Test the build using a custom heroku buildpack on your own machine.

deploy-test.sh

#!/bin/sh

if [ -z $1 ]; then
	echo "Usage: $0 project-location"
	exit 1
fi

if [ ! -d $1 ]; then
	echo "Could not find your project"
	exit 2
fi

if [ -z $BUILDPACK_URL ]; then
	echo "No buildpack specified, can only test custom buildpacks"
	exit 3;
fi

# Setup directories
PROJECT="$1"
BASE=`mktemp`
PROJECT_TMP="$BASE/project"
BUILDPACK_TMP="$BASE/buildpack"
if [ -z "$CACHE_TMP" ]; then
	CACHE_TMP="$BASE/cache"
fi

# Remove the temporary file, as we want a directory
rm -R "$BASE"

# Get buildpack
mkdir -p "$BUILDPACK_TMP"
git clone "${BUILDPACK_URL}" "$BUILDPACK_TMP"

# Create a copy of the project
cp -R "$PROJECT" "$PROJECT_TMP"

# Remove repository information
rm -Rf "$PROJECT_TMP/.git"

# Execute detection
APP=$(${BUILDPACK_TMP}/bin/detect "$PROJECT_TMP")
if [ $? -gt 0 ]; then
	echo "No app detected"
	exit 4
fi

echo "Detected $APP application"

# Execute buildpack
${BUILDPACK_TMP}/bin/compile "$PROJECT_TMP" "$CACHE_TMP"

# Create an archive of the result
tar -caf "build-$(date +%d-%m-%y_%H-%M).tar.gz" -C "$BASE" "$(basename $PROJECT_TMP)"

rm -Rf "$BASE"