# Initially I wanted to build a slim image using this Dockerfile and static linking.
# It would use something like this in Cargo.toml:
#
# [build-dependencies.clang]
# version = "2.0.0"
# default-features = false
# features = ["static"]
#
# [build-dependencies.clang-sys]
# version = "1.7.0"
# default-features = false
# features = ["clang_16_0", "static"]
#
# But there are a lot of problems with static linking and clang & clang-sys crates:
# - https://github.com/KyleMayes/clang-sys/issues/174
# - https://github.com/KyleMayes/clang-rs/issues/17
# - https://github.com/KyleMayes/clang-sys/issues/148 (this is the one I *like* the most!)
#
# So, no static linking for now, but I don't wanna erase all this gorgeous Dockerfile code, so... I'll let it linger
# in the repo for now.

# Stage 1: Build the Rust application
FROM rust:1.78-alpine AS builder

# Set the working directory
WORKDIR /usr/src/

# Install necessary packages
RUN apk add --no-cache \
    ffmpeg-libs \
    ffmpeg-dev \
    pkgconf \
    musl-dev \
    clang16-static \
    llvm-dev \
    zlib-dev \
    libffi-dev \
    ncurses-dev \
    gcc \
    g++ \
    git \
    build-base

# Add target for musl
RUN rustup target add x86_64-unknown-linux-musl

# Create a new Rust project
RUN USER=root cargo new atranscoder-rpc
WORKDIR /usr/src/atranscoder-rpc

# Copy the manifest and lock files
COPY Cargo.toml Cargo.lock ./

# Set the environment variable for libclang path
ENV LIBCLANG_PATH=/usr/lib/llvm16/lib
ENV PKG_CONFIG_PATH=/usr/lib/pkgconfig

# Build dependencies to cache them
RUN cargo build --release --target x86_64-unknown-linux-musl

# Copy the source code
COPY src ./src

# Build the project and install the binary
RUN cargo install --target x86_64-unknown-linux-musl --path . && \
    mkdir -p /result/{tmp,bin} && \
    mv /usr/local/cargo/bin/atranscoder-rpc /result/bin

# Stage 2: Create the final minimal image
FROM scratch
COPY --from=builder /usr/bin/dumb-init /bin/
COPY --from=builder /result/bin /bin
COPY --from=builder /result/tmp /tmp
EXPOSE 8090
ENTRYPOINT ["/bin/dumb-init", "--", "/bin/atranscoder-rpc"]