Release v184 (#1106)

Now `make deploy-runtimes` will build binaries for Heroku-20 by default
too, without the need to pass it in via an explicit `STACKS=...`list.

Closes @W-8233698@.

[skip changelog]

.travis.yml

@@ -34,6 +34,10 @@ env:
     - 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

CHANGELOG.md

@@ -3,6 +3,15 @@
 ## Unreleased
 
 
+## 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).

Gemfile.lock

@@ -3,17 +3,17 @@ GEM
   specs:
     diff-lcs (1.4.4)
     erubis (2.7.0)
-    excon (0.76.0)
+    excon (0.78.0)
     heroics (0.1.1)
       erubis (~> 2.0)
       excon
       moneta
       multi_json (>= 1.9.2)
-    heroku_hatchet (7.3.0)
+    heroku_hatchet (7.3.3)
       excon (~> 0)
       platform-api (~> 3)
       rrrretry (~> 1)
-      thor (~> 0)
+      thor (~> 1)
       threaded (~> 0)
     moneta (1.0.0)
     multi_json (1.15.0)
@@ -43,7 +43,7 @@ GEM
     rspec-retry (0.6.2)
       rspec-core (> 3.3)
     rspec-support (3.9.3)
-    thor (0.20.3)
+    thor (1.0.1)
     threaded (0.0.4)
 
 PLATFORMS

Makefile

@@ -2,7 +2,7 @@
 .PHONY: check test builder-image buildenv deploy-runtimes tools
 
 STACK ?= heroku-18
-STACKS ?= cedar-14 heroku-16 heroku-18
+STACKS ?= cedar-14 heroku-16 heroku-18 heroku-20
 TEST_CMD ?= test/run-versions && test/run-features && test/run-deps
 ENV_FILE ?= builds/dockerenv.default
 BUILDER_IMAGE_PREFIX := heroku-python-build

bin/compile

@@ -15,10 +15,8 @@
 # Fail fast and fail hard.
 set -eo pipefail
 
-# Boostrap the Buildpack Standard Library.
+# Used by buildpack-stdlib's metrics features.
-# Disable unused env var warning since shellcheck doesn't know about the stdlib.
+export BPLOG_PREFIX="buildpack.python"
-# shellcheck disable=2034
-BPLOG_PREFIX="buildpack.python"
 export BUILDPACK_LOG_FILE=${BUILDPACK_LOG_FILE:-/dev/null}
 
 [ "$BUILDPACK_XTRACE" ] && set -o xtrace

bin/steps/gdal

@@ -21,8 +21,11 @@ source "$BIN_DIR/utils"
 # If GDAL exists within requirements, use vendored gdal.
 if (pip-grep -s requirements.txt GDAL gdal pygdal &> /dev/null) then
 
-  if [ ! -f ".heroku/vendor/bin/gdalserver" ]; then
+  if [[ ! -f ".heroku/vendor/bin/gdalserver" && "${STACK}" == 'heroku-20' ]]; then
+    puts-warn "The buildpack's built-in GDAL functonality is not supported on Heroku-20."
+    puts-warn "Please use this buildpack instead: https://github.com/heroku/heroku-geo-buildpack"
 
+  elif [[ ! -f ".heroku/vendor/bin/gdalserver" ]]; then
     puts-warn "The vendored GDAL package in the Heroku Python Buildpack now deprecated."
     puts-warn "To enable GDAL use an alternative buildpack is available here - https://github.com/heroku/heroku-geo-buildpack"
 

bin/steps/geo-libs

@@ -20,8 +20,11 @@ PKG_CONFIG_PATH="/app/.heroku/vendor/lib/pkgconfig:$PKG_CONFIG_PATH"
 # shellcheck source=bin/utils
 source "$BIN_DIR/utils"
 
-# If GDAL exists within requirements, use vendored gdal.
+if [[ "$BUILD_WITH_GEO_LIBRARIES" && "${STACK}" == 'heroku-20' ]]; then
-if [[ "$BUILD_WITH_GEO_LIBRARIES" ]]; then
+  puts-warn "The GDAL, GEOS and PROJ binaries and BUILD_WITH_GEO_LIBRARIES functonality is not supported on Heroku-20."
+  puts-warn "Please use this buildpack for GDAL, GEOS and PROJ: https://github.com/heroku/heroku-geo-buildpack"
+  puts-warn "To hide this message, unset the BUILD_WITH_GEO_LIBRARIES variable using: heroku config:unset BUILD_WITH_GEO_LIBRARIES"
+elif [[ "$BUILD_WITH_GEO_LIBRARIES" ]]; then
   mcount "buildvar.BUILD_WITH_GEO_LIBRARIES"
 
   puts-warn "The GDAL, GEOS and PROJ binaries and BUILD_WITH_GEO_LIBRARIES functonality are now deprecated."

