Merge pull request #769 from heroku/pip-pipenv-pin

Pin pip version used by pipenv

CHANGELOG.md

@@ -1,6 +1,16 @@
 # Python Buildpack Changelog
 
-# 139
+# 141 (2018-10-10)
+
+Switch to cautious upgrade for Pipenv install to ensure the pinned pip version
+is used with Pipenv
+
+# 140 (2018-10-09)
+
+Add support for detecting SLUGIFY_USES_TEXT_UNIDECODE, which is required to
+install Apache Airflow version 1.10 or higher.
+
+# 139 (2018-10-08)
 
 Improvements to Python install messaging
 

bin/steps/pip-install

@@ -8,10 +8,24 @@ if [ ! "$SKIP_PIP_INSTALL" ]; then
     # Install dependencies with Pip.
     puts-step "Installing requirements with pip"
 
-    # Set PIP_EXTRA_INDEX_URL
+    # Set Pip env vars
-    if [[ -r $ENV_DIR/PIP_EXTRA_INDEX_URL ]]; then
+    # This reads certain environment variables set on the Heroku app config
+    # and makes them accessible to the pip install process.
+    #
+    # PIP_EXTRA_INDEX_URL allows for an alternate pypi URL to be used.
+    if [[ -r "$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
+
+    # 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

bin/steps/pipenv

@@ -20,7 +20,6 @@ if [[ -f Pipfile.lock ]]; then
                 export SKIP_PIPENV_INSTALL=1
                 export SKIP_PIP_INSTALL=1
             fi
-
         fi
     fi
 fi
@@ -35,16 +34,31 @@ if [ ! "$SKIP_PIPENV_INSTALL" ]; then
         # Skip pip install, later.
         export SKIP_PIP_INSTALL=1
 
-        # Set PIP_EXTRA_INDEX_URL
+        # Set Pip env vars
-        if [[ -r $ENV_DIR/PIP_EXTRA_INDEX_URL ]]; then
+        # This reads certain environment variables set on the Heroku app config
+        # and makes them accessible to the pip install process.
+        #
+        # PIP_EXTRA_INDEX_URL allows for an alternate pypi URL to be used.
+        if [[ -r "$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 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.
-        /app/.heroku/python/bin/pip install pipenv==$PIPENV_VERSION --upgrade &> /dev/null
+        # Due to weird old pip behavior and pipenv behavior, pipenv upgrades pip
+        # to latest if only --upgrade is specified. Specify upgrade strategy to
+        # avoid this eager behavior.
+        /app/.heroku/python/bin/pip install pipenv==$PIPENV_VERSION --upgrade --upgrade-strategy only-if-needed &> /dev/null
 
         # Install the dependencies.
         if [[ ! -f Pipfile.lock ]]; then

test/fixtures/airflow/requirements.txt

@@ -0,0 +1 @@
+apache-airflow==1.10

test/run

@@ -1,5 +1,12 @@
 #!/usr/bin/env bash
 
+testAirflow() {
+  export SLUGIFY_USES_TEXT_UNIDECODE="yes"
+  compile "airflow"
+  assertCaptured "apache-airflow==1.10"
+  assertCapturedSuccess
+}
+
 testPipenv() {
   compile "pipenv"
   assertCapturedSuccess