Normalize certificate flag names

This changes the flag names to use certificate instead of
the abbreviated cert. To avoid breaking clients, we add
a global alias that translates between the two.

Signed-off-by: Hayden Blauzvern <hblauzvern@google.com>

cmd/cosign/cli/commands.go

@@ -21,6 +21,7 @@ import (
 	"github.com/google/go-containerregistry/pkg/logs"
 	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
+	"github.com/spf13/pflag"
 	"sigs.k8s.io/release-utils/version"
 
 	cranecmd "github.com/google/go-containerregistry/cmd/crane/cmd"
@@ -31,6 +32,22 @@ var (
 	ro = &options.RootOptions{}
 )
 
+func normalizeCertificateFlags(_ *pflag.FlagSet, name string) pflag.NormalizedName {
+	switch name {
+	case "cert":
+		name = "certificate"
+	case "cert-email":
+		name = "certificate-email"
+	case "cert-chain":
+		name = "certificate-chain"
+	case "cert-oidc-issuer":
+		name = "certificate-oidc-issuer"
+	case "output-cert":
+		name = "output-certificate"
+	}
+	return pflag.NormalizedName(name)
+}
+
 func New() *cobra.Command {
 	var (
 		out, stdout *os.File
@@ -97,5 +114,8 @@ func New() *cobra.Command {
 	cmd.AddCommand(version.WithFont("starwars"))
 
 	cmd.AddCommand(cranecmd.NewCmdAuthLogin("cosign"))
+
+	cmd.SetGlobalNormalizationFunc(normalizeCertificateFlags)
+
 	return cmd
 }

cmd/cosign/cli/options/attest.go

@@ -51,10 +51,10 @@ func (o *AttestOptions) AddFlags(cmd *cobra.Command) {
 	cmd.Flags().StringVar(&o.Key, "key", "",
 		"path to the private key file, KMS URI or Kubernetes Secret")
 
-	cmd.Flags().StringVar(&o.Cert, "cert", "",
+	cmd.Flags().StringVar(&o.Cert, "certificate", "",
 		"path to the X.509 certificate in PEM format to include in the OCI Signature")
 
-	cmd.Flags().StringVar(&o.CertChain, "cert-chain", "",
+	cmd.Flags().StringVar(&o.CertChain, "certificate-chain", "",
 		"path to a list of CA X.509 certificates in PEM format which will be needed "+
 			"when building the certificate chain for the signing certificate. "+
 			"Must start with the parent intermediate CA certificate of the "+

cmd/cosign/cli/options/certificate.go

@@ -31,16 +31,16 @@ var _ Interface = (*RekorOptions)(nil)
 
 // AddFlags implements Interface
 func (o *CertVerifyOptions) AddFlags(cmd *cobra.Command) {
-	cmd.Flags().StringVar(&o.Cert, "cert", "",
+	cmd.Flags().StringVar(&o.Cert, "certificate", "",
 		"path to the public certificate")
 
-	cmd.Flags().StringVar(&o.CertEmail, "cert-email", "",
+	cmd.Flags().StringVar(&o.CertEmail, "certificate-email", "",
 		"the email expected in a valid Fulcio certificate")
 
-	cmd.Flags().StringVar(&o.CertOidcIssuer, "cert-oidc-issuer", "",
+	cmd.Flags().StringVar(&o.CertOidcIssuer, "certificate-oidc-issuer", "",
 		"the OIDC issuer expected in a valid Fulcio certificate, e.g. https://token.actions.githubusercontent.com or https://oauth2.sigstore.dev/auth")
 
-	cmd.Flags().StringVar(&o.CertChain, "cert-chain", "",
+	cmd.Flags().StringVar(&o.CertChain, "certificate-chain", "",
 		"path to a list of CA certificates in PEM format which will be needed "+
 			"when building the certificate chain for the signing certificate. "+
 			"Must start with the parent intermediate CA certificate of the "+

cmd/cosign/cli/options/sign.go

@@ -55,10 +55,10 @@ func (o *SignOptions) AddFlags(cmd *cobra.Command) {
 	cmd.Flags().StringVar(&o.Key, "key", "",
 		"path to the private key file, KMS URI or Kubernetes Secret")
 
-	cmd.Flags().StringVar(&o.Cert, "cert", "",
+	cmd.Flags().StringVar(&o.Cert, "certificate", "",
 		"path to the X.509 certificate in PEM format to include in the OCI Signature")
 
-	cmd.Flags().StringVar(&o.CertChain, "cert-chain", "",
+	cmd.Flags().StringVar(&o.CertChain, "certificate-chain", "",
 		"path to a list of CA X.509 certificates in PEM format which will be needed "+
 			"when building the certificate chain for the signing certificate. "+
 			"Must start with the parent intermediate CA certificate of the "+