[MacPorts] #14615: select.sh tools (python_select, gcc_select) should remember selected versions across upgrade

[MacPorts]

#14615: select.sh tools (python_select, gcc_select) should remember selected
versions across upgrade
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 Reporter:  macports_dharland at trashmail.net  |       Owner:  macports-tickets at lists.macosforge.org
     Type:  defect                           |      Status:  new                                  
 Priority:  Normal                           |   Milestone:  Port Enhancements                    
Component:  ports                            |     Version:  1.6.0                                
 Keywords:                                   |  
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 Suppose that a user has installed python_select and used as follows

     python_select python24

 Currently, an upgrade to python_select will result in the users setting
 being forgotten.  In fact since the post-destroot for python_select
 explicitly chooses python23-apple, /opt/local/bin/python will now point to
 a different executable/version than before the upgrade.

 This isn't great and can cause python programs to crash for reasons that
 aren't that obvious to the user.

 A suggested solution is for $TOOL_select to also write a symlink pointing
 to the selected option such as

     /opt/local/etc/selected/python->/opt/local/etc/select/python/python24

 Then upon activation $TOOL_select can be run passing the users previously
 selected version.

 In addition a -s option could be provided to $TOOL_select to report the
 currently selected version.

-- 
Ticket URL: <http://trac.macosforge.org/projects/macports/ticket/14615>
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