Add integration test for volume plugins on swarm

Signed-off-by: Aaron Lehmann <aaron.lehmann@docker.com>

integration-cli/docker_cli_swarm_unix_test.go

@@ -0,0 +1,52 @@
+// +build !windows
+
+package main
+
+import (
+	"encoding/json"
+	"strings"
+
+	"github.com/docker/docker/api/types/swarm"
+	"github.com/docker/docker/pkg/integration/checker"
+	"github.com/go-check/check"
+)
+
+func (s *DockerSwarmSuite) TestSwarmVolumePlugin(c *check.C) {
+	d := s.AddDaemon(c, true, true)
+
+	out, err := d.Cmd("service", "create", "--mount", "type=volume,source=my-volume,destination=/foo,volume-driver=customvolumedriver", "--name", "top", "busybox", "top")
+	c.Assert(err, checker.IsNil, check.Commentf(out))
+
+	// Make sure task stays pending before plugin is available
+	waitAndAssert(c, defaultReconciliationTimeout, d.CheckServiceTasksInState("top", swarm.TaskStatePending, "missing plugin on 1 node"), checker.Equals, 1)
+
+	plugin := newVolumePlugin(c, "customvolumedriver")
+	defer plugin.Close()
+
+	// create a dummy volume to trigger lazy loading of the plugin
+	out, err = d.Cmd("volume", "create", "-d", "customvolumedriver", "hello")
+
+	// TODO(aaronl): It will take about 15 seconds for swarm to realize the
+	// plugin was loaded. Switching the test over to plugin v2 would avoid
+	// this long delay.
+
+	// make sure task has been deployed.
+	waitAndAssert(c, defaultReconciliationTimeout, d.CheckActiveContainerCount, checker.Equals, 1)
+
+	out, err = d.Cmd("ps", "-q")
+	c.Assert(err, checker.IsNil)
+	containerID := strings.TrimSpace(out)
+
+	out, err = d.Cmd("inspect", "-f", "{{json .Mounts}}", containerID)
+	c.Assert(err, checker.IsNil)
+
+	var mounts []struct {
+		Name   string
+		Driver string
+	}
+
+	c.Assert(json.NewDecoder(strings.NewReader(out)).Decode(&mounts), checker.IsNil)
+	c.Assert(len(mounts), checker.Equals, 1, check.Commentf(out))
+	c.Assert(mounts[0].Name, checker.Equals, "my-volume")
+	c.Assert(mounts[0].Driver, checker.Equals, "customvolumedriver")
+}