ostree: custom errors for ostree parameter validation

internal/ostree/errors.go

@@ -0,0 +1,35 @@
+package ostree
+
+import "fmt"
+
+// ResolveRefError is returned when there is a failure to resolve the
+// reference.
+type ResolveRefError struct {
+	msg string
+}
+
+func (e ResolveRefError) Error() string {
+	return e.msg
+}
+
+// NewResolveRefError creates and returns a new ResolveRefError with a given
+// formatted message.
+func NewResolveRefError(msg string, args ...interface{}) ResolveRefError {
+	return ResolveRefError{msg: fmt.Sprintf(msg, args...)}
+}
+
+// InvalidParamsError is returned when a parameter is invalid (e.g., malformed
+// or contains illegal characters).
+type InvalidParameterError struct {
+	msg string
+}
+
+func (e InvalidParameterError) Error() string {
+	return e.msg
+}
+
+// NewInvalidParameterError creates and returns a new InvalidParameterError
+// with a given formatted message.
+func NewInvalidParameterError(msg string, args ...interface{}) InvalidParameterError {
+	return InvalidParameterError{msg: fmt.Sprintf(msg, args...)}
+}