Mattermost v12.0.1 build recipe

github.com/mattermost/mattermost (v12.0.1) at 987e57120dca630dadbcd2638064ab66a02bb81e

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/mattermost/mattermost v12.0.1
• https://deb.nodesource.com/setup_24.x

• Base imagegolang:1.26.10-bookworm@sha256:632dff7351799a5a9954a48dc06670ade72ee44e8c351cdc0e5a57af2fea21af
• Base imageubuntu:24.04@sha256:24737cef17f4e22b1977df7d9a05e77c4e28b7da5b8911f8d8ccda136bf3573c
• BuildKitmoby/buildkit:v0.31.2
  sha256:e0e67ea9c4bb07bdef683e29f70f3b623d1eb9c82274a9ec04e6bb0511449fb0
• Build methodsource-rebuild-go
• SOURCE_DATE_EPOCH1792655201 (2026-10-22T07:46:41Z)
• Target digest (linux/amd64)sha256:faf91c14c282d1d073b724193f997144c4f03824016c5a6b3766a212ad1b1a8d
• Target config digestsha256:467bbe83713db5debf557502caabba203f914a534c00d87cd818288811159395
• Checksummed kit files49,462 (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_mattermost
COPY vendored/mattermost-src/ /src/
WORKDIR /src/server
ENV CGO_ENABLED=0 GOTOOLCHAIN=local GOWORK=off GOFLAGS="-mod=vendor -buildvcs=false" GOPROXY=off SOURCE_DATE_EPOCH=1792655201
RUN go build -trimpath -tags "production" -ldflags='-s -w' -o /mattermost ./cmd/mattermost && /mattermost version
FROM golang:1.26.10-bookworm@sha256:632dff7351799a5a9954a48dc06670ade72ee44e8c351cdc0e5a57af2fea21af AS build_mmctl
COPY vendored/mattermost-src/ /src/
WORKDIR /src/server
ENV CGO_ENABLED=0 GOTOOLCHAIN=local GOWORK=off GOFLAGS="-mod=vendor -buildvcs=false" GOPROXY=off SOURCE_DATE_EPOCH=1792655201
RUN go build -trimpath -tags "production" -ldflags='-s -w' -o /mmctl ./cmd/mmctl && /mmctl version
FROM ubuntu:24.04@sha256:24737cef17f4e22b1977df7d9a05e77c4e28b7da5b8911f8d8ccda136bf3573c
ENV DEBIAN_FRONTEND=noninteractive MM_SERVICESETTINGS_LISTENADDRESS=:8065 MM_SERVICESETTINGS_SITEURL=http://localhost:8065 MM_PLUGINSETTINGS_DIRECTORY=/mattermost/plugins MM_PLUGINSETTINGS_CLIENTDIRECTORY=/mattermost/client/plugins MM_FILESETTINGS_DIRECTORY=/mattermost/data MM_LOGSETTINGS_FILELOCATION=/mattermost/logs MM_SQLSETTINGS_DRIVERNAME=postgres PATH=/mattermost/bin:$PATH
RUN --mount=type=bind,source=vendored/debs,target=/tmp/debs \
    set --; for f in /tmp/debs/*.deb; do [ -e "$f" ] && set -- "$@" "$f"; done; \
    for pass in 1 2 3 4 5; do [ $# -eq 0 ] || dpkg -i --skip-same-version "$@" >/dev/null 2>&1 && break; done; \
    dpkg --configure -a && bad= && for d in "$@"; do p=$(dpkg-deb -f "$d" Package) v=$(dpkg-deb -f "$d" Version); \
      case "$(dpkg-query -W -f='${Version} ${db:Status-Abbrev}' "$p" 2>/dev/null)" in "$v ii"*) ;; *) bad="$bad $p=$v" ;; esac; done && \
    { [ -z "$bad" ] || { echo "vendored debs not installed at their vendored version:$bad" >&2; false; }; } && \
    rm -rf /var/lib/apt/lists/* \
           /var/log/dpkg.log /var/log/alternatives.log /var/log/apt /var/cache/ldconfig/aux-cache /var/cache/fontconfig
ARG SOURCE_DATE_EPOCH=1792655201
RUN groupadd -r mattermost && useradd -r -g mattermost -d /mattermost -m mattermost && \

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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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