urls compared in non-canonical form causes UnlockableTransport

Same here. Started happening a couple of days ago. I only use bzr to check out and build locally the latest AWN trunk. This has worked fine for several weeks until a few days ago.

I do not change anything or try to commit anything back.

Original command was bzr co http://bazaar.launchpad.net/~awn-core/awn/trunk <dir>
Subsequent commands are bzr update from within <dir>

Bug #137157 seems to be a duplicate.

=========================Error output===============================

bzr: ERROR: bzrlib.errors.UnlockableTransport: Cannot lock: transport is read only: <bzrlib.transport.http._urllib.HttpTransport_urllib url=http://bazaar.launchpad.net/%7Eawn-extras/awn-extras/trunk/.bzr/repository/>

Traceback (most recent call last):
  File "/usr/lib/python2.5/site-packages/bzrlib/commands.py", line 817, in run_bzr_catch_errors
    return run_bzr(argv)
  File "/usr/lib/python2.5/site-packages/bzrlib/commands.py", line 779, in run_bzr
    ret = run(*run_argv)
  File "/usr/lib/python2.5/site-packages/bzrlib/commands.py", line 477, in run_argv_aliases
    return self.run(**all_cmd_args)
  File "/usr/lib/python2.5/site-packages/bzrlib/builtins.py", line 1038, in run
    unversioned_filter=tree.is_ignored))
  File "/usr/lib/python2.5/site-packages/bzrlib/workingtree.py", line 2040, in update
    old_tip = self.branch.update()
  File "/usr/lib/python2.5/site-packages/bzrlib/decorators.py", line 165, in write_locked
    return unbound(self, *args, **kwargs)
  File "/usr/lib/python2.5/site-packages/bzrlib/branch.py", line 1823, in update
    self.pull(master, overwrite=True)
  File "/usr/lib/python2.5/site-packages/bzrlib/decorators.py", line 165, in write_locked
    return unbound(self, *args, **kwargs)
  File "/usr/lib/python2.5/site-packages/bzrlib/branch.py", line 1712, in pull
    master_branch.lock_write()
  File "/usr/lib/python2.5/site-packages/bzrlib/branch.py", line 1329, in lock_write
    repo_token = self.repository.lock_write()
  File "/usr/lib/python2.5/site-packages/bzrlib/repository.py", line 307, in lock_write
    result = self.control_files.lock_write(token=token)
  File "/usr/lib/python2.5/site-packages/bzrlib/lockable_files.py", line 258, in lock_write
    token_from_lock = self._lock.lock_write(token=token)
  File "/usr/lib/python2.5/site-packages/bzrlib/lockdir.py", line 556, in lock_write
    return self.wait_lock()
  File "/usr/lib/python2.5/site-packages/bzrlib/lockdir.py", line 485, in wait_lock
    return self.attempt_lock()
  File "/usr/lib/python2.5/site-packages/bzrlib/lockdir.py", line 450, in attempt_lock
    raise UnlockableTransport(self.transport)
UnlockableTransport: Cannot lock: transport is read only: <bzrlib.transport.http._urllib.HttpTransport_urllib url=http://bazaar.launchpad.net/%7Eawn-extras/awn-extras/trunk/.bzr/repository/>

bzr 0.90.0 on python 2.5.1.final.0 (linux2)
arguments: ['/usr/bin/bzr', 'update']

** please send this report to <email address hidden>

On (13/09/07 21:41), danigm wrote:
> Public bug reported:
>
> bzr up, in a application that I have checkout before.
>
> bzr: ERROR: bzrlib.errors.UnlockableTransport: Cannot lock: transport is
> read only: <bzrlib.transport.http._urllib.HttpTransport_urllib
> url=http://bazaar.launchpad.net/%7Eawn-core/awn/trunk/.bzr/repository/>

This always seems to be the one branch that triggers it. Is it a format
issue then? I was trying to debug this, but there was no --format option
to branch to get me an old format branch of this branch. (Working on the
assumption that the checkouts were done a while ago, as I can't
reproduce with recent formats, though there were no new revisions to
pull when I tried, so it might just miss the problem).

Thanks,

James

--
  James Westby -- GPG Key ID: B577FE13 -- http://jameswestby.net/
  seccure key - (3+)k7|M*edCX/.A:n*N!>|&7U.L#9E)Tu)T0>AM - secp256r1/nistp256

This is similar to bug 129701, that running commit in a checkout of a readonly branch gives a traceback. However, there is a difference, which is that running commit in a readonly branch really should fail (but cleanly), whereas running update should not fail at all.

John suggests this may happen when a commit --local has been done before the update. Are there other circumstances? Will a plain checkout; update; update ever cause this?

On Wed, 2007-10-03 at 22:40 +0000, Martin Pool wrote:
> John suggests this may happen when a commit --local has been done before
> the update. Are there other circumstances? Will a plain checkout;
> update; update ever cause this?

If that has been done, it should cause a pivot to occur - the local
branch's head becomes the master's, and the old head becomes a pending
merge.

Neither of which require write access to the master.

-Rob

--
GPG key available at: <http://www.robertcollins.net/keys.txt>.

This seems to be commonly happening, but only reported in regard to this awn branch....

