[MacPorts] #23520: py26-docutils upgrade doesn't go smoothly because of py26-roman

[MacPorts]

#23520: py26-docutils upgrade doesn't go smoothly because of py26-roman
-------------------------------------+--------------------------------------
 Reporter:  ryandesign@…             |       Owner:  jmr@…                    
     Type:  defect                   |      Status:  new                      
 Priority:  Normal                   |   Milestone:                           
Component:  ports                    |     Version:  1.8.2                    
 Keywords:                           |        Port:  py26-docutils, py26-roman
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 Upgrading py26-docutils 0.5 to 0.6 does not go smoothly:

 {{{
 $ sudo port -u upgrade py26-docutils
 Password:
 --->  Computing dependencies for py26-roman
 --->  Fetching py26-roman
 --->  Attempting to fetch roman-1.4.0.tar.gz from
 http://distfiles.macports.org/python
 --->  Verifying checksum(s) for py26-roman
 --->  Extracting py26-roman
 --->  Configuring py26-roman
 --->  Building py26-roman
 --->  Staging py26-roman into destroot
 --->  Installing py26-roman @1.4.0_0
 --->  Activating py26-roman @1.4.0_0
 Error: Target org.macports.activate returned: Image error:
 /opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6
 /site-packages/roman.py is being used by the active py26-docutils port.
 Please deactivate this port first, or use 'port -f activate py26-roman' to
 force the activation.
 Error: Problem while installing py26-roman
 Before reporting a bug, first run the command again with the -d flag to
 get complete output.
 $
 }}}

 py26-docutils 0.5 provided roman.py. Now that file is provided by
 py26-roman and py26-docutils now declares a dependency on it. But that
 dependency cannot be activated while the old version of py26-docutils is
 active.

 Perhaps this can be solved similarly to the way I solved the issue when
 spawn-fcgi was broken out of lighttpd; see r58202. The success of this
 method depends on being able to programmatically identify the version of
 py26-docutils currently installed; if that can be done, this solution
 should be possible. Another example of the same solution in action is in
 the dcraw port, to prevent a conflict when upgrading ufraw; see r62451.

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Ticket URL: <http://trac.macports.org/ticket/23520>
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