bin/utils

@@ -2,12 +2,13 @@
 shopt -s extglob
 shopt -s nullglob
 
-# The standard library.
+# This is necessary since this script is sometimes sourced from
-if [[ ! -f  /tmp/stdlib.sh ]]; then
+# subshells that don't have the variables from bin/compile.
-  curl --retry 3 -s https://lang-common.s3.amazonaws.com/buildpack-stdlib/v8/stdlib.sh > /tmp/stdlib.sh
+# Remove this once we no longer wrap all the things in `sub_env`.
-fi
+BIN_DIR=$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)
-# shellcheck source=/dev/null
+ROOT_DIR=$(dirname "${BIN_DIR}")
-source /tmp/stdlib.sh
+# shellcheck source=vendor/buildpack-stdlib_v8.sh
+source "${ROOT_DIR}/vendor/buildpack-stdlib_v8.sh"
 
 if [ "$(uname)" == Darwin ]; then
     sed() { command sed -l "$@"; }

builds/heroku-20.Dockerfile

@@ -0,0 +1,20 @@
+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

test/fixtures/nltk/runtime.txt

@@ -1 +0,0 @@
-python-3.6.6

test/fixtures/pipenv-full-version/Pipfile

@@ -6,4 +6,4 @@ verify_ssl = true
 requests = "*"
 
 [requires]
-python_full_version = "3.6.3"
+python_full_version = "3.7.8"

test/fixtures/pipenv-full-version/Pipfile.lock

@@ -1,24 +1,11 @@
 {
     "_meta": {
         "hash": {
-            "sha256": "22a052f4d1cfe6518b2f236fe45c3208c587a9ab1323bdd390632e27278b541e"
+            "sha256": "8a36860f0f9cb55716222098062cea5c5e0f8127cafb9d0c694de327bac9fbc0"
-        },
-        "host-environment-markers": {
-            "implementation_name": "cpython",
-            "implementation_version": "3.6.3",
-            "os_name": "posix",
-            "platform_machine": "x86_64",
-            "platform_python_implementation": "CPython",
-            "platform_release": "16.7.0",
-            "platform_system": "Darwin",
-            "platform_version": "Darwin Kernel Version 16.7.0: Thu Jun 15 17:36:27 PDT 2017; root:xnu-3789.70.16~2/RELEASE_X86_64",
-            "python_full_version": "3.6.3",
-            "python_version": "3.6",
-            "sys_platform": "darwin"
         },
         "pipfile-spec": 6,
         "requires": {
-            "python_full_version": "3.6.3"
+            "python_full_version": "3.7.8"
         },
         "sources": [
             {

