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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 "<nil>"
}
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
}
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