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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 contains utility functions for runsc tests.
package testutil
import (
"context"
"encoding/json"
"fmt"
"io"
"io/ioutil"
"net/http"
"os"
"path/filepath"
"time"
"github.com/cenkalti/backoff"
specs "github.com/opencontainers/runtime-spec/specs-go"
"gvisor.googlesource.com/gvisor/runsc/boot"
"gvisor.googlesource.com/gvisor/runsc/specutils"
)
// RaceEnabled is set to true if it was built with '--race' option.
var RaceEnabled = false
// ConfigureExePath configures the executable for runsc in the test environment.
func ConfigureExePath() error {
// runsc is in a directory like: 'runsc/linux_amd64_pure_stripped/runsc'.
// Since I don't want to construct 'linux_amd64_pure_stripped' based on the
// build type, do a quick search for: 'runsc/*/runsc'
exePath := ""
lv1 := "./runsc"
lv1fis, err := ioutil.ReadDir(lv1)
if err != nil {
return err
}
for _, fi := range lv1fis {
if !fi.IsDir() {
continue
}
lv2fis, err := ioutil.ReadDir(filepath.Join(lv1, fi.Name()))
if err != nil {
return err
}
for _, candidate := range lv2fis {
if !candidate.IsDir() && candidate.Name() == "runsc" {
exePath, err = filepath.Abs(filepath.Join(lv1, fi.Name(), candidate.Name()))
if err != nil {
return err
}
break
}
}
}
if exePath == "" {
return fmt.Errorf("path to runsc not found")
}
specutils.ExePath = exePath
return nil
}
// TestConfig return the default configuration to use in tests.
func TestConfig() *boot.Config {
return &boot.Config{
Debug: true,
LogFormat: "text",
LogPackets: true,
Network: boot.NetworkNone,
Strace: true,
MultiContainer: true,
FileAccess: boot.FileAccessProxyExclusive,
}
}
// NewSpecWithArgs creates a simple spec with the given args suitable for use
// in tests.
func NewSpecWithArgs(args ...string) *specs.Spec {
spec := &specs.Spec{
// The host filesystem root is the container root.
Root: &specs.Root{
Path: "/",
Readonly: true,
},
Process: &specs.Process{
Args: args,
Env: []string{
"PATH=" + os.Getenv("PATH"),
},
},
}
return spec
}
// SetupRootDir creates a root directory for containers.
func SetupRootDir() (string, error) {
rootDir, err := ioutil.TempDir("", "containers")
if err != nil {
return "", fmt.Errorf("error creating root dir: %v", err)
}
return rootDir, nil
}
// SetupContainer creates a bundle and root dir for the container, generates a
// test config, and writes the spec to config.json in the bundle dir.
func SetupContainer(spec *specs.Spec, conf *boot.Config) (rootDir, bundleDir string, err error) {
rootDir, err = SetupRootDir()
if err != nil {
return "", "", err
}
bundleDir, err = SetupContainerInRoot(rootDir, spec, conf)
return rootDir, bundleDir, err
}
// SetupContainerInRoot creates a bundle for the container, generates a test
// config, and writes the spec to config.json in the bundle dir.
func SetupContainerInRoot(rootDir string, spec *specs.Spec, conf *boot.Config) (bundleDir string, err error) {
bundleDir, err = ioutil.TempDir("", "bundle")
if err != nil {
return "", fmt.Errorf("error creating bundle dir: %v", err)
}
if err = writeSpec(bundleDir, spec); err != nil {
return "", fmt.Errorf("error writing spec: %v", err)
}
conf.RootDir = rootDir
return bundleDir, nil
}
// writeSpec writes the spec to disk in the given directory.
func writeSpec(dir string, spec *specs.Spec) error {
b, err := json.Marshal(spec)
if err != nil {
return err
}
return ioutil.WriteFile(filepath.Join(dir, "config.json"), b, 0755)
}
// UniqueContainerID generates a unique container id for each test.
//
// The container id is used to create an abstract unix domain socket, which must
// be unique. While the container forbids creating two containers with the same
// name, sometimes between test runs the socket does not get cleaned up quickly
// enough, causing container creation to fail.
func UniqueContainerID() string {
return fmt.Sprintf("test-container-%d", time.Now().UnixNano())
}
// Copy copies file from src to dst.
func Copy(src, dst string) error {
in, err := os.Open(src)
if err != nil {
return err
}
defer in.Close()
out, err := os.Create(dst)
if err != nil {
return err
}
defer out.Close()
_, err = io.Copy(out, in)
return err
}
// Poll is a shorthand function to poll for something with given timeout.
func Poll(cb func() error, timeout time.Duration) error {
ctx, cancel := context.WithTimeout(context.Background(), timeout)
defer cancel()
b := backoff.WithContext(backoff.NewConstantBackOff(100*time.Millisecond), ctx)
return backoff.Retry(cb, b)
}
// WaitForHTTP tries GET requests on a port until the call succeeds or timeout.
func WaitForHTTP(port int, timeout time.Duration) error {
cb := func() error {
_, err := http.Get(fmt.Sprintf("http://localhost:%d/", port))
return err
}
return Poll(cb, timeout)
}
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