From b9974335f3a16a4353839b260b300c1442339329 Mon Sep 17 00:00:00 2001
From: Patric Stout <github@truebrain.nl>
Date: Sat, 23 Jul 2022 11:30:30 +0200
Subject: [PATCH] Add a Dockerfile that supports buildx for amd64/arm64

---
 Dockerfile.buildx | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)
 create mode 100644 Dockerfile.buildx

diff --git a/Dockerfile.buildx b/Dockerfile.buildx
new file mode 100644
index 00000000..830f4a83
--- /dev/null
+++ b/Dockerfile.buildx
@@ -0,0 +1,46 @@
+# build target, used for building the binary, providing shared libraries and could be used as a development env
+FROM debian:bullseye-slim as build
+
+# install build dependencies
+RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get -y install g++ make cmake libssl-dev file
+
+# create flashmq user and group for runtime image below
+RUN useradd --system --shell /bin/false --user-group --no-log-init flashmq
+
+WORKDIR /usr/src/app
+COPY . .
+RUN ./build.sh
+
+# convert docker buildx platform name to Debian platform name
+FROM scratch AS run-amd64
+ARG PLATFORM=x86_64
+ARG LD_LOCATION=/lib64/ld-linux-x86-64.so.2
+
+FROM scratch AS run-arm64
+ARG PLATFORM=aarch64
+ARG LD_LOCATION=/lib/ld-linux-aarch64.so.1
+
+# from scratch image is empty
+FROM run-$TARGETARCH AS run
+
+# set the user/group to flashmq and copy the passwd/group files from build to make that work
+USER flashmq:flashmq
+COPY --from=build /etc/passwd /etc/passwd
+COPY --from=build /etc/group /etc/group
+
+# copy in the shared libaries in use discovered using ldd on release binary
+COPY --from=build /lib/${PLATFORM}-linux-gnu/libpthread.so.0 /lib/${PLATFORM}-linux-gnu/libpthread.so.0
+COPY --from=build /lib/${PLATFORM}-linux-gnu/libdl.so.2 /lib/${PLATFORM}-linux-gnu/libdl.so.2
+COPY --from=build /usr/lib/${PLATFORM}-linux-gnu/libssl.so.1.1 /usr/lib/${PLATFORM}-linux-gnu/libssl.so.1.1
+COPY --from=build /usr/lib/${PLATFORM}-linux-gnu/libcrypto.so.1.1 /usr/lib/${PLATFORM}-linux-gnu/libcrypto.so.1.1
+COPY --from=build /usr/lib/${PLATFORM}-linux-gnu/libstdc++.so.6 /usr/lib/${PLATFORM}-linux-gnu/libstdc++.so.6
+COPY --from=build /lib/${PLATFORM}-linux-gnu/libgcc_s.so.1 /lib/${PLATFORM}-linux-gnu/libgcc_s.so.1
+COPY --from=build /lib/${PLATFORM}-linux-gnu/libc.so.6 /lib/${PLATFORM}-linux-gnu/libc.so.6
+COPY --from=build ${LD_LOCATION} ${LD_LOCATION}
+COPY --from=build /lib/${PLATFORM}-linux-gnu/libm.so.6 /lib/${PLATFORM}-linux-gnu/libm.so.6
+
+# copy in the FlashMQ binary itself
+COPY --from=build /usr/src/app/FlashMQBuildRelease/FlashMQ /bin/FlashMQ
+
+EXPOSE 1883
+CMD ["/bin/FlashMQ"]