# 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

# rust:1.48-slim-buster
FROM rust@sha256:cb6b98346ef41a2062d4d8f099127d880f2ef7c1515d00215fc9ea713b99167b 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

# 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@sha256:240f770008bdc538fecc8d3fa7a32a533eac55c14cbc56a9a8a6f7d741b47e33

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

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

USER nonroot
WORKDIR /home/nonroot

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

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

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