Add more error details on plugin get
Seeing this `ErrNotImplements` in some of our logs and it's not very
helpful because we don't know what plugin is causing it or even what the
requested interface is.
```
{"message":"legacy plugin: Plugin does not implement the requested driver"}
```
@@ -24,6 +24,7 @@ package plugins // import "github.com/docker/docker/pkg/plugins"
import (
"errors"
+ "fmt"
"sync"
"time"
@@ -265,7 +266,7 @@ func Get(name, imp string) (*Plugin, error) {
logrus.Debugf("%s implements: %s", name, imp)
return pl, nil
}
- return nil, ErrNotImplements
+ return nil, fmt.Errorf("%w: plugin=%q, requested implementation=%q", ErrNotImplements, name, imp)
}
// Handle adds the specified function to the extpointHandlers.
