Script that packages the app in a virtualenv

build.sh

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+#!/bin/bash
+#
+# Basic packaging script that rolls the app and its deps
+# into a standalone pex
+
+
+# Clean any stale state
+rm -rf build
+
+# Create and push the build dir
+mkdir build build/egg build/pex
+pushd build
+
+# Create and activate a virtualenv for chroot-ish packaging
+virtualenv venv
+source venv/bin/activate
+
+# Install pex and its dependencies then package up the app
+pip install pex
+pex .. -v \
+  --output-file=discovery.pex \
+  --requirement=$(realpath ../requirements.txt) \
+  --disable-cache \
+  --pex-root=pex \
+  -e app:app.run
+
+# Deactivate the virtualenv
+deactivate
+
+# Pop back to the top-level dir
+popd