[MacPorts] #69534: Trace mode does not fully hide python modules (was: py39-setuptools @69.2.0: AttributeError: module 'importlib_metadata' has no attribute 'MetadataPathFinder')

[MacPorts]

#69534: Trace mode does not fully hide python modules
------------------------------+----------------------
  Reporter:  ryandesign       |      Owner:  (none)
      Type:  defect           |     Status:  assigned
  Priority:  Normal           |  Milestone:
 Component:  base             |    Version:  2.9.1
Resolution:                   |   Keywords:
      Port:  py39-setuptools  |
------------------------------+----------------------
Changes (by jmroot):

 * owner:  jmroot => (none)
 * component:  ports => base


Comment:

 OK, so if it works without trace mode whether or not py39-importlib-
 metadata is installed, which seems to be the case, this must be a bug in
 trace mode. Setuptools does use importlib_metadata but vendors its own
 copy, and inspects any other version that is installed to try to prevent
 conflicts. There have been cases previously where a file being hidden by
 trace mode gave different results than not having the file installed, for
 example #65109. That must mean that some mechanism being used to detect
 the file's existence is not being correctly intercepted by trace mode.

-- 
Ticket URL: <https://trac.macports.org/ticket/69534#comment:4>
MacPorts <https://www.macports.org/>
Ports system for macOS