test/fixtures/pypy2_7_warn/runtime.txt

@@ -1 +1 @@
-pypy2.7-7.2.0
+pypy2.7-7.3.1

test/fixtures/pypy3_6_warn/runtime.txt

@@ -1 +1 @@
-pypy3.6-7.2.0
+pypy3.6-7.3.1

test/fixtures/python2_warn/requirements.txt

@@ -1 +0,0 @@
-requests

test/fixtures/python3_4_warn/requirements.txt

@@ -1 +0,0 @@
-flask

test/fixtures/python3_5_warn/requirements.txt

@@ -1 +0,0 @@
-flask

test/fixtures/python3_6/runtime.txt

@@ -1 +1 @@
-python-3.6.8
+python-3.6.12

test/fixtures/python3_6_warn/requirements.txt

@@ -1 +0,0 @@
-requests

test/fixtures/python3_6_warn/runtime.txt

@@ -1 +1 @@
-python-3.6.7
+python-3.6.11

test/fixtures/python3_7/runtime.txt

@@ -1 +1 @@
-python-3.7.2
+python-3.7.9

test/fixtures/python3_7_warn/requirements.txt

@@ -1 +0,0 @@
-requests

test/fixtures/python3_7_warn/runtime.txt

@@ -1 +1 @@
-python-3.7.1
+python-3.7.8

test/fixtures/python3_8/runtime.txt

@@ -1 +1 @@
-python-3.8.2
+python-3.8.6

test/fixtures/python3_8_warn/requirements.txt

@@ -1 +0,0 @@
-requests

test/fixtures/python3_8_warn/runtime.txt

@@ -1 +1 @@
-python-3.8.0
+python-3.8.5

test/fixtures/pythonDefault/requirements.txt

@@ -1 +0,0 @@
-flask

test/run-deps

@@ -21,16 +21,13 @@ testGEOS() {
   local env_dir="$(mktmpdir)"
   echo '1' > "${env_dir}/BUILD_WITH_GEO_LIBRARIES"
   compile 'geos' '' "${env_dir}"
-  assertCaptured "geos"
+  if [[ $STACK == "heroku-20" ]]; then
-  assertCapturedSuccess
+    assertCaptured " !     The GDAL, GEOS and PROJ binaries and BUILD_WITH_GEO_LIBRARIES functonality is not supported on Heroku-20."
-}
+  else
-
+    assertCaptured " !     The GDAL, GEOS and PROJ binaries and BUILD_WITH_GEO_LIBRARIES functonality are now deprecated."
-testGEOSDeprecation() {
+  fi
-  local env_dir="$(mktmpdir)"
+  # This should assertCapturedError on Heroku-20, but the test doesn't actually
-  echo '1' > "${env_dir}/BUILD_WITH_GEO_LIBRARIES"
+  # install anything that uses GEOS so succeeds (see W-8145375)
-  compile 'geos' '' "${env_dir}"
-  assertCaptured " !     The GDAL, GEOS and PROJ binaries and BUILD_WITH_GEO_LIBRARIES functonality are now deprecated.
- !     An alternative buildpack to enable GDAL, GEOS and PROJ use is available here - https://github.com/heroku/heroku-geo-buildpack"
   assertCapturedSuccess
 }
 
@@ -55,17 +52,16 @@ testPsycopg2() {
 }
 
 testPysqlite() {
+  # pysqlite does not support Python 3 (since the sqlite3 stdlib can be used there),
+  # so we have to test with Python 2, which we've not made available for Heroku-20.
+  if [[ $STACK == "heroku-20" ]]; then
+    return
+  fi
   compile "pysqlite"
   assertCaptured "pysqlite"
   assertCapturedSuccess
 }
 
-testSqliteInstall() {
-  compile "pythonDefault"
-  assertNotCaptured "Sqlite3 failed to install."
-  assertCapturedSuccess
-}
-
 testCffi() {
   compile "cffi"
   assertCaptured "cffi"

test/run-features

@@ -59,24 +59,33 @@ testPipenvLock() {
   assertCapturedSuccessWithStdErr
 }
 
-testPipenvVersion() {
+testPipenvPythonVersion3_6() {
   compile "pipenv-version"
-  assertCaptured $DEFAULT_PYTHON_VERSION
+  assertCaptured "Installing ${LATEST_36}"
   # Can't use `assertCapturedSuccess` since stderr contains:
   # "cp: cannot stat '/tmp/build_*/requirements.txt': No such file or directory" (W-7924941)
   assertCapturedSuccessWithStdErr
 }
 
-testPipenvVersion2() {
+testPipenvPythonVersion2_7() {
+  # Python 2.7 is EOL, so it has not been built for Heroku-20.
+  if [[ $STACK == "heroku-20" ]]; then
+    return
+  fi
   compile "pipenv-version2"
-  assertCaptured $LATEST_27
+  assertCaptured "Installing ${LATEST_27}"
   # Can't use `assertCapturedSuccess` since stderr contains:
   # "cp: cannot stat '/tmp/build_*/requirements.txt': No such file or directory" (W-7924941)
   assertCapturedSuccessWithStdErr
 }
-testPipenvFullVersion() {
+
+testPipenvPythonFullVersion() {
+  # Python 3.7+ requires newer libssl than is present on Cedar-14.
+  if [[ "${STACK}" = "cedar-14" ]]; then
+    return
+  fi
   compile "pipenv-full-version"
-  assertCaptured "3.6.3"
+  assertCaptured "3.7.8"
   # Can't use `assertCapturedSuccess` since stderr contains:
   # "cp: cannot stat '/tmp/build_*/requirements.txt': No such file or directory" (W-7924941)
   assertCapturedSuccessWithStdErr
@@ -107,6 +116,7 @@ testHooks() {
   local expected_env_vars=(
     _
     BIN_DIR
+    BPLOG_PREFIX
     BUILD_DIR
     BUILDPACK_LOG_FILE
     CACHE_DIR

test/run-versions

@@ -4,59 +4,78 @@
 # shellcheck source=bin/default_pythons
 source "bin/default_pythons"
 
