NATS v2.15.2 build recipe

github.com/nats-io/nats-server (v2.15.2) at 5a815f11a911efa2c88fd1dbfb18ed89a449bfc1

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/nats-io/nats-server v2.15.2
• 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:1.27.3-bookworm@sha256:972b4110ba0f47539a975c31e52c64765e1ff19f2d74469ae4a595c6676e80a5
• Base imageubuntu:24.04@sha256:24737cef17f4e22b1977df7d9a05e77c4e28b7da5b8911f8d8ccda136bf3573c
• BuildKitmoby/buildkit:v0.31.2
  sha256:e0e67ea9c4bb07bdef683e29f70f3b623d1eb9c82274a9ec04e6bb0511449fb0
• Build methodsource-rebuild-go
• SOURCE_DATE_EPOCH1793028235 (2026-10-26T15:23:55Z)
• Target digest (linux/amd64)sha256:ed77bffbe5e2c9ab2740c0a09f618e1f6b62371a91523126bd975fa118dfbf02
• Target config digestsha256:21ad6a6e0cef48a353861486c53975e42908a5e74d633da1c8bdc77e9ba3de44
• Checksummed kit files2,009 (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:1.27.3-bookworm@sha256:972b4110ba0f47539a975c31e52c64765e1ff19f2d74469ae4a595c6676e80a5 AS build_nats-server
WORKDIR /src
COPY vendored/nats-src/ .
ENV CGO_ENABLED=0 GOTOOLCHAIN=local GOWORK=off GOFLAGS="-mod=vendor -buildvcs=false" GOPROXY=off SOURCE_DATE_EPOCH=1793028235
RUN go build -trimpath -ldflags='-w -X github.com/nats-io/nats-server/v2/server.gitCommit=5a815f1 -X github.com/nats-io/nats-server/v2/server.serverVersion=v2.15.2' -o /nats-server . && /nats-server --version > /tmp/nats-server.version 2>&1; cat /tmp/nats-server.version; grep -qF 'nats-server: v2.15.2' /tmp/nats-server.version || { echo 'nats-server --version does not report nats-server: v2.15.2'; exit 1; } && \
    { readelf -lW /nats-server | sed -n 's/.*Requesting program interpreter: \(.*\)]$/\1/p'; readelf -dW /nats-server | sed -n 's/.*Shared library: \[\(.*\)\]$/\1/p'; } > /nats-server.needs
# rs-probe: the HEALTHCHECK helper (standard library only, from the kit's rs-probe.go)
FROM golang:1.27.3-bookworm@sha256:972b4110ba0f47539a975c31e52c64765e1ff19f2d74469ae4a595c6676e80a5 AS build_rs_probe
WORKDIR /probe
COPY rs-probe.go main.go
COPY rs-probe.mod go.mod
ENV CGO_ENABLED=0 GOTOOLCHAIN=local GOFLAGS="-buildvcs=false" GOPROXY=off SOURCE_DATE_EPOCH=1793028235
RUN go build -trimpath -ldflags='-s -w' -o /rs-probe .
# the chiselled rootfs (vendored/chisel, cut by Dockerfile.vendor), the service user, the binaries
FROM ubuntu:24.04@sha256:24737cef17f4e22b1977df7d9a05e77c4e28b7da5b8911f8d8ccda136bf3573c AS rootfs
ARG SOURCE_DATE_EPOCH=1793028235
ADD vendored/chisel/rootfs.tar /rootfs/
RUN printf 'nats:x:999:999::/var/lib/nats:/bin/sh\n' >> /rootfs/etc/passwd && printf 'nats:x:999:\n' >> /rootfs/etc/group && \
    mkdir -p /rootfs/var/lib/nats /rootfs/data && chown -R 999:999 /rootfs/var/lib/nats /rootfs/data
COPY --from=build_nats-server /nats-server /rootfs/usr/bin/nats-server
COPY --from=build_nats-server /nats-server.needs /tmp/needs/nats-server
COPY --from=build_rs_probe /rs-probe /rootfs/usr/local/bin/rs-probe

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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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