doc: specify what is required for dockerFile

[shaunc]

I have a Dockerfile:

FROM public.ecr.aws/lambda/python:3.10

RUN yum install -y libffi libffi-devel postgresql-devel postgresql-libs gcc

And sls configuration:

  pythonRequirements:
    dockerFile: ./Dockerfile
    dockerizePip: non-linux

This gives the error:

Running "docker run --rm -v /Users/shauncutts/Library/Caches/serverless-python-requirements/86c924ff078f80e03d14d56c584f87f0cbbbdb7c8193b653db2fcbfe2d8fc440_x86_64_slspyc:/var/task:z -v /Users/shauncutts/Library/Caches/serverless-python-requirements/downloadCacheslspyc:/var/useDownloadCache:z -u 0 sls-py-reqs-custom python3.10 -m pip install -t /var/task/ -r /var/task/requirements.txt --cache-dir /var/useDownloadCache" failed with: "entrypoint requires the handler name to be the first argument"

However, when I try to put in an entrypoint into the dockerfile:

FROM public.ecr.aws/lambda/python:3.10-x86_64

RUN yum install -y libffi libffi-devel postgresql-devel postgresql-libs gcc

ENTRYPOINT [ "/bin/bash", "-c" ]

This builds, but the resulting archive doesn't have any dependencies from requirements:

unzip -l .serverless/cdh-send-sftp-cachematrix.zip
Archive:  .serverless/cdh-send-sftp-cachematrix.zip
  Length      Date    Time    Name
---------  ---------- -----   ----
    11788  01-01-1980 00:00   crane-provider.yml
      157  01-01-1980 00:00   Dockerfile
     1466  01-01-1980 00:00   handler.py
    15714  01-01-1980 00:00   node_modules/.yarn-integrity
    20595  01-01-1980 00:00   package-lock.json
      250  01-01-1980 00:00   package.json
      184  01-01-1980 00:00   Pipfile
    15821  01-01-1980 00:00   Pipfile.lock
      426  01-01-1980 00:00   send-config.yaml
        0  01-01-1980 00:00   send/__init__.py
      151  01-01-1980 00:00   send/__pycache__/__init__.cpython-36.pyc
     1949  01-01-1980 00:00   send/__pycache__/check_db.cpython-36.pyc
     1333  01-01-1980 00:00   send/__pycache__/download.cpython-36.pyc
      221  01-01-1980 00:00   send/__pycache__/log.cpython-36.pyc
      787  01-01-1980 00:00   send/__pycache__/send_config.cpython-36.pyc
     2139  01-01-1980 00:00   send/__pycache__/send.cpython-36.pyc
     2084  01-01-1980 00:00   send/__pycache__/to_server.cpython-36.pyc
     1876  01-01-1980 00:00   send/check_db.py
      896  01-01-1980 00:00   send/download.py
       69  01-01-1980 00:00   send/log.py
      550  01-01-1980 00:00   send/send_config.py
     1901  01-01-1980 00:00   send/send.py
     2299  01-01-1980 00:00   send/to_server.py
      615  01-01-1980 00:00   ssh/known_hosts
    30226  01-01-1980 00:00   yarn.lock
        0  01-01-2098 00:00   .completed_requirements
      201  01-01-2098 00:00   requirements.txt
---------                     -------
   113698                     27 files

What are the requirements for the Dockerfile? How does serverless know where to take the libraries from and how come they don't end up in the archive?