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Image builds keep compiled crates between builds (#438)

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The ipx Dockerfile built its dependencies in a layer of stub crates,
which any change to Cargo.toml or Cargo.lock invalidated: all of them
compiled again in release, 405 crates, 170 s at the builder's cap. The
directory's had no such layer and compiled everything every time. Both
now build with cargo's registry and target/ as BuildKit cache mounts.
Measured on Tower: a Cargo.toml change rebuilds three crates in 52 s
instead of 405 in 170 s. The peak is about the same, since the ipx
crate itself is most of it; what goes is the minutes at the cap.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Ray Slakinski
2026-11-09 14:05:12 +00:00
parent f9e4c1d800
commit 3a3900e959
3 changed files with 24 additions and 21 deletions
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12
Dockerfile.directory
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@@ -6,18 +6,22 @@ RUN apt-get update && apt-get install -y --no-install-recommends build-essential
&& rm -rf /var/lib/apt/lists/*
WORKDIR /src
# Every member of the workspace, since cargo reads them all to build one.
# ponytail: no dependency layer, so each build compiles sea-orm again; add the stub trick from
# the main Dockerfile if builds get slow enough to matter.
COPY Cargo.toml Cargo.lock ./
COPY crates ./crates
# The logo and icon the public pages serve (#215), compiled into the binary.
COPY web/logo.svg web/logo-dark.svg web/favicon.png ./web/
RUN cargo build --release --locked -p ipx-directory
# Compiled crates kept in the builder between builds, as in the main Dockerfile (#438). A target
# of its own: built with ipx's, the two would rebuild shared crates for each other's features.
RUN --mount=type=cache,id=ipx-cargo-registry,target=/usr/local/cargo/registry,sharing=locked \
--mount=type=cache,id=ipx-directory-target,target=/src/target,sharing=locked \
touch crates/directory/src/main.rs crates/directory/src/lib.rs crates/feed/src/lib.rs \
&& cargo build --release --locked -p ipx-directory \
&& cp target/release/ipx-directory /usr/local/bin/ipx-directory
FROM debian:trixie-slim
RUN apt-get update && apt-get install -y --no-install-recommends ca-certificates \
&& rm -rf /var/lib/apt/lists/*
COPY --from=build /src/target/release/ipx-directory /usr/local/bin/ipx-directory
COPY --from=build /usr/local/bin/ipx-directory /usr/local/bin/ipx-directory
ENV DIRECTORY_CONFIG=/config/directory.toml
# Unraid's nobody:users. It writes nothing to disk: the database is elsewhere.
USER 99:100