Multus CNI v4.3.1 build recipe

github.com/k8snetworkplumbingwg/multus-cni (v4.3.1) at d61706810cc8be60381dcb66e6a2428d5eb2795a

Fetched once, with the network on, by the vendor step (Dockerfile.vendor) when the kit was made; the offline build uses the kit's vendored copies:

• git https://github.com/k8snetworkplumbingwg/multus-cni v4.3.1
• https://github.com/canonical/chisel/releases/download/v1.5.1/chisel_v1.5.1_linux_amd64.tar.gz
• https://github.com/canonical/chisel-releases/archive/f2600d3aa90123db6d44bb1441a99afc8b5847d9.tar.gz

• Base imagegolang:1.26.10-bookworm@sha256:632dff7351799a5a9954a48dc06670ade72ee44e8c351cdc0e5a57af2fea21af
• Base imageubuntu:24.04@sha256:fe81560990fae86dc4743202b2cb4d3df98d0bcf949173cecef15ce1127ef852
• BuildKitmoby/buildkit:v0.31.2
  sha256:e0e67ea9c4bb07bdef683e29f70f3b623d1eb9c82274a9ec04e6bb0511449fb0
• Build methodsource-rebuild-go
• SOURCE_DATE_EPOCH1788537051 (2026-09-04T15:50:51Z)
• Target digest (linux/amd64)sha256:f90014221243e98cf21d56dc66e3f53bf386c1c1484a633e550dadf4e39f324e
• Target config digestsha256:23e11f363b6ee009075d79d35f1fb4fe714566c8b967edf1ea6cbb891fa079f7
• Checksummed kit files5,503 (CHECKSUMS.sha256)

