Add initial working buildpack

Co-authored-by: Eoghan Kelleher <[email protected]>

.gitignore

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+# workspace file
+.idea/
+.vscode/
+
+# OS files
+.DS_Store

README.md

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+# Cloud Foundry OpenSSL Buildpack
+
+A Cloud Foundry [buildpack](http://docs.cloudfoundry.org/buildpacks/) for using OpenSSL 1.1 on cflinuxfs4.
+
+This supply buildpack is meant to be used with the .NET buildpack as the final buildpack. This buildpack sets the
+the `LD_LIBRARY_PATH` and the `CLR_OPENSSL_VERSION_OVERRIDE` environment variables needed by .NET apps to be able
+to use the non-default OpenSSL version. This buildpack may work with other final buildpacks, but is currently
+untested.
+
+### Usage
+
+Just add this buildpack to your app's list of existing buildpacks. For example:
+
+```yaml
+---
+applications:
+  - name: cf-dotnet-webapp
+    buildpacks:
+      - openssl_buildpack
+      - dotnet_core_buildpack
+    memory: 1G
+    stack: cflinuxfs4
+```
+
+### Building the Buildpack
+
+Since this buildpack is nothing more than a bash script, just run the `create_buildpack.sh` script to package and upload the buildpack to CF. This will increment the version, delete the old version of the buildpack from CF, then create a new version of it.
+

VERSION

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+1.0

bin/detect

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+#! /bin/sh
+exit 0

bin/supply

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+#!/bin/bash
+set -euo pipefail
+
+# Variables passed to the supply script
+BUILD_DIR=$1        # Application build directory
+CACHE_DIR=$2        # Buildpack's cache directory
+DEPS_DIR=$3         # Root directory for all buildpack dependencies
+DEPS_IDX=$4         # Index for this buildpack's dependencies
+
+# Calculate the current buildpack's dependency directory
+DEP_DIR="$DEPS_DIR/$DEPS_IDX"
+
+# Get the buildpack's base directory
+BUILDPACK_DIR=$(dirname "$0")/..
+
+# Buildpack banner
+VERSION=$(cat "$BUILDPACK_DIR/VERSION")
+echo "-----> OpenSSL Buildpack version $VERSION"
+echo "-----> Supplying OpenSSL 1.1"
+
+# Create the necessary directories in the dependencies folder
+echo "Creating openssl folder"
+mkdir -p "$DEP_DIR/openssl"
+
+echo "Extracting openssl files"
+tar -xzvf "$BUILDPACK_DIR/dependencies/openssl1.1.1.tar.gz" -C "$DEP_DIR/openssl/"
+
+# Add runtime environment variables to .profile.d/
+mkdir -p "$BUILD_DIR/.profile.d"
+cat <<EOF > "$BUILD_DIR/.profile.d/set_ssl_path.sh"
+#!/bin/bash
+export LD_LIBRARY_PATH="/home/vcap/deps/$DEPS_IDX/openssl/openssl-1.1.1;\$LD_LIBRARY_PATH"
+export CLR_OPENSSL_VERSION_OVERRIDE='1.1'
+EOF
+
+chmod a+x "$BUILD_DIR/.profile.d/set_ssl_path.sh"

create_buildpack.sh

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+#! /usr/bin/env bash
+
+SCRIPT_DIR=$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )
+
+VERSION=$(cat "$SCRIPT_DIR/VERSION")
+IFS='.' read -r MAJOR MINOR <<< "$VERSION"
+MINOR=$((MINOR + 1))
+NEXTVERSION="$MAJOR.$MINOR"
+
+pushd "$SCRIPT_DIR"
+zip -r "/tmp/openssl_buildpack-v$NEXTVERSION.zip" . -x .DS_Store
+popd
+cf delete-buildpack openssl_buildpack -f
+cf create-buildpack openssl_buildpack "/tmp/openssl_buildpack-v$NEXTVERSION.zip" 99
+
+echo "$NEXTVERSION" > "$SCRIPT_DIR/VERSION"

manifest.yml

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+default_versions: []
+dependencies: []
+dependency_deprecation_dates: []
+include_files:
+- README.md
+- VERSION
+- bin/supply
+- bin/detect
+- manifest.yml
+- dependencies/openssl1.1.1.tar.gz
+language: openssl
+stack: cflinuxfs4