FROM ubuntu:22.04 AS libbpf

RUN apt-get update && apt-get install -y libelf-dev libpcap-dev libbfd-dev binutils-dev build-essential make

RUN apt-get install -y linux-tools-common git curl

RUN mkdir /home/k8spacket/

WORKDIR /home/k8spacket

# install bpftool from the source cases by error `bpftool not found for kernel v...`

# https://github.com/lizrice/lb-from-scratch/issues/1#issuecomment-1537098872

RUN rm -f /usr/sbin/bpftool \

&& git clone --recurse-submodules https://github.com/libbpf/bpftool.git \

&& cd ./bpftool/src \

&& make install \

&& cd ../..

COPY ./libbpf.sh .

RUN ./libbpf.sh

FROM golang:1.23.0 AS build

RUN export DEBIAN_FRONTEND=noninteractive && apt-get update && apt-get install -y clang llvm

RUN mkdir /home/k8spacket/

COPY ./broker /home/k8spacket/broker

COPY ./ebpf /home/k8spacket/ebpf

COPY ./external /home/k8spacket/external

COPY ./modules /home/k8spacket/modules

COPY ./go.mod /home/k8spacket/

COPY ./go.sum /home/k8spacket/

COPY *.go /home/k8spacket/

#`-ldflags "-w -s"` means strip the debugging information to make binary smaller

COPY --from=libbpf ./home/k8spacket/*.h /home/k8spacket/ebpf/inet/bpf

RUN cd /home/k8spacket/ebpf/inet && go generate -ldflags "-w -s"

COPY --from=libbpf ./home/k8spacket/*.h /home/k8spacket/ebpf/tc/bpf

RUN cd /home/k8spacket/ebpf/tc && go generate -ldflags "-w -s"

RUN cd /home/k8spacket && go build .

FROM alpine:3.20.2 as final

RUN apk add --no-cache iproute2 libc6-compat

RUN mkdir /home/k8spacket && cd /home/k8spacket

WORKDIR /home/k8spacket

COPY --from=build ./home/k8spacket/k8spacket /home/k8spacket/

COPY ./fields.json /home/k8spacket/

#COPY ./GeoLite2-City.mmdb /home/k8spacket/

# need to run as root regarding the use of kernel tracing info `/sys/kernel/tracing`

CMD ["./k8spacket"]