port select should record its symlinks in the registry

[mf2k (Frank Schima)]

Symbolic links created by port should be recorded in the registry. For example, the python_select port creates symlinks to a specific version of python and its helper programs.

$ ls -l /opt/local/bin/python
lrwxr-xr-x  1 root  admin  24 Jan 23 15:05 /opt/local/bin/python -> /opt/local/bin/python2.7

$ port provides /opt/local/bin/python
/opt/local/bin/python is not provided by a MacPorts port.

$ port contents python_select
Port python_select contains:
  /opt/local/etc/select/python/base
  /opt/local/etc/select/python/none
  /opt/local/etc/select/python/python25-apple
  /opt/local/etc/select/python/python26-apple
  /opt/local/etc/select/python/python27-apple

[neverpanic (Clemens Lang)]

Cc Me!

[cooljeanius (Eric Gallager)]

This has come up previously in comment:ticket:37853:5, but it was kind of a tangent from the base issue there...

[cooljeanius (Eric Gallager)]

Cc Me!

[raimue (Rainer Müller)]

This could be solved by registering the symlinks created by port select to the corresponding *_select port in the registry (the port that provides the base file). The symlinks would then be removed when the port is deactivated. However, as the symlinks are not part of the port archive, they would not be restored when the port is activated again. That would require re-running port select.