Rev 1456: Give a reasonable warning on attempts to upgrade a readonly url. in /home/robertc/source/baz/branch-formats/

[Robert Collins]

------------------------------------------------------------
revno: 1456
revision-id: robertc at robertcollins.net-20060120062320-cb96c6d5fecadcd2
parent: robertc at robertcollins.net-20060120055716-00ab1d29129a68ff
committer: Robert Collins <robertc at robertcollins.net>
branch nick: branch-formats
timestamp: Fri 2006-01-20 17:23:20 +1100
message:
  Give a reasonable warning on attempts to upgrade a readonly url.
added:
  bzrlib/tests/blackbox/test_upgrade.py test_upgrade.py-20060120060132-b41e5ed2f886ad28
modified:
  bzrlib/builtins.py             builtins.py-20050830033751-fc01482b9ca23183
  bzrlib/errors.py               errors.py-20050309040759-20512168c4e14fbd
  bzrlib/tests/__init__.py       selftest.py-20050531073622-8d0e3c8845c97a64
  bzrlib/tests/blackbox/__init__.py __init__.py-20051128053524-eba30d8255e08dc3
  bzrlib/upgrade.py              history2weaves.py-20050818063535-e7d319791c19a8b2