Fix package to install correctly

[danielkucera]

Hello,
I've tried installing package with pip:

$ pip3 install https://github.com/AndrewD/litecan/archive/refs/heads/master.zip
Collecting https://github.com/AndrewD/litecan/archive/refs/heads/master.zip
  WARNING: Keyring is skipped due to an exception: Failed to unlock the keyring!
  Downloading https://github.com/AndrewD/litecan/archive/refs/heads/master.zip
     \ 15 kB 760 kB/s
Building wheels for collected packages: litecan
  Building wheel for litecan (setup.py) ... done
  Created wheel for litecan: filename=litecan-0.0.0-py3-none-any.whl size=989 sha256=01546709bfe7b2ddf93752db4ab1eeebfb7253582bbcf0c5d1072fe0f027ca21
  Stored in directory: /tmp/pip-ephem-wheel-cache-rehnmrqx/wheels/48/3e/43/9a9ad7304876e1fc7b41bb1d40e3d5052a1a2de85b797381fc
Successfully built litecan
Installing collected packages: litecan
Successfully installed litecan-0.0.0

but the import doesn't work:

$ python
Python 3.9.7 (default, Sep 10 2021, 14:59:43) 
[GCC 11.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import litecan
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ModuleNotFoundError: No module named 'litecan'
>>> 

[danielkucera]

zip from github won't works as it cannot provide submodules.
I see 2 options here:

• git clone litecan from github, download submodules, pip install . (as in Make package installable #4 ) - a bit complicated
• configure setup.py to download ctucanfd release during install - this could theoretically work with just zip from github

[AndrewD]

I've cleaned up the install a bit more, but I'm not sure of a solution to the GitHub zip issue you mentioned.

Some litex modules such as pythondata-cpu-vexriscv_smp have submodules but I'm not sure if they solve the issue you mentioned. I only use litex in develop mode so hadn't encountered any of the issues you raised.