Impose order on test scripts.

The simple test script has gotten out of control. Shard this script into
different pieces and attempt to impose order on overall test structure. This
change helps lay some of the foundations for future improvements.

 * The runsc/test directories are moved into just test/.
 * The runsc/test/testutil package is split into logical pieces.
 * The scripts/ directory contains new top-level targets.
 * Each test is now responsible for building targets it requires.
 * The install functionality is moved into `runsc` itself for simplicity.
 * The existing kokoro run_tests.sh file now just calls all (can be split).

After this change is merged,  I will create multiple distinct workflows for
Kokoro, one for each of the scripts currently targeted by `run_tests.sh` today,
which should dramatically reduce the time-to-run for the Kokoro tests, and
provides a better foundation for further improvements to the infrastructure.

PiperOrigin-RevId: 267081397

2 files changed, 258 insertions, 0 deletions

diff --git a/runsc/criutil/BUILD b/runsc/criutil/BUILD
new file mode 100644
index 000000000..558133a0e
--- /dev/null
+++ b/runsc/criutil/BUILD
@@ -0,0 +1,12 @@
+load("@io_bazel_rules_go//go:def.bzl", "go_library")
+
+package(licenses = ["notice"])
+
+go_library(
+    name = "criutil",
+    testonly = 1,
+    srcs = ["criutil.go"],
+    importpath = "gvisor.dev/gvisor/runsc/criutil",
+    visibility = ["//:sandbox"],
+    deps = ["//runsc/testutil"],
+)
diff --git a/runsc/criutil/criutil.go b/runsc/criutil/criutil.go
new file mode 100644
index 000000000..c8ddf5a9a
--- /dev/null
+++ b/runsc/criutil/criutil.go
@@ -0,0 +1,246 @@
+// Copyright 2018 The gVisor Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Package criutil contains utility functions for interacting with the
+// Container Runtime Interface (CRI), principally via the crictl command line
+// tool. This requires critools to be installed on the local system.
+package criutil
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+	"os/exec"
+	"strings"
+	"time"
+
+	"gvisor.dev/gvisor/runsc/testutil"
+)
+
+const endpointPrefix = "unix://"
+
+// Crictl contains information required to run the crictl utility.
+type Crictl struct {
+	executable      string
+	timeout         time.Duration
+	imageEndpoint   string
+	runtimeEndpoint string
+}
+
+// NewCrictl returns a Crictl configured with a timeout and an endpoint over
+// which it will talk to containerd.
+func NewCrictl(timeout time.Duration, endpoint string) *Crictl {
+	// Bazel doesn't pass PATH through, assume the location of crictl
+	// unless specified by environment variable.
+	executable := os.Getenv("CRICTL_PATH")
+	if executable == "" {
+		executable = "/usr/local/bin/crictl"
+	}
+	return &Crictl{
+		executable:      executable,
+		timeout:         timeout,
+		imageEndpoint:   endpointPrefix + endpoint,
+		runtimeEndpoint: endpointPrefix + endpoint,
+	}
+}
+
+// Pull pulls an container image. It corresponds to `crictl pull`.
+func (cc *Crictl) Pull(imageName string) error {
+	_, err := cc.run("pull", imageName)
+	return err
+}
+
+// RunPod creates a sandbox. It corresponds to `crictl runp`.
+func (cc *Crictl) RunPod(sbSpecFile string) (string, error) {
+	podID, err := cc.run("runp", sbSpecFile)
+	if err != nil {
+		return "", fmt.Errorf("runp failed: %v", err)
+	}
+	// Strip the trailing newline from crictl output.
+	return strings.TrimSpace(podID), nil
+}
+
+// Create creates a container within a sandbox. It corresponds to `crictl
+// create`.
+func (cc *Crictl) Create(podID, contSpecFile, sbSpecFile string) (string, error) {
+	podID, err := cc.run("create", podID, contSpecFile, sbSpecFile)
+	if err != nil {
+		return "", fmt.Errorf("create failed: %v", err)
+	}
+	// Strip the trailing newline from crictl output.
+	return strings.TrimSpace(podID), nil
+}
+
+// Start starts a container. It corresponds to `crictl start`.
+func (cc *Crictl) Start(contID string) (string, error) {
+	output, err := cc.run("start", contID)
+	if err != nil {
+		return "", fmt.Errorf("start failed: %v", err)
+	}
+	return output, nil
+}
+
+// Stop stops a container. It corresponds to `crictl stop`.
+func (cc *Crictl) Stop(contID string) error {
+	_, err := cc.run("stop", contID)
+	return err
+}
+
+// Exec execs a program inside a container. It corresponds to `crictl exec`.
