activate_venv

# run by sourcing (need env for venv)
# source activate_venv

if type -p virtualenv > /dev/null 2>&1; then
    if workon raptiformica > /dev/null 2>&1; then
	# activate the existing virtual env
        echo 'Virtualenv already configured for Raptiformica. It is now activated'
    else
	# set up the virtualen and install the base requirements
        mkvirtualenv -a $(pwd) -p /usr/bin/python3 raptiformica
        echo "PYTHONPATH=`pwd`" >> $VIRTUAL_ENV/bin/postactivate
        pip3 install pip --upgrade
        pip3 install -r requirements/base.txt
    fi;

    # create a symlink to the virtualenv if it does not exist or is not a 
    # symlink to the virtual env but something else (like a copied dir)
    ls -ld .venv | grep -q $VIRTUAL_ENV || ln -fs $VIRTUAL_ENV .venv

    # link helper tools to venv $PATH
    ln -sf `pwd`/misc/snippets/testcase .venv/bin/
else
    # No virtualenv on host system, trying to activate inherited virtualenv from
    # the machine that slaved this machine. Will be overwritten with a link to the
    # real venv once installed. If the system uses a different architecture or the
    # venv does not work for some other reason, fall back to system python3 and
    # hope for the best. 
    echo 'No virtualenv on this system, falling back to pre-synced .venv or system python'
    source .venv/bin/activate || /bin/true
fi;