Use InvalidPolicyFormatError for invalid sigstore options

Signed-off-by: Miloslav Trmač <mitr@redhat.com>

signature/policy_config_sigstore.go

@@ -2,7 +2,6 @@ package signature
 
 import (
 	"encoding/json"
-	"errors"
 	"fmt"
 
 	"github.com/containers/image/v5/signature/internal"
@@ -15,7 +14,7 @@ type PRSigstoreSignedOption func(*prSigstoreSigned) error
 func PRSigstoreSignedWithKeyPath(keyPath string) PRSigstoreSignedOption {
 	return func(pr *prSigstoreSigned) error {
 		if pr.KeyPath != "" {
-			return errors.New(`"keyPath" already specified`)
+			return InvalidPolicyFormatError(`"keyPath" already specified`)
 		}
 		pr.KeyPath = keyPath
 		return nil
@@ -26,7 +25,7 @@ func PRSigstoreSignedWithKeyPath(keyPath string) PRSigstoreSignedOption {
 func PRSigstoreSignedWithKeyData(keyData []byte) PRSigstoreSignedOption {
 	return func(pr *prSigstoreSigned) error {
 		if pr.KeyData != nil {
-			return errors.New(`"keyData" already specified`)
+			return InvalidPolicyFormatError(`"keyData" already specified`)
 		}
 		pr.KeyData = keyData
 		return nil
@@ -37,7 +36,7 @@ func PRSigstoreSignedWithKeyData(keyData []byte) PRSigstoreSignedOption {
 func PRSigstoreSignedWithFulcio(fulcio PRSigstoreSignedFulcio) PRSigstoreSignedOption {
 	return func(pr *prSigstoreSigned) error {
 		if pr.Fulcio != nil {
-			return errors.New(`"fulcio" already specified`)
+			return InvalidPolicyFormatError(`"fulcio" already specified`)
 		}
 		pr.Fulcio = fulcio
 		return nil
@@ -48,7 +47,7 @@ func PRSigstoreSignedWithFulcio(fulcio PRSigstoreSignedFulcio) PRSigstoreSignedO
 func PRSigstoreSignedWithRekorPublicKeyPath(rekorPublicKeyPath string) PRSigstoreSignedOption {
 	return func(pr *prSigstoreSigned) error {
 		if pr.RekorPublicKeyPath != "" {
-			return errors.New(`"rekorPublicKeyPath" already specified`)
+			return InvalidPolicyFormatError(`"rekorPublicKeyPath" already specified`)
 		}
 		pr.RekorPublicKeyPath = rekorPublicKeyPath
 		return nil
@@ -59,7 +58,7 @@ func PRSigstoreSignedWithRekorPublicKeyPath(rekorPublicKeyPath string) PRSigstor
 func PRSigstoreSignedWithRekorPublicKeyData(rekorPublicKeyData []byte) PRSigstoreSignedOption {
 	return func(pr *prSigstoreSigned) error {
 		if pr.RekorPublicKeyData != nil {
-			return errors.New(`"rekorPublicKeyData" already specified`)
+			return InvalidPolicyFormatError(`"rekorPublicKeyData" already specified`)
 		}
 		pr.RekorPublicKeyData = rekorPublicKeyData
 		return nil
@@ -70,7 +69,7 @@ func PRSigstoreSignedWithRekorPublicKeyData(rekorPublicKeyData []byte) PRSigstor
 func PRSigstoreSignedWithSignedIdentity(signedIdentity PolicyReferenceMatch) PRSigstoreSignedOption {
 	return func(pr *prSigstoreSigned) error {
 		if pr.SignedIdentity != nil {
-			return errors.New(`"signedIdentity" already specified`)
+			return InvalidPolicyFormatError(`"signedIdentity" already specified`)
 		}
 		pr.SignedIdentity = signedIdentity
 		return nil
@@ -221,7 +220,7 @@ type PRSigstoreSignedFulcioOption func(*prSigstoreSignedFulcio) error
 func PRSigstoreSignedFulcioWithCAPath(caPath string) PRSigstoreSignedFulcioOption {
 	return func(f *prSigstoreSignedFulcio) error {
 		if f.CAPath != "" {
-			return errors.New(`"caPath" already specified`)
+			return InvalidPolicyFormatError(`"caPath" already specified`)
 		}
 		f.CAPath = caPath
 		return nil
@@ -232,7 +231,7 @@ func PRSigstoreSignedFulcioWithCAPath(caPath string) PRSigstoreSignedFulcioOptio
 func PRSigstoreSignedFulcioWithCAData(caData []byte) PRSigstoreSignedFulcioOption {
 	return func(f *prSigstoreSignedFulcio) error {
 		if f.CAData != nil {
-			return errors.New(`"caData" already specified`)
+			return InvalidPolicyFormatError(`"caData" already specified`)
 		}
 		f.CAData = caData
 		return nil
@@ -243,7 +242,7 @@ func PRSigstoreSignedFulcioWithCAData(caData []byte) PRSigstoreSignedFulcioOptio
 func PRSigstoreSignedFulcioWithOIDCIssuer(oidcIssuer string) PRSigstoreSignedFulcioOption {
 	return func(f *prSigstoreSignedFulcio) error {
 		if f.OIDCIssuer != "" {
-			return errors.New(`"oidcIssuer" already specified`)
+			return InvalidPolicyFormatError(`"oidcIssuer" already specified`)
 		}
 		f.OIDCIssuer = oidcIssuer
 		return nil
@@ -254,7 +253,7 @@ func PRSigstoreSignedFulcioWithOIDCIssuer(oidcIssuer string) PRSigstoreSignedFul
 func PRSigstoreSignedFulcioWithSubjectEmail(subjectEmail string) PRSigstoreSignedFulcioOption {
 	return func(f *prSigstoreSignedFulcio) error {
 		if f.SubjectEmail != "" {
-			return errors.New(`"subjectEmail" already specified`)
+			return InvalidPolicyFormatError(`"subjectEmail" already specified`)
 		}
 		f.SubjectEmail = subjectEmail
 		return nil