updated changelog

2026-06-05 23:10:16 +00:00 · 2017-05-30 11:12:40 -04:00
238 changed files with 23136 additions and 3836 deletions
@@ -1,6 +0,0 @@
 {
  "productTag": "a1aB0000000MR0RIAW",
  "issueTypeLabels": { "gus: story": "USER STORY", "gus: bug": "BUG P3" },
  "defaultBuild": "Heroku Unscheduled",
  "statusWhenClosed": "CLOSED"
 }
@@ -1 +0,0 @@
 * @heroku/languages
@@ -1,8 +0,0 @@
 <!-- Hi and welcome to the Heroku Python buildpack repository!
 If you meant to open a PR against a fork instead of upstream, please adjust the base branch:
 https://help.github.com/articles/changing-the-base-branch-of-a-pull-request/
 Otherwise thank you in advance for your Pull Request - just remember to
 include as much information as possible to help the reviewers :-)
 -->
@@ -1,15 +0,0 @@
 version: 2
 updates:
  - package-ecosystem: "pip"
    directory: "/"
    schedule:
      interval: "weekly"
    labels:
      - "c: dependencies"
  - package-ecosystem: "bundler"
    directory: "/"
    schedule:
      interval: "weekly"
    labels:
      - "c: dependencies"
@@ -1,17 +0,0 @@
 name: Check Changelog
 on:
  pull_request:
    types: [opened, reopened, edited, synchronize]
 jobs:
  check:
    runs-on: ubuntu-latest
    if: |
      !contains(github.event.pull_request.body, '[skip changelog]') &&
      !contains(github.event.pull_request.body, '[changelog skip]') &&
      !contains(github.event.pull_request.body, '[skip ci]')
    steps:
      - uses: actions/checkout@v1
      - name: Check that CHANGELOG is touched
        run: git diff remotes/origin/${{ github.base_ref }} --name-only | grep CHANGELOG.md
@@ -1,14 +1,3 @@
 *.pyc
 site
 .DS_Store
 /.envrc
 repos/*
 #Venv
 buildpack/*
 builds/dockerenv.staging*
 builds/dockerenv.production
 test/scratch
@@ -1,41 +1,9 @@
-language: minimal
+language: bash
-dist: focal
+sudo: required
-branches:
+services:
-  only:
+  - docker
-  - main
+# install: docker pull heroku/cedar:14
-
+script: ./tests.sh
 script:
  - make test STACK="${STACK}" TEST_CMD="${TEST_CMD}"
 jobs:
  include:
  - name: Bash linting (shellcheck)
    script: make check
  - name: Hatchet integration tests
    if: env(HEROKU_API_USER) IS present AND env(HEROKU_API_KEY) IS present
    language: ruby
    rvm:
      - 2.7
    before_script:
      - bundle exec hatchet ci:setup
    script:
      - PARALLEL_SPLIT_TEST_PROCESSES=11 bundle exec parallel_split_test spec/hatchet/
 env:
-  jobs:
+  - STACK=heroku-16
-    - STACK=heroku-16 TEST_CMD=test/run-deps
+  - STACK=cedar-14
    - STACK=heroku-16 TEST_CMD=test/run-versions
    - STACK=heroku-16 TEST_CMD=test/run-features
    - STACK=heroku-18 TEST_CMD=test/run-deps
    - STACK=heroku-18 TEST_CMD=test/run-versions
    - STACK=heroku-18 TEST_CMD=test/run-features
    - STACK=heroku-20 TEST_CMD=test/run-deps
    - STACK=heroku-20 TEST_CMD=test/run-versions
    - STACK=heroku-20 TEST_CMD=test/run-features
  global:
    - HATCHET_RETRIES=3
    - IS_RUNNING_ON_CI=true
    - HATCHET_APP_LIMIT=80
    - HATCHET_DEPLOY_STRATEGY=git
@@ -1,409 +1,6 @@
 # Python Buildpack Changelog
-## Unreleased
+# 104
 - Python 3.8.7 is now available (CPython) (#1122).
 ## v186 (2020-11-18)
 - Update the `BUILD_WITH_GEO_LIBRARIES` error message (#1121).
 - Switch NLTK feature detection away from `sp-grep` (#1119).
 - Switch Django collectstatic feature detection away from `sp-grep` (#1119).
 - Remove vendored `sp-grep` script (#1119).
 - Remove vendored `pip-diff` script (#1118).
 - Remove vendored `pip-grep` script (#1116).
 ## v185 (2020-11-12)
 - Error if the unsupported `BUILD_WITH_GEO_LIBRARIES` env var is set (#1115).
 - Remove deprecated GDAL/GEOS/PROJ support (#1113).
 - Remove vendored `jq` binary (#1112).
 - Remove redundant Mercurial install step (#1111).
 - Remove support for the Cedar-14 stack (#1110).
 ## v184 (2020-10-21)
 - Vendor buildpack-stdlib instead of fetching from S3 (#1100).
 - Fix metric names for metrics emitted within `sub_env` (#1099).
 ## v183 (2020-10-12)
 - Add support for Heroku-20 (#968).
 ## v182 (2020-10-06)
 - Python 3.9.0 is now available (CPython) (#1090).
 - Migrate from the `lang-python` S3 bucket to `heroku-buildpack-python` (#1089).
 - Remove `vendor/shunit2` (#1086).
 - Replace `BUILDPACK_VENDOR_URL` and `USE_STAGING_BINARIES` with `BUILDPACK_S3_BASE_URL` (#1085).
 ## v181 (2020-09-29)
 - PyPy 2.7 and 3.6, version 7.3.2 are now available (Note: PyPy support is in beta) (#1081).
 ## v180 (2020-09-24)
 - Python 3.8.6 is now available (CPython) (#1072).
 ## v179 (2020-09-23)
 - Remove duplicate pipenv metric event (#1070).
 - Emit metrics for how the Python version was chosen for an app (#1069).
 - Emit Python version metric events for all builds, not just clean installs (#1066).
 ## v178 (2020-09-07)
 - Python 3.5.10 is now available (CPython) (#1062).
 ## v177 (2020-08-18)
 - Python 3.6.12 and 3.7.9 are now available (CPython) (#1054).
 - The default Python version for new apps is now 3.6.12 (previously 3.6.11) (#1054).
 ## v176 (2020-08-12)
 - Rebuild the Python 3.4.10 archives with the correct version of Python (#1048).
 - Fix the security update version check message for apps using PyPy (#1040).
 - Remove `vendor/test-utils` (#1043).
 ## v175 (2020-08-05)
 - Update pip from 20.0.2 to 20.1.1 for Python 2.7 and Python 3.5+ (#1030).
 - Update setuptools from 39.0.1 to: (#1024)
  - 44.1.1 for Python 2.7
  - 43.0.0 for Python 3.4
  - 47.1.1 for Python 3.5+
 - Switch the `heroku-buildpack-python` repository default branch from `master` to `main` (#1029).
 ## v174 (2020-07-30)
 - For repeat builds, also manage the installed versions of setuptools/wheel, rather than just that of pip (#1007).
 - Install an explicit version of wheel rather than the latest release at the time (#1007).
 - Output the installed version of pip, setuptools and wheel in the build log (#1007).
 - Errors installing pip/setuptools/wheel are now displayed in the build output and fail the build early (#1007).
 - Install pip using itself rather than `get-pip.py` (#1007).
 - Disable pip's version check + cache when installing pip/setuptools/wheel (#1007).
 - Install setuptools from PyPI rather than a vendored copy (#1007).
 - Reduce the number of environment variables exposed to `bin/{pre,post}_compile` and other subprocesses (#1011).
 ## v173 (2020-07-21)
 - Python 3.8.5 is now available (CPython).
 ## v172 (2020-07-17)
 - Python 3.8.4 is now available (CPython).
 ## v171 (2020-07-07)
 - Python 3.6.11 and 3.7.8 are now available (CPython).
 ## v170 (2020-05-19)
 - Python 2.7.18, 3.5.9, 3.7.7 and 3.8.3 are now available (CPython).
 - PyPy 2.7 and 3.6, version 7.3.1 are now available (Note: PyPy support is in beta).
 - Docs: Fix explanation of runtime.txt generation when using pipenv.
 - Bugfix: Correctly detect Python version when using a `python_version` of `3.8` in `Pipfile.lock`.
 ## v169 (2020-04-22)
 - Add a Hatchet test for python 3.8.2
 - Set Code Owners to @heroku/langauges
 - Bugfix: Caching on subsequent redeploys
 - Update tests to support latest version of Python
 ## v168 (2020-04-06)
 - Doc: Update Readme with version numbers
 - update Code Owners to include the Heroku Buildpack Maintainers team
 - Deprecation warning: `BUILD_WITH_GEO_LIBRARIES` is now deprecated. See warning for details.
 - Clean up build log output
 - Update Python versions in README to match docs
 - Django version detection fixed, link updated
 ## v167 (2020-03-26)
 - Add failcase for cache busting
 - Bugfix: Clearing pip dependencies
 ## v166 (2020-03-05)
 - Correct ftp to https in vendored file
 - Warn for Django 1.11 approaching EOL, provide link to roadmap
 ## v165 (2020-02-27)
 - Python 3.8.2 now available.
 ## v164 (2020-02-20)
 - Update requirements.txt builds to use Pip 20.0.2
 - Download get-pip.py to tmpdir instead of root dir
 ## v163 (2019-12-23)
 - New pythons released:
  Python 3.8.1, 3.7.6, 3.6.10 (CPython)
  Beta Release: Pypy 2.7 and 3.6, version 7.2.0
 ## v162 (2019-12-06)
 - Bug fix: fragile sqlite3 install
 ## v161 (2019-12-2)
 - Bug fix: Sqlite3 version bump
 ## v160 (2019-10-23)
 - Bugfix: Pipenv no longer installs twice in CI
 ## v159 (2019-10-22)
 - Python 2.7.17 now available on Heroku 18 and 16.
 ## v158 (2019-10-21)
 - Python 3.7.5 and 3.8.0 now available on Heroku 18 and 16.
 - Add support for Python 3.8 branch
 - Sqlite3 Update:
  - Test Improvements
 - Add support for staging binary testing
 ## v157 (2019-09-18)
 - Typo fixes
 ## v156 (2019-09-12)
 - Python 3.6.9 and 3.7.4 now available.
 - Move get-pip utility to S3
 - Build utility and documentation updates
 - Bump Hatchet tests to point at new default python version.
 ## v155 (2019-08-22)
 add docs and make target for heroku-18 bob builds
 ## v154 (2019-07-17)
 Fix python 3.5.7 formula actually building 3.7.2
 ## v153 (2019-06-21)
 Hotfix for broken heroku-16 deploys
 ## v152 (2019-04-04)
 Python 3.7.3 now available.
 ## v151 (2019-03-21)
 Python 3.5.7 and 3.4.10 now available on all Heroku stacks.
 ## v150 (2019-03-13)
 Python 2.7.16 now available on all Heroku stacks.
 ## v149 (2019-03-04)
 Hotfix for broken Cedar 14 deploys
 ## v148 (2019-02-21)
 No user facing changes, improving internal metrics
 ## v147 (2019-02-07)
 Python 3.7.2 and 3.6.8 now available on all Heroku stacks.
 ## v146 (2018-11-11)
 Python 3.7.1, 3.6.7, 3.5.6 and 3.4.9 now available on all Heroku stacks.
 ## v145 (2018-11-08)
 Testing and tooling expanded to better support new runtimes
 ## v144 (2018-10-10)
 Switch to cautious upgrade for Pipenv install to ensure the pinned pip version
 is used with Pipenv
 ## v143 (2018-10-09)
 Add support for detecting `SLUGIFY_USES_TEXT_UNIDECODE`, which is required to
 install Apache Airflow version 1.10 or higher.
 ## v142 (2018-10-08)
 Improvements to Python install messaging
 ## v139, 140, 141
 No user-facing changes, documenting for version clarity
 ## v138 (2018-08-01)
 Use stack image SQLite3 instead of vendoring
 ## v137 (2018-07-17)
 Prevent 3.7.0 from appearing as unsupported in buildpack messaging.
 ## v136 (2018-06-28)
 Upgrade to 3.6.6 and support 3.7.0 on all runtimes.
 ## v135 (2018-05-29)
 Upgrade Pipenv to v2018.5.18.
 ## v134 (2018-05-02)
 Default to 3.6.5, bugfixes.
 ## v133
 Fixes for Pip 10 release.
 ## v132
 Improve pip installation, with the release of v9.0.2.
 ## v131
 Fix bug with pip.
 ## v130
 Better upgrade strategy for pip.
 ## v129
 Don't upgrade pip (from v128).
 ## v128
 Upgrade pip, pin to Pipenv v11.8.2.
 ## v127
 Pin to Pipenv v11.7.1.
 ## v126
 Bugfixes.
 ## v125
 Bugfixes.
 ## v124
 Update buildpack to automatically install `[dev-packages]` during Heroku CI Pipenv builds.
 - Skip installs if Pipfile.lock hasn't changed, and uninstall stale dependencies with Pipenv.
 - Set `PYTHONPATH` during collectstatic runs.
 - No longer warn if there is no `Procfile`.
 - Update Pipenv's "3.6" runtime specifier to point to "3.6.4".
 ## v123
 Update gunicorn `init.d` script to allow overrides.
 ## v122
 Update default Python to v3.6.4.
 ## v121
 Update default Python to v3.6.3.
 ## v120
 Use `$ pipenv --deploy`.
 ## v119
 Improvements to Pipenv support, warning on unsupported Python versions.
 - We now warn when a user is not using latest 2.x or 3.x Python.
 - Heroku now supports `[requires]` `python_full_version` in addition to `python_version`.
 ## v118
 Improvements to Pipenv support.
 ## v117
 Bug fix.
 ## v116
 Vendoring improvements.
 - Geos libraries should work on Heroku-16 now.
 - The libffi/libmemcached vendoring step is now skipped on Heroku-16 (since they are installed in the base image).
 ## v115
 Revert a pull request.
 - No longer using `sub_env` for `pip install` step.
 ## v114
 - Bugfixes.
 Blacklisting `PYTHONHOME` and `PYTHONPATH` for older apps. Upgrades to nltk support.
 ## v113
 Updates to Pipenv support.
 ## v112
 Bugfix.
 - Fixed grep output bug.
 ## v111
 Linting, bugfixes.
 ## v110
 Update default Python to 3.6.2.
 ## v109
 Update Default Python to 3.6.1, bugfixes.
 - Fixed automatic pip uninstall of dependencies removed from requirements.txt.
 ## v108
 Fix output for collectstatic step.
 ## v107
 Bugfix for C dependency installation.
 ## v106
 Don't install packages that could mess up packaging.
 - The Python buildpack will automatically remove `six`, `pyparsing`, `appdirs`,
   `setuptools`, and `distribute` from a `requirements.txt` file now, as these
   packages are provided by the Python buildpack.
 ## v105
 Improvements to output messaging.
 ## v104
 General improvements.
@@ -413,52 +10,52 @@ General improvements.
 [395]: https://github.com/heroku/heroku-buildpack-python/pull/395
-## v103
+## 103
 Bug fixes and improvements.
 - Fix for Pipenv.
 - Fix for Heroku CI.
- Improve handling of `WEB_CONCURRENCY` when using multiple buildpacks.
+- Improve handling of WEB_CONCURRENCY when using multiple buildpacks.
- Adjust environment variables set during the build to more closely match those in the dyno environment (`DYNO` is now available, `STACK` is not).
+- Adjust environment variables set during the build to more closely match those in the dyno environment (DYNO is now available, STACK is not).
 - Restore the build cache prior to running bin/pre_compile.
-## v102
+## 102
 Buildpack code cleanup.
 - Improved messaging around NLTK.
-## v101
+## 101
 Updated setuptools installation method.
 - Improved pipenv support.
-## v100
+## 100
 Preliminary pipenv support.
-## v99
+## 99
 Cleanup.
-## v98
+## 98
 Official NLTK support and other improvements.
 - Support for `nltk.txt` file for declaring corpora to be downloaded.
- Leading zeros for auto-set `WEB_CONCURRENCY`.
+- Leading zeros for auto-set WEB_CONCURRENCY.
-## v97
+## 97
 Improved egg-link functionality.
-## v96
+## 96
 Bugfix.
-## v95
+## 95
 Improved output support.
@@ -494,7 +91,7 @@ Fixed bug with editable pip installations.
 Updated default Python 2.7.13.
- Python 2.7.13 uses UCS-4 build, more compatible with linux wheels.
+- Python 2.7.13 uses UCS-4 build, more compatibile with linux wheels.
 - Updated setuptools to v32.1.0.
 ## v86
@@ -520,7 +117,7 @@ Support for Heroku CI.
