upgrading charms from oneiric to precise

[Kapil Thangavelu]

This appears to have broken all the official oneiric charms. Why where they 
renamed as opposed to merged/copied into the correct location? The oneiric 
charms should still be promulgated for the oneiric series. Which series trunk 
branch lp:charms/<name> points to is controlled by the current series on lp, 
not by the promulgation process alone.

we need to figure out how to restore the oneiric charms. 

-kapil

Excerpts from Mark Mims's message of 2012-05-04 15:35:02 -0400:
> Capturing notes on how we did this so when we're changing from p to q on 
> October we have some clue as to what we did here.
> 
> ----------8<----------------
> 
> # lp changes
> 
> So this started with the lp team running `branch-distro` for charms.
> 
> This took all branches in the store `lp:charms/<charm-name>`
> (which are aliases to `lp:~charmers/charms/oneiric/<charm-name>/trunk`) and:
>    - renamed them to `lp:~charmers/charms/precise/<charm-name>/precise`
>    - created `lp:charms/<charm-name>` aliases pointing to these new branches
> 
> 
> # the problem
> 
> This naming scheme doesn't fit into our naming scheme for juju and the 
> charmstore...
> namely `lp:~charmers/charms/<series>/<charm-name>/trunk`
> 
> 
> # renames
> 
> To fix this, we rename from `/precise` to `/trunk` across the board:
> 
>      #!/usr/bin/python
> 
>      from launchpadlib.launchpad import Launchpad
> 
>      lp = Launchpad.login_with('rename-charms', 
> service_root='production', version='1.0')
> 
>      for branch in lp.people['charmers'].getBranches():
>          if branch.unique_name.startswith('~charmers/charms/precise/') 
> and branch.name == 'precise':
>              print "Renaming " + branch.unique_name
>              branch.name = 'trunk'
>              try:
>                  branch.lp_save()
>              except:
>                  print "couldn't do "
>                  print branch
> 
> 
> # more problems
> 
> which barfs when there are existing branches with that name.
> 
> Example:
>    - before `branch-distro`
>      - `lp:charms/nova-compute` points to 
> `lp:~charmers/charms/oneiric/nova-compute/trunk` (r28)
>      - `lp:~charmers/charms/precise/nova-compute/trunk` (r34) exists for 
> development on precise
>    - after `branch-distro`
>      - `lp:charms/nova-compute` points to 
> `lp:~charmers/charms/precise/nova-compute/precise` (r28)
>      - `lp:~charmers/charms/precise/nova-compute/trunk` (r34) exists and 
> should be the official aliased charm but isn't
> 
> 
> # repromulgation
> 
> Clint wrote `charm unpromulgate` which would allow us to:
> 
>      bzr branch lp:charms/nova-compute
>      cd nova-compute
>      bzr push :parent
>      edit .bzr/branch/branch.conf and replace everything with 
> bzr+ssh://bazaar.launchpad.net/~charmers/charms/precise/nova-compute/precise
>      charm unpromulgate
> 
>      cd ..
>      mv nova-compute nova-compute-barfed
>
>
> 
> and then promulgate the correct branch
> 
>      bzr branch lp:~charmers/charms/precise/nova-compute/trunk nova-compute
>      cd nova-compute
>      bzr push :parent
>      charm promulgate
> 
> ----------8<----------------
> 
> (logs captured in `lp:~mark-mims/+junk/charm-branch-distro-notes`)
> 
> -- 
> Mark Mims, Ph.D.
> Canonical Ltd.
> mark.mims at canonical.com
> +1(512)981-6467
>