-testPythonDefault() {
+testPythonVersionUnspecified() {
-  updateVersion "pythonDefault" $DEFAULT_PYTHON_VERSION
+  compile "python_version_unspecified"
-  compile "pythonDefault"
+  assertCaptured "Installing ${DEFAULT_PYTHON_VERSION}"
-  assertCaptured $DEFAULT_PYTHON_VERSION
   assertNotCaptured "security update"
   assertCaptured "Installing pip 20.1.1, setuptools 47.1.1 and wheel 0.34.2"
   assertCaptured "Installing SQLite3"
   assertCapturedSuccess
 }
 
-testPython2() {
+testPython2_7() {
-    updateVersion "python2" $LATEST_27
+  # Python 2.7 is EOL, so it has not been built for Heroku-20.
-    echo $LATEST_27 > "runtime.txt"
+  if [[ $STACK == "heroku-20" ]]; then
-    compile "python2"
+    return
-    assertCaptured $LATEST_27
+  fi
-    assertCaptured "python-2-7-eol-faq";
+  compile "python2"
-    assertNotCaptured "security update"
+  assertCaptured "Installing ${LATEST_27}"
-    assertCaptured "Installing pip 20.1.1, setuptools 44.1.1 and wheel 0.34.2"
+  assertCaptured "python-2-7-eol-faq";
-    assertCaptured "Installing SQLite3"
+  assertNotCaptured "security update"
-    assertCapturedSuccess
+  assertCaptured "Installing pip 20.1.1, setuptools 44.1.1 and wheel 0.34.2"
+  assertCaptured "Installing SQLite3"
+  assertCapturedSuccess
 }
 
-testPython2_warn() {
+testPython2_7_warn() {
-    compile "python2_warn"
+  # Python 2.7 is EOL, so it has not been built for Heroku-20.
-    assertCaptured "python-2.7.15"
+  if [[ $STACK == "heroku-20" ]]; then
-    assertCaptured "python-2-7-eol-faq";
+    return
-    assertCaptured "Only the latest version"
+  fi
-    assertCaptured "Installing SQLite3"
+  compile "python2_warn"
-    assertCapturedSuccess
+  assertCaptured "Installing python-2.7.15"
+  assertCaptured "python-2-7-eol-faq";
+  assertCaptured "Only the latest version"
+  assertCaptured "${LATEST_27}"
+  assertCapturedSuccess
 }
 
 testPython3_4() {
+  # Python 3.4 is EOL, so it has not been built for Heroku-20.
+  if [[ $STACK == "heroku-20" ]]; then
+    return
+  fi
   compile "python3_4"
-  assertCaptured $LATEST_34
+  assertCaptured "Installing ${LATEST_34}"
   assertNotCaptured "security update"
   assertCaptured "Installing pip 19.1.1, setuptools 43.0.0 and wheel 0.33.6"
+  assertCaptured "Installing SQLite3"
   # Can't use `assertCapturedSuccess` since Pip outputs a Python 3.4 EOL warning to stderr,
   # and the newest Pip that works on Python 3.4 doesn't support `PIP_NO_PYTHON_VERSION_WARNING`.
   assertCapturedSuccessWithStdErr
 }
 
 testPython3_4_warn() {
+  # Python 3.4 is EOL, so it has not been built for Heroku-20.
+  if [[ $STACK == "heroku-20" ]]; then
+    return
+  fi
   compile "python3_4_warn"
-  assertCaptured "python-3.4.9"
+  assertCaptured "Installing python-3.4.9"
   assertCaptured "security update!"
+  assertCaptured "${LATEST_34}"
   # Can't use `assertCapturedSuccess` since Pip outputs a Python 3.4 EOL warning to stderr,
   # and the newest Pip that works on Python 3.4 doesn't support `PIP_NO_PYTHON_VERSION_WARNING`.
   assertCapturedSuccessWithStdErr
 }
 
