Reproduce

Tested with pip==21.3.1, all local installs (i.e. clone this repo and run these commands within the folder)

git clone [email protected]:alkasm/test-vcs-offline.git
cd test-vcs-offline
python3 -m venv venv
source venv/bin/activate
pip install pip==21.3.1

Installation online works as expected

pip install .

Installation offline complains that the VCS dep cannot be pulled

Disable network access (e.g. turn off wifi)

pip install .

Installation offline with --no-deps doesn't check that version constraints are satisfied

Note that setup.py requires six==1.15.0, so this install should fail with 1.16.0 installed.

With internet access:

pip install six==1.16.0

Disable network access (e.g. turn off wifi)

pip install --no-deps .

Notice that no error occurs during the installation.

Installation offline with the old resolver does not eagerly install the VCS dep, and does version check

With internet access:

pip install six==1.16.0

Disable network access (e.g. turn off wifi)

pip install --use-deprecated legacy-resolver .

Note that pip errors during the installation, since the version of six does not match the expected version.