Add a make target to build a static bin

Signed-off-by: Albin Kerouanton <albinker@gmail.com>

Author: akerouanton

.dockerignore

@@ -0,0 +1,5 @@
+*
+
+!go.mod
+!go.sum
+!*.go

Dockerfile

@@ -0,0 +1,27 @@
+FROM golang:1.20-bookworm AS build
+
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends bison flex && \
+    rm -r /var/lib/apt/*
+
+WORKDIR /build
+
+ENV LIBPCAP_VERSION=1.10.4
+RUN wget http://www.tcpdump.org/release/libpcap-${LIBPCAP_VERSION}.tar.gz && \
+    tar xvf libpcap-${LIBPCAP_VERSION}.tar.gz && \
+    cd libpcap-${LIBPCAP_VERSION} && \
+    ./configure && \
+    make
+
+COPY . /build
+
+ENV LD_LIBRARY_PATH="-L/build/libpcap-${LIBPCAP_VERSION}" \
+    CGO_LDFLAGS="-L/build/libpcap-${LIBPCAP_VERSION}" \
+    CGO_CPPFLAGS="-I/build/libpcap-${LIBPCAP_VERSION}"
+RUN GOOS=linux GOARCH=amd64 go build -ldflags "-linkmode 'external' -extldflags '-static' -s -w" -o bin/iptables-tracer .
+
+####################
+
+FROM scratch AS binary
+WORKDIR /bin
+COPY --from=build /build/bin/iptables-tracer /bin/

Makefile

@@ -1,7 +1,15 @@
-.PHONY: build
-build:
+IMAGE_TAG = akerouanton/iptables-tracer:latest
+BUILD_OPTS =
+
+ifdef BUILDER
+BUILD_OPTS := --builder=${BUILDER}
+endif
+
+.PHONY: binary
+binary:
 	if [ ! -d bin/ ]; then mkdir bin; fi
-	go build -o bin/iptables-tracer ./
+	docker build ${BUILD_OPTS} -t ${IMAGE_TAG} --target=binary .
+	undock --include=/bin docker-daemon://${IMAGE_TAG} .
 
 install:
 	sudo cp bin/iptables-tracer /usr/local/sbin/iptables-tracer