feat: verify reviewed managed image digests

.github/workflows/validate.yml

@@ -81,6 +81,9 @@ jobs:
             --project test-app \
             --registry BAD \
             --engine-ref "$(git rev-parse HEAD)" \
+            --architecture amd64 \
+            --controller-image-digest "sha256:$(printf '1%.0s' {1..64})" \
+            --runner-image-digest "sha256:$(printf '2%.0s' {1..64})" \
             --output "${temporary_directory}/invalid.json"; then
             echo 'initializer accepted an invalid registry' >&2
             exit 1
@@ -90,5 +93,8 @@ jobs:
             --organization test-company \
             --project test-app \
             --engine-ref "$(git rev-parse HEAD)" \
+            --architecture amd64 \
+            --controller-image-digest "sha256:$(printf '1%.0s' {1..64})" \
+            --runner-image-digest "sha256:$(printf '2%.0s' {1..64})" \
             --output "${temporary_directory}/fleet.json"
           test "$(stat -c '%a' "${temporary_directory}/fleet.json")" = 644

controller/Dockerfile

@@ -1,20 +1,30 @@
-# syntax=docker/dockerfile:1.18
-FROM golang:1.26.5-bookworm AS build
+# syntax=docker/dockerfile:1.18@sha256:dabfc0969b935b2080555ace70ee69a5261af8a8f1b4df97b9e7fbcf6722eddf
+FROM golang:1.26.5-bookworm@sha256:53eeac89074db483fdf0ab3be1df32bf6e47562263d2d0d6baa7f26acb4957dd AS build
+ARG SOURCE_DATE_EPOCH=1786752000
 WORKDIR /src
-COPY go.mod *.go ./
-RUN go mod tidy && go mod verify
+COPY go.mod go.sum ./
+RUN go mod download && go mod verify
+COPY *.go ./
 RUN go test ./...
 ARG CI_FLEET_VERSION=dev
 ARG CI_FLEET_COMMIT=unknown
-RUN CGO_ENABLED=0 go build -trimpath -ldflags="-s -w -X main.version=${CI_FLEET_VERSION} -X main.commitSHA=${CI_FLEET_COMMIT}" -o /out/ci-fleet-controller .
+RUN CGO_ENABLED=0 go build -trimpath -ldflags="-s -w -X main.version=${CI_FLEET_VERSION} -X main.commitSHA=${CI_FLEET_COMMIT}" -o /out/ci-fleet-controller . \
+    && touch -d "@${SOURCE_DATE_EPOCH}" /out/ci-fleet-controller
 
-FROM debian:13.6-slim
+FROM debian:13.6-slim@sha256:3a39a0592364683e6bab97937b72cad5a8fa6dcbbee90edb3bb48c7f8e94f258
+ARG SOURCE_DATE_EPOCH=1786752000
+ARG DEBIAN_SNAPSHOT=20260815T000000Z
 ARG CI_FLEET_COMMIT=unknown
 LABEL org.opencontainers.image.revision="${CI_FLEET_COMMIT}" \
       io.randomdevelopment.ci-fleet.managed="true"
-RUN apt-get update && apt-get install -y --no-install-recommends ca-certificates \
+RUN --mount=type=bind,from=build,source=/out,target=/out \
+    rm -f /etc/apt/sources.list.d/debian.sources \
+    && printf 'deb http://snapshot.debian.org/archive/debian/%s trixie main\n' "$DEBIAN_SNAPSHOT" >/etc/apt/sources.list \
+    && apt-get -o Acquire::Check-Valid-Until=false update \
+    && apt-get install -y --no-install-recommends ca-certificates \
+    && install -m 0755 /out/ci-fleet-controller /usr/local/bin/ci-fleet-controller \
     && install -d -o 65532 -g 65532 /run/ci-fleet \
-    && rm -rf /var/lib/apt/lists/*
-COPY --from=build /out/ci-fleet-controller /usr/local/bin/ci-fleet-controller
+    && rm -rf /var/lib/apt/lists/* /var/log/apt/* /var/log/dpkg.log \
+    && find /etc /home /run /usr /var -xdev ! -path /etc/hostname ! -path /etc/hosts ! -path /etc/resolv.conf -newermt "@${SOURCE_DATE_EPOCH}" -exec touch -h -d "@${SOURCE_DATE_EPOCH}" {} +
 USER 65532:65532
 ENTRYPOINT ["/usr/local/bin/ci-fleet-controller"]

