add flag to allow skipping upload to transparency log

cmd/cosign/cli/attest.go

@@ -81,7 +81,7 @@ func Attest() *cobra.Command {
 			}
 			for _, img := range args {
 				if err := attest.AttestCmd(cmd.Context(), ko, o.Registry, img, o.Cert, o.CertChain, o.NoUpload,
-					o.Predicate.Path, o.Force, o.Predicate.Type, o.Replace, ro.Timeout); err != nil {
+					o.Predicate.Path, o.Force, o.Predicate.Type, o.Replace, ro.Timeout, o.NoTlogUpload); err != nil {
 					return fmt.Errorf("signing %s: %w", img, err)
 				}
 			}

cmd/cosign/cli/attest/attest.go

@@ -74,7 +74,7 @@ func uploadToTlog(ctx context.Context, sv *sign.SignerVerifier, rekorURL string,
 
 //nolint
 func AttestCmd(ctx context.Context, ko options.KeyOpts, regOpts options.RegistryOptions, imageRef string, certPath string, certChainPath string,
-	noUpload bool, predicatePath string, force bool, predicateType string, replace bool, timeout time.Duration) error {
+	noUpload bool, predicatePath string, force bool, predicateType string, replace bool, timeout time.Duration, noTlogUpload bool) error {
 	// A key file or token is required unless we're in experimental mode!
 	if options.EnableExperimental() {
 		if options.NOf(ko.KeyRef, ko.Sk) > 1 {
@@ -161,7 +161,7 @@ func AttestCmd(ctx context.Context, ko options.KeyOpts, regOpts options.Registry
 	}
 
 	// Check whether we should be uploading to the transparency log
-	if sign.ShouldUploadToTlog(ctx, digest, force, ko.RekorURL) {
+	if sign.ShouldUploadToTlog(ctx, digest, force, noTlogUpload, ko.RekorURL) {
 		bundle, err := uploadToTlog(ctx, sv, ko.RekorURL, func(r *client.Rekor, b []byte) (*models.LogEntryAnon, error) {
 			return cosign.TLogUploadInTotoAttestation(ctx, r, signedPayload, b)
 		})

cmd/cosign/cli/options/attest.go

@@ -29,6 +29,7 @@ type AttestOptions struct {
 	Recursive        bool
 	Replace          bool
 	SkipConfirmation bool
+	NoTlogUpload     bool
 
 	Rekor       RekorOptions
 	Fulcio      FulcioOptions
@@ -75,4 +76,7 @@ func (o *AttestOptions) AddFlags(cmd *cobra.Command) {
 
 	cmd.Flags().BoolVarP(&o.SkipConfirmation, "yes", "y", false,
 		"skip confirmation prompts for non-destructive operations")
+
+	cmd.Flags().BoolVar(&o.NoTlogUpload, "no-tlog-upload", false,
+		"whether to not upload the transparency log")
 }

cmd/cosign/cli/options/sign.go

@@ -33,6 +33,7 @@ type SignOptions struct {
 	Recursive         bool
 	Attachment        string
 	SkipConfirmation  bool
+	NoTlogUpload      bool
 
 	Rekor       RekorOptions
 	Fulcio      FulcioOptions
@@ -88,4 +89,7 @@ func (o *SignOptions) AddFlags(cmd *cobra.Command) {
 
 	cmd.Flags().BoolVarP(&o.SkipConfirmation, "yes", "y", false,
 		"skip confirmation prompts for non-destructive operations")
+
+	cmd.Flags().BoolVar(&o.NoTlogUpload, "no-tlog-upload", false,
+		"whether to not upload the transparency log")
 }

cmd/cosign/cli/sign.go

@@ -69,7 +69,11 @@ func Sign() *cobra.Command {
   cosign sign --key cosign.key --cert cosign.crt --cert-chain chain.crt <IMAGE>
 
   # sign a container in a registry which does not fully support OCI media types
-  COSIGN_DOCKER_MEDIA_TYPES=1 cosign sign --key cosign.key legacy-registry.example.com/my/image`,
+  COSIGN_DOCKER_MEDIA_TYPES=1 cosign sign --key cosign.key legacy-registry.example.com/my/image
+
+  # sign a container image and not upload transparency log
+  cosign sign --key cosign.key --no-tlog-upload=true <IMAGE>`,
+
 		Args: cobra.MinimumNArgs(1),
 		RunE: func(cmd *cobra.Command, args []string) error {
 			switch o.Attachment {
@@ -104,7 +108,7 @@ func Sign() *cobra.Command {
 				return err
 			}
 			if err := sign.SignCmd(ro, ko, o.Registry, annotationsMap.Annotations, args, o.Cert, o.CertChain, o.Upload,
-				o.OutputSignature, o.OutputCertificate, o.PayloadPath, o.Force, o.Recursive, o.Attachment); err != nil {
+				o.OutputSignature, o.OutputCertificate, o.PayloadPath, o.Force, o.Recursive, o.Attachment, o.NoTlogUpload); err != nil {
 				if o.Attachment == "" {
 					return fmt.Errorf("signing %v: %w", args, err)
 				}

cmd/cosign/cli/sign/sign.go

@@ -57,7 +57,7 @@ import (
 	_ "github.com/sigstore/cosign/pkg/providers/all"
 )
 
