Provider Docker: (#6376)

- Add option keep_locally
- Add unit test
- Add documentation

resource_docker_image.go

@@ -26,6 +26,11 @@ func resourceDockerImage() *schema.Resource {
 				Type:     schema.TypeString,
 				Computed: true,
 			},
+
+			"keep_locally": &schema.Schema{
+				Type:     schema.TypeBool,
+				Optional: true,
+			},
 		},
 	}
 }

resource_docker_image_funcs.go

@@ -63,6 +63,11 @@ func searchLocalImages(data Data, imageName string) *dc.APIImages {
 
 func removeImage(d *schema.ResourceData, client *dc.Client) error {
 	var data Data
+
+	if keepLocally := d.Get("keep_locally").(bool); keepLocally {
+		return nil
+	}
+
 	if err := fetchLocalImages(&data, client); err != nil {
 		return err
 	}

resource_docker_image_test.go

@@ -44,9 +44,36 @@ func TestAccDockerImage_private(t *testing.T) {
 	})
 }
 
-func testAccDockerImageDestroy(s *terraform.State) error {
-	//client := testAccProvider.Meta().(*dc.Client)
+func TestAccDockerImage_destroy(t *testing.T) {
+	resource.Test(t, resource.TestCase{
+		PreCheck:  func() { testAccPreCheck(t) },
+		Providers: testAccProviders,
+		CheckDestroy: func(s *terraform.State) error {
+			for _, rs := range s.RootModule().Resources {
+				if rs.Type != "docker_image" {
+					continue
+				}
 
+				client := testAccProvider.Meta().(*dc.Client)
+				_, err := client.InspectImage(rs.Primary.Attributes["latest"])
+				if err != nil {
+					return err
+				}
+			}
+			return nil
+		},
+		Steps: []resource.TestStep{
+			resource.TestStep{
+				Config: testAccDockerImageKeepLocallyConfig,
+				Check: resource.ComposeTestCheckFunc(
+					resource.TestMatchResourceAttr("docker_image.foobarzoo", "latest", contentDigestRegexp),
+				),
+			},
+		},
+	})
+}
+
+func testAccDockerImageDestroy(s *terraform.State) error {
 	for _, rs := range s.RootModule().Resources {
 		if rs.Type != "docker_image" {
 			continue
@@ -76,3 +103,10 @@ resource "docker_image" "foobar" {
 	keep_updated = true
 }
 `
+
+const testAccDockerImageKeepLocallyConfig = `
+resource "docker_image" "foobarzoo" {
+	name = "crux:3.1"
+	keep_locally = true
+}
+`