docker/volume/volume_copy.go

package volume

import "strings"

const (
	// DefaultCopyMode is the copy mode used by default for normal/named volumes
	DefaultCopyMode = true
)

// {<copy mode>=isEnabled}
var copyModes = map[string]bool{
	"nocopy": false,
}

func copyModeExists(mode string) bool {
	_, exists := copyModes[mode]
	return exists
}

// GetCopyMode gets the copy mode from the mode string for mounts
func getCopyMode(mode string) (bool, bool) {
	for _, o := range strings.Split(mode, ",") {
		if isEnabled, exists := copyModes[o]; exists {
			return isEnabled, true
		}
	}
	return DefaultCopyMode, false
}