controller/go.mod

@@ -7,3 +7,38 @@ require (
 	github.com/docker/docker v28.5.2+incompatible
 	github.com/google/uuid v1.6.0
 )
+
+require (
+	github.com/Azure/go-ansiterm v0.0.0-20250102033503-faa5f7b0171c // indirect
+	github.com/Microsoft/go-winio v0.6.2 // indirect
+	github.com/cenkalti/backoff/v4 v4.3.0 // indirect
+	github.com/cespare/xxhash/v2 v2.3.0 // indirect
+	github.com/containerd/errdefs v1.0.0 // indirect
+	github.com/containerd/errdefs/pkg v0.3.0 // indirect
+	github.com/distribution/reference v0.6.0 // indirect
+	github.com/docker/go-connections v0.7.0 // indirect
+	github.com/docker/go-units v0.5.0 // indirect
+	github.com/felixge/httpsnoop v1.0.4 // indirect
+	github.com/go-logr/logr v1.4.4 // indirect
+	github.com/go-logr/stdr v1.2.2 // indirect
+	github.com/golang-jwt/jwt/v4 v4.5.2 // indirect
+	github.com/hashicorp/go-cleanhttp v0.5.2 // indirect
+	github.com/hashicorp/go-retryablehttp v0.7.8 // indirect
+	github.com/moby/docker-image-spec v1.3.1 // indirect
+	github.com/moby/sys/sequential v0.7.0 // indirect
+	github.com/opencontainers/go-digest v1.0.0 // indirect
+	github.com/opencontainers/image-spec v1.1.1 // indirect
+	github.com/pkg/errors v0.9.1 // indirect
+	go.opentelemetry.io/auto/sdk v1.2.1 // indirect
+	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.68.0 // indirect
+	go.opentelemetry.io/otel v1.45.0 // indirect
+	go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.45.0 // indirect
+	go.opentelemetry.io/otel/metric v1.45.0 // indirect
+	go.opentelemetry.io/otel/sdk v1.45.0 // indirect
+	go.opentelemetry.io/otel/sdk/metric v1.45.0 // indirect
+	go.opentelemetry.io/otel/trace v1.45.0 // indirect
+	go.opentelemetry.io/proto/otlp v1.11.0 // indirect
+	golang.org/x/net v0.57.0 // indirect
+	golang.org/x/sys v0.47.0 // indirect
+	google.golang.org/protobuf v1.36.11 // indirect
+)

controller/go.sum

@@ -0,0 +1,118 @@
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+golang.org/x/net v0.57.0/go.mod h1:KpXc8iv+r3XplLAG/f7Jsf9RPszJzdR0f58q9vGOuEU=
+golang.org/x/sys v0.0.0-20210616094352-59db8d763f22/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.47.0 h1:o7XGOvZQCADBQQ4Y7VNq2dRWQR7JmOUW8Kxx4ZsNgWs=
+golang.org/x/sys v0.47.0/go.mod h1:4GL1E5IUh+htKOUEOaiffhrAeqysfVGipDYzABqnCmw=
+golang.org/x/text v0.40.0 h1:Ub2Z6/xjgF1WrYQz2nuITOEegKFtiIy+rieRJ5lHZKs=
+golang.org/x/text v0.40.0/go.mod h1:hpnzDAfGV753zIKo+wk3u1bVKCGPbrnF7+7LBF/UHVY=
+golang.org/x/time v0.14.0 h1:MRx4UaLrDotUKUdCIqzPC48t1Y9hANFKIRpNx+Te8PI=
+golang.org/x/time v0.14.0/go.mod h1:eL/Oa2bBBK0TkX57Fyni+NgnyQQN4LitPmob2Hjnqw4=
+google.golang.org/genproto/googleapis/api v0.0.0-20260720211330-0afa2a65878a h1:97PfJ4tCxY5C7NzzgGqQEMZmXbISdvSArNNEOoUGKBg=
+google.golang.org/genproto/googleapis/api v0.0.0-20260720211330-0afa2a65878a/go.mod h1:1brfde68Npq6+WA75c1EHWPijZEG1kMus61ygPZfn4A=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20260720211330-0afa2a65878a h1:qI/YMH1ep2qQtqcp00gMQyoU7mjvbhg88GJKCvfoLj0=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20260720211330-0afa2a65878a/go.mod h1:4Hqkh8ycfw05ld/3BWL7rJOSfebL2Q+DVDeRgYgxUU8=
+google.golang.org/grpc v1.82.1 h1:NnAxzGRA0677vCa4BUkOAnO5+FfQqVl9iUXeD0IqcGE=
+google.golang.org/grpc v1.82.1/go.mod h1:yzTZ1TB1Z3SG+LIYaI+WiE8D5+PZ3ArnrSp8zF3+/ZA=
+google.golang.org/protobuf v1.36.11 h1:fV6ZwhNocDyBLK0dj+fg8ektcVegBBuEolpbTQyBNVE=
+google.golang.org/protobuf v1.36.11/go.mod h1:HTf+CrKn2C3g5S8VImy6tdcUvCska2kB7j23XfzDpco=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gotest.tools/v3 v3.5.2 h1:7koQfIKdy+I8UTetycgUqXWSDwpgv193Ka+qRsmBY8Q=
+gotest.tools/v3 v3.5.2/go.mod h1:LtdLGcnqToBH83WByAAi/wiwSFCArdFIUV/xxN4pcjA=

