"replaced by" advice

[Ryan Schmidt]

On Jun 26, 2013, at 09:59, David Strubbe <dstrubbe at gmail.com> wrote:

> The advice for replacing one port by another at http://guide.macports.org/#development.replaced_by involves inserting this code:
> pre-configure {
>     ui_error "Please do not install this port since it has been replaced by 'skrooge'."
>     return -code error
> }
> 
> If you have the port installed, when it gets replaced, it is deactivated and the new port is installed. But if you try to activate the old port later, not realizing it was replaced, this pre-configure error is not triggered, since no configure occurs. Instead, you may get errors on activation, with no explanation about the port replacement. That is what I experienced below. Could this ui_error block be put in a later stage too, e.g. pre-activate, to make this clear? Or maybe have the obsolete port marked as conflicting. Otherwise, one has to examine the Portfile to understand why you can't activate the port.
> 
> David
> 
> $ sudo port activate py27-gtk @2.22.0_3+quartz
> Password:
> --->  Computing dependencies for py27-gtk
> --->  Activating py27-gtk @2.22.0_3+quartz
> Error: org.macports.activate for port py27-gtk returned: Image error: /opt/local/Library/Frameworks/Python.framework/Versions/2.7/bin/pygtk-codegen-2.0 is being used by the active py27-pygtk port.  Please deactivate this port first, or use 'port -f activate py27-gtk' to force the activation.
> Please see the log file for port py27-gtk for details:
>     /opt/local/var/macports/logs/_opt_local_var_macports_registry_portfiles_py27-gtk_2.22.0_3+quartz/py27-gtk/main.log
> Warning: Failed to execute portfile from registry for py27-gtk @2.22.0_3+quartz
> --->  Activating py27-gtk @2.22.0_3+quartz
> Error: port activate failed: Image error: /opt/local/Library/Frameworks/Python.framework/Versions/2.7/bin/pygtk-codegen-2.0 is being used by the active py27-pygtk port.  Please deactivate this port first, or use 'port -f activate py27-gtk' to force the activation.

I can't think of any good way to prevent this.

The py27-gtk @2.22.0_3+quartz you have installed does not contain any statements about having been replaced. It's the *next* version of the port (the one that, thanks to the above pre-configure block, cannot be installed) that contains those statements.