Port version 1.520: py-gnome is inconsistent.

[Ryan Schmidt]

Let's continue this only on the macports-users list; one list ought  
to be sufficient.

On Nov 23, 2007, at 21:48, Douglas Philips wrote:

> First thing I did was port -d selfupdate. port --version says:
> 	MacPorts 1.520
> and goes into interactive mode.
>
> I started out trying to install meld. That apparently is an  
> infinite task. After waiting over 5 minutes for port to stop what  
> seemed to be an infinite loop of scanning dependencies, I went  
> after it by hand and started installing the pieces.

You can use the debug flag -d to see exactly what MacPorts is doing,  
to see if it's really in an infinite loop or just busy doing things.  
("sudo port -d install foo") I'm not sure if it's the case here, but  
there is software (like gcc42) which requires hours to build even on  
today's fastest Macs.

> Until I found an inconsistency. I went after port deps on all the  
> parts looking for where the problem was. Had I known it would have  
> taken me 3 hours, I wouldn't have bothered. But since I spent the  
> time looking (and I started bottom up :(, so I didn't find this  
> very quickly) I wanted to raise this issue:
>
> (Eliding the branches of dependencies which aren't relevant to this  
> conflict...)
>
> meld depends on py-gnome and py-gtk2
>
> py-gnome depends on libzvt and py-gtk2
>
> libzvt depends on gnome_session depends on control-center depends  
> on nautilus depends on eel depends gnome_menus depends on py25_gtk2  
> (!) depends on py25_cairo
>
> py_gtk2 depends on py_cairo

I had trouble visualizing this, so I made a graph of these  
dependencies in Graphviz. Source dot file and resulting png image  
attached.

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> py25_cairo and py_cairo cannot be installed at the same time:
>
> # port install py25-cairo
> --->  Activating py25-cairo 1.4.0_1
> Error: Target org.macports.activate returned: Image error: /opt/ 
> local/include/pycairo/pycairo.h is being used by the active py- 
> cairo port.  Please deactivate this port first, or use the -f flag  
> to force the activation.
> Error: Status 1 encountered during processing.

Restated, the problem is that the meld port depends indirectly on  
both py-cairo and py25-cairo, but the two cannot be installed  
simultaneously. (I do not know whether it should be possible to  
install arbitrary py-foo and py25-foo simultaneously.)