bzr http URL stores evaluated URL instead of the link

[Данило Шеган]

We've recently hit a problem where 'bzr pull' did not update to the latest trunk of lp:goyaml.

After a bit of investigation, it seems that http://launchpad.net/goyaml, which 'go get' seems to do a 'bzr pull'/'bzr branch' off, does a permanent redirect (for bzr client, at least) to an evaluated bzr branch path, thus the branch will end up with a parent pointing to something like the following

$ bzr info
Standalone tree (format: 2a)
Location:
  branch root: .

Related branches:
  parent branch: http://bazaar.launchpad.net/~goyaml/goyaml/trunk/
  submit branch: .

However, if the 'main branch' is changed to point to a different branch (or, eg. if the branch owner is changed), this URL will be out of date. This is exactly the problem we hit: people had outdated branches since trunk has moved and 'bzr pull' simply reported no new revisions.

Neither does it work correctly with URLs like https://code.launchpad.net/+branch/goyaml:

$ bzr pull --remember https://code.launchpad.net/+branch/goyaml
https://code.launchpad.net/%2Bbranch/goyaml is permanently redirected to https://code.launchpad.net/~goyaml/goyaml/trunk
https://code.launchpad.net/+branch/goyaml/ is permanently redirected to https://code.launchpad.net/~goyaml/goyaml/trunk/

But, it works correctly with lp:goyaml URL when appropriate bzr+ssh://bazaar.launchpad.net/+branch/goyaml URL is used (though this requires one to be logged into Launchpad; I suspect similar problems will happen if it falls back to http for unauthenticated users, but I haven't tested it):

$ bzr pull --remember lp:goyaml
No revisions or tags to pull.
$ bzr info
Standalone tree (format: 2a)
Location:
  branch root: .

Related branches:
  parent branch: bzr+ssh://bazaar.launchpad.net/+branch/goyaml/
  submit branch: .

To clarify, I am not certain this is a LP bug. I am just hoping LP could not be giving out permanent redirects (but temporary ones) and bzr would then respect that and store the shorter URL it started off with.

[Robert Collins (lifeless)]

I believe this is a dupe of a much older bug.