feat: add force_remove option to r/image (#104)

docker/resource_docker_image.go

@@ -51,6 +51,12 @@ func resourceDockerImage() *schema.Resource {
 				},
 			},
 
+			"force_remove": {
+				Type:        schema.TypeBool,
+				Description: "Force remove the image when the resource is destroyed",
+				Optional:    true,
+			},
+
 			"build": {
 				Type:          schema.TypeSet,
 				Optional:      true,

docker/resource_docker_image_funcs.go

@@ -152,7 +152,9 @@ func removeImage(d *schema.ResourceData, client *client.Client) error {
 	foundImage := searchLocalImages(data, imageName)
 
 	if foundImage != nil {
-		imageDeleteResponseItems, err := client.ImageRemove(context.Background(), foundImage.ID, types.ImageRemoveOptions{})
+		imageDeleteResponseItems, err := client.ImageRemove(context.Background(), imageName, types.ImageRemoveOptions{
+			Force: d.Get("force_remove").(bool),
+		})
 		if err != nil {
 			return err
 		}

docker/resource_docker_image_test.go

@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"io/ioutil"
 	"os"
+	"os/exec"
 	"path"
 	"regexp"
 	"testing"
@@ -15,7 +16,19 @@ import (
 
 var contentDigestRegexp = regexp.MustCompile(`\A[A-Za-z0-9_\+\.-]+:[A-Fa-f0-9]+\z`)
 
+const testForceRemoveDockerImageName = "alpine:3.11.5"
+
 func TestAccDockerImage_basic(t *testing.T) {
+	// run a Docker container which refers the Docker image to test "force_remove" option
+	containerName := "test-docker-image-force-remove"
+	if err := exec.Command("docker", "run", "--rm", "-d", "--name", containerName, testForceRemoveDockerImageName, "tail", "-f", "/dev/null").Run(); err != nil {
+		t.Fatal(err)
+	}
+	defer func() {
+		if err := exec.Command("docker", "stop", containerName).Run(); err != nil {
+			t.Logf("failed to stop the Docker container %s: %v", containerName, err)
+		}
+	}()
 	resource.Test(t, resource.TestCase{
 		PreCheck:     func() { testAccPreCheck(t) },
 		Providers:    testAccProviders,
@@ -27,6 +40,12 @@ func TestAccDockerImage_basic(t *testing.T) {
 					resource.TestMatchResourceAttr("docker_image.foo", "latest", contentDigestRegexp),
 				),
 			},
+			{
+				Config: testAccForceRemoveDockerImage,
+				Check: resource.ComposeTestCheckFunc(
+					resource.TestMatchResourceAttr("docker_image.test", "latest", contentDigestRegexp),
+				),
+			},
 		},
 	})
 }
@@ -58,7 +77,7 @@ func TestAccDockerImage_destroy(t *testing.T) {
 				}
 
 				client := testAccProvider.Meta().(*ProviderConfig).DockerClient
-				_, _, err := client.ImageInspectWithRaw(context.Background(), rs.Primary.Attributes["latest"])
+				_, _, err := client.ImageInspectWithRaw(context.Background(), rs.Primary.Attributes["name"])
 				if err != nil {
 					return err
 				}
@@ -195,7 +214,7 @@ func testAccDockerImageDestroy(s *terraform.State) error {
 		}
 
 		client := testAccProvider.Meta().(*ProviderConfig).DockerClient
-		_, _, err := client.ImageInspectWithRaw(context.Background(), rs.Primary.Attributes["latest"])
+		_, _, err := client.ImageInspectWithRaw(context.Background(), rs.Primary.Attributes["name"])
 		if err == nil {
 			return fmt.Errorf("Image still exists")
 		}
@@ -231,6 +250,13 @@ resource "docker_image" "foo" {
 }
 `
 
+const testAccForceRemoveDockerImage = `
+resource "docker_image" "test" {
+	name         = "` + testForceRemoveDockerImageName + `"
+	force_remove = true
+}
+`
+
 const testAddDockerPrivateImageConfig = `
 resource "docker_image" "foobar" {
 	name = "gcr.io:443/google_containers/pause:0.8.0"

website/docs/r/image.html.markdown

@@ -52,6 +52,7 @@ The following arguments are supported:
   registry when using the `docker_registry_image` [data source](/docs/providers/docker/d/registry_image.html)
   to trigger an image update.
 * `pull_trigger` - **Deprecated**, use `pull_triggers` instead.
+* `force_remove` - (Optional, boolean) If true, then the image is removed Forcely when the resource is destroyed.
 * `build` - (Optional, block) See [Build](#build-1) below for details.
 
 <a id="build-1"></a>