 ## v82 (2016-08-22)
-Update to library detection mechanisms (pip-pop).
+Update to library detection mechnisms (pip-pop).
 - Updated setuptools to v25.5.0
@@ -594,7 +191,7 @@ Revert to v66.
 ## v68 (2015-10-12)
-Fixed `.heroku/venv` error with modern apps.
+Fixed .heroku/venv error with modern apps.
 ## v67 (2015-10-12)
@@ -619,6 +216,7 @@ Updated Pip and Setuptools.
 - Setuptools updated to v18.3.2
 - Pip updated to v7.1.2
 ## v62 (2015-08-07)
 Updated Pip and Setuptools.
@@ -0,0 +1,13 @@
 FROM heroku/heroku:16-build
 WORKDIR /app
 ENV WORKSPACE_DIR="/app/builds" \
    S3_BUCKET="lang-python" \
    S3_PREFIX="heroku-16/"
 RUN apt-get update && apt-get install -y python-pip && rm -rf /var/lib/apt/lists/*
 COPY requirements.txt /app/
 RUN pip install --disable-pip-version-check --no-cache-dir -r /app/requirements.txt
 COPY . /app
@@ -1,8 +0,0 @@
 source "https://rubygems.org"
 gem "rspec"
 gem "heroku_hatchet"
 gem "rspec-retry"
 gem "rake"
 gem "parallel_split_test"
@@ -1,60 +0,0 @@
 GEM
  remote: https://rubygems.org/
  specs:
    diff-lcs (1.4.4)
    erubis (2.7.0)
    excon (0.78.0)
    heroics (0.1.1)
      erubis (~> 2.0)
      excon
      moneta
      multi_json (>= 1.9.2)
    heroku_hatchet (7.3.3)
      excon (~> 0)
      platform-api (~> 3)
      rrrretry (~> 1)
      thor (~> 1)
      threaded (~> 0)
    moneta (1.0.0)
    multi_json (1.15.0)
    parallel (1.19.2)
    parallel_split_test (0.8.0)
      parallel (>= 0.5.13)
      rspec (>= 3.1.0)
    platform-api (3.0.0)
      heroics (~> 0.1.1)
      moneta (~> 1.0.0)
      rate_throttle_client (~> 0.1.0)
    rake (13.0.1)
    rate_throttle_client (0.1.2)
    rrrretry (1.0.0)
    rspec (3.10.0)
      rspec-core (~> 3.10.0)
      rspec-expectations (~> 3.10.0)
      rspec-mocks (~> 3.10.0)
    rspec-core (3.10.0)
      rspec-support (~> 3.10.0)
    rspec-expectations (3.10.0)
      diff-lcs (>= 1.2.0, < 2.0)
      rspec-support (~> 3.10.0)
    rspec-mocks (3.10.0)
      diff-lcs (>= 1.2.0, < 2.0)
      rspec-support (~> 3.10.0)
    rspec-retry (0.6.2)
      rspec-core (> 3.3)
    rspec-support (3.10.0)
    thor (1.0.1)
    threaded (0.0.4)
 PLATFORMS
  ruby
 DEPENDENCIES
  heroku_hatchet
  parallel_split_test
  rake
  rspec
  rspec-retry
 BUNDLED WITH
   2.1.4
@@ -1,6 +1,6 @@
 MIT License:
-Copyright (C) 2017 Heroku, Inc.
+Copyright (C) 2016 Heroku, Inc.
 Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
@@ -1,61 +1,32 @@
 # These targets are not files
-.PHONY: check test compile builder-image buildenv deploy-runtimes tools
+.PHONY: tests
-STACK ?= heroku-18
+test: test-cedar-14
 STACKS ?= heroku-16 heroku-18 heroku-20
 TEST_CMD ?= test/run-versions && test/run-features && test/run-deps
 FIXTURE ?= test/fixtures/requirements-standard
 ENV_FILE ?= builds/dockerenv.default
 BUILDER_IMAGE_PREFIX := heroku-python-build
-# Converts a stack name of `heroku-NN` to its build Docker image tag of `heroku/heroku:NN-build`.
+test-cedar-14:
-STACK_IMAGE_TAG := heroku/$(subst -,:,$(STACK))-build
+	@echo "Running tests in docker (cedar-14)..."
 	@docker run -v $(shell pwd):/buildpack:ro --rm -it -e "STACK=cedar-14" heroku/cedar:14 bash -c 'cp -r /buildpack /buildpack_test; cd /buildpack_test/; test/run;'
 	@echo ""
-check:
+test-heroku-16:
-	@shellcheck -x bin/compile bin/detect bin/release bin/test-compile bin/utils bin/warnings bin/default_pythons
+	@echo "Running tests in docker (heroku-16)..."
-	@shellcheck -x bin/steps/collectstatic bin/steps/eggpath-fix  bin/steps/eggpath-fix2 bin/steps/nltk bin/steps/pip-install bin/steps/pipenv bin/steps/pipenv-python-version bin/steps/python
+	@docker run -v $(shell pwd):/buildpack:ro --rm -it -e "STACK=heroku-16" heroku/heroku:16-build bash -c 'cp -r /buildpack /buildpack_test; cd /buildpack_test/; test/run;'
-	@shellcheck -x bin/steps/hooks/*
+	@echo ""
-test:
+buildenv-heroku-16:
-	@echo "Running tests using: STACK=$(STACK) TEST_CMD='$(TEST_CMD)'"
+	@echo "Creating build environment (heroku-16)..."
 	@echo
-	@docker run --rm -it -v $(PWD):/buildpack:ro -e "STACK=$(STACK)" "$(STACK_IMAGE_TAG)" bash -c 'cp -r /buildpack /buildpack_test && cd /buildpack_test && $(TEST_CMD)'
+	@docker build --pull -t python-buildenv-heroku-16 .
 	@echo
 compile:
 	@echo "Running compile using: STACK=$(STACK) FIXTURE=$(FIXTURE)"
 	@echo
 	@docker run --rm -it -v $(PWD):/src:ro -e "STACK=$(STACK)" -w /buildpack "$(STACK_IMAGE_TAG)" \
 		bash -c 'cp -r /src/{bin,vendor} /buildpack && cp -r /src/$(FIXTURE) /build && mkdir /cache /env && bin/compile /build /cache /env'
 	@echo
 builder-image:
 	@echo "Generating binary builder image for $(STACK)..."
 	@echo
 	@docker build --pull -f builds/$(STACK).Dockerfile -t "$(BUILDER_IMAGE_PREFIX)-$(STACK)" .
 	@echo
 buildenv: builder-image
 	@echo "Starting build environment for $(STACK)..."
 	@echo
 	@echo "Usage..."
 	@echo
-	@echo "  $$ bob build runtimes/python-X.Y.Z"
+	@echo "  $$ export AWS_ACCESS_KEY_ID=foo AWS_SECRET_ACCESS_KEY=bar  # Optional unless deploying"
 	@echo "  $$ bob build runtimes/python-2.7.13"
 	@echo "  $$ bob deploy runtimes/python-2.7.13"
 	@echo
-	@docker run --rm -it --env-file="$(ENV_FILE)" -v $(PWD)/builds:/app/builds "$(BUILDER_IMAGE_PREFIX)-$(STACK)" bash
+	@docker run -it --rm python-buildenv-heroku-16
-deploy-runtimes:
+tools:
-ifndef RUNTIMES
+	git clone https://github.com/kennethreitz/pip-pop.git
-	$(error No runtimes specified! Use: "make deploy-runtimes RUNTIMES='python-X.Y.Z ...' [STACKS='heroku-18 ...'] [ENV_FILE=...]")
+	mv pip-pop/bin/* vendor/pip-pop/
-endif
+	rm -fr pip-pop
 	@echo "Using: RUNTIMES='$(RUNTIMES)' STACKS='$(STACKS)' ENV_FILE='$(ENV_FILE)'"
 	@echo
 	@set -eu; for stack in $(STACKS); do \
 		$(MAKE) builder-image STACK=$${stack}; \
 		for runtime in $(RUNTIMES); do \
 			echo "Generating/deploying $${runtime} for $${stack}..."; \
 			echo; \
 			docker run --rm -it --env-file="$(ENV_FILE)" "$(BUILDER_IMAGE_PREFIX)-$${stack}" bob deploy "runtimes/$${runtime}"; \
 			echo; \
 		done; \
 	done
@@ -1,5 +1,27 @@
 This buildpack includes some vendorized packages to ease installation.
 jq license
 ----------
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
 in the Software without restriction, including without limitation the rights
 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 copies of the Software, and to permit persons to whom the Software is
 furnished to do so, subject to the following conditions:
 The above copyright notice and this permission notice shall be included in all
 copies or substantial portions of the Software.
 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 shunit2 license
 ---------------
@@ -63,3 +85,53 @@ The Free Software Foundation may publish revised and/or new versions of the GNU
 Each version is given a distinguishing version number. If the Library as you received it specifies that a certain numbered version of the GNU Lesser General Public License “or any later version” applies to it, you have the option of following the terms and conditions either of that published version or of any later version published by the Free Software Foundation. If the Library as you received it does not specify a version number of the GNU Lesser General Public License, you may choose any version of the GNU Lesser General Public License ever published by the Free Software Foundation.
 If the Library as you received it specifies that a proxy can decide whether future versions of the GNU Lesser General Public License shall apply, that proxy's public statement of acceptance of any version is permanent authorization for you to choose that version for the Library.
 get-pip.py license
 ------------------
 Copyright (c) 2008-2016 The pip developers (see AUTHORS.txt file)
 Permission is hereby granted, free of charge, to any person obtaining
 a copy of this software and associated documentation files (the
 "Software"), to deal in the Software without restriction, including
 without limitation the rights to use, copy, modify, merge, publish,
 distribute, sublicense, and/or sell copies of the Software, and to
 permit persons to whom the Software is furnished to do so, subject to
 the following conditions:
 The above copyright notice and this permission notice shall be
 included in all copies or substantial portions of the Software.
 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 pip-pop license
 ---------------
 The MIT License (MIT)
 Copyright (c) 2014 Kenneth Reitz.
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
 in the Software without restriction, including without limitation the rights
 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 copies of the Software, and to permit persons to whom the Software is
 furnished to do so, subject to the following conditions:
 The above copyright notice and this permission notice shall be included in
 all copies or substantial portions of the Software.
 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 THE SOFTWARE.
@@ -2,57 +2,40 @@
 # Heroku Buildpack: Python
-[![Build Status](https://travis-ci.com/heroku/heroku-buildpack-python.svg?branch=main)](https://travis-ci.com/heroku/heroku-buildpack-python)
+[![Build Status](https://travis-ci.org/heroku/heroku-buildpack-python.svg?branch=master)](https://travis-ci.org/heroku/heroku-buildpack-python)
-This is the official [Heroku buildpack](https://devcenter.heroku.com/articles/buildpacks) for Python apps.
+This is the official [Heroku buildpack](https://devcenter.heroku.com/articles/buildpacks) for Python apps, powered by [pip](https://pip.pypa.io/) and other excellent software.
-Recommended web frameworks include **Django** and **Flask**, among others. The recommended webserver is **Gunicorn**. There are no restrictions around what software can be used (as long as it's pip-installable). Web processes must bind to `$PORT`, and only the HTTP protocol is permitted for incoming connections.
+Recommended web frameworks include **Django** and **Flask**. The recommended webserver is **Gunicorn**. There are no restrictions around what software can be used (as long as it's pip-installable). Web processes must bind to `$PORT`, and only the HTTP protocol is permitted for incoming connections.
-Python packages with C dependencies that are not [available on the stack image](https://devcenter.heroku.com/articles/stack-packages) are generally not supported, unless `manylinux` wheels are provided by the package maintainers (common). For recommended solutions, check out [this article](https://devcenter.heroku.com/articles/python-c-deps) for more information.
+Some Python packages with obscure C dependencies (e.g. scipy) are [not compatible](https://devcenter.heroku.com/articles/python-c-deps).
 See it in Action
 ----------------
 ```
 $ ls
 my-application		requirements.txt	runtime.txt
-$ git push heroku main
+Deploying a Python application couldn't be easier:
 Counting objects: 4, done.
 Delta compression using up to 8 threads.
 Compressing objects: 100% (2/2), done.
 Writing objects: 100% (4/4), 276 bytes | 276.00 KiB/s, done.
 Total 4 (delta 0), reused 0 (delta 0)
 remote: Compressing source files... done.
 remote: Building source:
 remote:
 remote: -----> Python app detected
 remote: -----> Installing python
 remote: -----> Installing pip
 remote: -----> Installing SQLite3
 remote: -----> Installing requirements with pip
 remote:        Collecting flask (from -r /tmp/build_c2c067ef79ff14c9bf1aed6796f9ed1f/requirements.txt (line 1))
 remote:          Downloading ...
 remote:        Installing collected packages: Werkzeug, click, MarkupSafe, Jinja2, itsdangerous, flask
 remote:        Successfully installed Jinja2-2.10 MarkupSafe-1.1.0 Werkzeug-0.14.1 click-7.0 flask-1.0.2 itsdangerous-1.1.0
 remote:
 remote: -----> Discovering process types
 remote:        Procfile declares types -> (none)
 remote:
 ```
-A `requirements.txt` must be present at the root of your application's repository to deploy.
+    $ ls
    Procfile  requirements.txt  web.py
-To specify your python version, you also need a `runtime.txt` file - unless you are using the default Python runtime version.
+    $ heroku create --buildpack heroku/python
-Current default Python Runtime: Python 3.6.12
+    $ git push heroku master
    ...
    -----> Python app detected
    -----> Installing python-2.7.13
         $ pip install -r requirements.txt
           Collecting requests (from -r requirements.txt (line 1))
             Downloading requests-2.12.4-py2.py3-none-any.whl (576KB)
           Installing collected packages: requests
           Successfully installed requests-2.12.4
-Alternatively, you can provide a `setup.py` file, or a `Pipfile`.
+    -----> Discovering process types
-Using `pipenv` will generate `runtime.txt` at build time if one of the field `python_version` or `python_full_version` is specified in the `requires` section of your `Pipfile`.
+           Procfile declares types -> (none)
-Specify a Buildpack Version
+A `requirements.txt` file must be present at the root of your application's repository.
 ---------------------------
-You can specify the latest production release of this buildpack for upcoming builds of an existing application:
+You can also specify the latest production release of this buildpack for upcoming builds of an existing application:
    $ heroku buildpacks:set heroku/python
@@ -60,37 +43,14 @@ You can specify the latest production release of this buildpack for upcoming bui
 Specify a Python Runtime
 ------------------------
-Supported runtime options include:
+Specific versions of the Python runtime can be specified with a `runtime.txt` file:
- `python-3.9.0`
+    $ cat runtime.txt
- `python-3.8.7`
+    python-3.6.1
 - `python-3.7.9`
 - `python-3.6.12`
 - `python-2.7.18`
-## Tests
+Runtime options include:
-The buildpack tests use [Docker](https://www.docker.com/) to simulate
+- `python-2.7.13`
-Heroku's [stack images.](https://devcenter.heroku.com/articles/stack)
+- `python-3.6.1`
-
+- `pypy-5.7.1` (unsupported, experimental)
-To run the test suite against the default stack:
+- `pypy3-5.5.1` (unsupported, experimental)
 ```
 make test
 ```
 Or to test against a particular stack:
 ```
 make test STACK=heroku-16
 ```
 To run only a subset of the tests:
 ```
 make test TEST_CMD=tests/versions
 ```
 The tests are run via the vendored
 [shunit2](https://github.com/kward/shunit2)
 test framework.
@@ -1 +0,0 @@
 require 'hatchet/tasks'
@@ -15,117 +15,56 @@
 # Fail fast and fail hard.
 set -eo pipefail
-# Used by buildpack-stdlib's metrics features.
+# Standard Library.
 export BPLOG_PREFIX="buildpack.python"
 export BUILDPACK_LOG_FILE=${BUILDPACK_LOG_FILE:-/dev/null}
 [ "$BUILDPACK_XTRACE" ] && set -o xtrace
-# Prepend proper path for old-school virtualenv hackery.
+# Prepend proper path for virtualenv hackery. This will be deprecated soon.
 # This may not be neccessary.
 export PATH=:/usr/local/bin:$PATH
-# Setup Path variables, for later use in the Buildpack.
+# Paths.
-BIN_DIR=$(cd "$(dirname "$0")"; pwd) # absolute path
+BIN_DIR=$(cd $(dirname $0); pwd) # absolute path
-ROOT_DIR=$(dirname "$BIN_DIR")
+ROOT_DIR=$(dirname $BIN_DIR)
 BUILD_DIR=$1
 CACHE_DIR=$2
 ENV_DIR=$3
-# Export Path variables, for use in sub-scripts.
