package store import ( "strings" "github.com/pkg/errors" ) var ( // errVolumeInUse is a typed error returned when trying to remove a volume that is currently in use by a container errVolumeInUse = errors.New("volume is in use") // errNoSuchVolume is a typed error returned if the requested volume doesn't exist in the volume store errNoSuchVolume = errors.New("no such volume") // errInvalidName is a typed error returned when creating a volume with a name that is not valid on the platform errInvalidName = errors.New("volume name is not valid on this platform") // errNameConflict is a typed error returned on create when a volume exists with the given name, but for a different driver errNameConflict = errors.New("volume name must be unique") ) // OpErr is the error type returned by functions in the store package. It describes // the operation, volume name, and error. type OpErr struct { // Err is the error that occurred during the operation. Err error // Op is the operation which caused the error, such as "create", or "list". Op string // Name is the name of the resource being requested for this op, typically the volume name or the driver name. Name string // Refs is the list of references associated with the resource. Refs []string } // Error satisfies the built-in error interface type. func (e *OpErr) Error() string { if e == nil { return "" } s := e.Op if e.Name != "" { s = s + " " + e.Name } s = s + ": " + e.Err.Error() if len(e.Refs) > 0 { s = s + " - " + "[" + strings.Join(e.Refs, ", ") + "]" } return s } // IsInUse returns a boolean indicating whether the error indicates that a // volume is in use func IsInUse(err error) bool { return isErr(err, errVolumeInUse) } // IsNotExist returns a boolean indicating whether the error indicates that the volume does not exist func IsNotExist(err error) bool { return isErr(err, errNoSuchVolume) } // IsNameConflict returns a boolean indicating whether the error indicates that a // volume name is already taken func IsNameConflict(err error) bool { return isErr(err, errNameConflict) } func isErr(err error, expected error) bool { err = errors.Cause(err) switch pe := err.(type) { case nil: return false case *OpErr: err = errors.Cause(pe.Err) } return err == expected }