Pipenv automatically assigns names to the virtual environments based on a hash of the directory where the Pipfile resides. If this directory is moved, then pipenv will no longer find the venv. Not only does the virtual environment (venv) have to be renamed, but all references to it (e.g., in shebangs) must also be updated.

pipenv_migrate

#/usr/bin/env bash

######################################################################
# Pipenv automatically assigns names to the virtual environments     #
# based on a hash of the directory where the Pipfile resides. If     #
# this directory is moved, then pipenv will no longer find the venv. #
# Not only does the virtual environment (venv) have to be renamed,   #
# but all references to it (e.g., in shebangs) must also be updated. #
######################################################################

# get hashed environment name
function get_venv_name() {
    python3 -c "import sys; \
        from pipenv.project import Project; \
        project = Project(); \
        project.s.PIPENV_PIPFILE = '$1/Pipfile'; \
        sys.exit(project.virtualenv_name) \
    " 2>&1 >/dev/null
}

# get base directory for venv (e.g. $HOME/.local/share/virtualenvs)
function get_base() {
    python3 -c "import sys; \
        from pipenv.project import get_workon_home; \
        sys.exit(get_workon_home()) \
    " 2>&1 >/dev/null
}

venv1=$(get_venv_name $1)
venv2=$(get_venv_name $2)
base=$(get_base)
echo Migrating $base/$venv1 to $base/$venv2

# rename venv directory so that pipenv finds it
mv $base/$venv1 $base/$venv2

# update references to new directory
grep -rl $base/$venv2 --exclude-dir site-packages -e $venv1 \
    | xargs sed -i "s/$venv1/$venv2/g"

# update kernelspecs
grep -rl $HOME/.local/share/jupyter/kernels --include *.json -e $venv1 \
    | xargs sed -i "s/$venv1/$venv2/g"

Note that pipenv uses the physical directory (i.e., it does not do any symbolic link tracking). To determine the physical directory with pwd, use the -P option.

For the script to work on MacOS, change sed -i "s/$venv1/$venv2/g" to sed -i "" "s/$venv1/$venv2/g".