 testPython3_5() {
+  # Python 3.5 is EOL, so it has not been built for Heroku-20.
+  if [[ $STACK == "heroku-20" ]]; then
+    return
+  fi
   compile "python3_5"
-  assertCaptured $LATEST_35
+  assertCaptured "Installing ${LATEST_35}"
   assertNotCaptured "security update"
   assertCaptured "Installing pip 20.1.1, setuptools 47.1.1 and wheel 0.34.2"
   assertCaptured "Installing SQLite3"
@@ -64,16 +83,20 @@ testPython3_5() {
 }
 
 testPython3_5_warn() {
+  # Python 3.5 is EOL, so it has not been built for Heroku-20.
+  if [[ $STACK == "heroku-20" ]]; then
+    return
+  fi
   compile "python3_5_warn"
-  assertCaptured "python-3.5.6"
+  assertCaptured "Installing python-3.5.6"
   assertCaptured "security update!"
+  assertCaptured "${LATEST_35}"
   assertCapturedSuccess
 }
 
 testPython3_6() {
-  updateVersion "python3_6" $LATEST_36
   compile "python3_6"
-  assertCaptured $LATEST_36
+  assertCaptured "Installing ${LATEST_36}"
   assertNotCaptured "security update"
   assertCaptured "Installing pip 20.1.1, setuptools 47.1.1 and wheel 0.34.2"
   assertCaptured "Installing SQLite3"
@@ -82,62 +105,60 @@ testPython3_6() {
 
 testPython3_6_warn() {
   compile "python3_6_warn"
-  assertCaptured "python-3.6.7"
+  assertCaptured "Installing python-3.6.11"
   assertCaptured "security update!"
-  assertCaptured "Installing SQLite3"
+  assertCaptured "${LATEST_36}"
   assertCapturedSuccess
 }
 
 testPython3_7() {
-  updateVersion "python3_7" $LATEST_37
+  # Python 3.7+ requires newer libssl than is present on Cedar-14.
-  compile "python3_7"
+  if [[ "${STACK}" = "cedar-14" ]]; then
-  if [[ $STACK = "cedar-14" ]]; then
+    return
-    assertCapturedError
-  else
-    assertNotCaptured "security update"
-    assertCaptured $LATEST_37
-    assertCaptured "Installing pip 20.1.1, setuptools 47.1.1 and wheel 0.34.2"
-    assertCaptured "Installing SQLite3"
-    assertCapturedSuccess
   fi
+  compile "python3_7"
+  assertCaptured "Installing ${LATEST_37}"
+  assertNotCaptured "security update"
+  assertCaptured "Installing pip 20.1.1, setuptools 47.1.1 and wheel 0.34.2"
+  assertCaptured "Installing SQLite3"
+  assertCapturedSuccess
 }
 
 testPython3_7_warn() {
-  compile "python3_7_warn"
+  # Python 3.7+ requires newer libssl than is present on Cedar-14.
-  if [[ $STACK = "cedar-14" ]]; then
+  if [[ "${STACK}" = "cedar-14" ]]; then
-    assertCapturedError
+    return
-  else
-    assertCaptured "python-3.7.1"
-    assertCaptured "security update!"
-    assertCaptured "Installing SQLite3"
-    assertCapturedSuccess
   fi
+  compile "python3_7_warn"
+  assertCaptured "Installing python-3.7.8"
+  assertCaptured "security update!"
+  assertCaptured "${LATEST_37}"
+  assertCapturedSuccess
 }
 
 testPython3_8() {
-  updateVersion "python3_8" $LATEST_38
+  # Python 3.7+ requires newer libssl than is present on Cedar-14.
-  compile "python3_8"
+  if [[ "${STACK}" = "cedar-14" ]]; then
-  if [[ $STACK = "cedar-14" ]]; then
+    return
-    assertCapturedError
-  else
-    assertNotCaptured "security update"
-    assertCaptured $LATEST_38
-    assertCaptured "Installing pip 20.1.1, setuptools 47.1.1 and wheel 0.34.2"
-    assertCaptured "Installing SQLite3"
-    assertCapturedSuccess
   fi
+  compile "python3_8"
+  assertCaptured "Installing ${LATEST_38}"
+  assertNotCaptured "security update"
+  assertCaptured "Installing pip 20.1.1, setuptools 47.1.1 and wheel 0.34.2"
+  assertCaptured "Installing SQLite3"
+  assertCapturedSuccess
 }
 
