e2e: use docker:dind image as default, as docker:stable-dind is EOL

The stable-dind image was stuck on Docker 19.03. Updating to "dind"
now gives us docker 20.10.

Docker 20.10 fixed an issue with the "docker pull" response previously
not including the image name of the image that was pulled. This
caused the test to fail, as the .golden file no longer matched.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

.github/workflows/e2e.yml

@@ -28,8 +28,7 @@ jobs:
           - alpine
           - bullseye
         engine-version:
-#          - 20.10-dind # FIXME: Fails on 20.10
-          - stable-dind # TODO: Use 20.10-dind, stable-dind is deprecated
+          - 20.10-dind
         include:
           - target: non-experimental
             engine-version: 19.03-dind

e2e/compose-env.yaml

@@ -5,7 +5,7 @@ services:
     image: 'registry:2'
 
   engine:
-      image: 'docker:${TEST_ENGINE_VERSION:-stable-dind}'
+      image: 'docker:${TEST_ENGINE_VERSION:-dind}'
       privileged: true
       command: ['--insecure-registry=registry:5000']
       environment:

e2e/image/pull_test.go

@@ -1,6 +1,7 @@
 package image
 
 import (
+	"strings"
 	"testing"
 
 	"github.com/docker/cli/e2e/internal/fixtures"
@@ -16,6 +17,7 @@ const registryPrefix = "registry:5000"
 
 func TestPullWithContentTrust(t *testing.T) {
 	skip.If(t, environment.RemoteDaemon())
+	skip.If(t, strings.HasPrefix(environment.DaemonVersion(), "19.03"), "skipping on 19.03 daemon, as output format differs")
 
 	dir := fixtures.SetupConfigFile(t)
 	defer dir.Remove()

e2e/image/testdata/pull-with-content-trust.golden

@@ -1,5 +1,5 @@
 Pull (1 of 1): registry:5000/trust-pull:latest@sha256:641b95ddb2ea9dc2af1a0113b6b348ebc20872ba615204fbe12148e98fd6f23d
-sha256:641b95ddb2ea9dc2af1a0113b6b348ebc20872ba615204fbe12148e98fd6f23d: Pulling from trust-pull
+registry:5000/trust-pull@sha256:641b95ddb2ea9dc2af1a0113b6b348ebc20872ba615204fbe12148e98fd6f23d: Pulling from trust-pull
 Digest: sha256:641b95ddb2ea9dc2af1a0113b6b348ebc20872ba615204fbe12148e98fd6f23d
 Status: Downloaded newer image for registry:5000/trust-pull@sha256:641b95ddb2ea9dc2af1a0113b6b348ebc20872ba615204fbe12148e98fd6f23d
 registry:5000/trust-pull:latest

internal/test/environment/testenv.go

@@ -71,6 +71,12 @@ func boolFromString(val string) bool {
 // DefaultPollSettings used with gotestyourself/poll
 var DefaultPollSettings = poll.WithDelay(100 * time.Millisecond)
 
+// DaemonVersion returns the version of the daemon
+func DaemonVersion() string {
+	result := icmd.RunCmd(icmd.Command("docker", "info", "--format", "{{.ServerVersion}}"))
+	return strings.TrimSpace(result.Stdout())
+}
+
 // SkipIfNotExperimentalDaemon returns whether the test docker daemon is in experimental mode
 func SkipIfNotExperimentalDaemon(t *testing.T) {
 	t.Helper()