deploy/compose.yaml

@@ -7,6 +7,7 @@ services:
       context: ../runner
       args:
         CI_FLEET_COMMIT: ${CI_FLEET_COMMIT:-unknown}
+        SOURCE_DATE_EPOCH: ${SOURCE_DATE_EPOCH:-1786752000}
         RUNNER_VERSION: ${CI_FLEET_RUNNER_VERSION:-2.335.1}
     command: ["/bin/true"]
     deploy:
@@ -19,6 +20,7 @@ services:
       args:
         CI_FLEET_VERSION: ${CI_FLEET_VERSION:-dev}
         CI_FLEET_COMMIT: ${CI_FLEET_COMMIT:-unknown}
+        SOURCE_DATE_EPOCH: ${SOURCE_DATE_EPOCH:-1786752000}
     restart: unless-stopped
     user: "0:0"
     group_add:

docs/MANAGED-IMAGES.md

@@ -0,0 +1,59 @@
+# Reproducible managed images
+
+Managed controller and runner images have two independent pins:
+
+1. the engine checkout fixes all build instructions and checked module hashes;
+2. the reviewed private desired state maps that full engine commit to exact local Docker image IDs (`sha256:...`).
+
+Convergence rejects an image whose revision label is correct but whose image ID differs. A missing image is rebuilt only from the pinned engine release and accepted only when its rebuilt ID equals the reviewed value. Rollback applies the same check and deterministic rebuild before it starts the restored controller.
+
+## Reviewed upstream inputs
+
+Reviewed on 2026-08-16 from official upstream endpoints:
+
+| Input | Immutable selection | Evidence |
+| --- | --- | --- |
+| Debian 13.6 slim, both managed images | `sha256:3a39a0592364683e6bab97937b72cad5a8fa6dcbbee90edb3bb48c7f8e94f258` | Docker Hub registry manifest for `library/debian:13.6-slim` |
+| Go 1.26.5 Bookworm build image | `sha256:53eeac89074db483fdf0ab3be1df32bf6e47562263d2d0d6baa7f26acb4957dd` | Docker Hub registry manifest for `library/golang:1.26.5-bookworm` |
+| Debian packages | signed snapshot `20260815T000000Z` | `snapshot.debian.org/archive/debian/20260815T000000Z/dists/trixie/InRelease` |
+| Build timestamps | `SOURCE_DATE_EPOCH=1786752000` | BuildKit reproducible-build timestamp input declared in every stage |
+| Docker CLI 29.7.2 amd64 / arm64 | exact package version and SHA-256 `3d1a00d1549f7539606252b1e2b88ae2a0c855e02e5fa92ad962c8a118d7f6ad` / `6bb694f01789b9869e99e34df3492104c0150d12df93192034db5f88cf0f7c8c` | official Docker Debian `trixie` package index |
+| Compose plugin 5.4.0 amd64 / arm64 | exact package version and SHA-256 `75391b38459edf75a975504903673fdb87a5a4016d689d9b198e2db1ae2796e0` / `81261f286d48c1c9e586065bc52065bbbe3b023705ebdb72377ec465c216dcaf` | official Docker Debian `trixie` package index |
+| Actions Runner 2.335.1 | architecture-specific archive hashes in `runner/Dockerfile` | official GitHub Actions Runner release |
+| Controller modules | versions plus checksums in `controller/go.mod` and `controller/go.sum` | Go checksum-verified module inputs |
+
+The Dockerfiles fail closed if an upstream artifact no longer matches. Updating any pin requires a reviewed source change and new managed image IDs.
+
+## Record image IDs for an engine commit
+
+From a reviewed engine checkout on an authorized isolated build host, build both images twice from clean BuildKit state and compare IDs:
+
+```bash
+CI_FLEET_COMMIT=$(git rev-parse 'HEAD^{commit}')
+CI_FLEET_VERSION=$(git rev-parse --short=12 HEAD)
+SOURCE_DATE_EPOCH=1786752000
+export CI_FLEET_COMMIT CI_FLEET_VERSION SOURCE_DATE_EPOCH
+docker compose -f deploy/compose.yaml build --no-cache runner-image controller
+docker image inspect --format '{{.Id}}' \
+  "ci-fleet-controller:${CI_FLEET_COMMIT:0:12}" \
+  "ci-fleet-runner:${CI_FLEET_COMMIT:0:12}"
+```
+
+Repeat the build on every supported host architecture. After each architecture's repeated IDs match, add them to one private desired-state entry:
+
+```json
+"managed_images": {
+  "FULL_ENGINE_COMMIT": {
+    "amd64": {
+      "controller": "sha256:REVIEWED_AMD64_CONTROLLER_IMAGE_ID",
+      "runner": "sha256:REVIEWED_AMD64_RUNNER_IMAGE_ID"
+    },
+    "arm64": {
+      "controller": "sha256:REVIEWED_ARM64_CONTROLLER_IMAGE_ID",
+      "runner": "sha256:REVIEWED_ARM64_RUNNER_IMAGE_ID"
+    }
+  }
+}
+```
+
+The checked-in template uses conspicuous `111...` / `222...` non-production fixture IDs only so validation and mocked tests are runnable; replace them during initialization. The repository-only marathon does not run a Docker daemon or invent production IDs, so live private configuration remains an external evidence gate.