build: forward all build opts everywhere

All build options should be passed everywhere - the frontend and the
backend of buildkit should both be able to see all attestations, as well
as all other opts: e.g. epoch settings, and no-cache.

Signed-off-by: Justin Chadwell <me@jedevc.com>

vendor/github.com/moby/buildkit/frontend/attestations/parse.go

@@ -1,81 +0,0 @@
-package attestations
-
-import (
-	"encoding/csv"
-	"strings"
-
-	"github.com/pkg/errors"
-)
-
-const (
-	KeyTypeSbom       = "sbom"
-	KeyTypeProvenance = "provenance"
-)
-
-const (
-	defaultSBOMGenerator = "docker/buildkit-syft-scanner:stable-1"
-)
-
-func Filter(v map[string]string) map[string]string {
-	attests := make(map[string]string)
-	for k, v := range v {
-		if strings.HasPrefix(k, "attest:") {
-			attests[k] = v
-			continue
-		}
-		if strings.HasPrefix(k, "build-arg:BUILDKIT_ATTEST_") {
-			attests[k] = v
-			continue
-		}
-	}
-	return attests
-}
-
-func Validate(values map[string]map[string]string) (map[string]map[string]string, error) {
-	for k := range values {
-		if k != KeyTypeSbom && k != KeyTypeProvenance {
-			return nil, errors.Errorf("unknown attestation type %q", k)
-		}
-	}
-	return values, nil
-}
-
-func Parse(values map[string]string) (map[string]map[string]string, error) {
-	attests := make(map[string]string)
-	for k, v := range values {
-		if strings.HasPrefix(k, "attest:") {
-			attests[strings.ToLower(strings.TrimPrefix(k, "attest:"))] = v
-			continue
-		}
-		if strings.HasPrefix(k, "build-arg:BUILDKIT_ATTEST_") {
-			attests[strings.ToLower(strings.TrimPrefix(k, "build-arg:BUILDKIT_ATTEST_"))] = v
-			continue
-		}
-	}
-
-	out := make(map[string]map[string]string)
-	for k, v := range attests {
-		attrs := make(map[string]string)
-		out[k] = attrs
-		if k == KeyTypeSbom {
-			attrs["generator"] = defaultSBOMGenerator
-		}
-		if v == "" {
-			continue
-		}
-		csvReader := csv.NewReader(strings.NewReader(v))
-		fields, err := csvReader.Read()
-		if err != nil {
-			return nil, errors.Wrapf(err, "failed to parse %s", k)
-		}
-		for _, field := range fields {
-			parts := strings.SplitN(field, "=", 2)
-			if len(parts) != 2 {
-				parts = append(parts, "")
-			}
-			attrs[parts[0]] = parts[1]
-		}
-	}
-
-	return Validate(out)
-}