+# Python defaults
-export BUILD_DIR CACHE_DIR ENV_DIR
+DEFAULT_PYTHON_VERSION="python-2.7.13"
 DEFAULT_PYTHON_STACK="cedar-14"
 PYTHON_EXE="/app/.heroku/python/bin/python"
 PIP_VERSION="9.0.1"
 SETUPTOOLS_VERSION="32.1.0"
-# Set the base URL for downloading buildpack assets like Python runtimes.
+# Common Problem Warnings
-# The user can provide BUILDPACK_S3_BASE_URL to specify a custom target.
+export WARNINGS_LOG=$(mktemp)
-# Note: this is designed for non-Heroku use, as it does not use the user-provided
+export RECOMMENDED_PYTHON_VERSION=$DEFAULT_PYTHON_VERSION
 # environment variable mechanism (the ENV_DIR).
 S3_BASE_URL="${BUILDPACK_S3_BASE_URL:-"https://heroku-buildpack-python.s3.amazonaws.com"}"
 # This has to be exported since it's used by the geo-libs step which is run in a subshell.
-# Default Python Versions
+# Setup vendored tools and pip-pop (pip-diff)
-# shellcheck source=bin/default_pythons
+export PATH=$PATH:$ROOT_DIR/vendor/:$ROOT_DIR/vendor/pip-pop
 source "$BIN_DIR/default_pythons"
-# Supported Python Branches
+# Support Anvil Build_IDs
-PY39="python-3.9"
+[ ! "$SLUG_ID" ] && SLUG_ID="defaultslug"
-PY38="python-3.8"
+[ ! "$REQUEST_ID" ] && REQUEST_ID=$SLUG_ID
 PY37="python-3.7"
 PY36="python-3.6"
 PY35="python-3.5"
 PY34="python-3.4"
 PY27="python-2.7"
 PYPY27="pypy2.7"
 PYPY36="pypy3.6"
 # Which stack is used (for binary downloading), if none is provided (e.g. outside of Heroku)?
 # TODO: Remove this and require that STACK be set explicitly.
 DEFAULT_PYTHON_STACK="heroku-18"
 # Common Problem Warnings:
 # This section creates a temporary file in which to stick the output of `pip install`.
 # The `warnings` subscript then greps through this for common problems and guides
 # the user towards resolution of known issues.
 WARNINGS_LOG=$(mktemp)
 RECOMMENDED_PYTHON_VERSION=$DEFAULT_PYTHON_VERSION
 # The buildpack ships with a few executable tools.
 # This installs them into the path, so we can execute them directly.
 export PATH=$PATH:$ROOT_DIR/vendor/
 # Set environment variables if they weren't set by the platform.
 [ ! "$STACK" ] && STACK=$DEFAULT_PYTHON_STACK
-# Sanitize externally-provided environment variables:
+# Sanitizing environment variables.
-# The following environment variables are either problematic or simply unneccessary
+unset GIT_DIR PYTHONHOME PYTHONPATH
-# for the buildpack to have knowledge of, so we unset them, to keep the environment
+unset RECEIVE_DATA RUN_KEY BUILD_INFO DEPLOY LOG_TOKEN
-# as clean and pristine as possible.
+unset CYTOKINE_LOG_FILE GEM_PATH
 unset PYTHONHOME PYTHONPATH
-# Import the utils script, which contains helper functions used throughout the buildpack.
+# Syntax sugar.
-# shellcheck source=bin/utils
+source $BIN_DIR/utils
 source "$BIN_DIR/utils"
-# Import the warnings script, which contains the `pip install` user warning mechanisms
+# Import collection of warnings.
-# (mentioned and explained above)
+source $BIN_DIR/warnings
 # shellcheck source=bin/warnings
 source "$BIN_DIR/warnings"
-if [[ "${STACK}" == "cedar-14" ]]; then
+# we need to put a bunch of symlinks in there later
  mcount "failure.unsupported.cedar-14"
  puts-warn "The Cedar-14 stack is no longer supported by the latest release of this buildpack."
  puts-warn
  puts-warn "Please switch to the Cedar-14 support branch by using this buildpack URL:"
  puts-warn "https://github.com/heroku/heroku-buildpack-python#cedar-14"
  puts-warn
  puts-warn "For instructions on how to change the buildpacks used by an app, see:"
  puts-warn "https://devcenter.heroku.com/articles/buildpacks#setting-a-buildpack-on-an-application"
  exit 1
 fi
 if [[ -f "${ENV_DIR}/BUILD_WITH_GEO_LIBRARIES" ]]; then
  mcount "failure.unsupported.BUILD_WITH_GEO_LIBRARIES"
  puts-warn "The Python buildpack's legacy BUILD_WITH_GEO_LIBRARIES functonality is"
  puts-warn "no longer supported:"
  puts-warn "https://devcenter.heroku.com/changelog-items/1947"
  puts-warn
  puts-warn "To continue to use GDAL, GEOS or PROJ support, see the migration guide:"
  puts-warn "https://help.heroku.com/D5INLB1A/python-s-build_with_geo_libraries-legacy-feature-is-no-longer-supported"
  puts-warn
  puts-warn "Or if you no longer need those libraries, this message can be hidden by"
  puts-warn "unsetting the BUILD_WITH_GEO_LIBRARIES environment variable, using:"
  puts-warn "heroku config:unset BUILD_WITH_GEO_LIBRARIES"
  exit 1
 fi
 # Make the directory in which we will create symlinks from the temporary build directory
 # to `/app`.
 # Symlinks are required, since Python is not a portable installation.
 # More on this topic later.
 mkdir -p /app/.heroku
-# This buildpack programatically generates (or simply copies) a number of files for
+# Set up outputs under new context
 # buildpack machinery: an export script, and a number of `.profile.d` scripts. This
 # section declares the locations of those files and targets.
 PROFILE_PATH="$BUILD_DIR/.profile.d/python.sh"
 EXPORT_PATH="$BIN_DIR/../export"
 GUNICORN_PROFILE_PATH="$BUILD_DIR/.profile.d/python.gunicorn.sh"
@@ -134,245 +73,174 @@ WEB_CONCURRENCY_PROFILE_PATH="$BUILD_DIR/.profile.d/WEB_CONCURRENCY.sh"
 # We'll need to send these statics to other scripts we `source`.
 export BUILD_DIR CACHE_DIR BIN_DIR PROFILE_PATH EXPORT_PATH
-# Python Environment Variables
+# Prepend proper environment variables for Python use.
 # Set Python-specific environment variables, for running Python within the buildpack.
 # Notes on each variable included.
 # PATH is relatively obvious, we need to be able to execute 'python'.
 export PATH=/app/.heroku/python/bin:/app/.heroku/vendor/bin:$PATH
 # Tell Python to not buffer it's stdin/stdout.
 export PYTHONUNBUFFERED=1
 # Set the locale to a well-known and expected standard.
 export LANG=en_US.UTF-8
 # `~/.heroku/vendor` is an place where the buildpack may stick pre-build binaries for known
 # C dependencies. This section configures Python (GCC, more specifically)
 # and pip to automatically include these paths when building binaries.
 # TODO: Stop adding .heroku/vendor here now that the buildpack no longer vendors anything.
 export C_INCLUDE_PATH=/app/.heroku/vendor/include:/app/.heroku/python/include:$C_INCLUDE_PATH
 export CPLUS_INCLUDE_PATH=/app/.heroku/vendor/include:/app/.heroku/python/include:$CPLUS_INCLUDE_PATH
 export LIBRARY_PATH=/app/.heroku/vendor/lib:/app/.heroku/python/lib:$LIBRARY_PATH
 export LD_LIBRARY_PATH=/app/.heroku/vendor/lib:/app/.heroku/python/lib:$LD_LIBRARY_PATH
 export PKG_CONFIG_PATH=/app/.heroku/vendor/lib/pkg-config:/app/.heroku/python/lib/pkg-config:$PKG_CONFIG_PATH
 # Global pip options (https://pip.pypa.io/en/stable/user_guide/#environment-variables).
 # Disable pip's warnings about EOL Python since we show our own.
 export PIP_NO_PYTHON_VERSION_WARNING=1
 # The Application Code
 # --------------------
 # Switch to the repo's context.
-cd "$BUILD_DIR"
+cd $BUILD_DIR
-# The Cache
+# Warn for lack of Procfile.
-# ---------
+if [[ ! -f Procfile ]]; then
  puts-warn 'Warning: Your application is missing a Procfile. This file tells Heroku how to run your application.'
  puts-warn 'Learn more: https://devcenter.heroku.com/articles/procfile'
 fi
-# The workflow for the Python Buildpack's cache is as follows:
+# Prepare the cache.
-#
+mkdir -p $CACHE_DIR
 # - `~/.heroku/{known-paths}` are copied from the cache into the slug.
 # - The build is executed, modifying `~/.heroku/{known-paths}`.
 # - Once the build is complete, `~/.heroku/{known-paths}` is copied back into the cache.
 # Create the cache directory, if it doesn't exist.
 mkdir -p "$CACHE_DIR/.heroku"
 # Restore old artifacts from the cache.
 mkdir -p .heroku
-# The Python installation.
+cp -R $CACHE_DIR/.heroku/python .heroku/ &> /dev/null || true
-cp -R "$CACHE_DIR/.heroku/python" .heroku/ &> /dev/null || true
+cp -R $CACHE_DIR/.heroku/python-stack .heroku/ &> /dev/null || true
-# A plain text file which contains the current stack being used (used for cache busting).
+cp -R $CACHE_DIR/.heroku/python-version .heroku/ &> /dev/null || true
-cp -R "$CACHE_DIR/.heroku/python-stack" .heroku/ &> /dev/null || true
+cp -R $CACHE_DIR/.heroku/vendor .heroku/ &> /dev/null || true
-# A plain text file which contains the current python version being used (used for cache busting).
+if [[ -d $CACHE_DIR/.heroku/src ]]; then
-cp -R "$CACHE_DIR/.heroku/python-version" .heroku/ &> /dev/null || true
+  cp -R $CACHE_DIR/.heroku/src .heroku/ &> /dev/null || true
 # A plain text file which contains the current sqlite3 version being used (used for cache busting).
 cp -R "$CACHE_DIR/.heroku/python-sqlite3-version" .heroku/ &> /dev/null || true
 # "editable" installations of code repositories, via pip or pipenv.
 if [[ -d "$CACHE_DIR/.heroku/src" ]]; then
  cp -R "$CACHE_DIR/.heroku/src" .heroku/ &> /dev/null || true
 fi
-# The pre_compile hook. Customers rely on this. Don't remove it.
+# Experimental pre_compile hook.
-# This part of the code is used to allow users to customize their build experience
+source $BIN_DIR/steps/hooks/pre_compile
 # without forking the buildpack by providing a `bin/pre_compile` script, which gets
 # run inline with the buildpack automatically.
-# shellcheck source=bin/steps/hooks/pre_compile
+# Sticky runtimes.
-source "$BIN_DIR/steps/hooks/pre_compile"
+if [ -f $CACHE_DIR/.heroku/python-version ]; then
-
+  DEFAULT_PYTHON_VERSION=$(cat $CACHE_DIR/.heroku/python-version)
 # Sticky runtimes. If there was a previous build, and it used a given version of Python,
 # continue to use that version of Python in perpituity (warnings will be raised if
 # they are out–of–date).
 if [ -f "$CACHE_DIR/.heroku/python-version" ]; then
  CACHED_PYTHON_VERSION=$(cat "$CACHE_DIR/.heroku/python-version")
 fi
-# We didn't always record the stack version. This code is in place because of that.
+# Stack fallback for non-declared caches.
-if [ -f "$CACHE_DIR/.heroku/python-stack" ]; then
+if [ -f $CACHE_DIR/.heroku/python-stack ]; then
-  CACHED_PYTHON_STACK=$(cat "$CACHE_DIR/.heroku/python-stack")
+  CACHED_PYTHON_STACK=$(cat $CACHE_DIR/.heroku/python-stack)
 else
  CACHED_PYTHON_STACK=$STACK
 fi
 # Pipenv Python version support.
-# Detect the version of Python requested from a Pipfile (e.g. python_version or python_full_version).
+source $BIN_DIR/steps/pipenv-python-version
 # Convert it to a runtime.txt file.
-# shellcheck source=bin/steps/pipenv-python-version
+# If no runtime given, assume default version.
-source "$BIN_DIR/steps/pipenv-python-version"
+if [ ! -f runtime.txt ]; then
-
+  echo $DEFAULT_PYTHON_VERSION > runtime.txt
 if [[ -f runtime.txt ]]; then
  mcount "version.reason.python.specified"
 elif [[ -n "${CACHED_PYTHON_VERSION:-}" ]]; then
  mcount "version.reason.python.cached"
  echo "${CACHED_PYTHON_VERSION}" > runtime.txt
 else
  mcount "version.reason.python.default"
  echo "${DEFAULT_PYTHON_VERSION}" > runtime.txt
 fi
-# Create the directory for .profile.d, if it doesn't exist.
+mkdir -p $(dirname $PROFILE_PATH)
 mkdir -p "$(dirname "$PROFILE_PATH")"
 # Create the directory for editable source code installation, if it doesn't exist.
 mkdir -p /app/.heroku/src
 # On Heroku CI, builds happen in `/app`. Otherwise, on the Heroku platform,
 # they occur in a temp directory. Beacuse Python is not portable, we must create
 # symlinks to emulate that we are operating in `/app` during the build process.
 # This is (hopefully obviously) because apps end up running from `/app` in production.
 if [[ $BUILD_DIR != '/app' ]]; then
    # python expects to reside in /app, so set up symlinks
    # we will not remove these later so subsequent buildpacks can still invoke it
-    ln -nsf "$BUILD_DIR/.heroku/python" /app/.heroku/python
+    ln -nsf $BUILD_DIR/.heroku/python /app/.heroku/python
-    ln -nsf "$BUILD_DIR/.heroku/vendor" /app/.heroku/vendor
+    ln -nsf $BUILD_DIR/.heroku/vendor /app/.heroku/vendor
    # Note: .heroku/src is copied in later.
 fi
-# Download / Install Python, from pre-build binaries available on Amazon S3.
+# Install Python.
-# This step also bootstraps pip / setuptools.
+let start=$(nowms)
-(( start=$(nowms) ))
+source $BIN_DIR/steps/python
 # shellcheck source=bin/steps/python
 source "$BIN_DIR/steps/python"
 mtime "python.install.time" "${start}"
-# Install Pipenv dependencies, if a Pipfile was provided.
+# Sanity check for setuptools/distribute.
-# shellcheck source=bin/steps/pipenv
+let start=$(nowms)
-source "$BIN_DIR/steps/pipenv"
+source $BIN_DIR/steps/setuptools
 mtime "setuptools.install.time" "${start}"
 # Pipenv support.
 source $BIN_DIR/steps/pipenv
 # If no requirements.txt file given, assume `setup.py develop` is intended.
 # This allows for people to ship a setup.py application to Heroku
 if [ ! -f requirements.txt ] && [ ! -f Pipfile ]; then
  echo "-e ." > requirements.txt
 fi
 # Fix egg-links.
-# Because we're installing things into a different path than we're running them (temp dir vs app dir),
+source $BIN_DIR/steps/eggpath-fix
 # We must re-write all of Python's eggpath links to target the proper directory.
 # shellcheck source=bin/steps/eggpath-fix
 source "$BIN_DIR/steps/eggpath-fix"
-# SQLite3 support.
+# Mercurial support.
-# This sets up and installs sqlite3 dev headers and the sqlite3 binary but not the
+source $BIN_DIR/steps/mercurial
 # libsqlite3-0 library since that exists on the stack image.
 # Note: This only applies to Python 2.7.15+ and Python 3.6.6+
 (( start=$(nowms) ))
 # shellcheck source=bin/steps/sqlite3
 source "$BIN_DIR/steps/sqlite3"
 buildpack_sqlite3_install
 mtime "sqlite3.install.time" "${start}"
-# pip install
+# Pylibmc support.
-# -----------
+source $BIN_DIR/steps/pylibmc
-# Install dependencies with pip (where the magic happens).
+# Libffi support.
-(( start=$(nowms) ))
+source $BIN_DIR/steps/cryptography
-# shellcheck source=bin/steps/pip-install
+
-source "$BIN_DIR/steps/pip-install"
+# Support for Geo libraries.
 sub-env $BIN_DIR/steps/geo-libs
 # GDAL support.
 source $BIN_DIR/steps/gdal
 # Install dependencies with Pip (where the magic happens).
 let start=$(nowms)
 source $BIN_DIR/steps/pip-install
 mtime "pip.install.time" "${start}"
 # Uninstall removed dependencies with Pip.
 let start=$(nowms)
 source $BIN_DIR/steps/pip-uninstall
 mtime "pip.uninstall.time" "${start}"
 # Support for NLTK corpora.
-# Note: this may only work on Python 2.7. I don't think many customers use this functionality,
+let start=$(nowms)
-# and it should probably be undocumented.
