tests: k8s-policy-deployment: add bad UID test

Change pod runAsUser value of a Deployment after generating the
Deployment's policy, and verify that the Deployment fails due to
this change.

Signed-off-by: Dan Mihai <dmihai@microsoft.com>

tests/integration/kubernetes/k8s-policy-deployment.bats

@@ -14,17 +14,24 @@ setup() {
     get_pod_config_dir
 
     deployment_name="policy-redis-deployment"
-    deployment_yaml="${pod_config_dir}/k8s-policy-deployment.yaml"
+    correct_deployment_yaml="${pod_config_dir}/k8s-policy-deployment.yaml"
 
+    # Save some time by executing genpolicy a single time.
+    if [ "${BATS_TEST_NUMBER}" == "1" ]; then
         # Add an appropriate policy to the correct YAML file.
         policy_settings_dir="$(create_tmp_policy_settings_dir "${pod_config_dir}")"
         add_requests_to_policy_settings "${policy_settings_dir}" "ReadStreamRequest"
-    auto_generate_policy "${policy_settings_dir}" "${deployment_yaml}"
+        auto_generate_policy "${policy_settings_dir}" "${correct_deployment_yaml}"
+    fi
+
+    # Start each test case with a copy of the correct yaml file.
+    incorrect_deployment_yaml="${pod_config_dir}/k8s-policy-deployment-incorrect.yaml"
+    cp "${correct_deployment_yaml}" "${incorrect_deployment_yaml}"
 }
 
 @test "Successful deployment with auto-generated policy and container image volumes" {
     # Initiate deployment
-    kubectl apply -f "${deployment_yaml}"
+    kubectl apply -f "${correct_deployment_yaml}"
 
     # Wait for the deployment to be created
     cmd="kubectl rollout status --timeout=1s deployment/${deployment_name} | grep 'successfully rolled out'"
@@ -32,16 +39,41 @@ setup() {
     waitForProcess "${wait_time}" "${sleep_time}" "${cmd}"
 }
 
+test_deployment_policy_error() {
+    # Initiate deployment
+    kubectl apply -f "${incorrect_deployment_yaml}"
+
+    # Wait for the deployment pod to fail
+    wait_for_blocked_request "CreateContainerRequest" "${deployment_name}"
+}
+
+@test "Policy failure: unexpected UID = 0" {
+    # Change the pod UID to 0 after the policy has been generated using a different
+    # runAsUser value. The policy would use UID = 0 by default, if there weren't
+    # a different runAsUser value in the YAML file.
+    yq -i \
+        '.spec.template.spec.securityContext.runAsUser = 0' \
+        "${incorrect_deployment_yaml}"
+
+    test_deployment_policy_error
+}
+
 teardown() {
     auto_generate_policy_enabled || skip "Auto-generated policy tests are disabled."
 
-    # Debugging information
+    # Pod debugging information. Don't print the "Message:" line because it contains a truncated policy log.
+    info "Pod ${deployment_name}:"
+    kubectl describe pod "${deployment_name}" | grep -v "Message:"
+
+    # Deployment debugging information. The --watch=false argument makes "kubectl rollout status"
+    # return instead of waiting for a possibly failed deployment to complete.
     info "Deployment ${deployment_name}:"
     kubectl describe deployment "${deployment_name}"
-    kubectl rollout status deployment/${deployment_name}
+    kubectl rollout status deployment/${deployment_name} --watch=false
 
     # Clean-up
     kubectl delete deployment "${deployment_name}"
 
     delete_tmp_policy_settings_dir "${policy_settings_dir}"
+    rm -f "${incorrect_deployment_yaml}"
 }

tests/integration/kubernetes/runtimeclass_workloads/k8s-policy-deployment.yaml

@@ -25,6 +25,8 @@ spec:
     spec:
       terminationGracePeriodSeconds: 0
       runtimeClassName: kata
+      securityContext:
+        runAsUser: 1000
       containers:
       - name: master
         image: quay.io/opstree/redis