How to pip install packages written in Pipfile without creating virtualenv?

I created a package, containing Pipfile, and I want to test it with Docker.

I want to install packages listed in Pipfile with pip, without creating virutalenv.

# (do something to create some-file)
RUN pip install (some-file)

How can I do this?

Eventually pip should be able to do this itself, at least that's what they say. Currently, that is not yet implemented.

For now, a Pipfile is a TOML file, so you can use a TOML parser to extract the package constraints and emit them in a format that will be recognized by pip. For example, if your Pipfile contains only simple string version specifiers, this little script will write out a requirements.txt file that you can then pass to pip install -r:

import sys
import toml

with open(sys.argv[1]) as f:
    result = toml.load(f)
for package, constraint in result['packages'].items():
    if constraint == '*':
        print(package)
    else:
        print(f'{package} {constraint}')

If your Pipfile contains more complicated constructs, you'll have to edit this code to account for them.

An alternative that you might consider, which is suitable for a Docker container, is to use pipenv to install the packages into the system Python installation and just remove the generated virtual environment afterwards.

pipenv install --system
pipenv --rm

However, strictly speaking that doesn't achieve your stated goal of doing this without creating a virtualenv.