Dockerfile

# From https://raw.githubusercontent.com/LemmyNet/lemmy/main/docker/Dockerfile

FROM rust:1.70-slim-buster as builder
WORKDIR /app
# ARG CARGO_BUILD_TARGET=x86_64-unknown-linux-musl
ARG CARGO_BUILD_TARGET=aarch64-unknown-linux-gnu

# comma-seperated list of features to enable
ARG CARGO_BUILD_FEATURES=default

# This can be set to release using --build-arg
ARG RUST_RELEASE_MODE="debug"

# Install compilation dependencies
RUN apt-get update \
  && apt-get -y install --no-install-recommends libssl-dev pkg-config libpq-dev git \
  && rm -rf /var/lib/apt/lists/*

# Install the target for whatever architecture we are building this on
# (NOT sure if I need this honestly!)
RUN rustup target add ${CARGO_BUILD_TARGET}

COPY . .

# Build the project
    
# Debug mode build
RUN --mount=type=cache,target=/app/target \
  if [ "$RUST_RELEASE_MODE" = "debug" ] ; then \
    echo "pub const VERSION: &str = \"$(git describe --tag)\";" > "crates/utils/src/version.rs" \
    && cargo build --target ${CARGO_BUILD_TARGET} --features ${CARGO_BUILD_FEATURES} \
    && cp ./target/$CARGO_BUILD_TARGET/$RUST_RELEASE_MODE/lemmy_server /app/lemmy_server; \
  fi

# Release mode build
RUN \
  if [ "$RUST_RELEASE_MODE" = "release" ] ; then \
    echo "pub const VERSION: &str = \"$(git describe --tag)\";" > "crates/utils/src/version.rs" \
    && cargo build --target ${CARGO_BUILD_TARGET} --features ${CARGO_BUILD_FEATURES} --release \
    && cp ./target/$CARGO_BUILD_TARGET/$RUST_RELEASE_MODE/lemmy_server /app/lemmy_server; \
  fi

# The Debian runner
FROM debian:buster-slim as lemmy

# Install libpq for postgres
RUN apt-get update \
  && apt-get -y install --no-install-recommends postgresql-client libc6 libssl1.1 ca-certificates \
  && rm -rf /var/lib/apt/lists/*

RUN addgroup --gid 1000 lemmy
RUN useradd --no-create-home --shell /bin/sh --uid 1000 --gid 1000 lemmy

# Copy resources
COPY --chown=lemmy:lemmy --from=builder /app/lemmy_server /app/lemmy

RUN chown lemmy:lemmy /app/lemmy
USER lemmy

EXPOSE 8536

CMD ["/app/lemmy"]