Use relative imports

[sbidoul]

Coming from #83 I think this should help.

I tested python -m zfs_autobackup with python2 and 3, and the zipapp and both seem work fine.

[psy0rz]

I tried your changes to no avail:

psy@ws1 ~/zfs_autobackup % python3 -m zipapp zfs_autobackup  -p "/usr/bin/env python3" -o zfs-autobackup  ; ./zfs-autobackup
Traceback (most recent call last):
  File "/usr/lib/python3.8/runpy.py", line 194, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "/usr/lib/python3.8/runpy.py", line 87, in _run_code
    exec(code, run_globals)
  File "./zfs-autobackup/__main__.py", line 8, in <module>
ImportError: attempted relative import with no known parent package
psy@ws1 ~/zfs_autobackup % python3 --version                                                                                
Python 3.8.10
psy@ws1 /tmp % lsb_release -a
No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 20.04.3 LTS
Release:	20.04
Codename:	focal

I'll try upgrading and on another system. Maybe its something local.

(But i can confirm everything still works with your changes, including creating and installing the pip package.)

[sbidoul]

I tried your changes to no avail:

I think it's because you are packing the content of the zfs_autobackup directory instead of the directory itself.

The original procedure in #83 (comment) works for me.
It packs the zfs_autobackup directory and tells it the main entry point is zfs_autobackup:cli.

But i can confirm everything still works with your changes, including creating and installing the pip package

Yep. Relative imports is good practice anyway and this should be safe to merge.

[psy0rz]

I think it's because you are packing the content of the zfs_autobackup directory instead of the directory itself.

DOH! I tried by using the whole gitrepo, instead of the zfs_autobackup subdir and now its fine.

I'll also try to include argparse and colorama in it, as that seems to be possible according to zipapp docs.