support boot2docker via environment variables

images.go

@@ -8,6 +8,7 @@ import (
 	"fmt"
 	"io/ioutil"
 	"os"
+	"path"
 	"strings"
 )
 
@@ -53,9 +54,25 @@ func (x *ImagesCommand) Execute(args []string) error {
 	} else {
 
 		// grab directly from docker daemon
-		client, err := docker.NewClient("unix:///var/run/docker.sock")
-		if err != nil {
-			return err
+		endpoint := os.Getenv("DOCKER_HOST")
+		if len(endpoint) == 0 {
+			endpoint = "unix:///var/run/docker.sock"
+		}
+
+		var client *docker.Client
+		if dockerCertPath := os.Getenv("DOCKER_CERT_PATH"); len(dockerCertPath) > 0 {
+			cert := path.Join(dockerCertPath, "cert.pem")
+			key := path.Join(dockerCertPath, "key.pem")
+			ca := path.Join(dockerCertPath, "ca.pem")
+			client, err = docker.NewTLSClient(endpoint, cert, key, ca)
+			if err != nil {
+				return err
+			}
+		} else {
+			client, err = docker.NewClient(endpoint)
+			if err != nil {
+				return err
+			}
 		}
 
 		clientImages, err := client.ListImages(docker.ListImagesOptions{All: true})