Miles Ward
a171331a7a
Commit Cargo.lock, copy it into the Docker build stage, and align the Docker Rust base/MSRV with the toolchain required by the locked dependency graph.
103 lines
4.8 KiB
Docker
103 lines
4.8 KiB
Docker
# syntax=docker/dockerfile:1.7
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#
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# OpenPXE — multi-stage build.
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#
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# Design:
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# - stage `fetch`: runs scripts/fetch-ipxe.sh to pull official iPXE binaries
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# into assets/ipxe/ so the rust build can embed them via rust-embed.
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# - stage `build`: compiles the workspace with cargo in release mode.
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# - stage `runtime`: Debian slim image with setcap for NET_BIND_SERVICE,
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# running as a non-root UID. No shell in PATH for the service user;
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# attacker surface is just the openpxe binary + libc.
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#
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# Why not distroless? We want setcap support and easy debug (`oc rsh`).
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# Debian slim at ~75 MB + binary ~25 MB is fine for a PXE server that
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# spends most of its life idle.
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ARG RUST_VERSION=1.95
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########## fetch iPXE binaries ##########
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FROM debian:12-slim AS fetch
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RUN apt-get update && apt-get install -y --no-install-recommends curl ca-certificates \
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&& rm -rf /var/lib/apt/lists/*
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WORKDIR /src
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COPY scripts/fetch-ipxe.sh scripts/fetch-ipxe.sh
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RUN mkdir -p assets/ipxe && bash scripts/fetch-ipxe.sh
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########## build openpxe ##########
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FROM rust:${RUST_VERSION}-bookworm AS build
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WORKDIR /src
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# Copy the whole workspace in one go. We used to do a two-pass "cache-prime
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# with stubs, then real build" dance for dep-compile reuse; that turned out
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# to silently serve stale stub binaries when cargo's fingerprint didn't
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# notice the source swap. A single build is ~1.5 min longer on cold cache
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# but guarantees the binary reflects the sources we copied.
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# Do not copy rust-toolchain.toml into the image. The local workspace pins
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# developer tooling, but inside Docker we intentionally use the Rust version
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# selected by the base image. Copying rust-toolchain.toml with
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# `channel = "stable"` makes rustup download a second full toolchain during
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# `cargo build`, which is slow and can exhaust small Colima/CI disks.
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COPY Cargo.toml Cargo.lock ./
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COPY crates/ crates/
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COPY --from=fetch /src/assets/ipxe /src/assets/ipxe
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# Cache cargo registry + target across builds. The `--no-edit` touch is
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# belt-and-suspenders: cargo occasionally misses mtime-only changes on
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# networked FS; this forces a fingerprint check.
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RUN --mount=type=cache,target=/usr/local/cargo/registry \
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--mount=type=cache,target=/src/target,sharing=locked \
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find crates -name '*.rs' -exec touch {} + && \
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cargo build --release --bin openpxe && \
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cp target/release/openpxe /openpxe && \
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ls -l /openpxe
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########## runtime ##########
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FROM debian:12-slim AS runtime
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RUN apt-get update \
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&& apt-get install -y --no-install-recommends \
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ca-certificates libcap2-bin tini gosu iproute2 \
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wimtools samba nfs-common \
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&& rm -rf /var/lib/apt/lists/* \
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&& useradd --system --uid 10001 --home-dir /var/lib/openpxe --shell /usr/sbin/nologin openpxe \
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&& mkdir -p /var/lib/openpxe/isos /var/lib/openpxe/work /var/lib/openpxe/smb \
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&& chown -R openpxe:openpxe /var/lib/openpxe
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# Runtime deps explained:
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# wimtools - provides `wimlib-imagex`, used to inject startnet.cmd into boot.wim.
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# samba - `smbd` serves extracted Windows install media on :445 for WinPE
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# to `net use`. Guest read-only, scoped to /var/lib/openpxe/smb.
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# nfs-common - provides `mount.nfs` / `mount.nfs4` for the Storage tab's
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# NFS share manager. Mount also requires the container to run
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# with CAP_SYS_ADMIN — without it, mount(2) returns EPERM and
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# the manager surfaces a clear error in the UI instead of
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# failing silently.
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# iproute2 - `ip addr` / `ip route` for the auto-detected Network tab
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# fields (NIC name, subnet mask, default gateway). Tiny,
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# always available; we don't pull in netlink crates for
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# this one-shot startup probe.
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# gosu - drops privileges cleanly from root after the entrypoint fixes
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# bind-mount ownership (common OpenShift/Docker UX issue).
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# Windows-specific tools only activate when the WebUI toggle is on.
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COPY --from=build /openpxe /usr/local/bin/openpxe
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COPY deploy/docker/entrypoint.sh /usr/local/bin/entrypoint.sh
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RUN chmod +x /usr/local/bin/entrypoint.sh
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# Grant the binary the ability to bind <1024 ports as a non-root user.
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# This is the only capability OpenPXE needs for proxy-mode DHCP + TFTP + HTTP.
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RUN setcap cap_net_bind_service=+ep /usr/local/bin/openpxe
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# IMPORTANT: we do NOT `USER openpxe` here. The entrypoint runs as root,
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# chowns the mounted data dirs, then execs the binary via gosu as openpxe.
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# OpenShift ignores USER directives anyway (it injects its own uid), and
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# there entrypoint.sh's non-root branch just execs directly.
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WORKDIR /var/lib/openpxe
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ENV OPENPXE_ISO_DIR=/var/lib/openpxe/isos \
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OPENPXE_WORK_DIR=/var/lib/openpxe/work \
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OPENPXE_LOG=info,openpxe=info
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EXPOSE 67/udp 69/udp 4011/udp 80/tcp 445/tcp
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ENTRYPOINT ["/usr/bin/tini", "--", "/usr/local/bin/entrypoint.sh"]
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