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builder: build sccache local-only with cargo-auditable, drop cargo registry #4

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Merged
patrick-main-promotion-bot merged 1 commit into from
Oct 3, 2026
Merged

builder: build sccache local-only with cargo-auditable, drop cargo registry #4

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18 changes: 16 additions & 2 deletions environments/alpine-3.24-musl/Containerfile
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Original file line number Diff line number Diff line change
Expand Up @@ -11,7 +11,8 @@
# - base image: by multi-arch index digest
# - rustup-init: exact version, sha256 checked per architecture
# - rustc: exact version
# - sccache: exact version, --locked
# - sccache: exact version, --locked, --no-default-features (local disk cache only),
# built with cargo-auditable (exact version, --locked) so scanners read the binary
# - maturin: exact version, --require-hashes from requirements-builder.txt
# - apk packages: NOT hash-pinnable; the CI workflow diffs the installed
# list against the committed apk.lock.<arch> and fails on any change.
Expand Down Expand Up @@ -77,7 +78,20 @@ RUN set -eu; \

# sccache: exact version. Cache lives on a bind-mounted host dir at run time.
ARG SCCACHE_VERSION=0.18.0
RUN cargo install sccache --version "${SCCACHE_VERSION}" --locked
ARG CARGO_AUDITABLE_VERSION=0.7.7
# Local disk cache only: the default feature set pulls in S3/Redis/GCS/etc. and a full
# network stack that this builder never uses. cargo-auditable embeds the dependency list
# in the binary so Syft/Trivy scan what was actually compiled. The tool, the crate
# sources and the registry are removed in the same layer. The guard fails the build if
# the network stack is back.
RUN set -eux; \
cargo install cargo-auditable --version "${CARGO_AUDITABLE_VERSION}" --locked --root /tmp/auditable; \
PATH="/tmp/auditable/bin:${PATH}" \
cargo auditable install sccache --version "${SCCACHE_VERSION}" --locked --no-default-features; \
rm -rf /tmp/auditable /opt/cargo/registry /opt/cargo/git; \
sccache --version | grep -F "${SCCACHE_VERSION}"; \
if grep -q -a -e opendal -e reqwest /opt/cargo/bin/sccache; then \
echo "sccache contains network backend code" >&2; exit 1; fi
ENV RUSTC_WRAPPER=/opt/cargo/bin/sccache \
SCCACHE_DIR=/sccache \
CARGO_TARGET_DIR=/cargo-target
Expand Down
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