Add API for communicating with Docker volume plugins

Docker provides extensibility through a plugin system, of which
several types are available. This provides an initial library API
for communicating with one type of plugins, volume plugins.
Volume plugins allow for an external service to create and manage
a volume on Podman's behalf.

This does not integrate the plugin system into Libpod or Podman
yet; that will come in subsequent pull requests.

Signed-off-by: Matthew Heon <mheon@redhat.com>

1 files changed, 10 insertions, 3 deletions

diff --git a/libpod/options.go b/libpod/options.go
index 0f55f34a3..bd12c0c34 100644
--- a/libpod/options.go
+++ b/libpod/options.go
@@ -1547,12 +1547,19 @@ func WithVolumeDriver(driver string) VolumeCreateOption {
 		if volume.valid {
 			return define.ErrVolumeFinalized
 		}
-		// only local driver is possible rn
+
+		// Uncomment when volume plugins are ready for use.
+		// if driver != define.VolumeDriverLocal {
+		// 	if _, err := plugin.GetVolumePlugin(driver); err != nil {
+		// 		return err
+		// 	}
+		// }
+
 		if driver != define.VolumeDriverLocal {
 			return define.ErrNotImplemented
-
 		}
-		volume.config.Driver = define.VolumeDriverLocal
+
+		volume.config.Driver = driver
 		return nil
 	}
 }