+sub-env $BIN_DIR/steps/nltk
 # (there's an import error on 3.6 that should hopefully be fixed upstream at some point)
 (( start=$(nowms) ))
 sub_env "$BIN_DIR/steps/nltk"
 mtime "nltk.download.time" "${start}"
-# Support for editable installations. Here, we are copying pip–created src directory,
+# Support for pip install -e.
 # and copying it into the proper place (the logical place to do this was early, but it must be done here).
 # In CI, $BUILD_DIR is /app.
 if [[ ! "$BUILD_DIR" == "/app" ]]; then
-  rm -rf "$BUILD_DIR/.heroku/src"
+  rm -fr $BUILD_DIR/.heroku/src
-  deep-cp /app/.heroku/src "$BUILD_DIR/.heroku/src"
+  deep-cp /app/.heroku/src $BUILD_DIR/.heroku/src
 fi
 # Django collectstatic support.
-# The buildpack automatically runs collectstatic for Django applications.
+let start=$(nowms)
-# This is the cause for the majority of build failures on the Python platform.
+sub-env $BIN_DIR/steps/collectstatic
 # These failures are intentional — if collectstatic (which can be tricky, at times) fails,
 # your build fails.
 (( start=$(nowms) ))
 sub_env "$BIN_DIR/steps/collectstatic"
 mtime "collectstatic.time" "${start}"
-
+# Create .profile script for application runtime environment variables.
-# Progamatically create .profile.d script for application runtime environment variables.
+set-env PATH '$HOME/.heroku/python/bin:$PATH'
-
+set-env PYTHONUNBUFFERED true
-# Set the PATH to include Python / pip / pipenv / etc.
+set-env PYTHONHOME /app/.heroku/python
-set_env PATH "\$HOME/.heroku/python/bin:\$PATH"
+set-env LIBRARY_PATH '/app/.heroku/vendor/lib:/app/.heroku/python/lib:$LIBRARY_PATH'
-# Tell Python to run in unbuffered mode.
+set-env LD_LIBRARY_PATH '/app/.heroku/vendor/lib:/app/.heroku/python/lib:$LD_LIBRARY_PATH'
-set_env PYTHONUNBUFFERED true
+set-default-env LANG en_US.UTF-8
-# Tell Python where it lives.
+set-default-env PYTHONHASHSEED random
-set_env PYTHONHOME "\$HOME/.heroku/python"
+set-default-env PYTHONPATH /app/
 # Set variables for C libraries.
 set_env LIBRARY_PATH "\$HOME/.heroku/vendor/lib:\$HOME/.heroku/python/lib:\$LIBRARY_PATH"
 set_env LD_LIBRARY_PATH "\$HOME/.heroku/vendor/lib:\$HOME/.heroku/python/lib:\$LD_LIBRARY_PATH"
 # Locale.
 set_default_env LANG en_US.UTF-8
 # The Python hash seed is set to random.
 set_default_env PYTHONHASHSEED random
 # Tell Python to look for Python modules in the /app dir. Don't change this.
 set_default_env PYTHONPATH "\$HOME"
 # Python expects to be in /app, if at runtime, it is not, set
 # up symlinks… this can occur when the subdir buildpack is used.
 cat <<EOT >> "$PROFILE_PATH"
 if [[ \$HOME != "/app" ]]; then
    mkdir -p /app/.heroku
    ln -nsf "\$HOME/.heroku/python" /app/.heroku/python
    ln -nsf "\$HOME/.heroku/vendor" /app/.heroku/vendor
 fi
 EOT
 # Install sane-default script for $WEB_CONCURRENCY and $FORWARDED_ALLOW_IPS.
-cp "$ROOT_DIR/vendor/WEB_CONCURRENCY.sh" "$WEB_CONCURRENCY_PROFILE_PATH"
+cp $ROOT_DIR/vendor/WEB_CONCURRENCY.sh $WEB_CONCURRENCY_PROFILE_PATH
-cp "$ROOT_DIR/vendor/python.gunicorn.sh" "$GUNICORN_PROFILE_PATH"
+cp $ROOT_DIR/vendor/python.gunicorn.sh $GUNICORN_PROFILE_PATH
-# Experimental post_compile hook. Don't remove this.
+
-# shellcheck source=bin/steps/hooks/post_compile
+# Experimental post_compile hook.
-source "$BIN_DIR/steps/hooks/post_compile"
+source $BIN_DIR/steps/hooks/post_compile
 # Fix egg-links, again.
-# shellcheck source=bin/steps/eggpath-fix2
+source $BIN_DIR/steps/eggpath-fix2
 source "$BIN_DIR/steps/eggpath-fix2"
-# Store new artifacts in the cache.
+# Store new artifacts in cache.
 rm -rf "$CACHE_DIR/.heroku/python"
 rm -rf "$CACHE_DIR/.heroku/python-version"
 rm -rf "$CACHE_DIR/.heroku/python-stack"
 rm -rf "$CACHE_DIR/.heroku/vendor"
 rm -rf "$CACHE_DIR/.heroku/src"
-mkdir -p "$CACHE_DIR/.heroku"
+rm -rf $CACHE_DIR/.heroku/python
-cp -R .heroku/python "$CACHE_DIR/.heroku/"
+rm -rf $CACHE_DIR/.heroku/python-version
-cp -R .heroku/python-version "$CACHE_DIR/.heroku/"
+rm -rf $CACHE_DIR/.heroku/python-stack
-cp -R .heroku/python-stack "$CACHE_DIR/.heroku/" &> /dev/null || true
+rm -rf $CACHE_DIR/.heroku/vendor
 rm -rf $CACHE_DIR/.heroku/src
 mkdir -p $CACHE_DIR/.heroku
 cp -R .heroku/python $CACHE_DIR/.heroku/
 cp -R .heroku/python-version $CACHE_DIR/.heroku/
 cp -R .heroku/python-stack $CACHE_DIR/.heroku/ &> /dev/null || true
 cp -R .heroku/vendor $CACHE_DIR/.heroku/ &> /dev/null || true
 if [[ -d .heroku/src ]]; then
-  cp -R .heroku/src "$CACHE_DIR/.heroku/" &> /dev/null || true
+  cp -R .heroku/src $CACHE_DIR/.heroku/ &> /dev/null || true
 fi
 # Measure the size of the Python installation.
 # shellcheck disable=SC2119
 mmeasure 'python.size' "$(measure-size)"
@@ -1,17 +0,0 @@
 #!/usr/bin/env bash
 # Disable unused env var warning, since shellcheck doesn't take into account
 # that this file is sourced. We don't want to use export since it exposes
 # the env vars to subprocesses.
 # shellcheck disable=2034
 DEFAULT_PYTHON_VERSION="python-3.6.12"
 LATEST_39="python-3.9.0"
 LATEST_38="python-3.8.7"
 LATEST_37="python-3.7.9"
 LATEST_36="python-3.6.12"
 LATEST_35="python-3.5.10"
 LATEST_34="python-3.4.10"
 LATEST_27="python-2.7.18"
 LATEST_PYPY_36="pypy3.6-7.3.2"
 LATEST_PYPY_27="pypy2.7-7.3.2"
@@ -15,7 +15,7 @@
 BUILD_DIR=$1
 # Exit early if app is clearly not Python.
-if [ ! -f "$BUILD_DIR/requirements.txt" ] && [ ! -f "$BUILD_DIR/setup.py" ] && [ ! -f "$BUILD_DIR/Pipfile" ]; then
+if [ ! -f $BUILD_DIR/requirements.txt ] && [ ! -f $BUILD_DIR/setup.py ] && [ ! -f $BUILD_DIR/Pipfile ]; then
  exit 1
 fi
@@ -1,9 +1,10 @@
 #!/usr/bin/env bash
 # bin/release <build-dir>
 BIN_DIR=$(cd $(dirname $0); pwd) # absolute path
 BUILD_DIR=$1
-MANAGE_FILE=$(cd "$BUILD_DIR" && find . -maxdepth 3 -type f -name 'manage.py' | head -1)
+MANAGE_FILE=$(cd $BUILD_DIR && find . -maxdepth 3 -type f -name 'manage.py' | head -1)
 MANAGE_FILE=${MANAGE_FILE:2}
 cat <<EOF
@@ -1,21 +0,0 @@
 # Python Buildpack Install Steps
 TODO: Add context on Python install steps, such as why symlinking vs copying
 ## Installing Python packages using Pip
 ### Convention: Use `python` process to invoke Pip
 We don't use this convention (yet) but this is an upcoming change being considered.
 This is a bigger concern on Windows than it is in Linux environments, but an
 emerging convention in the Python community is to invoke pip using:
 ```
 python3 -m pip [options]
 ```
 Invoking pip this way ensures correct location - python knows where these
 packages are stored because it put them there (defaults to Python's pathing info).
 All normal command line options are available using this method.
@@ -10,8 +10,7 @@
 #   - $DISABLE_COLLECTSTATIC: disables this functionality.
 #   - $DEBUG_COLLECTSTATIC: upon failure, print out environment variables.
-# shellcheck source=bin/utils
+source $BIN_DIR/utils
 source "$BIN_DIR/utils"
 # Location of 'manage.py', if it exists.
 MANAGE_FILE=$(find . -maxdepth 3 -type f -name 'manage.py' -printf '%d\t%P\n' | sort -nk1 | cut -f2 | head -1)
@@ -20,8 +19,8 @@ MANAGE_FILE=${MANAGE_FILE:-fakepath}
 # Legacy file-based support for $DISABLE_COLLECTSTATIC
 [ -f .heroku/collectstatic_disabled ] && DISABLE_COLLECTSTATIC=1
-# Ensure that Django is actually installed.
+# Ensure that Django is explicitly specified in requirements.txt
-is_module_available 'django' && DJANGO_INSTALLED=1
+pip-grep -s Django && DJANGO_INSTALLED=1
 if [ ! "$DISABLE_COLLECTSTATIC" ] && [ -f "$MANAGE_FILE" ] && [ "$DJANGO_INSTALLED" ]; then
@@ -30,35 +29,13 @@ if [ ! "$DISABLE_COLLECTSTATIC" ] && [ -f "$MANAGE_FILE" ] && [ "$DJANGO_INSTALL
    puts-step "$ python $MANAGE_FILE collectstatic --noinput"
    # Run collectstatic, cleanup some of the noisy output.
-    PYTHONPATH=${PYTHONPATH:-.}
+    python $MANAGE_FILE collectstatic --noinput --traceback 2>&1 | sed '/^Post-processed/d;/^Copying/d;/^$/d' | indent
    export PYTHONPATH
    # Create a temporary file for collecting the collectstaic logs.
    COLLECTSTATIC_LOG=$(mktemp)
    python "$MANAGE_FILE" collectstatic --noinput --traceback 2>&1 | tee "$COLLECTSTATIC_LOG" | sed '/^Post-processed/d;/^Copying/d;/^$/d' | indent
    COLLECTSTATIC_STATUS="${PIPESTATUS[0]}"
    set -e
    # Display a warning if collectstatic failed.
-    [ "$COLLECTSTATIC_STATUS" -ne 0 ] && {
+    [ $COLLECTSTATIC_STATUS -ne 0 ] && {
        if grep -q 'SyntaxError' "$COLLECTSTATIC_LOG"; then
            mcount "failure.collectstatic.syntax-error"
        elif grep -q 'ImproperlyConfigured' "$COLLECTSTATIC_LOG"; then
            mcount "failure.collectstatic.improper-configuration"
        elif grep -q 'The CSS file' "$COLLECTSTATIC_LOG"; then
            mcount "failure.collectstatic.fancy-references"
        elif grep -q 'OSError' "$COLLECTSTATIC_LOG"; then
            mcount "failure.collectstatic.missing-file"
        else
            mcount "failure.collectstatic.other"
        fi
        echo
        echo " !     Error while running '$ python $MANAGE_FILE collectstatic --noinput'."
@@ -0,0 +1,31 @@
 #!/usr/bin/env bash
 # This script serves as the Cryptography build step of the
 # [**Python Buildpack**](https://github.com/heroku/heroku-buildpack-python)
 # compiler.
 #
 # A [buildpack](https://devcenter.heroku.com/articles/buildpacks) is an
 # adapter between a Python application and Heroku's runtime.
 #
 # This script is invoked by [`bin/compile`](/).
 # The location of the pre-compiled libffi binary.
 VENDORED_LIBFFI="https://lang-python.s3.amazonaws.com/$STACK/libraries/vendor/libffi.tar.gz"
 PKG_CONFIG_PATH="/app/.heroku/vendor/lib/pkgconfig:$PKG_CONFIG_PATH"
 # Syntax sugar.
 source $BIN_DIR/utils
 # If a package using cffi exists within requirements, use vendored libffi.
 if (pip-grep -s argon2-cffi bcrypt cffi cryptography PyNaCl pyOpenSSL PyOpenSSL misaka &> /dev/null) then
  if [ ! -d ".heroku/vendor/lib/libffi-3.1" ]; then
    echo "-----> Noticed cffi. Bootstrapping libffi."
    mkdir -p .heroku/vendor
    # Download and extract libffi into target vendor directory.
    curl $VENDORED_LIBFFI -s | tar zxv -C .heroku/vendor &> /dev/null
  fi
  export LIBFFI=$(pwd)/vendor
 fi
@@ -1,5 +1,3 @@
 #!/usr/bin/env bash
 set +e
 # delete any existing egg links, to uninstall exisisting installations.
 find .heroku/python/lib/python*/site-packages/ -name "*.egg-link" -delete 2> /dev/null
@@ -1,4 +1,3 @@
 #!/usr/bin/env bash
 set +e
 # rewrite build dir in egg links to /app so things are found at runtime
 find .heroku/python/lib/python*/site-packages/ -name "*.pth" -print0 2> /dev/null | xargs -r -0 -n 1 sed -i -e "s#$(pwd)#/app#" &> /dev/null
@@ -0,0 +1,32 @@
 #!/usr/bin/env bash
 # This script serves as the GDAL build step of the
 # [**Python Buildpack**](https://github.com/heroku/heroku-buildpack-python)
 # compiler.
 #
 # A [buildpack](https://devcenter.heroku.com/articles/buildpacks) is an
 # adapter between a Python application and Heroku's runtime.
 #
 # This script is invoked by [`bin/compile`](/).
 # The location of the pre-compiled cryptography binary.
 VENDORED_GDAL="https://lang-python.s3.amazonaws.com/$STACK/libraries/vendor/gdal.tar.gz"
 PKG_CONFIG_PATH="/app/.heroku/vendor/lib/pkgconfig:$PKG_CONFIG_PATH"
 # Syntax sugar.
 source $BIN_DIR/utils
 # If GDAL exists within requirements, use vendored gdal.
 if (pip-grep -s GDAL pygdal &> /dev/null) then
  if [ ! -f ".heroku/vendor/bin/gdalserver" ]; then
    echo "-----> Noticed GDAL. Bootstrapping gdal."
    mkdir -p .heroku/vendor
    # Download and extract cryptography into target vendor directory.
    curl $VENDORED_GDAL -s | tar zxv -C .heroku/vendor &> /dev/null
  fi
  export GDAL=$(pwd)/vendor
 fi
@@ -0,0 +1,36 @@
 #!/usr/bin/env bash
 # This script serves as the GDAL build step of the
 # [**Python Buildpack**](https://github.com/heroku/heroku-buildpack-python)
 # compiler.
 #
 # A [buildpack](https://devcenter.heroku.com/articles/buildpacks) is an
 # adapter between a Python application and Heroku's runtime.
 #
 # This script is invoked by [`bin/compile`](/).
 # The location of the pre-compiled cryptography binary.
 VENDORED_GDAL="https://lang-python.s3.amazonaws.com/$STACK/libraries/vendor/gdal.tar.gz"
 VENDORED_GEOS="https://lang-python.s3.amazonaws.com/$STACK/libraries/vendor/geos.tar.gz"
 VENDORED_PROJ="https://lang-python.s3.amazonaws.com/$STACK/libraries/vendor/proj.tar.gz"
 PKG_CONFIG_PATH="/app/.heroku/vendor/lib/pkgconfig:$PKG_CONFIG_PATH"
 # Syntax sugar.
 source $BIN_DIR/utils
 # If GDAL exists within requirements, use vendored gdal.
 if [[ "$BUILD_WITH_GEO_LIBRARIES" ]]; then
  if [ ! -f ".heroku/vendor/bin/proj" ]; then
    echo "-----> Bootstrapping gdal, geos, proj."
