pkg: validate: validate Username not empty in ImageStatus

Kubernetes rely on that Username field to provide RunAsUser, we need to
validate runtimes correctly return it. We had recently an issue in
CRI-O for that.

Signed-off-by: Antonio Murdaca <[email protected]>

pkg/validate/image.go

@@ -70,6 +70,18 @@ var _ = framework.KubeDescribe("Image Manager", func() {
 		Expect(status.Size_).NotTo(BeNil(), "Image Size should not be nil")
 	})
 
+	It("image status get image fields should not have Username empty [Conformance]", func() {
+		// runcom/testnginx has been built with a dockerfile having USER 1002
+		// we test that that user is returned in image status
+		framework.PullPublicImage(c, "runcom/testnginx")
+
+		defer removeImage(c, "runcom/testnginx")
+
+		status := framework.ImageStatus(c, testImageRef)
+		Expect(status.Username).NotTo(BeNil(), "Image Username should not be empty")
+		Expect(status.Username).To(Equal("1002"), "Image Username should be 1002")
+	})
+
 	It("listImage should get exactly 3 image in the result list [Conformance]", func() {
 		// different tags refer to different images
 		testImageList := []string{