ff04d1bfc1
* Extract the MetaPathFinder and Loaders for packages in their own classes https://peps.python.org/pep-0451/ Currently, RepoPath and Repo implement the (deprecated) interface of MetaPathFinder (find_module) and of Loader (load_module). This commit extracts both of them and places the code in their own classes. The MetaPathFinder interface is updated to contain both the deprecated "find_module" (for Python 2.7 support) and the recommended "find_spec". Update of the Loader interface is deferred at a subsequent commit. * Move the lines to be prepended inside "RepoLoader" Also adjust the naming of a few variables too * Remove spack.util.imp, since code is only used in spack.repo * Remove support from loading Python modules Python > 3 but < 3.5 * Remove `Repo._create_namespace` This function was interacting badly with the MetaPathFinder and causing issues with "normal" imports. Removing the function allows to do things like: ```python import spack.pkg.builtin.mpich cls = spack.pkg.builtin.mpich.Mpich ``` * Remove code needed to trigger the Singleton evaluation The finder is coded in a way to trigger the Singleton, so we don't need external code now that we register it at module level into `sys.meta_path`. * Add unit tests |
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