credentials: implement errdefs types for typed errors

This allows for checking the error-type returned to be matched with
the errdefs utilities.

Signed-off-by: Sebastiaan van Stijn <[email protected]>

credentials/error.go

@@ -23,6 +23,11 @@ func (errCredentialsNotFound) Error() string {
 	return errCredentialsNotFoundMessage
 }
 
+// NotFound implements the [ErrNotFound][errdefs.ErrNotFound] interface.
+//
+// [errdefs.ErrNotFound]: https://pkg.go.dev/github.com/docker/[email protected]+incompatible/errdefs#ErrNotFound
+func (errCredentialsNotFound) NotFound() {}
+
 // NewErrCredentialsNotFound creates a new error
 // for when the credentials are not in the store.
 func NewErrCredentialsNotFound() error {
@@ -55,6 +60,12 @@ func (errCredentialsMissingServerURL) Error() string {
 	return errCredentialsMissingServerURLMessage
 }
 
+// InvalidParameter implements the [ErrInvalidParameter][errdefs.ErrInvalidParameter]
+// interface.
+//
+// [errdefs.ErrInvalidParameter]: https://pkg.go.dev/github.com/docker/[email protected]+incompatible/errdefs#ErrInvalidParameter
+func (errCredentialsMissingServerURL) InvalidParameter() {}
+
 // errCredentialsMissingUsername represents an error raised
 // when the credentials object has no username or when no
 // username is provided to a credentials operation requiring
@@ -65,6 +76,12 @@ func (errCredentialsMissingUsername) Error() string {
 	return errCredentialsMissingUsernameMessage
 }
 
+// InvalidParameter implements the [ErrInvalidParameter][errdefs.ErrInvalidParameter]
+// interface.
+//
+// [errdefs.ErrInvalidParameter]: https://pkg.go.dev/github.com/docker/[email protected]+incompatible/errdefs#ErrInvalidParameter
+func (errCredentialsMissingUsername) InvalidParameter() {}
+
 // NewErrCredentialsMissingServerURL creates a new error for
 // errCredentialsMissingServerURL.
 func NewErrCredentialsMissingServerURL() error {