 testPython3_8_warn() {
-  compile "python3_8_warn"
+  # Python 3.7+ requires newer libssl than is present on Cedar-14.
-  if [[ $STACK = "cedar-14" ]]; then
+  if [[ "${STACK}" = "cedar-14" ]]; then
-    assertCapturedError
+    return
-  else
-    assertCaptured "python-3.8.0"
-    assertCaptured "security update!"
-    assertCaptured "Installing SQLite3"
-    assertCapturedSuccess
   fi
+  compile "python3_8_warn"
+  assertCaptured "Installing python-3.8.5"
+  assertCaptured "security update!"
+  assertCaptured "${LATEST_38}"
+  assertCapturedSuccess
 }
 
 testPython3_9() {
@@ -146,8 +167,8 @@ testPython3_9() {
     return
   fi
   compile "python3_9"
+  assertCaptured "Installing ${LATEST_39}"
   assertNotCaptured "security update"
-  assertCaptured $LATEST_39
   assertCaptured "Installing pip 20.1.1, setuptools 47.1.1 and wheel 0.34.2"
   assertCaptured "Installing SQLite3"
   assertCapturedSuccess
@@ -163,8 +184,9 @@ testPython3_9_warn() {
     return
   fi
   compile "python3_9_warn"
-  assertCaptured "python-3.9.0"
+  assertCaptured "Installing python-3.9.0"
   assertCaptured "security update!"
+  assertCaptured "${LATEST_39}"
   assertCapturedSuccess
 }
 
@@ -177,67 +199,58 @@ testPythonVersionInvalid() {
 
 testPypy3_6() {
   compile "pypy3_6"
-  assertCaptured "Installing pypy"
+  assertCaptured "Installing ${LATEST_PYPY_36}"
   assertNotCaptured "security update"
-  assertCaptured "$LATEST_PYPY_36"
   assertCaptured "Installing pip 20.1.1, setuptools 47.1.1 and wheel 0.34.2"
   assertCapturedSuccess
 }
 
 testPypy3_6_warn() {
   compile "pypy3_6_warn"
-  if [[ $STACK = "cedar-14" ]]; then
+  assertCaptured "Installing pypy3.6-7.3.1"
-    assertCapturedError
+  assertCaptured "security update!"
-  else
+  assertCaptured "${LATEST_PYPY_36}"
-    assertCaptured "Installing pypy"
+  assertCapturedSuccess
-    assertCaptured "security update!"
-    assertCaptured "$LATEST_PYPY_36"
-    assertCapturedSuccess
-  fi
 }
 
 testPypy2_7() {
   compile "pypy2_7"
-  assertCaptured "Installing pypy"
+  assertCaptured "Installing ${LATEST_PYPY_27}"
   assertNotCaptured "security update"
-  assertCaptured "$LATEST_PYPY_27"
   assertCaptured "Installing pip 20.1.1, setuptools 44.1.1 and wheel 0.34.2"
   assertCapturedSuccess
 }
 
 testPypy2_7_warn() {
   compile "pypy2_7_warn"
-  if [[ $STACK = "cedar-14" ]]; then
+  assertCaptured "Installing pypy2.7-7.3.1"
-    assertCapturedError
+  assertCaptured "security update!"
-  else
+  assertCaptured "${LATEST_PYPY_27}"
-    assertCaptured "Installing pypy"
+  assertCapturedSuccess
-    assertCaptured "security update!"
-    assertCaptured "$LATEST_PYPY_27"
-    assertCapturedSuccess
-  fi
 }
 
 testStickyPythonVersion() {
   local cache_dir="$(mktmpdir)"
   compile "python3_6_warn" "$cache_dir"
-  assertCaptured "Installing python-3.6.7"
+  assertCaptured "Installing python-3.6.11"
   assertCapturedSuccess
-  compile "no-runtime-txt" "$cache_dir"
+  compile "python_version_unspecified" "$cache_dir"
-  assertCaptured "Installing python-3.6.7"
+  assertNotCaptured "Installing python"
+  assertCaptured "security update!"
   assertCapturedSuccess
   # Whilst this file seems like an implementation detail (so something that should
   # not be tested), we must guarantee the filename remains consistent for backwards
   # compatibility across buildpack versions for already-built apps.
-  assertFile "python-3.6.7" ".heroku/python-version"
+  assertFile "python-3.6.11" ".heroku/python-version"
 }
 