    mkdir -p .heroku/vendor
    # Download and extract cryptography into target vendor directory.
    curl $VENDORED_GDAL -s | tar zxv -C .heroku/vendor &> /dev/null
    curl $VENDORED_GEOS -s | tar zxv -C .heroku/vendor &> /dev/null
    curl $VENDORED_PROJ -s | tar zxv -C .heroku/vendor &> /dev/null
  fi
  export GDAL=$(pwd)/vendor
 fi
@@ -3,5 +3,5 @@
 if [ -f bin/post_compile ]; then
    echo "-----> Running post-compile hook"
    chmod +x bin/post_compile
-    sub_env bin/post_compile
+    sub-env bin/post_compile
 fi
@@ -3,5 +3,5 @@
 if [ -f bin/pre_compile ]; then
    echo "-----> Running pre-compile hook"
    chmod +x bin/pre_compile
-    sub_env bin/pre_compile
+    sub-env bin/pre_compile
 fi
@@ -0,0 +1,4 @@
 # Install Mercurial if it appears to be required.
 if (grep -Fiq "hg+" requirements.txt) then
    /app/.heroku/python/bin/pip install  mercurial | cleanup | indent
 fi
@@ -10,27 +10,21 @@
 # This script is invoked by [`bin/compile`](/).
 # Syntax sugar.
-# shellcheck source=bin/utils
+source $BIN_DIR/utils
 source "$BIN_DIR/utils"
 # Check that nltk was installed by pip, otherwise obviously not needed
-if is_module_available 'nltk'; then
+python -m nltk.downloader -h >/dev/null 2>&1
-    puts-step "Downloading NLTK corpora…"
+if [ $? -eq 0 ]; then
-
+    puts-step "Downloading NLTK corpora..."
    nltk_packages_definition="$BUILD_DIR/nltk.txt"
    if [ -f "$nltk_packages_definition" ]; then
-
+        nltk_packages=$(tr "\n" " " < "$nltk_packages_definition")
-        readarray -t nltk_packages < "$nltk_packages_definition"
+        puts-step "Downloading NLTK packages: $nltk_packages"
-        puts-step "Downloading NLTK packages: ${nltk_packages[*]}"
+        python -m nltk.downloader -d $BUILD_DIR/.heroku/python/nltk_data $nltk_packages  | indent
-
+        set-env NLTK_DATA "/app/.heroku/python/nltk_data"
        python -m nltk.downloader -d "$BUILD_DIR/.heroku/python/nltk_data" "${nltk_packages[@]}" | indent
        set_env NLTK_DATA "/app/.heroku/python/nltk_data"
        mcount "buildvar.NLTK_PACKAGES_DEFINITION"
        mcount "steps.nltk"
    else
        puts-warn "'nltk.txt' not found, not downloading any corpora"
        puts-warn "Learn more: https://devcenter.heroku.com/articles/python-nltk"
    fi
 fi
@@ -1,72 +1,23 @@
 #!/usr/bin/env bash
 # shellcheck source=bin/utils
 source "$BIN_DIR/utils"
 if [ ! "$SKIP_PIP_INSTALL" ]; then
    # Install dependencies with Pip.
    puts-step "Installing requirements with pip"
    # Set Pip env vars
    # This reads certain environment variables set on the Heroku app config
    # and makes them accessible to the pip install process.
    #
    # PIP_EXTRA_INDEX_URL allows for an alternate pypi URL to be used.
    if [[ -r "$ENV_DIR/PIP_EXTRA_INDEX_URL" ]]; then
        PIP_EXTRA_INDEX_URL="$(cat "$ENV_DIR/PIP_EXTRA_INDEX_URL")"
        export PIP_EXTRA_INDEX_URL
        mcount "buildvar.PIP_EXTRA_INDEX_URL"
    fi
    set +e
-
+    /app/.heroku/python/bin/pip install -r $BUILD_DIR/requirements.txt --exists-action=w --src=/app/.heroku/src --disable-pip-version-check --no-cache-dir 2>&1 | tee $WARNINGS_LOG | cleanup | indent
    # Set SLUGIFY_USES_TEXT_UNIDECODE, required for Airflow versions >=1.10
    if [[ -r "$ENV_DIR/SLUGIFY_USES_TEXT_UNIDECODE" ]]; then
        SLUGIFY_USES_TEXT_UNIDECODE="$(cat "$ENV_DIR/SLUGIFY_USES_TEXT_UNIDECODE")"
        export SLUGIFY_USES_TEXT_UNIDECODE
        mcount "buildvar.SLUGIFY_USES_TEXT_UNIDECODE"
    fi
    set +e
    # Measure that we're using pip.
    mcount "tool.pip"
    # Count expected build failures.
    if grep -q '==0.0.0' requirements.txt; then
        mcount "failure.none-version"
    fi
    if grep -qi '^django==1.*' requirements.txt; then
        puts-warn "Your Django version is nearing the end of its community support."
        puts-warn "Upgrade to continue to receive security updates and for the best experience with Django."
        puts-warn "For more information, check out https://www.djangoproject.com/download/#supported-versions"
    fi
    if [ ! -f "$BUILD_DIR/.heroku/python/bin/pip" ]; then
        exit 1
    fi
    /app/.heroku/python/bin/pip install -r "$BUILD_DIR/requirements.txt" --exists-action=w --src=/app/.heroku/src --disable-pip-version-check --no-cache-dir 2>&1 | tee "$WARNINGS_LOG" | cleanup | indent
    PIP_STATUS="${PIPESTATUS[0]}"
    set -e
    show-warnings
    if [[ ! $PIP_STATUS -eq 0 ]]; then
        mcount "failure.pip-install"
        exit 1
    fi
    # Smart Requirements handling
    cp requirements.txt .heroku/python/requirements-declared.txt
    /app/.heroku/python/bin/pip freeze --disable-pip-version-check > .heroku/python/requirements-installed.txt
-    # Install test dependencies, for CI.
+    echo
-    if [ "$INSTALL_TEST" ]; then
+fi
        if [[ -f "$1/requirements-test.txt" ]]; then
            puts-step "Installing test dependencies…"
            /app/.heroku/python/bin/pip install -r "$1/requirements-test.txt" --exists-action=w --src=./.heroku/src --disable-pip-version-check --no-cache-dir 2>&1 | cleanup | indent
        fi
    fi
 fi
@@ -0,0 +1,18 @@
 set +e
 # Install dependencies with Pip.
 if [[ -f .heroku/python/requirements-declared.txt ]]; then
  cp .heroku/python/requirements-declared.txt requirements-declared.txt
  pip-diff --stale requirements-declared.txt requirements.txt --exclude setuptools pip wheel > .heroku/python/requirements-stale.txt
  rm -fr requirements-declared.txt
  if [[ -s .heroku/python/requirements-stale.txt ]]; then
    puts-step "Uninstalling stale dependencies"
    /app/.heroku/python/bin/pip uninstall -r .heroku/python/requirements-stale.txt -y --exists-action=w | cleanup | indent
  fi
 fi
 set -e
@@ -1,82 +1,19 @@
-#!/usr/bin/env bash
+# Pipenv support (Generate requriements.txt with pipenv).
 if [[ -f Pipfile ]]; then
    if [[ ! -f requirements.txt ]]; then
        puts-step "Installing requirements with latest pipenv..."
-# export CLINT_FORCE_COLOR=1
+        # Install pipenv.
-# export PIPENV_FORCE_COLOR=1
+        /app/.heroku/python/bin/pip install pipenv --upgrade &> /dev/null
 # shellcheck source=bin/utils
 source "$BIN_DIR/utils"
 set -e
-if [[ -f Pipfile.lock ]]; then
+        # Install the dependencies.
-    if [[ -f .heroku/python/Pipfile.lock.sha256 ]]; then
+        /app/.heroku/python/bin/pipenv install --system 2>&1 | indent
        if [[ $(openssl dgst -sha256 Pipfile.lock) == $(cat .heroku/python/Pipfile.lock.sha256) ]]; then
            # Don't skip installation if there are git deps.
            if ! grep -q 'git' Pipfile.lock; then
                echo "Skipping installation, as Pipfile.lock hasn't changed since last deploy." | indent
                mcount "tool.pipenv"
                export SKIP_PIPENV_INSTALL=1
                export SKIP_PIP_INSTALL=1
            fi
        fi
    fi
 fi
 if [ ! "$SKIP_PIPENV_INSTALL" ]; then
    # Pipenv support (Generate requirements.txt with pipenv).
    if [[ -f Pipfile ]]; then
        # Measure that we're using Pipenv.
        mcount "tool.pipenv"
        # Skip pip install, later.
        export SKIP_PIP_INSTALL=1
-        # Set Pip env vars
+        # Pip freeze, for compatibility.
-        # This reads certain environment variables set on the Heroku app config
+        /app/.heroku/python/bin/pip freeze > requirements.txt
        # and makes them accessible to the pip install process.
        #
        # PIP_EXTRA_INDEX_URL allows for an alternate pypi URL to be used.
        if [[ -r "$ENV_DIR/PIP_EXTRA_INDEX_URL" ]]; then
            PIP_EXTRA_INDEX_URL="$(cat "$ENV_DIR/PIP_EXTRA_INDEX_URL")"
            export PIP_EXTRA_INDEX_URL
            mcount "buildvar.PIP_EXTRA_INDEX_URL"
        fi
        # Set SLUGIFY_USES_TEXT_UNIDECODE, required for Airflow versions >=1.10
        if [[ -r "$ENV_DIR/SLUGIFY_USES_TEXT_UNIDECODE" ]]; then
            SLUGIFY_USES_TEXT_UNIDECODE="$(cat "$ENV_DIR/SLUGIFY_USES_TEXT_UNIDECODE")"
            export SLUGIFY_USES_TEXT_UNIDECODE
            mcount "buildvar.SLUGIFY_USES_TEXT_UNIDECODE"
        fi
        export PIPENV_VERSION="2018.5.18"
        # Install pipenv.
        # Due to weird old pip behavior and pipenv behavior, pipenv upgrades pip
        # to latest if only --upgrade is specified. Specify upgrade strategy to
        # avoid this eager behavior.
        /app/.heroku/python/bin/pip install pipenv==$PIPENV_VERSION --upgrade --upgrade-strategy only-if-needed &> /dev/null
        # Install the test dependencies, for CI.
        if [ "$INSTALL_TEST" ]; then
            puts-step "Installing test dependencies…"
            /app/.heroku/python/bin/pipenv install --dev --system --deploy 2>&1 | cleanup | indent
        # Install the dependencies.
        elif [[ ! -f Pipfile.lock ]]; then
            puts-step "Installing dependencies with Pipenv $PIPENV_VERSION…"
            /app/.heroku/python/bin/pipenv install --system --skip-lock 2>&1 | indent
        else
            pipenv-to-pip Pipfile.lock > requirements.txt
            cp requirements.txt .heroku/python/requirements-declared.txt
            openssl dgst -sha256 Pipfile.lock > .heroku/python/Pipfile.lock.sha256
            puts-step "Installing dependencies with Pipenv $PIPENV_VERSION…"
            /app/.heroku/python/bin/pipenv install --system --deploy 2>&1 | indent
        fi
    fi
-else
+fi
    export SKIP_PIP_INSTALL=1
    pipenv-to-pip Pipfile.lock > requirements.txt
 fi
@@ -1,41 +1,23 @@
 #!/usr/bin/env bash
 # Detect Python-version with Pipenv.
-if [[ -f $BUILD_DIR/Pipfile ]]; then
+if [[ -f $BUILD_DIR/Pipfile.lock ]]; then
    if [[ ! -f $BUILD_DIR/runtime.txt ]]; then
        if [[ ! -f $BUILD_DIR/Pipfile.lock ]]; then
-            puts-warn "No 'Pipfile.lock' found! We recommend you commit this into your repository."
+            puts-warn "No 'pipfile.lock' found! We recommend you commit this into your repository."
        fi
        if [[ -f $BUILD_DIR/Pipfile.lock ]]; then
            set +e
-            PYTHON=$(jq -r '._meta.requires.python_full_version' "$BUILD_DIR/Pipfile.lock")
+            PYTHON=$(cat $BUILD_DIR/Pipfile.lock | jq '._meta.requires.python_version' -r)
            if [[ "$PYTHON" != "null" ]]; then
                echo "python-$PYTHON" > "$BUILD_DIR/runtime.txt"
            fi
            set -e
-            if [[ "$PYTHON" == "null" ]]; then
+            if [ "$PYTHON" = 2.7 ]; then
-                PYTHON=$(jq -r '._meta.requires.python_version' "$BUILD_DIR/Pipfile.lock")
+                echo "python-2.7.13" > $BUILD_DIR/runtime.txt
-                if [ "$PYTHON" = 2.7 ]; then
+            fi
-                    echo "$LATEST_27" > "$BUILD_DIR/runtime.txt"
+            if [ "$PYTHON" = 3.6 ]; then
-                fi
+                echo "python-3.6.0" > $BUILD_DIR/runtime.txt
                if [ "$PYTHON" = 3.6 ]; then
                    echo "$LATEST_36" > "$BUILD_DIR/runtime.txt"
                fi
                if [ "$PYTHON" = 3.7 ]; then
                    echo "$LATEST_37" > "$BUILD_DIR/runtime.txt"
                fi
                if [ "$PYTHON" = 3.8 ]; then
                    echo "$LATEST_38" > "$BUILD_DIR/runtime.txt"
                fi
                if [ "$PYTHON" = 3.9 ]; then
                    echo "$LATEST_39" > "$BUILD_DIR/runtime.txt"
                fi
            fi
        fi
    fi
 fi
@@ -0,0 +1,30 @@
 #!/usr/bin/env bash
 # This script serves as the Pylibmc build step of the
 # [**Python Buildpack**](https://github.com/heroku/heroku-buildpack-python)
 # compiler.
 #
 # A [buildpack](https://devcenter.heroku.com/articles/buildpacks) is an
 # adapter between a Python application and Heroku's runtime.
 #
 # This script is invoked by [`bin/compile`](/).
 # The location of the pre-compiled libmemcached binary.
 VENDORED_MEMCACHED="https://lang-python.s3.amazonaws.com/$STACK/libraries/vendor/libmemcache.tar.gz"
 # Syntax sugar.
 source $BIN_DIR/utils
 # If pylibmc exists within requirements, use vendored libmemcached.
 if (pip-grep -s pylibmc &> /dev/null) then
  if [ ! -d ".heroku/vendor/lib/sasl2" ]; then
    echo "-----> Noticed pylibmc. Bootstrapping libmemcached."
    mkdir -p .heroku/vendor
    # Download and extract libmemcached into target vendor directory.
    curl $VENDORED_MEMCACHED -s | tar zxv -C .heroku/vendor &> /dev/null
  fi
  export LIBMEMCACHED=$(pwd)/vendor
 fi
@@ -1,193 +1,62 @@
 #!/usr/bin/env bash
 set +e
 runtime-fixer runtime.txt
 PYTHON_VERSION=$(cat runtime.txt)
-# The location of the pre-compiled python binary.
+# Install Python.
 VENDORED_PYTHON="${S3_BASE_URL}/${STACK}/runtimes/${PYTHON_VERSION}.tar.gz"
 SECURITY_UPDATE="Python has released a security update! Please consider upgrading to"
 SECURITY_UPDATE_PYPY="The PyPy project has released a security update! Please consider upgrading to"
 ONLY_SUPPORTED_2_VERSION="Only the latest version of Python 2 is supported on the platform. Please consider upgrading to"
 PYTHON_2_EOL_UPDATE="Python 2 has reached it's community EOL. Upgrade your Python runtime to maintain a secure application as soon as possible."
