SBOM4RPM uses existing rpm and dnf features to resolve all dependencies of one or multiple RPM packages and generates an SBOM for each .rpm.

Start a container for building the custom RPM project and mount its directory into it. For example:

podman run -it -v <path-to-project>:/var/<your-project> <build-container> /bin/bash

Proceed by building the custom RPM project and create a repomd (xml-based rpm metadata) repository for your output directory:

# assuming all rpms have been put into '/tmp/custom-artifacts'
createrepo_c /tmp/custom-artifacts

Then install and run SBOM4RPMs:

pip install sbom4rpms
sbom4rpms --rpm-dir=/tmp/custom-artifacts/ --collect-dependencies --sbom-format=spdx --sbom-dir=sboms

The example directory provides collected data and generated SBOMs for BlueChi.