-func ShouldUploadToTlog(ctx context.Context, ref name.Reference, force bool, url string) bool {
+func ShouldUploadToTlog(ctx context.Context, ref name.Reference, force bool, noTlogUpload bool, url string) bool {
 	// Check whether experimental is on!
 	if !options.EnableExperimental() {
 		return false
@@ -66,6 +66,10 @@ func ShouldUploadToTlog(ctx context.Context, ref name.Reference, force bool, url
 	if force {
 		return true
 	}
+	// Check whether to not upload Tlog.
+	if noTlogUpload {
+		return false
+	}
 
 	// Check if the image is public (no auth in Get)
 	if _, err := remote.Get(ref, remote.WithContext(ctx)); err != nil {
@@ -97,7 +101,7 @@ func GetAttachedImageRef(ref name.Reference, attachment string, opts ...ociremot
 // nolint
 func SignCmd(ro *options.RootOptions, ko options.KeyOpts, regOpts options.RegistryOptions, annotations map[string]interface{},
 	imgs []string, certPath string, certChainPath string, upload bool, outputSignature, outputCertificate string,
-	payloadPath string, force bool, recursive bool, attachment string) error {
+	payloadPath string, force bool, recursive bool, attachment string, noTlogUpload bool) error {
 	if options.EnableExperimental() {
 		if options.NOf(ko.KeyRef, ko.Sk) > 1 {
 			return &options.KeyParseError{}
@@ -152,7 +156,7 @@ func SignCmd(ro *options.RootOptions, ko options.KeyOpts, regOpts options.Regist
 			if err != nil {
 				return fmt.Errorf("accessing image: %w", err)
 			}
-			err = signDigest(ctx, digest, staticPayload, ko, regOpts, annotations, upload, outputSignature, outputCertificate, force, recursive, dd, sv, se)
+			err = signDigest(ctx, digest, staticPayload, ko, regOpts, annotations, upload, outputSignature, outputCertificate, force, recursive, noTlogUpload, dd, sv, se)
 			if err != nil {
 				return fmt.Errorf("signing digest: %w", err)
 			}
@@ -172,7 +176,7 @@ func SignCmd(ro *options.RootOptions, ko options.KeyOpts, regOpts options.Regist
 			}
 			digest := ref.Context().Digest(d.String())
 
-			err = signDigest(ctx, digest, staticPayload, ko, regOpts, annotations, upload, outputSignature, outputCertificate, force, recursive, dd, sv, se)
+			err = signDigest(ctx, digest, staticPayload, ko, regOpts, annotations, upload, outputSignature, outputCertificate, force, recursive, noTlogUpload, dd, sv, se)
 			if err != nil {
 				return fmt.Errorf("signing digest: %w", err)
 			}
@@ -186,7 +190,7 @@ func SignCmd(ro *options.RootOptions, ko options.KeyOpts, regOpts options.Regist
 }
 
 func signDigest(ctx context.Context, digest name.Digest, payload []byte, ko options.KeyOpts,
-	regOpts options.RegistryOptions, annotations map[string]interface{}, upload bool, outputSignature, outputCertificate string, force bool, recursive bool,
+	regOpts options.RegistryOptions, annotations map[string]interface{}, upload bool, outputSignature, outputCertificate string, force bool, recursive bool, noTlogUpload bool,
 	dd mutate.DupeDetector, sv *SignerVerifier, se oci.SignedEntity) error {
 	var err error
 	// The payload can be passed to skip generation.
@@ -205,7 +209,7 @@ func signDigest(ctx context.Context, digest name.Digest, payload []byte, ko opti
 	if sv.Cert != nil {
 		s = ifulcio.NewSigner(s, sv.Cert, sv.Chain)
 	}
-	if ShouldUploadToTlog(ctx, digest, force, ko.RekorURL) {
+	if ShouldUploadToTlog(ctx, digest, force, noTlogUpload, ko.RekorURL) {
 		rClient, err := rekor.NewClient(ko.RekorURL)
 		if err != nil {
 			return err

cmd/cosign/cli/sign/sign_test.go

@@ -118,7 +118,7 @@ func TestSignCmdLocalKeyAndSk(t *testing.T) {
 			Sk:       true,
 		},
 	} {
-		err := SignCmd(ro, ko, options.RegistryOptions{}, nil, nil, "", "", false, "", "", "", false, false, "")
+		err := SignCmd(ro, ko, options.RegistryOptions{}, nil, nil, "", "", false, "", "", "", false, false, "", false)
 		if (errors.Is(err, &options.KeyParseError{}) == false) {
 			t.Fatal("expected KeyParseError")
 		}