Introduce attestation metadata #3342
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We can now attach a reason for why each attestation was generated, which will in future allow us to include/exclude specific attestation types from exporters if desired. Signed-off-by: Justin Chadwell <me@jedevc.com>
Signed-off-by: Justin Chadwell <me@jedevc.com>
Signed-off-by: Justin Chadwell <me@jedevc.com>
jedevc
commented
Nov 30, 2022
| @@ -68,6 +66,11 @@ func ProvenanceProcessor(attrs map[string]string) llbsolver.Processor { | |||
| } | |||
| } | |||
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| var inlineOnly bool | |||
| if v, err := strconv.ParseBool(attrs["inline-only"]); v && err == nil { | |||
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I'm not a fan of inline-only as the name of the option in hindsight. 1. It has a different meaning to inline for the exporters, and 2. it's not clear what property makes image/oci inline but not local/tar.
Other ideas welcome here 🎉
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I'm not a fan of inline-only
attach / embed maybe?
tonistiigi
reviewed
Dec 6, 2022
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Signed-off-by: Justin Chadwell <me@jedevc.com>
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tonistiigi
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Dec 6, 2022
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This will be useful to help with default values for docker/buildx#1412.
With this PR, buildx can attach the option
--opt attest:provenance=mode=min,inline-only=true. Thisinline-onlyoption is propagated through attestation metadata to the exporter, where it can be filtered out for the local/tar exporters, while being included for the image/oci/docker exporters. We could achieve similar functionality if we attempted to explicitly modify the exporter properties in buildx, but this would be overly complex logic to put into the client.Additionally, I've added a
reasonfield to the metadata, which can be optionally added to the metadata on attestation creation indicating the purpose of the attestation - in the future, this could be used by the exporter to filter out specific attestations for exporters (will be useful when we support multiple exporters, if different attestation output is desired). We could also (maybe) use the metadata in the SBOM scanner component to detect if the scanner has already run instead of relying on checking the predicate types.