 testPythonVersionChange() {
   local cache_dir="$(mktmpdir)"
   compile "python3_6_warn" "$cache_dir"
-  assertCaptured "Installing python-3.6.7"
+  assertCaptured "Installing python-3.6.11"
   assertCapturedSuccess
   compile "python3_6" "$cache_dir"
-  assertCaptured "Found python-3.6.7, removing"
+  assertCaptured "Found python-3.6.11, removing"
   assertCapturedSuccess
 }
 

test/utils

@@ -56,11 +56,6 @@ resetCapture()
   unset rtrn # deprecated
 }
 
-updateVersion()
-{
-  echo "$2" > "test/fixtures/${1}/runtime.txt"
-}
-
 assertCapturedEquals()
 {
   assertEquals "$@" "$(cat ${STD_OUT})"

vendor/buildpack-stdlib_v8.sh

@@ -0,0 +1,195 @@
+#!/usr/bin/env bash
+
+# From:
+# https://raw.githubusercontent.com/heroku/buildpack-stdlib/v8/stdlib.sh
+
+# Buildpack defaults
+# ---------------
+
+export BUILDPACK_LOG_FILE="${BUILDPACK_LOG_FILE:-/dev/null}"
+
+# Standard Output
+# ---------------
+
+# Buildpack Steps.
+puts_step() {
+  if [[ "$*" == "-" ]]; then
+    read -r output
+  else
+    output=$*
+  fi
+  echo -e "\\e[1m\\e[36m=== $output\\e[0m"
+  unset output
+}
+
+# Buildpack Error.
+puts_error() {
+  if [[ "$*" == "-" ]]; then
+    read -r output
+  else
+    output=$*
+  fi
+  echo -e "\\e[1m\\e[31m=!= $output\\e[0m"
+}
+
+# Buildpack Warning.
+puts_warn() {
+  if [[ "$*" == "-" ]]; then
+    read -r output
+  else
+    output=$*
+  fi
+  echo -e "\\e[1m\\e[33m=!= $output\\e[0m"
+}
+
+# Is verbose set?
+is_verbose() {
+  if [[ -n $BUILDPACK_VERBOSE ]]; then
+    return 0
+  else
+    return 1
+  fi
+}
+
+# Buildpack Verbose.
+puts_verbose() {
+  if is_verbose; then
+    if [[ "$*" == "-" ]]; then
+      read -r output
+    else
+      output=$*
+    fi
+    echo "$output"
+    unset output
+  fi
+}
+
+# Buildpack Utilities
+# -------------------
+
+# Usage: $ set-env key value
+# NOTICE: Expects PROFILE_PATH & EXPORT_PATH to be set!
+set_env() {
+  # TODO: automatically create profile path directory if it doesn't exist.
+  echo "export $1=$2" >> "$PROFILE_PATH"
+  echo "export $1=$2" >> "$EXPORT_PATH"
+}
+
+# Usage: $ set-default-env key value
+# NOTICE: Expects PROFILE_PATH & EXPORT_PATH to be set!
+set_default_env() {
+  echo "export $1=\${$1:-$2}" >> "$PROFILE_PATH"
+  echo "export $1=\${$1:-$2}" >> "$EXPORT_PATH"
+}
+
+# Usage: $ un-set-env key
+# NOTICE: Expects PROFILE_PATH to be set!
+un_set_env() {
+  echo "unset $1" >> "$PROFILE_PATH"
+}
+
+# Usage: $ _env-blacklist pattern
+# Outputs a regex of default blacklist env vars.
+_env_blacklist() {
+  local regex=${1:-''}
+  if [ -n "$regex" ]; then
+    regex="|$regex"
+  fi
+  echo "^(PATH|GIT_DIR|CPATH|CPPATH|LD_PRELOAD|LIBRARY_PATH$regex)$"
+}
+
+# Usage: $ export-env ENV_DIR WHITELIST BLACKLIST
+# Exports the environment variables defined in the given directory.
+export_env() {
+  local env_dir=${1:-$ENV_DIR}
+  local whitelist=${2:-''}
+  local blacklist
+  blacklist="$(_env_blacklist "$3")"
+  if [ -d "$env_dir" ]; then
+    # Environment variable names won't contain characters affected by:
