Upgrade to 2.0.0b0

.gitignore

@@ -10,11 +10,8 @@
 # Python files
 __pycache__/
 *.pyc
-/.venv/
+.venv/
 
 # Editors
 .idea/
 *.iml
-
-# Local databases.
-*.sqlite3

.travis.yml

@@ -26,5 +26,6 @@ script:
   - ./pants binary helloworld/main.py helloworld/main_py2.py
   - ./pants run helloworld/main.py
   - ./pants run helloworld/main_py2.py
-  - ./pants setup-py --args="bdist_wheel" helloworld/util:dist
-  - ./pants awslambda helloworld:helloworld-awslambda
+  # TODO: Fix PEX bug causing these to fail in CI, then reactivate when 2.0.0b1 is released.
+#  - ./pants setup-py --args="bdist_wheel" helloworld/util:dist
+#  - ./pants awslambda helloworld:helloworld-awslambda

build-support/generate_constraints.sh

@@ -0,0 +1,25 @@
+#!/usr/bin/env bash
+# Copyright 2020 Pants project contributors (see CONTRIBUTORS.md).
+# Licensed under the Apache License, Version 2.0 (see LICENSE).
+
+# See https://www.pantsbuild.org/v2.0/docs/python-third-party-dependencies.
+
+set -euo pipefail
+
+PYTHON_BIN=python3
+VIRTUALENV=build-support/.venv
+PIP="${VIRTUALENV}/bin/pip"
+CONSTRAINTS_FILE=constraints.txt
+
+"${PYTHON_BIN}" -m venv "${VIRTUALENV}"
+"${PIP}" install pip --upgrade
+"${PIP}" install -r <(./pants dependencies --type=3rdparty ::)
+echo "# Generated by build-support/generate_constraints.sh on $(date)" > "${CONSTRAINTS_FILE}"
+"${PIP}" freeze --all >> "${CONSTRAINTS_FILE}"
+
+# This example repo includes some Python 2-only code for demonstration. Because we generated
+# the constraints using Python 3.7, we must manually ensure things still work with Python 2.7. So,
+# we warn to the user that they should check the diff. You can delete this if you don't use Python 2.
+echo "Check the diff for ${CONSTRAINTS_FILE} and restore any entries that were specific to" \
+  "Python 2, i.e. entries ending in \`python_version == '2.7'\`. Those are needed for Python 2 to" \
+  "work properly, and this script will overwrite it." 1>&2

constraints.txt

@@ -1,38 +1,36 @@
-# Copyright 2020 Pants project contributors.
-# Licensed under the Apache License, Version 2.0 (see LICENSE).
-
-# Generated by first creating a virtual environment with `python3.7 -m venv .venv`, then running
-# `.venv/bin/pip install -r requirements.txt` and `.venv/bin/pip freeze`.
-
+# Generated by build-support/generate_constraints.sh on Wed Sep 16 11:30:54 MST 2020
 ansicolors==1.1.8
-appdirs==1.4.3
-certifi==2020.4.5.1
+appdirs==1.4.4
+certifi==2020.6.20
 cfgv==2.0.1 ; python_version == '2.7'
 cfgv==3.1.0 ; python_version > '2.7'
 chardet==3.0.4
 click==7.1.2
-distlib==0.3.0
+distlib==0.3.1
 filelock==3.0.12
-identify==1.4.15
-idna==2.9
-importlib-metadata==1.6.0
-importlib-resources==1.5.0 ; python_version < '3.7'
-lxml==4.5.0
-nodeenv==1.3.5
-packaging==20.3
+identify==1.5.2
+idna==2.10
+importlib-metadata==1.7.0
+importlib-resources==3.0.0
+lxml==4.5.2
+nodeenv==1.5.0
+packaging==20.4
+pip==20.2.3
 pluggy==0.13.1
 pre-commit==1.21.0 ; python_version == '2.7'
-pre-commit==2.3.0 ; python_version > '2.7'
-protobuf==3.11.3
-py==1.8.1
+pre-commit==2.7.1 ; python_version > '2.7'
+protobuf==3.13.0
+py==1.9.0
 pyparsing==2.4.7
 PyYAML==5.3.1
-requests==2.23.0
-six==1.14.0
-toml==0.10.0
-tox==3.15.0
+requests==2.24.0
+setuptools==44.1.1 ; python_version == '2.7'
+setuptools==50.3.0 ; python_version > '2.7'
+six==1.15.0
+toml==0.10.1
+tox==3.20.0
 translate==3.5.0
-urllib3==1.25.9
-virtualenv==20.0.20
+urllib3==1.25.10
+virtualenv==20.0.31
 zipp==1.2.0 ; python_version == '2.7'
 zipp==3.1.0 ; python_version > '2.7'

pants.toml

@@ -2,7 +2,7 @@
 # Licensed under the Apache License, Version 2.0 (see LICENSE).
 
 [GLOBAL]
-pants_version = "2.0.0.dev9"
+pants_version = "2.0.0b0"
 pantsd = true  # Enable the Pants daemon for better performance.
 
 backend_packages.add = [
@@ -15,10 +15,17 @@ backend_packages.add = [
   'pants.backend.python.lint.isort',
 ]
 
+# This ensures that the result of `./pants binary` is always unique.
+pants_distdir_legacy_paths = false
+
 [source]
 # The Python source root is the repo root. See https://www.pantsbuild.org/docs/source-roots.
 root_patterns = ["/"]
 
+[subprocess-environment]
+# We pass through these environment variables to subprocesses.
+env_vars = ["LANG", "LC_ALL"]
+
 [python-setup]
 # The default interpreter compatibility for code in this repo. Individual targets can ovverride
 #  this with the `compatibility` field. See