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bom (Bill of Materials)

PkgGoDev Go Report Card Slack

Create SPDX-compliant Bill of Materials

bom is a utility that leverages the code written for the Kubernetes Bill of Materials project. It enables software authors to generate an SBOM for their projects in a simple, yet powerful way.

terminal demo

bom is a general-purpose tool that can generate SPDX packages from directories, container images, single files, and other sources. The utility has a built-in license classifier that recognizes the 400+ licenses in the SPDX catalog.

Other features include Golang dependency analysis and full .gitignore support when scanning git repositories.

For more in-depth instructions on how to create an SBOM for your project, see "Generating a Bill of Materials for Your Project".

The guide includes information about what a Software Bill of Materials is, the SPDX standard, and instructions to add files, images, directories, and other sources to your SBOM.

Installation

To install bom:

go install sigs.k8s.io/bom/cmd/bom

Usage

  • completion: generate the autocompletion script for the specified shell
  • document: Work with SPDX documents
  • generate: Create SPDX manifests
  • help: Help about any command

bom generate

bom generate is the bom subcommand to generate SPDX manifests.

Currently supports creating SBOM from files, images, and docker archives (images in tarballs). It supports pulling images from remote registries for analysis.

bom can take a deeper look into images using a growing number of analyzers designed to add more sense to common base images.

The SBOM data can also be exported to an in-toto provenance attestation. The output will produce a provenance statement listing all the SPDX data as in-toto subjects, but otherwise ready to be completed by a later stage in your CI/CD pipeline. See the --provenance flag for more details.

Usage:
  bom generate [flags]

Flags:
  -a, --analyze-images          go deeper into images using the available analyzers
      --archive strings         list of archives to add as packages (supports tar, tar.gz)
  -c, --config string           path to yaml SBOM configuration file
  -d, --dirs strings            list of directories to include in the manifest as packages
  -f, --file strings            list of files to include
  -h, --help                    help for generate
      --ignore strings          list of regexp patterns to ignore when scanning directories
  -i, --image strings           list of images
      --image-archive strings   list of docker archive tarballs to include in the manifest
  -l, --license string          SPDX license identifier to declare in the SBOM
  -n, --namespace string        an URI that servers as namespace for the SPDX doc
      --no-gitignore            don't use exclusions from .gitignore files
      --no-gomod                don't perform go.mod analysis, sbom will not include data about go packages
      --no-transient            don't include transient go dependencies, only direct deps from go.mod
  -o, --output string           path to the file where the document will be written (defaults to STDOUT)
      --provenance string       path to export the SBOM as an in-toto provenance statement

Global Flags:
      --log-level string   the logging verbosity, either 'panic', 'fatal', 'error', 'warning', 'info', 'debug', 'trace' (default "info")

bom document

bom document → Work with SPDX documents

Usage:
  bom document [command]

Available Commands:
  outline     bom document outline → Draw structure of a SPDX document

Examples

The following examples show how bom can process different sources to generate an SPDX Bill of Materials. Multiple sources can be combined to get a document describing different packages.

Generate a SBOM from the Current Directory

To process a directory as a source for your SBOM, use the -d flag or simply pass the path as the first argument to bom:

bom generate -n http://example.com/ .

Process a Container Image

This example pulls the kube-apiserver image, analyzes it, and describes in the SBOM. Each of its layers are then expressed as a subpackage in the resulting document:

bom generate -n http://example.com/ --image registry.k8s.io/kube-apiserver:v1.21.0

Generate a SBOM to describe files

You can create an SBOM with just files in the manifest. For that, use -f:

bom generate -n http://example.com/ \
  -f Makefile \
  -f file1.exe \
  -f document.md \
  -f other/file.txt

Code of conduct

Participation in the Kubernetes community is governed by the Kubernetes Code of Conduct.