feat: support to import an image with image name

internal/provider/resource_docker_image.go

@@ -1,6 +1,8 @@
 package provider
 
 import (
+	"context"
+
 	"github.com/hashicorp/terraform-plugin-sdk/v2/helper/schema"
 )
 
@@ -10,6 +12,12 @@ func resourceDockerImage() *schema.Resource {
 		ReadContext:   resourceDockerImageRead,
 		UpdateContext: resourceDockerImageUpdate,
 		DeleteContext: resourceDockerImageDelete,
+		Importer: &schema.ResourceImporter{
+			StateContext: func(_ context.Context, d *schema.ResourceData, m interface{}) ([]*schema.ResourceData, error) {
+				d.Set("name", d.Id())
+				return []*schema.ResourceData{d}, nil
+			},
+		},
 
 		Schema: map[string]*schema.Schema{
 			"name": {

internal/provider/resource_docker_image_funcs.go

@@ -67,12 +67,11 @@ func resourceDockerImageCreate(ctx context.Context, d *schema.ResourceData, meta
 			}
 		}
 	}
-	apiImage, err := findImage(ctx, imageName, client, meta.(*ProviderConfig).AuthConfigs)
-	if err != nil {
+	if _, err := findImage(ctx, imageName, client, meta.(*ProviderConfig).AuthConfigs); err != nil {
 		return diag.Errorf("Unable to read Docker image into resource: %s", err)
 	}
 
-	d.SetId(apiImage.ID + d.Get("name").(string))
+	d.SetId(imageName)
 	return resourceDockerImageRead(ctx, d, meta)
 }
 
@@ -94,7 +93,7 @@ func resourceDockerImageRead(ctx context.Context, d *schema.ResourceData, meta i
 		return nil
 	}
 
-	d.SetId(foundImage.ID + d.Get("name").(string))
+	d.SetId(imageName)
 	d.Set("latest", foundImage.ID)
 	return nil
 }

website/docs/r/image.html.markdown

@@ -98,3 +98,11 @@ The `build` block supports:
 The following attributes are exported in addition to the above configuration:
 
 * `latest` (string) - The ID of the image.
+
+## Import
+
+Docker images can be imported using image name, e.g. for an image named `alpine:3.13.0`:
+
+```sh
+$ terraform import docker_image.alpine alpine:3.13.0
+```