From ba4e0a93ed05ba84541f2e3fe2c233953cbf785a Mon Sep 17 00:00:00 2001
From: Scott Wallace <scott@wallace.sh>
Date: Tue, 29 Mar 2022 10:14:59 +0100
Subject: [PATCH] Multi-arch Docker image buildkit

---
 Dockerfile           | 30 ++++++++++++++++++++++++++++++
 docker-entrypoint.sh |  4 ++++
 2 files changed, 34 insertions(+)
 create mode 100644 Dockerfile
 create mode 100644 docker-entrypoint.sh

diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..0e3539b
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,30 @@
+FROM alpine:3.14 as intermediate
+
+RUN mkdir /src
+WORKDIR /src
+
+# Install the build tools
+RUN apk add git go make
+
+# Fetch the source
+RUN git clone https://github.com/slackhq/nebula.git
+
+# Compile the Linux binaries for all platforms
+WORKDIR /src/nebula
+RUN echo 'bin-linux: $(ALL_LINUX:%=build/%/nebula) $(ALL_LINUX:%=build/%/nebula-cert)' >> Makefile
+RUN make bin-linux
+
+# Start from a clean image
+FROM alpine:3.14
+
+RUN mkdir /app
+WORKDIR /app
+
+# Copy over the compiled binaries
+COPY --from=intermediate /src/nebula/build ./
+
+# Rename the directories from `go env` format to `uname` format
+RUN mv linux-amd64 linux-x86_64
+
+COPY docker-entrypoint.sh entrypoint.sh
+ENTRYPOINT [ "/bin/sh", "/app/entrypoint.sh" ]
diff --git a/docker-entrypoint.sh b/docker-entrypoint.sh
new file mode 100644
index 0000000..8a61f1a
--- /dev/null
+++ b/docker-entrypoint.sh
@@ -0,0 +1,4 @@
+#!/bin/sh
+
+# Run the platform-specific binary
+"/app/linux-$(uname -m)/nebula"