# https://whitfin.io/speeding-up-rust-docker-builds/
# TODO: https://stackoverflow.com/questions/57389547/how-to-define-the-context-for-a-docker-build-as-a-specific-commit-on-one-of-the

# 1.47 slim-buster
FROM rust@sha256:2a902de987345f126fe59daca200afae1fccb6f68e14e9a27c0fd9cf39f9743f as build

#RUN apk add libseccomp-dev

WORKDIR /
ENV USER root

# create empty shell projects
RUN cargo new --bin ptth

WORKDIR /ptth

RUN \
cargo new --lib crates/always_equal && \
cargo new --lib crates/ptth_core && \
cargo new --bin crates/ptth_file_server_bin && \
cargo new --bin crates/ptth_relay && \
cargo new --bin crates/ptth_server

# copy over your manifests
COPY ./Cargo.lock                     ./
COPY ./Cargo.toml                     ./
COPY ./crates/always_equal/Cargo.toml ./crates/always_equal/
COPY ./crates/ptth_core/Cargo.toml    ./crates/ptth_core/
COPY ./crates/ptth_relay/Cargo.toml   ./crates/ptth_relay/
COPY ./crates/ptth_file_server_bin/Cargo.toml   ./crates/ptth_file_server_bin/
COPY ./crates/ptth_server/Cargo.toml   ./crates/ptth_server/

# this build step will cache your dependencies
RUN cargo build --release -p ptth_relay

RUN \
rm \
src/*.rs \
crates/always_equal/src/*.rs \
crates/ptth_core/src/*.rs \
crates/ptth_file_server_bin/src/*.rs \
crates/ptth_relay/src/*.rs \
crates/ptth_server/src/*.rs

# Copy source tree
# Yes, I tried a few variations on the syntax. Dockerfiles are just rough.

COPY ./src/ ./src
COPY ./crates/ ./crates
COPY ./handlebars/ ./handlebars

# Bug in cargo's incremental build logic, triggered by
# Docker doing something funny with mtimes? Maybe?
RUN touch crates/ptth_core/src/lib.rs

ARG git_version
RUN echo -n "$git_version" > crates/ptth_relay/src/git_version.txt

# build for release
# gate only on ptth_relay tests for now
RUN \
cargo build --release -p ptth_relay && \
cargo test --release -p ptth_relay

# buster-slim
FROM debian@sha256:062bbd9a1a58c9c5b8fc9d83a206371127ef268cfcc65f1a01227c6faebdb212

RUN apt-get update \
&& apt-get install -y libssl1.1 ca-certificates \
&& apt-get upgrade -y

COPY --from=build /ptth/target/release/ptth_relay             /root/
COPY --from=build /ptth/crates/ptth_relay/src/git_version.txt /root/
COPY --from=build /ptth/handlebars                            /root/handlebars

WORKDIR /root
ENTRYPOINT ["./ptth_relay"]