cfm/README.md

## README.md

      
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              README.md
            
          
    Setup

$ docker build -f python3.7.Dockerfile -t sddp-350-py3.7 .
$ docker build -f python3.9.Dockerfile -t sddp-350-py3.9 .
Expected results


Command
Python
Result


docker run sddp-350-py3.9
3.9
✓


docker run sddp-350-py3.7
3.7
✗


docker run -e PIP_CONSTRAINT=constraints.txt sddbp-350-py3.7
3.7
✓


## python3.7.Dockerfile
FROM python:3.7-alpine

COPY ./constraints.txt ./
COPY ./test ./

ENTRYPOINT ./test

## python3.9.Dockerfile
FROM python:3.9-alpine

COPY ./constraints.txt ./
COPY ./test ./

ENTRYPOINT ./test

## test
#!/bin/sh
set -eux -o pipefail

python3 -m venv .venv
. .venv/bin/activate

FLAGS="--no-binary :all: --constraint constraints.txt --requirement constraints.txt"

# Defensively pin prerequisites.
pip install $FLAGS

# If we succeed, install what we actually care about.
pip install $FLAGS python-dateutil==2.7.5
Command	Python	Result
`docker run sddp-350-py3.9`	3.9	✓
`docker run sddp-350-py3.7`	3.7	✗
`docker run -e PIP_CONSTRAINT=constraints.txt sddbp-350-py3.7`	3.7	✓
	FROM python:3.7-alpine

	COPY ./constraints.txt ./
	COPY ./test ./

	ENTRYPOINT ./test
	FROM python:3.9-alpine

	COPY ./constraints.txt ./
	COPY ./test ./

	ENTRYPOINT ./test
	#!/bin/sh
	set -eux -o pipefail

	python3 -m venv .venv
	. .venv/bin/activate

	FLAGS="--no-binary :all: --constraint constraints.txt --requirement constraints.txt"

	# Defensively pin prerequisites.
	pip install $FLAGS

	# If we succeed, install what we actually care about.
	pip install $FLAGS python-dateutil==2.7.5