 # check if runtime exists
 if curl --output /dev/null --silent --head --fail "$VENDORED_PYTHON"; then
  if [[ "$PYTHON_VERSION" == $PY39* ]]; then
    if [ "$PYTHON_VERSION" != "$LATEST_39" ]; then
      puts-warn "$SECURITY_UPDATE" "$LATEST_39"
      echo "       Learn More: https://devcenter.heroku.com/articles/python-runtimes"
    fi
  fi
  if [[ "$PYTHON_VERSION" == $PY38* ]]; then
    # do things to alert the user of security release available
    if [ "$PYTHON_VERSION" != "$LATEST_38" ]; then
      puts-warn "$SECURITY_UPDATE" "$LATEST_38"
      echo "       Learn More: https://devcenter.heroku.com/articles/python-runtimes"
    fi
  fi
  if [[ "$PYTHON_VERSION" == $PY37* ]]; then
    # do things to alert the user of security release available
    if [ "$PYTHON_VERSION" != "$LATEST_37" ]; then
      puts-warn "$SECURITY_UPDATE" "$LATEST_37"
      echo "       Learn More: https://devcenter.heroku.com/articles/python-runtimes"
    fi
  fi
  if [[ "$PYTHON_VERSION" == $PY36* ]]; then
    # security update note
    if [ "$PYTHON_VERSION" != "$LATEST_36" ]; then
      puts-warn "$SECURITY_UPDATE" "$LATEST_36"
      echo "       Learn More: https://devcenter.heroku.com/articles/python-runtimes"
    fi
  fi
  if [[ "$PYTHON_VERSION" == $PY35* ]]; then
    # security update note
    if [ "$PYTHON_VERSION" != "$LATEST_35" ]; then
      puts-warn "$SECURITY_UPDATE" "$LATEST_35"
      echo "       Learn More: https://devcenter.heroku.com/articles/python-runtimes"
    fi
  fi
  if [[ "$PYTHON_VERSION" == $PY34* ]]; then
    # security update note
    if [ "$PYTHON_VERSION" != "$LATEST_34" ]; then
      puts-warn "$SECURITY_UPDATE" "$LATEST_34"
      echo "       Learn More: https://devcenter.heroku.com/articles/python-runtimes"
    fi
  fi
  if [[ "$PYTHON_VERSION" == $PY27* ]]; then
    puts-warn "$PYTHON_2_EOL_UPDATE"
    echo "       Learn More: https://devcenter.heroku.com/articles/python-2-7-eol-faq"
    # security update note
    if [ "$PYTHON_VERSION" != "$LATEST_27" ]; then
      puts-warn "$ONLY_SUPPORTED_2_VERSION" "$LATEST_27"
      echo "       Learn More: https://devcenter.heroku.com/articles/python-runtimes"
    fi
  fi
  if [[ "$PYTHON_VERSION" == $PYPY27* ]]; then
    # security update note
    if [ "$PYTHON_VERSION" != "$LATEST_PYPY_27" ]; then
      puts-warn "$SECURITY_UPDATE_PYPY" "$LATEST_PYPY_27"
      echo "       Learn More: https://devcenter.heroku.com/articles/python-runtimes"
    fi
  fi
  if [[ "$PYTHON_VERSION" == $PYPY36* ]]; then
    # security update note
    if [ "$PYTHON_VERSION" != "$LATEST_PYPY_36" ]; then
      puts-warn "$SECURITY_UPDATE_PYPY" "$LATEST_PYPY_36"
      echo "       Learn More: https://devcenter.heroku.com/articles/python-runtimes"
    fi
  fi
 else
  puts-warn "Requested runtime ($PYTHON_VERSION) is not available for this stack ($STACK)."
  puts-warn "Aborting.  More info: https://devcenter.heroku.com/articles/python-support"
  exit 1
 fi
 mcount "version.python.${PYTHON_VERSION}"
 if [[ "$STACK" != "$CACHED_PYTHON_STACK" ]]; then
    puts-step "Stack has changed from $CACHED_PYTHON_STACK to $STACK, clearing cache"
    rm -rf .heroku/python-stack .heroku/python-version .heroku/python .heroku/vendor .heroku/python .heroku/python-sqlite3-version
 fi
 if [ -f .heroku/python-version ]; then
-  if [ ! "$(cat .heroku/python-version)" = "$PYTHON_VERSION" ]; then
+  if [ ! $(cat .heroku/python-version) = $PYTHON_VERSION ]; then
      puts-step "Found $(cat .heroku/python-version), removing"
-      rm -rf .heroku/python
+      rm -fr .heroku/python
  else
    SKIP_INSTALL=1
  fi
 fi
-# Check if we should reinstall python dependencies
+if [ ! $STACK = $CACHED_PYTHON_STACK ]; then
-if [[ ! -f "$CACHE_DIR/.heroku/requirements.txt" ]]; then
+    rm -fr .heroku/python .heroku/python-stack .heroku/vendor
  # IF there's no cached dependencies, update cached version of requirements.txt
  # This should only run for new apps and first deploys after this update
  cp -R "$BUILD_DIR/requirements.txt" "$CACHE_DIR/.heroku/requirements.txt"
 else
  # IF there IS a cached directory, check for differences with the new one
  if ! diff "$BUILD_DIR/requirements.txt" "$CACHE_DIR/.heroku/requirements.txt" &> /dev/null; then
    puts-step "Requirements file has been changed, clearing cached dependencies"
    # if there are any differences, clear the Python cache
    # Installing Python over again does not take noticably more time
    cp -R "$BUILD_DIR/requirements.txt" "$CACHE_DIR/.heroku/requirements.txt"
    rm -rf .heroku/python
    unset SKIP_INSTALL
  else
    puts-step "No change in requirements detected, installing from cache"
  fi
 fi
 if [ ! "$SKIP_INSTALL" ]; then
    puts-step "Installing $PYTHON_VERSION"
    # Prepare destination directory.
    mkdir -p .heroku/python
-    if ! curl "${VENDORED_PYTHON}" -s | tar zxv -C .heroku/python &> /dev/null; then
+    curl https://lang-python.s3.amazonaws.com/$STACK/runtimes/$PYTHON_VERSION.tar.gz -s | tar zxv -C .heroku/python &> /dev/null
    mcount "version.python.$PYTHON_VERSION"
    if [[ $? != 0 ]] ; then
      puts-warn "Requested runtime ($PYTHON_VERSION) is not available for this stack ($STACK)."
      puts-warn "Aborting.  More info: https://devcenter.heroku.com/articles/python-support"
      exit 1
    fi
  # Record for future reference.
-  echo "$PYTHON_VERSION" > .heroku/python-version
+  echo $PYTHON_VERSION > .heroku/python-version
-  echo "$STACK" > .heroku/python-stack
+  echo $STACK > .heroku/python-stack
  FRESH_PYTHON=true
  hash -r
 fi
 # If Pip isn't up to date:
 if [ "$FRESH_PYTHON" ] || [[ ! $(pip --version) == *$PIP_VERSION* ]]; then
  WORKING_DIR=$(pwd)
  TMPTARDIR=$(mktemp -d)
  trap "rm -rf $TMPTARDIR" RETURN
  puts-step "Installing pip"
  # Remove old installations.
  rm -fr /app/.heroku/python/lib/python2.7/site-packages/pip-*
  rm -fr /app/.heroku/python/lib/python2.7/site-packages/setuptools-*
  /app/.heroku/python/bin/python $ROOT_DIR/vendor/get-pip.py &> /dev/null
 fi
 set -e
 PIP_VERSION='20.1.1'
 # Must use setuptools <47.2.0 until we fix:
 # https://github.com/heroku/heroku-buildpack-python/issues/1006
 SETUPTOOLS_VERSION='47.1.1'
 WHEEL_VERSION='0.34.2'
 if [[ "${PYTHON_VERSION}" == ${PY34}* ]]; then
  # Python 3.4 support was dropped in pip 19.2+, setuptools 44+ and wheel 0.34+.
  PIP_VERSION='19.1.1'
  SETUPTOOLS_VERSION='43.0.0'
  WHEEL_VERSION='0.33.6'
 elif [[ "${PYTHON_VERSION}" == ${PY27}* || "${PYTHON_VERSION}" == ${PYPY27}* ]]; then
  # Python 2.7 support was dropped in setuptools 45+.
  SETUPTOOLS_VERSION='44.1.1'
 fi
 # We don't use get-pip.py, since:
 #  - it uses `--force-reinstall`, which is unnecessary here and slows down repeat builds
 #  - it means downloading pip twice (once embedded in get-pip.py, and again during
 #    the install, since get-pip.py can't install the embedded version directly)
 #  - we would still have to manage several versions of get-pip.py, to support older Pythons.
 # Instead, we use the pip wheel to install itself, using the method described here:
 # https://github.com/pypa/pip/issues/2351#issuecomment-69994524
 PIP_WHEEL_FILENAME="pip-${PIP_VERSION}-py2.py3-none-any.whl"
 PIP_WHEEL_URL="${S3_BASE_URL}/common/${PIP_WHEEL_FILENAME}"
 PIP_WHEEL="${TMPDIR:-/tmp}/${PIP_WHEEL_FILENAME}"
 if ! curl -sSf "${PIP_WHEEL_URL}" -o "$PIP_WHEEL"; then
  mcount "failure.python.download-pip"
  puts-warn "Failed to download pip"
  exit 1
 fi
 if [[ -f "$BUILD_DIR/Pipfile" ]]; then
  # The buildpack is pinned to old pipenv, which requires older pip.
  # Pip 9.0.2 doesn't support installing itself from a wheel, so we have to use split
  # versions here (ie: installer pip version different from target pip version).
  PIP_VERSION='9.0.2'
  PIP_TO_INSTALL="pip==${PIP_VERSION}"
 else
  PIP_TO_INSTALL="${PIP_WHEEL}"
 fi
 puts-step "Installing pip ${PIP_VERSION}, setuptools ${SETUPTOOLS_VERSION} and wheel ${WHEEL_VERSION}"
 /app/.heroku/python/bin/python "${PIP_WHEEL}/pip" install --quiet --disable-pip-version-check --no-cache \
  "${PIP_TO_INSTALL}" "setuptools==${SETUPTOOLS_VERSION}" "wheel==${WHEEL_VERSION}"
 hash -r
@@ -0,0 +1,11 @@
 #!/usr/bin/env bash
 # Syntax sugar.
 source $BIN_DIR/utils
 if (pip-grep -s setuptools distribute &> /dev/null) then
  puts-warn 'The package setuptools/distribute is listed in requirements.txt.'
  puts-warn 'Please remove to ensure expected behavior. '
 fi
@@ -1,77 +0,0 @@
 #!/usr/bin/env bash
 # shellcheck source=bin/utils
 source "$BIN_DIR/utils"
 sqlite3_install() {
  HEROKU_PYTHON_DIR="$1"
  HEADERS_ONLY="$3"
  mkdir -p "$HEROKU_PYTHON_DIR"
  APT_CACHE_DIR="$HEROKU_PYTHON_DIR/apt/cache"
  APT_STATE_DIR="$HEROKU_PYTHON_DIR/apt/state"
  mkdir -p "$APT_CACHE_DIR/archives/partial"
  mkdir -p "$APT_STATE_DIR/lists/partial"
  APT_OPTIONS="-o debug::nolocking=true"
  APT_OPTIONS="$APT_OPTIONS -o dir::cache=$APT_CACHE_DIR"
  APT_OPTIONS="$APT_OPTIONS -o dir::state=$APT_STATE_DIR"
  APT_OPTIONS="$APT_OPTIONS -o dir::etc::sourcelist=/etc/apt/sources.list"
  apt-get $APT_OPTIONS update > /dev/null 2>&1
  if [ -z "$HEADERS_ONLY" ]; then
    apt-get $APT_OPTIONS -y -d --reinstall install libsqlite3-dev sqlite3 > /dev/null 2>&1
  else
    apt-get $APT_OPTIONS -y -d --reinstall install libsqlite3-dev
  fi
  find "$APT_CACHE_DIR/archives/" -name "*.deb" -exec dpkg -x {} "$HEROKU_PYTHON_DIR/sqlite3/" \;
  mkdir -p "$HEROKU_PYTHON_DIR/include"
  mkdir -p "$HEROKU_PYTHON_DIR/lib"
  # remove old sqlite3 libraries/binaries
  find "$HEROKU_PYTHON_DIR/include/" -name "sqlite3*.h" -exec rm -f {} \;
  find "$HEROKU_PYTHON_DIR/lib/" -name "libsqlite3.*" -exec rm -f {} \;
  rm -f "$HEROKU_PYTHON_DIR/lib/pkgconfig/sqlite3.pc"
  rm -f "$HEROKU_PYTHON_DIR/bin/sqlite3"
  # copy over sqlite3 headers & bins and setup linking against the stack image library
  mv "$HEROKU_PYTHON_DIR/sqlite3/usr/include/"* "$HEROKU_PYTHON_DIR/include/"
  mv "$HEROKU_PYTHON_DIR/sqlite3/usr/lib/x86_64-linux-gnu"/libsqlite3.*a "$HEROKU_PYTHON_DIR/lib/"
  mkdir -p "$HEROKU_PYTHON_DIR/lib/pkgconfig"
  # set the right prefix/lib directories
  sed -e 's/prefix=\/usr/prefix=\/app\/.heroku\/python/' -e 's/\/x86_64-linux-gnu//' "$HEROKU_PYTHON_DIR/sqlite3/usr/lib/x86_64-linux-gnu/pkgconfig/sqlite3.pc" > "$HEROKU_PYTHON_DIR/lib/pkgconfig/sqlite3.pc"
  # need to point the libsqlite3.so to the stack image library for /usr/bin/ld -lsqlite3
  SQLITE3_LIBFILE="/usr/lib/x86_64-linux-gnu/$(readlink -n "$HEROKU_PYTHON_DIR/sqlite3/usr/lib/x86_64-linux-gnu/libsqlite3.so")"
  ln -s "$SQLITE3_LIBFILE" "$HEROKU_PYTHON_DIR/lib/libsqlite3.so"
  if [ -z "$HEADERS_ONLY" ]; then
    mv "$HEROKU_PYTHON_DIR/sqlite3/usr/bin"/* "$HEROKU_PYTHON_DIR/bin/"
  fi
  # cleanup
  rm -rf "$HEROKU_PYTHON_DIR/sqlite3/"
  rm -rf "$HEROKU_PYTHON_DIR/apt/"
 }
 buildpack_sqlite3_install() {
  HEROKU_PYTHON_DIR="$BUILD_DIR/.heroku/python"
  SQLITE3_VERSION_FILE="$BUILD_DIR/.heroku/python-sqlite3-version"
  if [ -f "$SQLITE3_VERSION_FILE" ]; then
    INSTALLED_SQLITE3_VERSION=$(cat "$SQLITE3_VERSION_FILE")
  fi
  puts-step "Installing SQLite3"
  if sqlite3_install "$BUILD_DIR/.heroku/python" ; then
    mcount "success.python.sqlite3"
  else
    echo "Sqlite3 failed to install."
    mcount "failure.python.sqlite3"
  fi
  mkdir -p "$CACHE_DIR/.heroku/"
 }
@@ -1,13 +1,11 @@
 #!/usr/bin/env bash
 # Syntax sugar.
-BIN_DIR=$(cd "$(dirname "$0")" || return; pwd) # absolute path
+BIN_DIR=$(cd $(dirname $0); pwd) # absolute path
 source $BIN_DIR/utils
-# shellcheck source=bin/utils
+DISABLE_COLLECTSTATIC=1 "$(dirname ${0:-})/compile" "$1" "$2" "$3"
 source "$BIN_DIR/utils"
-# Locale support for Pipenv.
+if [[ -f "$1/requirements-test.txt" ]]; then
-export LC_ALL=C.UTF-8
+    /app/.heroku/python/bin/pip install -r "$1/requirements-test.txt" --exists-action=w --src=./.heroku/src --disable-pip-version-check --no-cache-dir 2>&1 | cleanup | indent
-export LANG=C.UTF-8
+fi
 DISABLE_COLLECTSTATIC=1 INSTALL_TEST=1 "$(dirname "${0:-}")/compile" "$1" "$2" "$3"
@@ -1,16 +1,13 @@
 #!/usr/bin/env bash
 shopt -s extglob
 shopt -s nullglob
-# This is necessary since this script is sometimes sourced from
+# The standard library.
-# subshells that don't have the variables from bin/compile.
+if [[ ! -f  /tmp/stdlib.sh ]]; then
-# Remove this once we no longer wrap all the things in `sub_env`.
