Dockerfile

FROM docker.io/golang:1.23-bookworm as builder

ARG VER=devel
ARG BUILDTAGS=""
ARG EXTERNAL="0"

ENV CGO_ENABLED=0

RUN mkdir -p /sshpiperd/plugins
WORKDIR /src
RUN --mount=target=/src,type=bind,source=. --mount=type=cache,target=/root/.cache/go-build if [ "$EXTERNAL" = "1" ]; then cp sshpiperd /sshpiperd; else go build -o /sshpiperd -ldflags "-X main.mainver=$VER" ./cmd/... ; fi
RUN --mount=target=/src,type=bind,source=. --mount=type=cache,target=/root/.cache/go-build if [ "$EXTERNAL" = "1" ]; then cp -r plugins /sshpiperd ; else go build -o /sshpiperd/plugins -tags "$BUILDTAGS" ./plugin/... ./e2e/testplugin/...; fi
ADD entrypoint.sh /sshpiperd

FROM builder as testrunner
RUN apt update && apt install -y autoconf automake libssl-dev libz-dev

RUN cd /tmp && \
    curl -fsSL https://github.com/openssh/openssh-portable/archive/refs/tags/V_9_8_P1.tar.gz | tar xz && \
    cd openssh-portable-V_9_8_P1 && \
    autoreconf && \
    ./configure && \
    make ssh && \
    cp ssh /usr/bin/ssh-9.8.1p1

FROM docker.io/busybox
# LABEL maintainer="Boshi Lian<farmer1992@gmail.com>"

RUN mkdir /etc/ssh/

# Add user nobody with id 1
ARG USERID=1000
ARG GROUPID=1000
RUN addgroup -g $GROUPID -S sshpiperd && adduser -u $USERID -S sshpiperd -G sshpiperd

# Add execution rwx to user 1
RUN chown -R $USERID:$GROUPID /etc/ssh/

USER $USERID:$GROUPID

COPY --from=builder --chown=$USERID /sshpiperd/ /sshpiperd
EXPOSE 2222

ENTRYPOINT ["/sshpiperd/entrypoint.sh"]