Dockerfile.alpine

# supported versions here: https://hub.docker.com/_/rust
ARG RUST_BUILDER_VERSION=slim-bookworm
ARG ALPINE_VERSION=3.23

########################
## builder image
########################
FROM ghcr.io/rust-cross/rust-musl-cross:x86_64-musl AS builder

RUN apt-get update \
    && apt-get -y install git cmake perl pkg-config libclang-dev \
    && rm -rf /var/lib/apt/lists/*

RUN rustup target add x86_64-unknown-linux-musl

WORKDIR /redlib

# download (most) dependencies in their own layer
COPY Cargo.lock Cargo.toml ./
RUN mkdir src && echo "fn main() { panic!(\"why am i running?\") }" > src/main.rs
RUN cargo build --release --locked --bin redlib --target x86_64-unknown-linux-musl
RUN rm ./src/main.rs && rmdir ./src

# copy the source and build the redlib binary
COPY . ./
RUN cargo build --release --locked --bin redlib --target x86_64-unknown-linux-musl
RUN echo "finished building redlib!"

########################
## release image
########################
FROM alpine:${ALPINE_VERSION} AS release

# Import redlib binary from builder
COPY --from=builder /redlib/target/x86_64-unknown-linux-musl/release/redlib /usr/local/bin/redlib

# Add non-root user for running redlib
RUN adduser --home /nonexistent --no-create-home --disabled-password redlib
USER redlib

# Document that we intend to expose port 8080 to whoever runs the container
EXPOSE 8080

# Run a healthcheck every minute to make sure redlib is functional
HEALTHCHECK --interval=1m --timeout=3s CMD wget --spider -q http://localhost:8080/settings || exit 1

# Add container metadata
LABEL org.opencontainers.image.authors="sigaloid"

CMD ["redlib"]