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moby--moby/volume/volume_propagation_linux.go

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// +build linux
package volume
import (
"strings"
mounttypes "github.com/docker/docker/api/types/mount"
)
// DefaultPropagationMode defines what propagation mode should be used by
// default if user has not specified one explicitly.
// propagation modes
const DefaultPropagationMode = mounttypes.PropagationRPrivate
var propagationModes = map[mounttypes.Propagation]bool{
mounttypes.PropagationPrivate: true,
mounttypes.PropagationRPrivate: true,
mounttypes.PropagationSlave: true,
mounttypes.PropagationRSlave: true,
mounttypes.PropagationShared: true,
mounttypes.PropagationRShared: true,
}
// GetPropagation extracts and returns the mount propagation mode. If there
// are no specifications, then by default it is "private".
func GetPropagation(mode string) mounttypes.Propagation {
for _, o := range strings.Split(mode, ",") {
prop := mounttypes.Propagation(o)
if propagationModes[prop] {
return prop
}
}
return DefaultPropagationMode
}
// HasPropagation checks if there is a valid propagation mode present in
// passed string. Returns true if a valid propagation mode specifier is
// present, false otherwise.
func HasPropagation(mode string) bool {
for _, o := range strings.Split(mode, ",") {
if propagationModes[mounttypes.Propagation(o)] {
return true
}
}
return false
}