lemmy/docker/Dockerfile

# FIXME: use "--platform=$BUILDPLATFORM" and solve openssl cross-compile issue
FROM rust:1.67.0-alpine as builder

# Install build dependencies
RUN apk add --no-cache git openssl-dev libpq-dev musl-dev

# Set the working directory to /app and copy the source code
WORKDIR /app
COPY . .

# Set the target architecture (can be set using --build-arg), buildx set it automatically
ARG TARGETARCH

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

# Prepare toolchain
# Docker and Rust use different architecture naming schemas, so we have to convert them
RUN case $TARGETARCH in \
      arm64) RUSTARCH=aarch64 ;; \
      amd64) RUSTARCH=x86_64 ;; \
      *) echo "unsupported architecture: $TARGETARCH"; exit 3 ;; \
    esac \
 && echo "RUSTARCH=$RUSTARCH" >> .buildenv

# Debug mode build
RUN --mount=type=cache,target=/app/target \
    if [ "$RUST_RELEASE_MODE" = "debug" ]; then \
      source .buildenv \
      && echo "pub const VERSION: &str = \"$(git describe --tag)\";" > "crates/utils/src/version.rs" \
      && rustup target add ${RUSTARCH}-unknown-linux-musl \
      && cargo build --target ${RUSTARCH}-unknown-linux-musl \
      && cp ./target/${RUSTARCH}-unknown-linux-musl/${RUST_RELEASE_MODE}/lemmy_server /app/lemmy_server; \
    fi

# Release mode build
RUN \
    if [ "$RUST_RELEASE_MODE" = "release" ]; then \
      source .buildenv \
      && rustup target add ${RUSTARCH}-unknown-linux-musl \
      && cargo build --target ${RUSTARCH}-unknown-linux-musl --release \
      && cp ./target/${RUSTARCH}-unknown-linux-musl/${RUST_RELEASE_MODE}/lemmy_server /app/lemmy_server; \
    fi

# The Alpine runner
FROM alpine:3 as lemmy

# Install libpq for Postgres
RUN apk add --no-cache ca-certificates libpq

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

EXPOSE 8536
CMD ["/app/lemmy"]