py3-venv wrapper around the gogrepoc script

gogrepoc

#! /bin/bash
# required to work:
#   sudo apt-get install -y python3-venv
# typical test scenario:
#   ./gogrepoc login             # login to GoG and get the auth token
#   ./gogrepoc update            # fetch information and create the manifest
#   ./gogrepoc download -dryrun  # get installers
#   ./gogrepoc verify            # check all the installers for consistency

base=$(dirname $(readlink -f $0))
reqs="$base/requirements.txt"
venv="$base/gogrepoc-venv"
vbin="$venv/bin"
code="$venv/gogrepoc"
repo="https://github.com/Kalanyr/gogrepoc.git"
branch="dev"

#
# preparation part
#
[ ! -d "$reqs" ] || cat >$reqs <<'_EOF_'
html5lib
html2text
requests
pyOpenSSL
_EOF_

if [ ! -d "$venv" ]; then
  python3 -m venv "$venv"
  "$vbin/python3" -m pip install --upgrade pip
  "$vbin/python3" -m pip install -r "$reqs"
fi
[ -d "$code" ] || git clone -b "$branch" "$repo" "$code"

#
# do the work
#
source "$vbin/activate"
"$vbin/python3" "$code/gogrepoc.py" "$@"