Add mounts to docker ps.

- Allow to filter containers by volume with `--filter volume=name` and `filter volume=/dest`.
- Show their names in the list with the custom format `{{ .Mounts }}`.

Signed-off-by: David Calavera <david.calavera@gmail.com>
Upstream-commit: bd4fb00fb6241d35537b460a2d9f48256111ae7a
Component: engine

components/engine/api/client/formatter/custom.go

@@ -31,6 +31,7 @@ const (
 	repositoryHeader   = "REPOSITORY"
 	tagHeader          = "TAG"
 	digestHeader       = "DIGEST"
+	mountsHeader       = "MOUNTS"
 )
 
 type containerContext struct {
@@ -142,6 +143,20 @@ func (c *containerContext) Label(name string) string {
 	return c.c.Labels[name]
 }
 
+func (c *containerContext) Mounts() string {
+	c.addHeader(mountsHeader)
+
+	var mounts []string
+	for _, m := range c.c.Mounts {
+		name := m.Name
+		if c.trunc {
+			name = stringutils.Truncate(name, 15)
+		}
+		mounts = append(mounts, name)
+	}
+	return strings.Join(mounts, ",")
+}
+
 type imageContext struct {
 	baseSubContext
 	trunc  bool