Build Comment Attestation For Free

Basically, it is an extension to the regular docker build command. Using docker buildx, we can create docker images that are compatible with multiple CPU architectures, such as AMD64, ARM64, etc.

Attestation Manifest Attestation manifests are attached to the root image index object, under a separate OCI image manifest. Each attestation manifest can contain multiple attestation blobs, with all the of the attestations in a manifest applying to a single platform manifest.

Buildx is the client and the user interface for running and managing builds. BuildKit is the server, or builder, that handles the build execution.

In docker build all builds finish by creating a container image and exporting it to docker images . buildx makes this step configurable allowing results to be exported directly to the client, oci image tarballs, registry etc. Buildx with docker driver currently only supports local, tarball exporter and image exporter.

$ docker buildx build --sbom=true --provenance=true . Provenance attestations are enabled by default, with the mode=min option. You can disable provenance attestations using the --provenance=false flag, or by setting the BUILDX_NO_DEFAULT_ATTESTATIONS environment variable.

DOCKER_BUILDKIT is an environment variable that tells docker to use BuildKit when building images. In contrast, Buildx builds using the BuildKit engine and does not require DOCKER_BUILDKIT=1 environment variable to start the builds. Details about DOCKER_BUILDKIT can be found in synxtax.md and this docker documentation.

Additionally, --provenance can be used with boolean values to broadly enable or disable provenance attestations. For example, --provenance=false can be used to disable all provenance attestations, while --provenance=true can be used to enable all provenance attestations.