operations

type Operation struct {
	// Reason is why the operation will be run
	Reason string
	// IFDPath is the path to the IFD to operate on in the dataset
	IFDPath string
	// Fields is the desired state of some EXIF fields
	Fields map[string]interface{}

	// ModTime if set will trigger the operation exec to update the mtime of the
	// file to the DateTimeOriginal of the image.
	ModTime bool
}