, in exception_to_return_code
    return the_callable(*args, **kwargs)
  File "/usr/lib/python2.6/dist-packages/bzrlib/commands.py", line 922, in run_bzr
    ret = run(*run_argv)
  File "/usr/lib/python2.6/dist-packages/bzrlib/commands.py", line 559, in run_argv_aliases
    return self.run(**all_cmd_args)
  File "/usr/lib/python2.6/dist-packages/bzrlib/builtins.py", line 4475, in run
    control.break_lock()
  File "/usr/lib/python2.6/dist-packages/bzrlib/remote.py", line 135, in break_lock
    return BzrDir.break_lock(self)
  File "/usr/lib/python2.6/dist-packages/bzrlib/bzrdir.py", line 122, in break_lock
    thing_to_unlock.break_lock()
  File "/usr/lib/python2.6/dist-packages/bzrlib/remote.py", line 2192, in break_lock
    return self._real_branch.break_lock()
  File "/usr/lib/python2.6/dist-packages/bzrlib/branch.py", line 115, in break_lock
    self.control_files.break_lock()
  File "/usr/lib/python2.6/dist-packages/bzrlib/lockable_files.py", line 140, in break_lock
    self._lock.break_lock()
  File "/usr/lib/python2.6/dist-packages/bzrlib/lockdir.py", line 343, in break_lock
    if bzrlib.ui.ui_factory.get_boolean("Break %s" % lock_info):
  File "/usr/lib/python2.6/dist-packages/bzrlib/ui/__init__.py", line 162, in get_boolean
    self.prompt(prompt + "? [y/n]: ")
  File "/usr/lib/python2.6/dist-packages/bzrlib/ui/__init__.py", line 221, in prompt
    prompt = prompt % kwargs
TypeError: a float is required

bzr 1.14 on python 2.6.2 (linux2)
arguments: ['/usr/bin/bzr', 'break-lock', 'bzr+ssh://bazaar.launchpad.net/~scott/libnih/trunk/.bzr/branch/lock']
encoding: 'UTF-8', fsenc: 'UTF-8', lang: 'en_GB.UTF-8'
plugins:
  builddeb /usr/lib/python2.6/dist-packages/bzrlib/plugins/builddeb [unknown]
  bzrtools /usr/lib/python2.6/dist-packages/bzrlib/plugins/bzrtools [1.14]
  dbus /usr/lib/python2.6/dist-packages/bzrlib/plugins/dbus [0.1dev]
  git /usr/lib/python2.6/dist-packages/bzrlib/plugins/git [0.3.1]
  gtk /usr/lib/python2.6/dist-packages/bzrlib/plugins/gtk [0.96.0.dev.1]
  launchpad /usr/lib/python2.6/dist-packages/bzrlib/plugins/launchpad [unknown]
  netrc_credential_store /usr/lib/python2.6/dist-packages/bzrlib/plugins/netrc_credential_store [unknown]
  rebase /usr/lib/python2.6/dist-packages/bzrlib/plugins/rebase [0.4.4]
  svn /usr/lib/python2.6/dist-packages/bzrlib/plugins/svn [0.5.4]
*** Bazaar has encountered an internal error.
    Please report a bug at https://bugs.launchpad.net/bzr/+filebug
    including this traceback, and a description of what you
    were doing when the error occurred.
zsh: exit 4 bzr break-lock

[Scott James Remnant (Canonical) (canonical-scott)]

The problem is that "prompt" contains:

Break lock bzr+ssh://bazaar.launchpad.net/%7Escott/libnih/trunk/.bzr/branch/lock
held by <email address hidden> on host crowberry [process #9552]
locked 14 minutes, 23 seconds ago? [y/n]:

IE. bzr has over-encoded a URL, replacing the ~ with %7e, and then used that as the LHS of a string format operator