bom

bom — AICR Container Image Bill-of-Materials

Generates an authoritative inventory of every container image AICR can deploy. Renders each Helm chart in recipes/registry.yaml at its pinned version, extracts recognized container-image references, walks embedded manifests under recipes/components/<name>/manifests/, and emits:

• bom.cdx.json — CycloneDX 1.6 JSON (canonical, machine-readable)
• bom.md — human-readable Markdown summary

This is a reference BOM: it lists images that would be deployed at the pinned chart versions, based on rendering. It does not pull or scan the images themselves — that belongs to a separate provenance audit.

Architecture

Reusable BOM logic lives in pkg/bom: YAML image extraction, image reference parsing, CycloneDX assembly, Markdown rendering. This tool is a thin CLI wrapper that loads recipes/registry.yaml, shells out to helm template per chart, and walks embedded manifest directories. pkg/bom is also intended for consumption by pkg/bundler to emit a per-bundle SBOM during aicr bundle.

Usage

From the repo root:

# Default — writes to dist/bom/
make bom

# Skip helm rendering (manifest-only, no network needed)
BOM_SKIP_HELM=1 make bom

# Fail on unpinned chart versions or render errors
BOM_STRICT=1 make bom

# Custom output directory
BOM_OUT_DIR=/tmp/aicr-bom make bom

Direct invocation:

go run ./tools/bom -repo-root . -out-dir /tmp/bom

Flags:

Output schema

bom.cdx.json is CycloneDX 1.6 with this modeling:

• metadata.component — AICR itself (type: application).
• components[] contains:
  • One entry per AICR component (type: application, bom-ref: aicr/<name>) with helm chart metadata in properties[].
  • One entry per unique container image (type: container, bom-ref: img:<image>, purl: pkg:oci/<name>@<version>?repository_url=...).
• dependencies[] expresses the deployment graph:
  • aicr → all aicr/<name> refs
  • Each aicr/<name> → its image refs

This shape is consumable by Trivy, Grype, Cosign attestation, and most supply-chain dashboards without conversion.

Limitations

• Charts that fail to render (missing required values, network unreachable) emit a warning property on the component and contribute zero images. Use -strict to make these fatal.
• Image extraction recognizes scalar image: values and mapping-valued image: or scalingPodImage: descriptors using the name, repository, and tag fields. A present field must be a non-null, non-empty scalar. Violations stop generation in all modes rather than publishing an incomplete reference. Other fields are ignored. Descriptors that rely on separate registry or digest fields are unsupported and can yield an incomplete or incorrectly resolved reference.
• False positives are possible but rare in valid Kubernetes manifests. CRDs that use image as an unrelated scalar field may be flagged.
• Unrendered Go template directives ({{ .Values.image }}) are skipped — they appear when the chart's values don't supply a required override.