# GENERATED L-009 hermetic build (--network=none, SBOM+SLSA-attestation-producing).
# Pinned bases from BASE_IMAGE_DIGESTS.lock; vendored Go tree + debs from Dockerfile.vendor.
FROM golang:1.26.10-bookworm@sha256:632dff7351799a5a9954a48dc06670ade72ee44e8c351cdc0e5a57af2fea21af AS build_multus
WORKDIR /src
COPY vendored/multuscni-src/ .
ENV CGO_ENABLED=0 GOTOOLCHAIN=local GOWORK=off GOFLAGS="-mod=vendor -buildvcs=false" GOPROXY=off SOURCE_DATE_EPOCH=1788537051
RUN go build -trimpath -ldflags='-X gopkg.in/k8snetworkplumbingwg/multus-cni.v4/pkg/multus.version=v4.3.1 -X gopkg.in/k8snetworkplumbingwg/multus-cni.v4/pkg/multus.commit=d61706810cc8be60381dcb66e6a2428d5eb2795a -X gopkg.in/k8snetworkplumbingwg/multus-cni.v4/pkg/multus.gitTreeState=dirty -X gopkg.in/k8snetworkplumbingwg/multus-cni.v4/pkg/multus.releaseStatus=,released -X gopkg.in/k8snetworkplumbingwg/multus-cni.v4/pkg/multus.date=2026-09-04T15:50:51+00:00' -o /multus ./cmd/multus && /multus -version > /tmp/multus.version 2>&1; cat /tmp/multus.version; grep -qF 'version:v4.3.1(dirty,released), commit:d61706810cc8be60381dcb66e6a2428d5eb2795a' /tmp/multus.version || { echo 'multus -version does not report version:v4.3.1(dirty,released), commit:d61706810cc8be60381dcb66e6a2428d5eb2795a'; exit 1; } && \
    { readelf -lW /multus | sed -n 's/.*Requesting program interpreter: \(.*\)]$/\1/p'; readelf -dW /multus | sed -n 's/.*Shared library: \[\(.*\)\]$/\1/p'; } > /multus.needs
FROM golang:1.26.10-bookworm@sha256:632dff7351799a5a9954a48dc06670ade72ee44e8c351cdc0e5a57af2fea21af AS build_multus-daemon
WORKDIR /src
COPY vendored/multuscni-src/ .
ENV CGO_ENABLED=0 GOTOOLCHAIN=local GOWORK=off GOFLAGS="-mod=vendor -buildvcs=false" GOPROXY=off SOURCE_DATE_EPOCH=1788537051
RUN go build -trimpath -ldflags='-X gopkg.in/k8snetworkplumbingwg/multus-cni.v4/pkg/multus.version=v4.3.1 -X gopkg.in/k8snetworkplumbingwg/multus-cni.v4/pkg/multus.commit=d61706810cc8be60381dcb66e6a2428d5eb2795a -X gopkg.in/k8snetworkplumbingwg/multus-cni.v4/pkg/multus.gitTreeState=dirty -X gopkg.in/k8snetworkplumbingwg/multus-cni.v4/pkg/multus.releaseStatus=,released -X gopkg.in/k8snetworkplumbingwg/multus-cni.v4/pkg/multus.date=2026-09-04T15:50:51+00:00' -o /multus-daemon ./cmd/multus-daemon && /multus-daemon -version > /tmp/multus-daemon.version 2>&1; cat /tmp/multus-daemon.version; grep -qF 'version:v4.3.1(dirty,released)' /tmp/multus-daemon.version || { echo 'multus-daemon -version does not report version:v4.3.1(dirty,released)'; exit 1; } && \
    { readelf -lW /multus-daemon | sed -n 's/.*Requesting program interpreter: \(.*\)]$/\1/p'; readelf -dW /multus-daemon | sed -n 's/.*Shared library: \[\(.*\)\]$/\1/p'; } > /multus-daemon.needs
FROM golang:1.26.10-bookworm@sha256:632dff7351799a5a9954a48dc06670ade72ee44e8c351cdc0e5a57af2fea21af AS build_multus-shim
WORKDIR /src
COPY vendored/multuscni-src/ .
ENV CGO_ENABLED=0 GOTOOLCHAIN=local GOWORK=off GOFLAGS="-mod=vendor -buildvcs=false" GOPROXY=off SOURCE_DATE_EPOCH=1788537051
RUN go build -trimpath -ldflags='-X gopkg.in/k8snetworkplumbingwg/multus-cni.v4/pkg/multus.version=v4.3.1 -X gopkg.in/k8snetworkplumbingwg/multus-cni.v4/pkg/multus.commit=d61706810cc8be60381dcb66e6a2428d5eb2795a -X gopkg.in/k8snetworkplumbingwg/multus-cni.v4/pkg/multus.gitTreeState=dirty -X gopkg.in/k8snetworkplumbingwg/multus-cni.v4/pkg/multus.releaseStatus=,released -X gopkg.in/k8snetworkplumbingwg/multus-cni.v4/pkg/multus.date=2026-09-04T15:50:51+00:00' -o /multus-shim ./cmd/multus-shim && /multus-shim -version > /tmp/multus-shim.version 2>&1; cat /tmp/multus-shim.version; grep -qF 'version:v4.3.1(dirty,released)' /tmp/multus-shim.version || { echo 'multus-shim -version does not report version:v4.3.1(dirty,released)'; exit 1; } && \
    { readelf -lW /multus-shim | sed -n 's/.*Requesting program interpreter: \(.*\)]$/\1/p'; readelf -dW /multus-shim | sed -n 's/.*Shared library: \[\(.*\)\]$/\1/p'; } > /multus-shim.needs
FROM golang:1.26.10-bookworm@sha256:632dff7351799a5a9954a48dc06670ade72ee44e8c351cdc0e5a57af2fea21af AS build_install_multus
WORKDIR /src
COPY vendored/multuscni-src/ .
ENV CGO_ENABLED=0 GOTOOLCHAIN=local GOWORK=off GOFLAGS="-mod=vendor -buildvcs=false" GOPROXY=off SOURCE_DATE_EPOCH=1788537051

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#!/usr/bin/env bash
# =============================================================================
# ReadyStack — offline reproducible rebuild.
#
# Rebuilds this product's image from THIS ARCHIVE ALONE, with no network access
# of any kind, and prints the resulting linux/amd64 image-manifest digest.
# Run ./VERIFY_OFFLINE.sh afterwards to assert it equals the published digest.
#
# Requirements: linux/amd64 Docker host, docker buildx >= 0.30, jq, tar.
# No git, no registry access, no additional tooling.
#
#   ./BUILD_OFFLINE.sh                the rebuild (OCI image + a docker-loadable copy)
#   ./BUILD_OFFLINE.sh --provenance   the same rebuild with SLSA v1 build provenance (mode=max) attached to the OCI
#                                     image, generated by BuildKit, not by any build step. Run on your own hardened,
#                                     isolated build platform and sign that provenance with a key the build cannot
#                                     reach, and the result meets SLSA Build Level 3 (see REBUILD.md). The image
#                                     digest is the same either way.
# =============================================================================
set -euo pipefail
PROVENANCE=0
for arg in "$@"; do
  case "$arg" in
    --provenance) PROVENANCE=1 ;;
    -h|--help) sed -n '2,20p' "$0"; exit 0 ;;

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