dockerutil pkg to manage docker api client and context

Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>

util/dockerutil/api.go

@@ -0,0 +1,45 @@
+package dockerutil
+
+import (
+	"github.com/docker/cli/cli/command"
+	"github.com/docker/cli/cli/context/docker"
+	"github.com/docker/docker/client"
+)
+
+// ClientAPI represents an active docker API object.
+type ClientAPI struct {
+	client.APIClient
+}
+
+func NewClientAPI(cli command.Cli, ep string) (*ClientAPI, error) {
+	ca := &ClientAPI{}
+
+	var dep docker.Endpoint
+	dem, err := GetDockerEndpoint(cli, ep)
+	if err != nil {
+		return nil, err
+	} else if dem != nil {
+		dep, err = docker.WithTLSData(cli.ContextStore(), ep, *dem)
+		if err != nil {
+			return nil, err
+		}
+	} else {
+		dep = docker.Endpoint{
+			EndpointMeta: docker.EndpointMeta{
+				Host: ep,
+			},
+		}
+	}
+
+	clientOpts, err := dep.ClientOpts()
+	if err != nil {
+		return nil, err
+	}
+
+	ca.APIClient, err = client.NewClientWithOpts(clientOpts...)
+	if err != nil {
+		return nil, err
+	}
+
+	return ca, nil
+}