[MacPorts] #44267: root6: Portfile parse problem when root5 installed

[MacPorts]

#44267: root6: Portfile parse problem when root5 installed
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  Reporter:  mf2k@…  |      Owner:  mojca@…
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:  2.3.99
Resolution:          |   Keywords:
      Port:  root6   |
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Comment (by jonesc@…):

 Hi,

 I cannot pre-produce your 'failed to parse' error, but I can reproduce the
 general issue that various port commands don't given much useful
 information once root5 is installed with +python27, and with root6 having
 that variant enabled by default

 {{{
 macmini ~ > sudo port install root6
 Error: Cannot install root6 with +python27 variant
 Error: Unable to open port: root5 port is already installed with +python27
 and both cannot be active at once. Pick a different python variant.
 macmini ~ > sudo port info root6
 Error: Cannot install root6 with +python27 variant
 Error: Unable to open port: root5 port is already installed with +python27
 and both cannot be active at once. Pick a different python variant.
 macmini ~ > sudo port variants root6
 Error: Cannot install root6 with +python27 variant
 Error: Unable to open port: root5 port is already installed with +python27
 and both cannot be active at once. Pick a different python variant.
 }}}

 I have a patch that proves moving the check to a later phases fixes the
 above. It worked for me moving it to pre-activate, but this is not ideal
 as it would mean in some cases the user would only find out after the long
 build. I couldn't though find a phase that both worked and avoided this...
 ? I attach the patch just for reference...

 Chris

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Ticket URL: <https://trac.macports.org/ticket/44267#comment:3>
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