feat: smaller docker image (#16)

* multistage docker build + cargo chef

* fix(docker): drop unused sh binary

* docker: add labels and better comments

* fix(docker): drop unneeded PATH

* docs(readme): update missing rdfpipe features

* change docker user name

* explicitely allow COPY targets with .dockerignore

.dockerignore

@@ -0,0 +1,4 @@
+*
+!src/
+!Cargo.toml
+!Cargo.lock

Dockerfile

@@ -1,19 +1,74 @@
-ARG BASE_IMAGE=ekidd/rust-musl-builder:latest
+# This Dockerfile uses a multi-stage build with
+# cargo-chef to cache compiled dependencies and
+# minimize the size of the final image.
 
-# Build environment
-FROM ${BASE_IMAGE} AS builder
+ARG RUST_BASE=rust:1.74.0-slim-bookworm
+ARG RUNNER_BASE=gcr.io/distroless/cc-debian12
+ARG VERSION_BUILD=0.1.0
 
-# Add source code under new user
-ADD --chown=rust:rust . ./
+### 1: Read code and write recipe file
+FROM ${RUST_BASE} AS planner
+WORKDIR /app
+RUN cargo install cargo-chef
+COPY . .
+RUN cargo chef prepare --recipe-path recipe.json
+
+### 2: Cache compiled dependencies for faster builds
+FROM ${RUST_BASE} AS cacher
+WORKDIR /app
+RUN cargo install cargo-chef
+COPY --from=planner /app/recipe.json recipe.json
+RUN cargo chef cook --release --recipe-path recipe.json
+
+
+### 3: Build project, but reuse cached dependencies
+FROM ${RUST_BASE} AS builder
+
+# Create unprivileged user
+ENV USER=appuser
+ENV UID=1001
+
+RUN adduser \
+    --disabled-password \
+    --gecos "" \
+    --home "/nonexistent" \
+    --shell "/sbin/nologin" \
+    --no-create-home \
+    --uid "${UID}" \
+    "${USER}"
+
+COPY . /app
+WORKDIR /app
+
+# Copy pre-built dependencies
+COPY --from=cacher /app/target target
+COPY --from=cacher /usr/local/cargo /usr/local/cargo
 
 RUN cargo build --release
 
-# Runner image
-FROM alpine:latest
-RUN apk --no-cache add ca-certificates
+
+### 4: Copy required binaries into distroless runner
+FROM ${RUNNER_BASE} AS runner
+
+# Add annotations
+LABEL org.opencontainers.image.source=https://github.com/SDSC-ORD/rdfpipe-rs
+LABEL org.opencontainers.image.description="Quickly convert between RDF file formats. A rust implementation of rdfpipe based on the sophia crate."
+LABEL org.opencontainers.image.licenses=GPL-3.0-or-later
+LABEL org.opencontainers.image.version ${VERSION_BUILD}
+
+WORKDIR /app
+
+# Import user files
+COPY --from=builder /etc/passwd /etc/passwd
+COPY --from=builder /etc/group /etc/group
+
+# Import binary
 COPY --from=builder \
-    /home/rust/src/target/x86_64-unknown-linux-musl/release/rdfpipe-rs \
-    /usr/local/bin/
+    /app/target/release/rdfpipe-rs \
+    /app/rdfpipe-rs
+
+# Use unprivileged user
+USER appuser:appuser
 
-CMD /usr/local/rdfpipe-rs
+ENTRYPOINT ["./rdfpipe-rs"]
 

README.md

@@ -11,7 +11,6 @@ rdfpipe-rs is still missing the following features:
 
 * json-ld support
 * quad support (named graphs)
-* serializing prettified turtle.
 * `--ns` option for explicit namespace binding