# 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

# docker pull rust:1.66-slim-buster
FROM rust@sha256:98c9b1fca0c9a6183369daf9efadb57c634340ae877bb027aeadf72afdd086a3 as build

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_relay && \
cargo new --bin crates/ptth_server && \
cargo new --bin crates/ptth_file_server_bin && \
cargo new --bin tools/ptth_tail && \
cargo new --bin crates/debug_proxy && \
cargo new --bin crates/ptth_quic

# 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_quic/Cargo.toml              ./crates/ptth_quic/

# 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_relay/src/*.rs \
crates/ptth_quic/src/*.rs

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

COPY ./src/                ./src
COPY ./crates/always_equal ./crates/always_equal
COPY ./crates/ptth_core    ./crates/ptth_core
COPY ./crates/ptth_relay   ./crates/ptth_relay
COPY ./handlebars/         ./handlebars
COPY ./crates/ptth_quic    ./crates/ptth_quic

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

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

# debian:buster-slim
FROM debian@sha256:13f0764262a064b2dd9f8a828bbaab29bdb1a1a0ac6adc8610a0a5f37e514955

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

RUN addgroup --gid 10001 ptth_user && adduser --system --uid 10000 --gid 10001 ptth_user

USER ptth_user
WORKDIR /home/ptth_user

COPY --from=build /ptth/target/release/ptth_relay ./
COPY --from=build /ptth/handlebars/relay          ./handlebars/relay

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

CMD ["/usr/bin/tini", "--", "./ptth_relay"]