d3eca4451d
Makes `docker volume ls` and `docker volume inspect` ask the volume drivers rather than only using what is cached locally. Previously in order to use a volume from an external driver, one would either have to use `docker volume create` or have a container that is already using that volume for it to be visible to the other volume API's. For keeping uniqueness of volume names in the daemon, names are bound to a driver on a first come first serve basis. If two drivers have a volume with the same name, the first one is chosen, and a warning is logged about the second one. Adds 2 new methods to the plugin API, `List` and `Get`. If a plugin does not implement these endpoints, a user will not be able to find the specified volumes as well requests go through the drivers. Signed-off-by: Brian Goff <cpuguy83@gmail.com>
74 lines
2.2 KiB
Go
74 lines
2.2 KiB
Go
package store
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import (
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"errors"
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"strings"
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)
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var (
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// errVolumeInUse is a typed error returned when trying to remove a volume that is currently in use by a container
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errVolumeInUse = errors.New("volume is in use")
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// errNoSuchVolume is a typed error returned if the requested volume doesn't exist in the volume store
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errNoSuchVolume = errors.New("no such volume")
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// errInvalidName is a typed error returned when creating a volume with a name that is not valid on the platform
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errInvalidName = errors.New("volume name is not valid on this platform")
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// errNameConflict is a typed error returned on create when a volume exists with the given name, but for a different driver
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errNameConflict = errors.New("conflict: volume name must be unique")
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)
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// OpErr is the error type returned by functions in the store package. It describes
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// the operation, volume name, and error.
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type OpErr struct {
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// Err is the error that occurred during the operation.
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Err error
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// Op is the operation which caused the error, such as "create", or "list".
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Op string
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// Name is the name of the resource being requested for this op, typically the volume name or the driver name.
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Name string
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// Refs is the list of references associated with the resource.
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Refs []string
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}
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// Error satisfies the built-in error interface type.
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func (e *OpErr) Error() string {
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if e == nil {
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return "<nil>"
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}
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s := e.Op
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if e.Name != "" {
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s = s + " " + e.Name
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}
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s = s + ": " + e.Err.Error()
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if len(e.Refs) > 0 {
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s = s + " - " + "[" + strings.Join(e.Refs, ", ") + "]"
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}
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return s
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}
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// IsInUse returns a boolean indicating whether the error indicates that a
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// volume is in use
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func IsInUse(err error) bool {
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return isErr(err, errVolumeInUse)
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}
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// IsNotExist returns a boolean indicating whether the error indicates that the volume does not exist
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func IsNotExist(err error) bool {
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return isErr(err, errNoSuchVolume)
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}
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// IsNameConflict returns a boolean indicating whether the error indicates that a
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// volume name is already taken
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func IsNameConflict(err error) bool {
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return isErr(err, errNameConflict)
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}
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func isErr(err error, expected error) bool {
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switch pe := err.(type) {
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case nil:
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return false
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case *OpErr:
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err = pe.Err
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}
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return err == expected
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}
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