build: set record provenance in response

Signed-off-by: CrazyMax <1951866+crazy-max@users.noreply.github.com>

util/confutil/metadata.go

@@ -0,0 +1,35 @@
+package confutil
+
+import (
+	"os"
+	"strconv"
+)
+
+// MetadataProvenanceMode is the type for setting provenance in the metdata file
+type MetadataProvenanceMode int
+
+const (
+	// MetadataProvenanceModeMin sets minimal provenance (default)
+	MetadataProvenanceModeMin MetadataProvenanceMode = iota
+	// MetadataProvenanceModeMax sets full provenance
+	MetadataProvenanceModeMax
+	// MetadataProvenanceModeDisabled doesn't set provenance
+	MetadataProvenanceModeDisabled
+)
+
+// MetadataProvenance returns the provenance mode to set in the metadata file
+func MetadataProvenance() MetadataProvenanceMode {
+	bmp := os.Getenv("BUILDX_METADATA_PROVENANCE")
+	switch bmp {
+	case "min":
+		return MetadataProvenanceModeMin
+	case "max":
+		return MetadataProvenanceModeMax
+	case "disabled":
+		return MetadataProvenanceModeDisabled
+	}
+	if ok, err := strconv.ParseBool(bmp); err == nil && !ok {
+		return MetadataProvenanceModeDisabled
+	}
+	return MetadataProvenanceModeMin
+}