################
##### Builder
##### docker buildx create --use --name multi-builder --platform linux/arm64,linux/amd64
# https://github.com/docker/buildx/issues/318#issuecomment-1023226339
#FROM --platform=$BUILDPLATFORM rustlang/rust:nightly-buster-slim as builder
ARG BASE_IMAGE
FROM ${BASE_IMAGE} AS builder

# Installing git because of the workaround for the config
# https://github.com/rust-lang/cargo/issues/10781#issuecomment-1441071052
RUN apt-get update && apt-get install -y git

WORKDIR /usr/src/github.com/rust-lang

# Create blank project
RUN USER=root cargo new mdBook

WORKDIR /usr/src/github.com/rust-lang/mdBook

## Install target platform (Cross-Compilation) --> Needed for Alpine
# Use stable rather than nightly for the build target
# Got errors while building after 6 months
# https://substrate.stackexchange.com/questions/5379/how-do-i-fix-a-failed-build-error-e0635-unknown-feature-proc-macro-span-shri/9312#9312
RUN rustup default stable

# note: the `x86_64-unknown-linux-musl` target may not be installed  
RUN rustup target add x86_64-unknown-linux-musl

# We want dependencies cached, so copy those first.
COPY Cargo.toml Cargo.lock /usr/src/github.com/rust-lang/mdBook
# examples is referenced in Cargo.toml
COPY examples /usr/src/github.com/rust-lang/mdBook/examples

# This is a dummy build to pull dependencies and have them cached
# https://github.com/rust-lang/cargo/issues/8172#issuecomment-659056517
# Very slow builds: https://github.com/rust-lang/cargo/issues/9167#issuecomment-1219251978
# Logs verbose: https://github.com/rust-lang/cargo/issues/1106#issuecomment-141555744
RUN cargo build -vv --config "net.git-fetch-with-cli=true" --target x86_64-unknown-linux-musl --release

WORKDIR /usr/src/github.com/rust-lang/mdBook

# Now copy in the rest of the sources
COPY src /usr/src/github.com/rust-lang/mdBook/src

# This is the actual application build: # ./target/x86_64-unknown-linux-musl/release/mdbook
RUN cargo build --locked --bin mdbook --release --target x86_64-unknown-linux-musl

################
##### Runtime
FROM alpine:3.18.4 AS runtime 

# Copy application binary from builder image
COPY --from=builder /usr/src/github.com/rust-lang/mdBook/target/x86_64-unknown-linux-musl/release/mdbook /usr/local/bin/mdbook

# Just to document which port a container from this image exposes
EXPOSE 3000

# The command to serve the books
ENTRYPOINT ["mdbook", "serve", "--hostname", "0.0.0.0"]