+func (cc *Crictl) Exec(contID string, args ...string) (string, error) {
+	a := []string{"exec", contID}
+	a = append(a, args...)
+	output, err := cc.run(a...)
+	if err != nil {
+		return "", fmt.Errorf("exec failed: %v", err)
+	}
+	return output, nil
+}
+
+// Rm removes a container. It corresponds to `crictl rm`.
+func (cc *Crictl) Rm(contID string) error {
+	_, err := cc.run("rm", contID)
+	return err
+}
+
+// StopPod stops a pod. It corresponds to `crictl stopp`.
+func (cc *Crictl) StopPod(podID string) error {
+	_, err := cc.run("stopp", podID)
+	return err
+}
+
+// containsConfig is a minimal copy of
+// https://github.com/kubernetes/kubernetes/blob/master/pkg/kubelet/apis/cri/runtime/v1alpha2/api.proto
+// It only contains fields needed for testing.
+type containerConfig struct {
+	Status containerStatus
+}
+
+type containerStatus struct {
+	Network containerNetwork
+}
+
+type containerNetwork struct {
+	IP string
+}
+
+// PodIP returns a pod's IP address.
+func (cc *Crictl) PodIP(podID string) (string, error) {
+	output, err := cc.run("inspectp", podID)
+	if err != nil {
+		return "", err
+	}
+	conf := &containerConfig{}
+	if err := json.Unmarshal([]byte(output), conf); err != nil {
+		return "", fmt.Errorf("failed to unmarshal JSON: %v, %s", err, output)
+	}
+	if conf.Status.Network.IP == "" {
+		return "", fmt.Errorf("no IP found in config: %s", output)
+	}
+	return conf.Status.Network.IP, nil
+}
+
+// RmPod removes a container. It corresponds to `crictl rmp`.
+func (cc *Crictl) RmPod(podID string) error {
+	_, err := cc.run("rmp", podID)
+	return err
+}
+
+// StartPodAndContainer pulls an image, then starts a sandbox and container in
+// that sandbox. It returns the pod ID and container ID.
+func (cc *Crictl) StartPodAndContainer(image, sbSpec, contSpec string) (string, string, error) {
+	if err := cc.Pull(image); err != nil {
+		return "", "", fmt.Errorf("failed to pull %s: %v", image, err)
+	}
+
+	// Write the specs to files that can be read by crictl.
+	sbSpecFile, err := testutil.WriteTmpFile("sbSpec", sbSpec)
+	if err != nil {
+		return "", "", fmt.Errorf("failed to write sandbox spec: %v", err)
+	}
+	contSpecFile, err := testutil.WriteTmpFile("contSpec", contSpec)
+	if err != nil {
+		return "", "", fmt.Errorf("failed to write container spec: %v", err)
+	}
+
+	podID, err := cc.RunPod(sbSpecFile)
+	if err != nil {
+		return "", "", err
+	}
+
+	contID, err := cc.Create(podID, contSpecFile, sbSpecFile)
+	if err != nil {
+		return "", "", fmt.Errorf("failed to create container in pod %q: %v", podID, err)
+	}
+
+	if _, err := cc.Start(contID); err != nil {
+		return "", "", fmt.Errorf("failed to start container %q in pod %q: %v", contID, podID, err)
+	}
+
+	return podID, contID, nil
+}
+
+// StopPodAndContainer stops a container and pod.
+func (cc *Crictl) StopPodAndContainer(podID, contID string) error {
+	if err := cc.Stop(contID); err != nil {
+		return fmt.Errorf("failed to stop container %q in pod %q: %v", contID, podID, err)
+	}
+
+	if err := cc.Rm(contID); err != nil {
+		return fmt.Errorf("failed to remove container %q in pod %q: %v", contID, podID, err)
+	}
+
+	if err := cc.StopPod(podID); err != nil {
+		return fmt.Errorf("failed to stop pod %q: %v", podID, err)
+	}
+
+	if err := cc.RmPod(podID); err != nil {
+		return fmt.Errorf("failed to remove pod %q: %v", podID, err)
+	}
+
+	return nil
+}
+
+// run runs crictl with the given args and returns an error if it takes longer
+// than cc.Timeout to run.
+func (cc *Crictl) run(args ...string) (string, error) {
+	defaultArgs := []string{
+		"--image-endpoint", cc.imageEndpoint,
+		"--runtime-endpoint", cc.runtimeEndpoint,
+	}
+	cmd := exec.Command(cc.executable, append(defaultArgs, args...)...)
+
+	// Run the command with a timeout.
+	done := make(chan string)
+	errCh := make(chan error)
+	go func() {
+		output, err := cmd.CombinedOutput()
+		if err != nil {
+			errCh <- fmt.Errorf("error: \"%v\", output: %s", err, string(output))
+			return
+		}
+		done <- string(output)
+	}()
+	select {
+	case output := <-done:
+		return output, nil
+	case err := <-errCh:
+		return "", err
+	case <-time.After(cc.timeout):
+		if err := testutil.KillCommand(cmd); err != nil {
+			return "", fmt.Errorf("timed out, then couldn't kill process %+v: %v", cmd, err)
+		}
+		return "", fmt.Errorf("timed out: %+v", cmd)
+	}
+}