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// Copyright 2018 Google Inc.
//
// 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 testutil
import (
"fmt"
"io/ioutil"
"log"
"math/rand"
"net/http"
"os"
"os/exec"
"path"
"regexp"
"strconv"
"strings"
"time"
)
func init() {
rand.Seed(time.Now().UnixNano())
}
func runtime() string {
r := os.Getenv("RUNSC_RUNTIME")
if r == "" {
return "runsc-test"
}
return r
}
// EnsureSupportedDockerVersion checks if correct docker is installed.
func EnsureSupportedDockerVersion() {
cmd := exec.Command("docker", "version")
out, err := cmd.CombinedOutput()
if err != nil {
log.Fatalf("Error running %q: %v", "docker version", err)
}
re := regexp.MustCompile(`Version:\s+(\d+)\.(\d+)\.\d.*`)
matches := re.FindStringSubmatch(string(out))
if len(matches) != 3 {
log.Fatalf("Invalid docker output: %s", out)
}
major, _ := strconv.Atoi(matches[1])
minor, _ := strconv.Atoi(matches[2])
if major < 17 || (major == 17 && minor < 9) {
log.Fatalf("Docker version 17.09.0 or greater is required, found: %02d.%02d", major, minor)
}
}
// MountArg formats the volume argument to mount in the container.
func MountArg(source, target string) string {
return fmt.Sprintf("%s:%s", source, target)
}
// LinkArg formats the link argument.
func LinkArg(source *Docker, target string) string {
return fmt.Sprintf("%s:%s", source.Name, target)
}
// PrepareFiles creates temp directory to copy files there. The sandbox doesn't
// have access to files in the test dir.
func PrepareFiles(names ...string) (string, error) {
dir, err := ioutil.TempDir("", "image-test")
if err != nil {
return "", fmt.Errorf("ioutil.TempDir failed: %v", err)
}
if err := os.Chmod(dir, 0777); err != nil {
return "", fmt.Errorf("os.Chmod(%q, 0777) failed: %v", dir, err)
}
for _, name := range names {
src := getLocalPath(name)
dst := path.Join(dir, name)
if err := Copy(src, dst); err != nil {
return "", fmt.Errorf("testutil.Copy(%q, %q) failed: %v", src, dst, err)
}
}
return dir, nil
}
func getLocalPath(file string) string {
return path.Join(".", file)
}
// do executes docker command.
func do(args ...string) (string, error) {
fmt.Printf("Running: docker %s\n", args)
cmd := exec.Command("docker", args...)
out, err := cmd.CombinedOutput()
if err != nil {
return "", fmt.Errorf("error executing docker %s: %v", args, err)
}
return string(out), nil
}
// Pull pulls a docker image. This is used in tests to isolate the
// time to pull the image off the network from the time to actually
// start the container, to avoid timeouts over slow networks.
func Pull(image string) (string, error) {
return do("pull", image)
}
// Docker contains the name and the runtime of a docker container.
type Docker struct {
Runtime string
Name string
}
// MakeDocker sets up the struct for a Docker container.
// Names of containers will be unique.
func MakeDocker(namePrefix string) Docker {
suffix := fmt.Sprintf("-%06d", rand.Int())[:7]
return Docker{Name: namePrefix + suffix, Runtime: runtime()}
}
// Run calls 'docker run' with the arguments provided.
func (d *Docker) Run(args ...string) (string, error) {
a := []string{"run", "--runtime", d.Runtime, "--name", d.Name, "-d"}
a = append(a, args...)
return do(a...)
}
// CleanUp kills and deletes the container.
func (d *Docker) CleanUp() error {
if _, err := do("kill", d.Name); err != nil {
return fmt.Errorf("error killing container %q: %v", d.Name, err)
}
if _, err := do("rm", d.Name); err != nil {
return fmt.Errorf("error deleting container %q: %v", d.Name, err)
}
return nil
}
// FindPort returns the host port that is mapped to 'sandboxPort'. This calls
// docker to allocate a free port in the host and prevent conflicts.
func (d *Docker) FindPort(sandboxPort int) (int, error) {
format := fmt.Sprintf(`{{ (index (index .NetworkSettings.Ports "%d/tcp") 0).HostPort }}`, sandboxPort)
out, err := do("inspect", "-f", format, d.Name)
if err != nil {
return -1, fmt.Errorf("error retrieving port: %v", err)
}
port, err := strconv.Atoi(strings.TrimSuffix(string(out), "\n"))
if err != nil {
return -1, fmt.Errorf("error parsing port %q: %v", out, err)
}
return port, nil
}
// WaitForOutput calls 'docker logs' to retrieve containers output and searches
// for the given pattern.
func (d *Docker) WaitForOutput(pattern string, timeout time.Duration) error {
re := regexp.MustCompile(pattern)
var out string
for exp := time.Now().Add(timeout); time.Now().Before(exp); {
var err error
out, err = do("logs", d.Name)
if err != nil {
return err
}
if re.MatchString(out) {
// Success!
return nil
}
time.Sleep(100 * time.Millisecond)
}
return fmt.Errorf("timeout waiting for output %q: %s", re.String(), out)
}
// WaitForHTTP tries GET requests on a port until the call succeeds or a timeout.
func (d *Docker) WaitForHTTP(port int, timeout time.Duration) error {
for exp := time.Now().Add(timeout); time.Now().Before(exp); {
url := fmt.Sprintf("http://localhost:%d/", port)
if _, err := http.Get(url); err == nil {
// Success!
return nil
}
time.Sleep(100 * time.Millisecond)
}
return fmt.Errorf("timeout waiting for HTTP server on port %d", port)
}
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