test: new option to control load from artifacts

add a new env variable NO_TEST_ARTIFACTS to control whether images are
preloaded from the saved artifacts or pulled from the registry.

Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>

test/e2e/common_test.go

@@ -416,9 +416,13 @@ func (p *PodmanTestIntegration) pullImage(image string) {
 	}
 }
 
+func canSaveLoadArtifacts() bool {
+	return os.Getenv("NO_TEST_ARTIFACTS") == ""
+}
+
 // createArtifact creates a cached image tarball in a local directory
 func (p *PodmanTestIntegration) createArtifact(image string) {
-	if os.Getenv("NO_TEST_CACHE") != "" {
+	if os.Getenv("NO_TEST_CACHE") != "" || !canSaveLoadArtifacts() {
 		return
 	}
 	destName := imageTarPath(image)
@@ -1041,8 +1045,12 @@ func (p *PodmanTestIntegration) RestoreArtifactToCache(image string) error {
 
 func populateCache(podman *PodmanTestIntegration) {
 	for _, image := range CACHE_IMAGES {
-		err := podman.RestoreArtifactToCache(image)
-		Expect(err).ToNot(HaveOccurred())
+		if canSaveLoadArtifacts() {
+			err := podman.RestoreArtifactToCache(image)
+			Expect(err).ToNot(HaveOccurred())
+		} else {
+			podman.pullImage(image)
+		}
 	}
 	// logformatter uses this to recognize the first test
 	GinkgoWriter.Printf("-----------------------------\n")