Since I upgraded to bzr 1.17 I also got this when running "bzr up" to checkout from bzr+ssh://bazaar.launchpad.net/%7Ebzr/bzr-git/trunk/

bzr: ERROR: Cannot lock LockDir(lp-44636176:///~bzr/bzr-git/trunk/.bzr/branchlock): Transport operation not possible: readonly transport

Whole debug log from ~/.bzr.log is

0.121 bzr arguments: [u'up']
0.208 looking for plugins in /home/tvainika/.bazaar/plugins
0.270 looking for plugins in /usr/lib/python2.5/site-packages/bzrlib/plugins
0.580 encoding stdout as sys.stdout encoding 'UTF-8'
0.670 opening working tree '/home/tvainika/src/bzr-git/trunk'
1.189 bzr-svn: using Subversion 1.6.3 ()
1.626 opening SVN RA connection to 'bzr+ssh://bazaar.launchpad.net/~bzr/bzr-git/trunk'
1.635 ssh implementation is OpenSSH
5.163 opening SVN RA connection to 'bzr+ssh://bazaar.launchpad.net/~bzr/bzr-git/trunk'
5.512 opening SVN RA connection to 'bzr+ssh://bazaar.launchpad.net/~bzr/bzr-git/trunk'
7.941 Traceback (most recent call last):
  File "/usr/lib/python2.5/site-packages/bzrlib/commands.py", line 835, in exception_to_return_code
    return the_callable(*args, **kwargs)
  File "/usr/lib/python2.5/site-packages/bzrlib/commands.py", line 1030, in run_bzr
    ret = run(*run_argv)
  File "/usr/lib/python2.5/site-packages/bzrlib/commands.py", line 647, in run_argv_aliases
    return self.run(**all_cmd_args)
  File "/usr/lib/python2.5/site-packages/bzrlib/builtins.py", line 1409, in run
    view_info=view_info), possible_transports=possible_transports)
  File "/usr/lib/python2.5/site-packages/bzrlib/workingtree.py", line 2190, in update
    old_tip = self.branch.update(possible_transports)
  File "/usr/lib/python2.5/site-packages/bzrlib/decorators.py", line 192, in write_locked
    result = unbound(self, *args, **kwargs)
  File "/usr/lib/python2.5/site-packages/bzrlib/branch.py", line 2396, in update
    self.pull(master, overwrite=True)
  File "/usr/lib/python2.5/site-packages/bzrlib/decorators.py", line 192, in write_locked
    result = unbound(self, *args, **kwargs)
  File "/usr/lib/python2.5/site-packages/bzrlib/branch.py", line 891, in pull
    possible_transports=possible_transports, *args, **kwargs)
  File "/usr/lib/python2.5/site-packages/bzrlib/branch.py", line 3145, in pull
    master_branch.lock_write()
  File "/usr/lib/python2.5/site-packages/bzrlib/remote.py", line 2178, in lock_write
    remote_tokens = self._remote_lock_write(token)
  File "/usr/lib/python2.5/site-packages/bzrlib/remote.py", line 2169, in _remote_lock_write
    repo_token or '', **err_context)
  File "/usr/lib/python2.5/site-packages/bzrlib/remote.py", line 54, in _call
    return self._client.call(method, *args)
  File "/usr/lib/python2.5/site-packages/bzrlib/smart/client.py", line 129, in call
    result, protocol = self.call_expecting_body(method, *args)
  File "/usr/lib/python2.5/site-packages/bzrlib/smart/client.py", line 142, in call_expecting_body
    method, args, expect_response_body=True)
  File "/usr/lib/python2.5/site-packages/bzrlib/smart/client.py", line 78, in _call_and_read_response
    expect_body=expect_response_body),
  File "/usr/lib/python2.5/site-packages/bzrlib/smart/message.py", line 306, in read_response...

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Hash: SHA1

Tommi Vainikainen wrote:
> Since I upgraded to bzr 1.17 I also got this when running "bzr up" to
> checkout from bzr+ssh://bazaar.launchpad.net/%7Ebzr/bzr-git/trunk/
>
> bzr: ERROR: Cannot lock LockDir(lp-44636176:///~bzr/bzr-
> git/trunk/.bzr/branchlock): Transport operation not possible: readonly
> transport
>

^- This is happening because the code changed to switch escaping rules.
So we have a saved location of:

.../%7E...

but you are now updating from:
.../~...

And the internal code uses:
  if url == saved_url:
    # updating from checkout master, just take a read lock
    tree.lock_read()
  else:
    tree.lock_write()

They no longer compare equal, so now you get a failure as you can't
write lock the master branch.

I don't know for sure the workaround, but something like:

bzr unbind; bzr bind; bzr up
or worst case

bzr unbind; bzr bind lp:bzr-git; bzr up

Should get it to work.

John
=:->
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> ^- This is happening because the code changed to switch escaping rules.
> So we have a saved location of:
>
> .../%7E...
>
> but you are now updating from:
> .../~...

aha, thanks for the explanation, it all makes sense now.
I was hitting this a lot and almost gave up on checkouts of mainlines
on launchpad.

 summary "urls compared in non-canonical form causes UnlockableTransport
running update"

This could lead to other problems in fetch. We should compare urls in
canonical form - the escaping rules are set by a standard. Human display
escaping should only be used to affect the UI/saved data on disk.

-Rob