fix(runfiles): correct Python runfiles path assumption #3086
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The current _FindPythonRunfilesRoot() implementation assumes that the Python module has been unpacked four levels below the runfiles directory. This is not the case in multiple situations, for example when rules_pycross is in use and has installed the module via pypi (in which case it is five levels below runfiles). Both strategies already know where the runfiles directory exists - implement _GetRunfilesDir() on the _DirectoryBased strategy, then call _GetRunfilesDir() in order to populate self._python_runfiles_dir. Stop passing a bogus path to runfiles.Create() in testCurrentRepository(), such that the test actually uses the appropriate runfiles path. Fixes bazel-contrib#3085
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The current _FindPythonRunfilesRoot() implementation assumes that
the Python module has been unpacked four levels below the runfiles
directory. This is not the case in multiple situations, for example when
rules_pycross is in use and has installed the module via pypi (in which
case it is five levels below runfiles).
Both strategies already know where the runfiles directory exists -
implement _GetRunfilesDir() on the _DirectoryBased strategy, then call
_GetRunfilesDir() in order to populate self._python_runfiles_dir.
Stop passing a bogus path to runfiles.Create() in testCurrentRepository(),
such that the test actually uses the appropriate runfiles path.
Fixes #3085