+  curl --retry 3 -s https://lang-common.s3.amazonaws.com/buildpack-stdlib/v2/stdlib.sh > /tmp/stdlib.sh
-BIN_DIR=$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)
+fi
-ROOT_DIR=$(dirname "${BIN_DIR}")
+source /tmp/stdlib.sh
 # shellcheck source=vendor/buildpack-stdlib_v8.sh
 source "${ROOT_DIR}/vendor/buildpack-stdlib_v8.sh"
-if [ "$(uname)" == Darwin ]; then
+if [ $(uname) == Darwin ]; then
    sed() { command sed -l "$@"; }
 else
    sed() { command sed -u "$@"; }
@@ -29,12 +26,12 @@ cleanup() {
 # Buildpack Steps.
 puts-step() {
-  echo "-----> $*"
+  echo "-----> $@"
 }
 # Buildpack Warnings.
 puts-warn() {
-  echo " !     $*"
+  echo " !     $@"
 }
 # Does some serious copying.
@@ -54,53 +51,31 @@ deep-cp() {
 }
 sub-env() {
  WHITELIST=${2:-''}
  BLACKLIST=${3:-'^(GIT_DIR|STACK|PYTHONHOME|LD_LIBRARY_PATH|LIBRARY_PATH|PATH)$'}
  # Python-specific variables.
  export PYHONHOME=$BUILD_DIR/.heroku/python
  export PYTHONPATH=$BUILD_DIR/
  (
    if [ -d "$ENV_DIR" ]; then
      for e in $(ls $ENV_DIR); do
        echo "$e" | grep -E "$WHITELIST" | grep -qvE "$BLACKLIST" &&
        export "$e=$(cat $ENV_DIR/$e)"
        :
      done
    fi
    $1
  )
 }
 # Measure the size of the Python installation.
 measure-size() {
-  echo "$(du -s .heroku/python 2>/dev/null || echo 0) | awk '{print $1}')"
+  echo "$((du -s .heroku/python 2>/dev/null || echo 0) | awk '{print $1}')"
 }
 # Python version operator >
 version_gt() {
  test "$(printf '%s\n' "$@" | sort -V | head -n 1)" != "$1";
 }
 # Python verison operator >=
 version_gte() {
  if [ "$1" == "$2" ]; then
    return 0
  fi
  version_gt "$1" "$2"
 }
 # Check if Python 2
 python2_check() {
  VERSION="$1"
  version_gte "$VERSION" "python-2.7.0" && version_gt "python-3.0.0" "$VERSION"
 }
 # Check if Python 3
 python3_check() {
  VERSION="$1"
  version_gte "$VERSION" "python-3.0.0" && version_gt "python-4.0.0" "$VERSION"
 }
 # Check if Python version needs to install SQLite3
 python_sqlite3_check() {
  VERSION="$1"
  MIN_PYTHON_3="python-3.5.6"
  MIN_PYTHON_2="python-2.7.15"
  ( python2_check "$VERSION" && version_gte "$VERSION" "$MIN_PYTHON_2" ) \
    || ( python3_check "$VERSION" && version_gte "$VERSION" "$MIN_PYTHON_3" )
 }
 is_module_available() {
  # Returns 0 is the specified module exists, otherwise returns 1.
  # Uses pkgutil rather than pkg_resources or pip's CLI, since pkgutil exists
  # in the stdlib, and doesn't depend on the choice of package manager.
  local module_name="${1}"
  python -c "import sys, pkgutil; sys.exit(0 if pkgutil.find_loader('${module_name}') else 1)"
 }
@@ -1,4 +1,3 @@
 #!/usr/bin/env bash
 shopt -s extglob
 old-platform() {
@@ -12,6 +11,16 @@ old-platform() {
  fi
 }
 pylibmc-missing() {
  if grep -qi 'fatal error: libmemcached/memcached.h: No such file or directory' "$WARNINGS_LOG"; then
    echo
    puts-warn "Hello! There was a problem with your build related to libmemcache."
    puts-warn "The Python library 'pylibmc' must be explicitly specified in 'requirements.txt' in order to build correctly."
    puts-warn "Once you do that, everything should work as expected.   -- Much Love, Heroku."
    mcount 'warnings.libmemcache'
  fi
 }
 scipy-included() {
  if grep -qi 'running setup.py install for scipy' "$WARNINGS_LOG"; then
    echo
@@ -46,22 +55,11 @@ six-included() {
  fi
 }
 gdal-missing() {
  if grep -qi 'Could not find gdal-config' "$WARNINGS_LOG"; then
    mcount 'warnings.gdal'
    echo
    puts-warn "Hello! Package installation failed since the GDAL library was not found."
    puts-warn "For GDAL, GEOS and PROJ support, use the Geo buildpack alongside the Python buildpack:"
    puts-warn "https://github.com/heroku/heroku-geo-buildpack"
    puts-warn "  -- Much Love, Heroku."
  fi
 }
 show-warnings() {
  old-platform
  pylibmc-missing
  scipy-included
  distribute-included
  six-included
  gdal-missing
 }
@@ -1,13 +0,0 @@
 [buildpack]
 name = "Python"
  [publish.Ignore]
  files = [
    "test/",
    ".gitignore",
    ".dockerignore",
    ".github/",
    "Dockerfile",
    "Pipfile",
    "Pipfile.lock"
  ]
@@ -1,80 +1,41 @@
 # Python Buildpack Binaries
-The binaries for this buildpack are built in Docker containers based on the Heroku stack image.
+For Cedar-14 stack
 ------------------
-## Configuration
+To get started with it, create an app on Heroku inside a clone of this repository, and set your S3 config vars:
-In order to publish binaries AWS credentials must be passed to the build container.
+    $ heroku create --buildpack https://github.com/heroku/heroku-buildpack-python#not-heroku
-If you are testing only the build (ie: `bob build`), these are optional.
+    $ heroku config:set WORKSPACE_DIR=builds
    $ heroku config:set AWS_ACCESS_KEY_ID=<your_aws_key>
    $ heroku config:set AWS_SECRET_ACCESS_KEY=<your_aws_secret>
    $ heroku config:set S3_BUCKET=<your_s3_bucket_name>
 In addition, unless you are building the official binaries for Heroku (which use the defaults
 specified in each `Dockerfile`), you will need to override `S3_BUCKET` and `S3_PREFIX` to
 match your own S3 bucket/use case.
-If you only need to set AWS credentials, you can do so by setting the environment variables
+Then, shell into an instance and run a build by giving the name of the formula inside `builds`:
 `AWS_ACCESS_KEY_ID` and `AWS_SECRET_ACCESS_KEY` before calling the make commands.
-For example:
+    $ heroku run bash
    Running `bash` attached to terminal... up, run.6880
    ~ $ bob build runtimes/python-2.7.6
-```bash
+    Fetching dependencies... found 2:
-set +o history # Disable bash history
+      - libraries/sqlite
 export AWS_ACCESS_KEY_ID=...
 export AWS_SECRET_ACCESS_KEY=...
 set -o history # Re-enable bash history
 make ...
 ```
-If you need to override the default S3 bucket, or would prefer not to use credentials via
+    Building formula runtimes/python-2.7.6:
-environment variables, then you need to instead use a Docker env file like so:
+        === Building Python 2.7.6
        Fetching Python v2.7.6 source...
        Compiling...
-1. Copy the `builds/dockerenv.default` env file to a location outside the buildpack repository.
+If this works, run `bob deploy` instead of `bob build` to have the result uploaded to S3 for you.
 2. Edit the new file, adding at a minimum the values for the variables
   `AWS_ACCESS_KEY_ID` and `AWS_SECRET_ACCESS_KEY` (see Docker
   [env-file documentation](https://docs.docker.com/engine/reference/commandline/run/#set-environment-variables--e---env---env-file)).
 3. Pass the path of the file to the make commands using `ENV_FILE`. For example:
-   ```bash
+To speed things up drastically, it'll usually be a good idea to `heroku run bash --size PX` instead.
   make ... ENV_FILE=~/.dockerenv.python-buildpack
   ```
-## Launching an interactive build environment
+For Heroku-16 stack
 -------------------
-To start an interactive version of the build environment (ideal for development) use the
+1. Ensure GNU Make and Docker are installed.
-`buildenv` make target, passing in the desired `STACK` name. For example:
+2. From the root of the buildpack repository, run: `make buildenv-heroku-16`
 3. Follow the instructions displayed!
 ```bash
 make buildenv STACK=heroku-18
 ```
-This will create the builder docker image based on the latest image for that stack, and
+Enjoy :)
 then start a bash shell where you can run `bob build`, `bob deploy`, and so forth.
 The `builds/` directory is bind-mounted into the running container, so local build formula
 changes will appear there immediately without the need to rebuild the image.
 ## Bulk deploying runtimes
 When a new Python version is released, binaries have to be generated for multiple stacks.
 To automate this, use the `deploy-runtimes` make target, which will ensure the builder
 image is up to date, and then run `bob deploy` for each runtime-stack combination.
 The build formula name(s) are passed using `RUNTIMES`, like so:
 ```bash
 make deploy-runtimes RUNTIMES='python-X.Y.Z'
 ```
 By default this will deploy to all supported stacks (see `STACKS` in `Makefile`),
 but this can be overridden using `STACKS`:
 ```bash
 make deploy-runtimes RUNTIMES='python-X.Y.Z' STACKS='heroku-16 heroku-18'
 ```
 Multiple runtimes can also be specified (useful for when adding a new stack), like so:
 ```bash
 make deploy-runtimes RUNTIMES='python-A.B.C python-X.Y.Z' STACKS='heroku-20'
 ```
 Note: Both `RUNTIMES` and `STACKS` are space delimited.
@@ -1,8 +0,0 @@
 # Since no values are specified here, these variables will be read from the environment at run time:
 # https://docs.docker.com/engine/reference/commandline/run/#set-environment-variables--e---env---env-file
 AWS_ACCESS_KEY_ID
 AWS_SECRET_ACCESS_KEY
 # Uncomment these if you need to override the default S3 bucket and/or path prefixes.
 # S3_BUCKET
 # S3_PREFIX
@@ -1,20 +0,0 @@
 FROM heroku/heroku:16-build
 ENV WORKSPACE_DIR="/app/builds" \
    S3_BUCKET="heroku-buildpack-python" \
    S3_PREFIX="heroku-16/" \
    STACK="heroku-16"
 RUN apt-get update \
    && DEBIAN_FRONTEND=noninteractive apt-get install --no-install-recommends -y \
        libsqlite3-dev \
        python3-pip \
        python3-setuptools \
    && rm -rf /var/lib/apt/lists/*
 WORKDIR /app
 COPY requirements.txt /app/
 RUN pip3 install --disable-pip-version-check --no-cache-dir -r /app/requirements.txt
 COPY . /app
@@ -1,20 +0,0 @@
 FROM heroku/heroku:18-build
 ENV WORKSPACE_DIR="/app/builds" \
    S3_BUCKET="heroku-buildpack-python" \
    S3_PREFIX="heroku-18/" \
    STACK="heroku-18"
 RUN apt-get update \
    && DEBIAN_FRONTEND=noninteractive apt-get install --no-install-recommends -y \
        libsqlite3-dev \
        python3-pip \
        python3-setuptools \
    && rm -rf /var/lib/apt/lists/*
 WORKDIR /app
 COPY requirements.txt /app/
 RUN pip3 install --disable-pip-version-check --no-cache-dir -r /app/requirements.txt
 COPY . /app
@@ -1,20 +0,0 @@
 FROM heroku/heroku:20-build
 ENV WORKSPACE_DIR="/app/builds" \
    S3_BUCKET="heroku-buildpack-python" \
    S3_PREFIX="heroku-20/" \
    STACK="heroku-20"
 RUN apt-get update \
    && DEBIAN_FRONTEND=noninteractive apt-get install --no-install-recommends -y \
        libsqlite3-dev \
        python3-pip \
        python3-setuptools \
    && rm -rf /var/lib/apt/lists/*
 WORKDIR /app
 COPY requirements.txt /app/
 RUN pip3 install --disable-pip-version-check --no-cache-dir -r /app/requirements.txt
 COPY . /app
@@ -3,7 +3,7 @@
 OUT_PREFIX=$1
-echo "Building SQLite…"
+echo "Building SQLite..."
 SOURCE_TARBALL='https://www.sqlite.org/sqlite-autoconf-3070900.tar.gz'
@@ -19,4 +19,4 @@ make install
 # Cleanup
 cd ..
-rm -rf sqlite
+rm -fr sqlite
@@ -0,0 +1,23 @@
 #!/usr/bin/env bash
 # Build Path: /app/.heroku/vendor/
 OUT_PREFIX=$1
 # Use new path, containing autoconf.
 export PATH="/app/.heroku/python/bin/:$PATH"
 hash -r
 echo "Building gdal..."
 SOURCE_TARBALL='http://download.osgeo.org/gdal/1.11.1/gdal-1.11.1.tar.gz'
 curl -L $SOURCE_TARBALL | tar zx
 cd gdal-1.11.1
 ./configure --prefix=$OUT_PREFIX --enable-static=no  &&
 make
 make install
 # Cleanup
 cd ..
@@ -0,0 +1,23 @@
 #!/usr/bin/env bash
 # Build Path: /app/.heroku/vendor/
 OUT_PREFIX=$1
 # Use new path, containing autoconf.
 export PATH="/app/.heroku/python/bin/:$PATH"
 hash -r
 echo "Building geos..."
 SOURCE_TARBALL='http://download.osgeo.org/geos/geos-3.4.3.tar.bz2'
 curl -L $SOURCE_TARBALL | tar xj
 cd geos-3.4.3
 ./configure --prefix=$OUT_PREFIX --enable-static=no &&
 make
 make install
 # Cleanup
 cd ..
@@ -0,0 +1,28 @@
 #!/usr/bin/env bash
 # Build Path: /app/.heroku/vendor/
 OUT_PREFIX=$1
 # Skip the build for heroku-16.
 if [[ $S3_PREFIX == "heroku-16" ]]; then
    exit 0
 fi
 # Use new path, containing autoconf.
 export PATH="/app/.heroku/python/bin/:$PATH"
 hash -r
 echo "Building libffi..."
 SOURCE_TARBALL='ftp://sourceware.org/pub/libffi/libffi-3.1.tar.gz'
 curl -L $SOURCE_TARBALL | tar x
 cd libffi-3.1
 ./configure --prefix=$OUT_PREFIX --disable-static &&
 make
 make install
 # Cleanup
 cd ..
@@ -0,0 +1,45 @@
 #!/usr/bin/env bash
 # Build Path: /app/.heroku/vendor/
 OUT_PREFIX=$1
 # Skip the build for heroku-16.
 if [[ $S3_PREFIX == "heroku-16" ]]; then
    exit 0
 fi
 # fail hard
 set -o pipefail
 # fail harder
 set -eux
 DEFAULT_VERSION="1.0.18"
 dep_version=${VERSION:-$DEFAULT_VERSION}
 dep_dirname=libmemcached-${dep_version}
 dep_archive_name=${dep_dirname}.tar.gz
 dep_url=https://launchpad.net/libmemcached/1.0/${dep_version}/+download/${dep_archive_name}
 # SASL Support.
 echo "-----> Building cyrus-sasl 2.1.26..."
 curl -LO ftp://ftp.cyrusimap.org/cyrus-sasl/cyrus-sasl-2.1.26.tar.gz
 # FTP doesn't play well with piping into tar xz
 tar xzf cyrus-sasl-2.1.26.tar.gz
 pushd cyrus-sasl-2.1.26
 ./configure --prefix=${OUT_PREFIX} --with-plugindir=${OUT_PREFIX}lib/sasl2 --with-configdir=${OUT_PREFIX}lib/sasl2
 make -s -j 9
 make install -s
 popd
 echo "-----> Building libmemcached ${dep_version}..."
 curl -L ${dep_url} | tar xz
 pushd ${dep_dirname}
 CPPFLAGS=-I${OUT_PREFIX}/include LDFLAGS=-L${OUT_PREFIX}/lib ./configure --prefix=${OUT_PREFIX} --without-memcached
 make -s -j 9
 make install -s
 popd
 echo "-----> Done."
@@ -0,0 +1,23 @@
 #!/usr/bin/env bash
 # Build Path: /app/.heroku/vendor/
 OUT_PREFIX=$1
 # Use new path, containing autoconf.
 export PATH="/app/.heroku/python/bin/:$PATH"
 hash -r
 echo "Building gdal..."
 SOURCE_TARBALL='http://download.osgeo.org/proj/proj-4.8.0.tar.gz'
 curl -L $SOURCE_TARBALL | tar zx
 cd proj-4.8.0
 ./configure --prefix=$OUT_PREFIX --enable-static=no &&
 make
 make install
 # Cleanup
 cd ..
@@ -1,22 +0,0 @@
 #!/usr/bin/env bash
 # fail hard
 set -o pipefail
 # fail harder
 set -eu
 OUT_PREFIX=$1
 dep_formula=${0#$WORKSPACE_DIR/} # this is the original script, e.g. pypy-5.3.1
 dep_name=$(basename $BASH_SOURCE) # this is us
 dep_version=${dep_formula##*"/${dep_name}-"} # "subtract" our name from full version name
 dep_package=${dep_name}2-v${dep_version} # it's always "pypy2-…"
 dep_dirname=${dep_package}-linux64
 dep_archive_name=${dep_dirname}.tar.bz2
 dep_url=https://bitbucket.org/pypy/pypy/downloads/${dep_archive_name}
 echo "Building PyPy…"
 curl -L "${dep_url}" | tar jx -C "${OUT_PREFIX}" --strip-components 1 # extract to $OUT_PREFIX, drop the first directory level, which is the archive name
 ln "$OUT_PREFIX/bin/pypy" "$OUT_PREFIX/bin/python"
@@ -2,4 +2,13 @@
 # Build Path: /app/.heroku/python/
 # Build Deps: libraries/sqlite
-source $(dirname $0)/pypy
+# NOTICE: This formula only works for the cedar-14 stack, not cedar.
 OUT_PREFIX=$1
 echo "Building PyPy..."