+    # shellcheck disable=SC2045
+    for e in $(ls "$env_dir"); do
+      echo "$e" | grep -E "$whitelist" | grep -qvE "$blacklist" &&
+      export "$e=$(cat "$env_dir/$e")"
+      :
+    done
+  fi
+}
+
+# Usage: $ sub-env command
+# Runs a subshell of specified command with user-provided config.
+# NOTICE: Expects ENV_DIR to be set. WHITELIST & BLACKLIST are optional.
+# Examples:
+#    WHITELIST=${2:-''}
+#    BLACKLIST=${3:-'^(GIT_DIR|PYTHONHOME|LD_LIBRARY_PATH|LIBRARY_PATH|PATH)$'}
+sub_env() {
+  (
+    # TODO: Fix https://github.com/heroku/buildpack-stdlib/issues/37
+    # shellcheck disable=SC2153
+    export_env "$ENV_DIR" "$WHITELIST" "$BLACKLIST"
+
+    "$@"
+  )
+}
+
+# Logging
+# -------
+
+# Notice: These functions expect BPLOG_PREFIX and BUILDPACK_LOG_FILE to be defined (BUILDPACK_LOG_FILE can point to /dev/null if not provided by the buildpack).
+# Example: BUILDPACK_LOG_FILE=${BUILDPACK_LOG_FILE:-/dev/null}; BPLOG_PREFIX="buildpack.go"
+
+# Returns now, in milleseconds. Useful for logging.
+# Example: $ let start=$(nowms); sleep 30; mtime "glide.install.time" "${start}"
+nowms() {
+  date +%s%3N
+}
+
+# Log arbitrary data to the logfile (e.g. a packaging file).
+# Usage: $ bplog "$(<${vendorJSON})
+bplog() {
+  echo -n "${@}" | awk 'BEGIN {printf "msg=\""; f="%s"} {gsub(/"/, "\\\"", $0); printf f, $0} {if (NR == 1) f="\\n%s" } END { print "\"" }' >> "${BUILDPACK_LOG_FILE}"
+}
+
+# Measures time elapsed for a specific build step.
+# Usage: $ let start=$(nowms); mtime "glide.install.time" "${start}"
+# https://github.com/heroku/engineering-docs/blob/master/guides/logs-as-data.md#distributions-measure
+mtime() {
+  local key="${BPLOG_PREFIX}.${1}"
+  local start="${2}"
+  local end="${3:-$(nowms)}"
+  echo "${key} ${start} ${end}" | awk '{ printf "measure#%s=%.3f\n", $1, ($3 - $2)/1000 }' >> "${BUILDPACK_LOG_FILE}"
+}
+
+# Logs a count for a specific built step.
+# Usage: $ mcount "tool.govendor"
+# https://github.com/heroku/engineering-docs/blob/master/guides/logs-as-data.md#counting-count
+mcount() {
+  local k="${BPLOG_PREFIX}.${1}"
+  local v="${2:-1}"
+  echo "count#${k}=${v}" >> "${BUILDPACK_LOG_FILE}"
+}
+
+# Logs a measure for a specific build step.
+# Usage: $ mmeasure "tool.installed_dependencies" 42
+# https://github.com/heroku/engineering-docs/blob/master/guides/logs-as-data.md#distributions-measure
+mmeasure() {
+  local k="${BPLOG_PREFIX}.${1}"
+  local v="${2}"
+  echo "measure#${k}=${v}" >> "${BUILDPACK_LOG_FILE}"
+}
+
+# Logs a unuique measurement build step.
+# Usage: $ munique "versions.count" 2.7.13
+# https://github.com/heroku/engineering-docs/blob/master/guides/logs-as-data.md#uniques-unique
+munique() {
+  local k="${BPLOG_PREFIX}.${1}"
+  local v="${2}"
+  echo "unique#${k}=${v}" >> "${BUILDPACK_LOG_FILE}"
+}
+
+# Measures when an exit path to the buildpack is reached, given a name, then exits 1.
+# Usage: $ mcount-exi "binExists"
+mcount_exit() {
+  mcount "error.${1}"
+  exit 1
+}