Canvas LMS 2026-05-20.143 build recipe

github.com/instructure/canvas-lms (release/2026-05-20.143) at 2e2b4a46d08e32667d4845f7b78e1214250345d3

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/instructure/canvas-lms release/2026-05-20.143
• https://cache.ruby-lang.org/pub/ruby/3.4/ruby-3.4.11.tar.gz
• https://cache.ruby-lang.org/pub/ruby/index.txt
• https://nodejs.org/dist/v20.20.2/node-v20.20.2-linux-x64.tar.gz
• https://nodejs.org/dist/v20.20.2/SHASUMS256.txt

• Base imageubuntu:24.04@sha256:68ee22004a9109b44973313b02ff7b1de250f1de0f5ecb628d73f579aaff33ac
• BuildKitmoby/buildkit:v0.31.2
  sha256:e0e67ea9c4bb07bdef683e29f70f3b623d1eb9c82274a9ec04e6bb0511449fb0
• Build methodsource-rebuild-ruby
• SOURCE_DATE_EPOCH1777557004 (2026-04-30T13:50:04Z)
• Target digest (linux/amd64)sha256:2b0596a737951dc92946f018e7dc6437cacc471eb62426a31d4ddd480fc1517c
• Target config digestsha256:4fa7522398a9a72ca95a2795ede5451870d81d58d156c8856b6322312ba47071
• Checksummed kit files50,750 (CHECKSUMS.sha256)

# GENERATED L-009 hermetic Ruby build (--network=none, SBOM+SLSA-attestation-producing).
# Compiles CRuby 3.4.11 from the vendored ruby-lang.org tarball and the native gems from vendor/cache, then
# copies Ruby + the installed bundle onto the pinned base with only runtime debs: no compiler, headers or Node.
FROM ubuntu:24.04@sha256:68ee22004a9109b44973313b02ff7b1de250f1de0f5ecb628d73f579aaff33ac AS rubybuild
ENV DEBIAN_FRONTEND=noninteractive LANG=C.UTF-8 BUNDLE_LOCKFILE=Gemfile.lock CANVAS_PINNED_GITHUB_GEMS=skoji/gepub:f0647345b806d993c2e59a84b490fdcb21979dec
RUN --mount=type=bind,source=vendored/debs,target=/tmp/debs --mount=type=bind,source=vendored/build-debs,target=/tmp/bdebs \
    set --; for f in /tmp/debs/*.deb /tmp/bdebs/*.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; }; }
ARG SOURCE_DATE_EPOCH=1777557004
ENV SOURCE_DATE_EPOCH=${SOURCE_DATE_EPOCH}
COPY vendored/ruby/ /tmp/ruby/
RUN cd /tmp/ruby && echo '5c22be44524312b3d433d68739bcc530633b1da5ef8ba0afa0a37680da17d3de  ruby-3.4.11.tar.gz' | sha256sum -c - && \
    tar -xzf ruby-3.4.11.tar.gz && cd ruby-3.4.11 && \
    ./configure --prefix=/usr/local --enable-shared --disable-install-doc --disable-install-static-library && \
    make -j"$(nproc)" && make install && \
    cd / && rm -rf /tmp/ruby && \
    find /usr/local/lib/ruby \( -name gem_make.out -o -name mkmf.log \) -delete && \
    ruby --version | grep -qF 'ruby 3.4.11'
COPY kitforge-ruby-gems.rb /tmp/kitforge-ruby-gems.rb
COPY vendored/ruby-gems/ /tmp/ruby-gems/
RUN ruby /tmp/kitforge-ruby-gems.rb install /tmp/ruby-gems net-imap=0.6.8 && \

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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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