 SOURCE_TARBALL='https://bitbucket.org/pypy/pypy/downloads/pypy2-v5.3.1-linux64.tar.bz2'
 curl -L $SOURCE_TARBALL | tar jx
 cp -R pypy2-v5.3.1-linux64/* $OUT_PREFIX
 ln $OUT_PREFIX/bin/pypy $OUT_PREFIX/bin/python
@@ -2,4 +2,13 @@
 # Build Path: /app/.heroku/python/
 # Build Deps: libraries/sqlite
-source $(dirname $0)/pypy
+# NOTICE: This formula only works for the cedar-14 stack, not cedar.
 OUT_PREFIX=$1
 echo "Building PyPy..."
 SOURCE_TARBALL='https://bitbucket.org/pypy/pypy/downloads/pypy2-v5.6.0-linux64.tar.bz2'
 curl -L $SOURCE_TARBALL | tar jx
 cp -R pypy2-v5.6.0-linux64/* $OUT_PREFIX
 ln $OUT_PREFIX/bin/pypy $OUT_PREFIX/bin/python
@@ -2,4 +2,13 @@
 # Build Path: /app/.heroku/python/
 # Build Deps: libraries/sqlite
-source $(dirname $0)/pypy
+# NOTICE: This formula only works for the cedar-14 and heroku-16 stacks, not cedar.
 OUT_PREFIX=$1
 echo "Building PyPy..."
 SOURCE_TARBALL='https://bitbucket.org/pypy/pypy/downloads/pypy2-v5.7.0-linux64.tar.bz2'
 curl -L $SOURCE_TARBALL | tar jx
 cp -R pypy2-v5.7.0-linux64/* $OUT_PREFIX
 ln $OUT_PREFIX/bin/pypy $OUT_PREFIX/bin/python
@@ -2,4 +2,13 @@
 # Build Path: /app/.heroku/python/
 # Build Deps: libraries/sqlite
-source $(dirname $0)/pypy
+# NOTICE: This formula only works for the cedar-14 stack, not cedar.
 OUT_PREFIX=$1
 echo "Building PyPy..."
 SOURCE_TARBALL='https://bitbucket.org/pypy/pypy/downloads/pypy2-v5.7.1-linux64.tar.bz2'
 curl -L $SOURCE_TARBALL | tar jx
 cp -R pypy2-v5.7.1-linux64/* $OUT_PREFIX
 ln $OUT_PREFIX/bin/pypy $OUT_PREFIX/bin/python
@@ -1,5 +0,0 @@
 #!/usr/bin/env bash
 # Build Path: /app/.heroku/python/
 # Build Deps: libraries/sqlite
 source $(dirname $0)/pypy
@@ -1,23 +0,0 @@
 #!/usr/bin/env bash
 # fail hard
 set -o pipefail
 # fail harder
 set -eu
 OUT_PREFIX=$1
 dep_formula=${0#$WORKSPACE_DIR/} # this is the original script, e.g. pypy-5.3.1
 dep_name=$(basename $BASH_SOURCE) # this is us
 dep_version=${dep_formula##*"/${dep_name}-"} # "subtract" our name from full version name
 dep_package=${dep_name}-v${dep_version} # it's always "pypy2-…"
 dep_dirname=${dep_package}-linux64
 dep_archive_name=${dep_dirname}.tar.bz2
 dep_url="https://downloads.python.org/pypy/${dep_archive_name}"
 echo "Building PyPy…"
 echo "${dep_url}"
 curl -fL "${dep_url}" | tar jx -C "${OUT_PREFIX}" --strip-components 1 # extract to $OUT_PREFIX, drop the first directory level, which is the archive name
 ln "$OUT_PREFIX/bin/pypy" "$OUT_PREFIX/bin/python"
@@ -1,4 +0,0 @@
 #!/usr/bin/env bash
 # Build Path: /app/.heroku/python/
 source $(dirname $0)/pypy2.7
@@ -1,4 +0,0 @@
 #!/usr/bin/env bash
 # Build Path: /app/.heroku/python/
 source $(dirname $0)/pypy2.7
@@ -1,4 +0,0 @@
 #!/usr/bin/env bash
 # Build Path: /app/.heroku/python/
 source $(dirname $0)/pypy2.7
@@ -1,22 +0,0 @@
 #!/usr/bin/env bash
 # fail hard
 set -o pipefail
 # fail harder
 set -eu
 OUT_PREFIX=$1
 dep_formula=${0#$WORKSPACE_DIR/} # this is the original script, e.g. pypy-5.3.1
 dep_name=$(basename $BASH_SOURCE) # this is us
 dep_version=${dep_formula##*"/${dep_name}-"} # "subtract" our name from full version name
 dep_package=${dep_name}${dep_version_prefix:-}-v${dep_version}${dep_version_suffix:-}
 dep_dirname=${dep_package}-linux64
 dep_archive_name=${dep_dirname}.tar.bz2
 dep_url=https://bitbucket.org/pypy/pypy/downloads/${dep_archive_name}
 echo "Building PyPy3…"
 curl -L "${dep_url}" | tar jx -C "${OUT_PREFIX}" --strip-components 1 # extract to $OUT_PREFIX, drop the first directory level, which is the archive name
 ln "$OUT_PREFIX/bin/pypy3" "$OUT_PREFIX/bin/python"
@@ -2,4 +2,13 @@
 # Build Path: /app/.heroku/python/
 # Build Deps: libraries/sqlite
-source $(dirname $0)/pypy3
+# NOTICE: This formula only works for the cedar-14 stack, not cedar.
 OUT_PREFIX=$1
 echo "Building PyPy..."
 SOURCE_TARBALL='https://bitbucket.org/pypy/pypy/downloads/pypy3-2.4.0-linux64.tar.bz2'
 curl -L $SOURCE_TARBALL | tar jx
 cp -R pypy3-2.4.0-linux64/* $OUT_PREFIX
 ln $OUT_PREFIX/bin/pypy3 $OUT_PREFIX/bin/python
@@ -2,7 +2,13 @@
 # Build Path: /app/.heroku/python/
 # Build Deps: libraries/sqlite
-# version pypy3-5.5.0 is really called pypy3.3-v5.5.0-alpha
+# NOTICE: This formula only works for the cedar-14 stack, not cedar.
-dep_version_prefix=".3"
+
-dep_version_suffix="-alpha"
+OUT_PREFIX=$1
-source $(dirname $0)/pypy3
+
 echo "Building PyPy..."
 SOURCE_TARBALL='https://bitbucket.org/pypy/pypy/downloads/pypy3.3-v5.5.0-alpha-linux64.tar.bz2'
 curl -L $SOURCE_TARBALL | tar jx
 cp -R pypy3-v5.5.0-linux64/* $OUT_PREFIX
 ln $OUT_PREFIX/bin/pypy3 $OUT_PREFIX/bin/python
@@ -2,4 +2,11 @@
 # Build Path: /app/.heroku/python/
 # Build Deps: libraries/sqlite
-source $(dirname $0)/pypy3
+OUT_PREFIX=$1
 echo "Building PyPy..."
 SOURCE_TARBALL='https://bitbucket.org/pypy/pypy/downloads/pypy3-v5.7.1-linux64.tar.bz2'
 curl -L $SOURCE_TARBALL | tar jx
 cp -R pypy3-v5.7.1-linux64/* $OUT_PREFIX
 ln $OUT_PREFIX/bin/pypy3 $OUT_PREFIX/bin/python
@@ -1,5 +0,0 @@
 #!/usr/bin/env bash
 # Build Path: /app/.heroku/python/
 # Build Deps: libraries/sqlite
 source $(dirname $0)/pypy3
@@ -1,23 +0,0 @@
 #!/usr/bin/env bash
 # fail hard
 set -o pipefail
 # fail harder
 set -eu
 OUT_PREFIX=$1
 dep_formula=${0#$WORKSPACE_DIR/} # this is the original script, e.g. pypy-5.3.1
 dep_name=$(basename $BASH_SOURCE) # this is us
 dep_version=${dep_formula##*"/${dep_name}-"} # "subtract" our name from full version name
 dep_package=${dep_name}${dep_version_prefix:-}-v${dep_version}${dep_version_suffix:-}
 dep_dirname=${dep_package}-linux64
 dep_archive_name=${dep_dirname}.tar.bz2
 dep_url="https://downloads.python.org/pypy/${dep_archive_name}"
 echo "Building PyPy3…"
 echo "${dep_url}"
 curl -fL "${dep_url}" | tar jx -C "${OUT_PREFIX}" --strip-components 1 # extract to $OUT_PREFIX, drop the first directory level, which is the archive name
 ln "$OUT_PREFIX/bin/pypy3" "$OUT_PREFIX/bin/python"
@@ -1,4 +0,0 @@
 #!/usr/bin/env bash
 # Build Path: /app/.heroku/python/
 source $(dirname $0)/pypy3.6
@@ -1,4 +0,0 @@
 #!/usr/bin/env bash
 # Build Path: /app/.heroku/python/
 source $(dirname $0)/pypy3.6
@@ -1,4 +0,0 @@
 #!/usr/bin/env bash
 # Build Path: /app/.heroku/python/
 source $(dirname $0)/pypy3.6
@@ -1,4 +1,15 @@
 #!/usr/bin/env bash
 # Build Path: /app/.heroku/python/
 # Build Deps: libraries/sqlite
-source $(dirname $0)/python2
+OUT_PREFIX=$1
 echo "Building Python..."
 SOURCE_TARBALL='https://python.org/ftp/python/2.7.10/Python-2.7.10.tgz'
 curl -L $SOURCE_TARBALL | tar xz
 mv Python-2.7.10 src
 cd src
 ./configure --prefix=$OUT_PREFIX  --with-ensurepip=no
 make
 make install
@@ -1,4 +1,15 @@
 #!/usr/bin/env bash
 # Build Path: /app/.heroku/python/
 # Build Deps: libraries/sqlite
-source $(dirname $0)/python2
+OUT_PREFIX=$1
 echo "Building Python..."
 SOURCE_TARBALL='https://python.org/ftp/python/2.7.11/Python-2.7.11.tgz'
 curl -L $SOURCE_TARBALL | tar xz
 mv Python-2.7.11 src
 cd src
 ./configure --prefix=$OUT_PREFIX  --with-ensurepip=no
 make
 make install
@@ -1,4 +1,15 @@
 #!/usr/bin/env bash
 # Build Path: /app/.heroku/python/
 # Build Deps: libraries/sqlite
-source $(dirname $0)/python2
+OUT_PREFIX=$1
 echo "Building Python..."
 SOURCE_TARBALL='https://python.org/ftp/python/2.7.12/Python-2.7.12.tgz'
 curl -L $SOURCE_TARBALL | tar xz
 mv Python-2.7.12 src
 cd src
 ./configure --prefix=$OUT_PREFIX  --with-ensurepip=no
 make
 make install
@@ -1,4 +1,15 @@
 #!/usr/bin/env bash
 # Build Path: /app/.heroku/python/
 # Build Deps: libraries/sqlite
-source $(dirname $0)/python2
+OUT_PREFIX=$1
 echo "Building Python..."
 SOURCE_TARBALL='https://python.org/ftp/python/2.7.13/Python-2.7.13.tgz'
 curl -L $SOURCE_TARBALL | tar xz
 mv Python-2.7.13 src
 cd src
 ./configure --prefix=$OUT_PREFIX  --enable-unicode=ucs4 --with-ensurepip=no
 make
 make install
@@ -1,4 +0,0 @@
 #!/usr/bin/env bash
 # Build Path: /app/.heroku/python/
 source $(dirname $0)/python2
@@ -1,4 +0,0 @@
 #!/usr/bin/env bash
 # Build Path: /app/.heroku/python/
 source $(dirname $0)/python2
@@ -1,4 +0,0 @@
 #!/usr/bin/env bash
 # Build Path: /app/.heroku/python/
 source $(dirname $0)/python2
@@ -1,4 +0,0 @@
 #!/usr/bin/env bash
 # Build Path: /app/.heroku/python/
 source $(dirname $0)/python2
@@ -1,4 +0,0 @@
 #!/usr/bin/env bash
 # Build Path: /app/.heroku/python/
 source $(dirname $0)/python2
@@ -1,4 +1,15 @@
 #!/usr/bin/env bash
 # Build Path: /app/.heroku/python/
 # Build Deps: libraries/sqlite
-source $(dirname $0)/python2
+OUT_PREFIX=$1
 echo "Building Python..."
 SOURCE_TARBALL='https://python.org/ftp/python/2.7.9/Python-2.7.9.tgz'
 curl -L $SOURCE_TARBALL | tar xz
 mv Python-2.7.9 src
 cd src
 ./configure --prefix=$OUT_PREFIX  --with-ensurepip=no
 make
 make install
@@ -1,4 +0,0 @@
 #!/usr/bin/env bash
 # Build Path: /app/.heroku/python/
 source $(dirname $0)/python3
@@ -1,4 +0,0 @@
 #!/usr/bin/env bash
 # Build Path: /app/.heroku/python/
 source $(dirname $0)/python3
@@ -1,4 +0,0 @@
 #!/usr/bin/env bash
 # Build Path: /app/.heroku/python/
 source $(dirname $0)/python3
@@ -1,4 +0,0 @@
 #!/usr/bin/env bash
 # Build Path: /app/.heroku/python/
 source $(dirname $0)/python3
@@ -1,4 +0,0 @@
 #!/usr/bin/env bash
 # Build Path: /app/.heroku/python/
 source $(dirname $0)/python3
@@ -1,4 +1,18 @@
 #!/usr/bin/env bash
 # Build Path: /app/.heroku/python/
 # Build Deps: libraries/sqlite
 OUT_PREFIX=$1
 echo "Building Python..."
 SOURCE_TARBALL='https://python.org/ftp/python/3.5.2/Python-3.5.2.tgz'
 curl -L $SOURCE_TARBALL | tar xz
 mv Python-3.5.2 src
 cd src
 ./configure --prefix=$OUT_PREFIX --with-ensurepip=no
 make
 make install
 # ln $OUT_PREFIX/bin/python3 $OUT_PREFIX/bin/python
 source $(dirname $0)/python3
@@ -1,4 +0,0 @@
 #!/usr/bin/env bash
 # Build Path: /app/.heroku/python/
 source $(dirname $0)/python3
@@ -1,4 +0,0 @@
 #!/usr/bin/env bash
 # Build Path: /app/.heroku/python/
 source $(dirname $0)/python3
@@ -1,4 +0,0 @@
 #!/usr/bin/env bash
 # Build Path: /app/.heroku/python/
 source $(dirname $0)/python3
@@ -1,4 +0,0 @@
 #!/usr/bin/env bash
 # Build Path: /app/.heroku/python/
 source $(dirname $0)/python3
@@ -1,4 +0,0 @@
 #!/usr/bin/env bash
 # Build Path: /app/.heroku/python/
 source $(dirname $0)/python3
@@ -1,4 +0,0 @@
 #!/usr/bin/env bash
 # Build Path: /app/.heroku/python/
 source $(dirname $0)/python3
@@ -1,4 +1,18 @@
 #!/usr/bin/env bash
 # Build Path: /app/.heroku/python/
 # Build Deps: libraries/sqlite
 OUT_PREFIX=$1
 echo "Building Python..."
 SOURCE_TARBALL='https://python.org/ftp/python/3.6.0/Python-3.6.0.tgz'
 curl -L $SOURCE_TARBALL | tar xz
 mv Python-3.6.0 src
 cd src
 ./configure --prefix=$OUT_PREFIX --with-ensurepip=no
 make
 make install
 ln $OUT_PREFIX/bin/python3 $OUT_PREFIX/bin/python
 source $(dirname $0)/python3
@@ -1,4 +1,18 @@
 #!/usr/bin/env bash
 # Build Path: /app/.heroku/python/
 # Build Deps: libraries/sqlite
 OUT_PREFIX=$1
 echo "Building Python..."
 SOURCE_TARBALL='https://python.org/ftp/python/3.6.1/Python-3.6.1.tgz'
 curl -L $SOURCE_TARBALL | tar xz
 mv Python-3.6.1 src
 cd src
 ./configure --prefix=$OUT_PREFIX --with-ensurepip=no
 make
 make install
 ln $OUT_PREFIX/bin/python3 $OUT_PREFIX/bin/python
 source $(dirname $0)/python3
@@ -1,4 +0,0 @@
 #!/usr/bin/env bash
 # Build Path: /app/.heroku/python/
 source $(dirname $0)/python3
@@ -1,4 +0,0 @@
 #!/usr/bin/env bash
 # Build Path: /app/.heroku/python/
 source $(dirname $0)/python3
@@ -1,4 +0,0 @@
 #!/usr/bin/env bash
 # Build Path: /app/.heroku/python/
 source $(dirname $0)/python3
--- a/Show More
+++ b/Show More