generate_contraints

#!/usr/bin/env bash

set -euo pipefail

# You can change these constants.
PYTHON_BIN=python3
VIRTUALENV=build-support/.venv
PIP="${VIRTUALENV}/bin/pip"
REQUIREMENTS_FILE=requirements.txt
CONSTRAINTS_FILE=constraints.txt

"${PYTHON_BIN}" -m venv "${VIRTUALENV}"
"${PIP}" install pip --upgrade
# Install all our requirements.txt, and also any 3rdparty
# dependencies specified outside requirements.txt, e.g. via a
# handwritten python_requirement_library target.
"${PIP}" install \
  -r "${REQUIREMENTS_FILE}" \
  -r <(./pants dependencies :: |
    xargs ./pants filter --target-type=python_requirement |
    xargs ./pants peek |
    jq -r '.[]["requirements"][]')
echo "# Generated by build-support/generate_constraints.sh on $(date)" > "${CONSTRAINTS_FILE}"
"${PIP}" freeze --all >> "${CONSTRAINTS_FILE}"