Be able to install without Pipfile

[Siecje]

Issue description

I can't install packages with just Pipfile.lock, I also need Pipfile.

During deployment I am doing.

PIP_NO_CACHE_DIR=false PIPENV_VENV_IN_PROJECT=true pipenv install --ignore-pipfile

It returns a 0 status code, creates a Pipfile file but doesn't install any packages.

.venv/bin/python -m pip freeze
# no output

Expected result

All packages in Pipfile.lock are installed. Pipfile file is not created.

Actual result

It returns a 0 status code, creates a Pipfile file but doesn't install any packages.

.venv/bin/python -m pip freeze
# no output

[matteius]

@Siecje pipenv install will try to lock from the Pipfile. What if you replace that part with pipenv sync which installs dependencies from the lock file?

[matteius]

@Siecje I just tested this and it turns out that pipenv sync won't install anything without the Pipfile, maybe because it doesn't know what is a package and what is a dev package without the Pipfile?

[matteius]

@Siecje What is the use case for not including the Pipfile as well during the build process?

[Siecje]

I didn't think I needed it, especially with --ignore-pipfile.

I assumed I only needed the one file when using pipenv.