484 lines
12 KiB
Go
484 lines
12 KiB
Go
// Copyright 2018 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Package testutil contains utility functions for runsc tests.
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package testutil
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import (
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"bufio"
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"context"
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"debug/elf"
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"encoding/base32"
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"encoding/json"
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"flag"
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"fmt"
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"io"
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"io/ioutil"
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"log"
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"math"
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"math/rand"
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"net/http"
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"os"
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"os/exec"
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"os/signal"
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"path/filepath"
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"strconv"
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"strings"
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"sync"
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"sync/atomic"
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"syscall"
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"time"
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"github.com/cenkalti/backoff"
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specs "github.com/opencontainers/runtime-spec/specs-go"
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"gvisor.dev/gvisor/runsc/boot"
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"gvisor.dev/gvisor/runsc/specutils"
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)
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var (
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checkpoint = flag.Bool("checkpoint", true, "control checkpoint/restore support")
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)
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func init() {
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rand.Seed(time.Now().UnixNano())
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}
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// IsCheckpointSupported returns the relevant command line flag.
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func IsCheckpointSupported() bool {
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return *checkpoint
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}
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// TmpDir returns the absolute path to a writable directory that can be used as
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// scratch by the test.
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func TmpDir() string {
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dir := os.Getenv("TEST_TMPDIR")
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if dir == "" {
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dir = "/tmp"
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}
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return dir
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}
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// ConfigureExePath configures the executable for runsc in the test environment.
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func ConfigureExePath() error {
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path, err := FindFile("runsc/runsc")
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if err != nil {
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return err
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}
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specutils.ExePath = path
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return nil
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}
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// FindFile searchs for a file inside the test run environment. It returns the
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// full path to the file. It fails if none or more than one file is found.
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func FindFile(path string) (string, error) {
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wd, err := os.Getwd()
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if err != nil {
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return "", err
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}
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// The test root is demarcated by a path element called "__main__". Search for
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// it backwards from the working directory.
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root := wd
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for {
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dir, name := filepath.Split(root)
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if name == "__main__" {
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break
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}
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if len(dir) == 0 {
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return "", fmt.Errorf("directory __main__ not found in %q", wd)
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}
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// Remove ending slash to loop around.
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root = dir[:len(dir)-1]
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}
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// Annoyingly, bazel adds the build type to the directory path for go
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// binaries, but not for c++ binaries. We use two different patterns to
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// to find our file.
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patterns := []string{
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// Try the obvious path first.
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filepath.Join(root, path),
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// If it was a go binary, use a wildcard to match the build
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// type. The pattern is: /test-path/__main__/directories/*/file.
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filepath.Join(root, filepath.Dir(path), "*", filepath.Base(path)),
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}
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for _, p := range patterns {
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matches, err := filepath.Glob(p)
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if err != nil {
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// "The only possible returned error is ErrBadPattern,
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// when pattern is malformed." -godoc
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return "", fmt.Errorf("error globbing %q: %v", p, err)
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}
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switch len(matches) {
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case 0:
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// Try the next pattern.
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case 1:
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// We found it.
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return matches[0], nil
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default:
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return "", fmt.Errorf("more than one match found for %q: %s", path, matches)
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}
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}
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return "", fmt.Errorf("file %q not found", path)
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}
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// TestConfig returns the default configuration to use in tests. Note that
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// 'RootDir' must be set by caller if required.
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func TestConfig() *boot.Config {
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return &boot.Config{
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Debug: true,
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LogFormat: "text",
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DebugLogFormat: "text",
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AlsoLogToStderr: true,
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LogPackets: true,
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Network: boot.NetworkNone,
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Strace: true,
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Platform: "ptrace",
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FileAccess: boot.FileAccessExclusive,
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TestOnlyAllowRunAsCurrentUserWithoutChroot: true,
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NumNetworkChannels: 1,
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}
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}
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// TestConfigWithRoot returns the default configuration to use in tests.
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func TestConfigWithRoot(rootDir string) *boot.Config {
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conf := TestConfig()
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conf.RootDir = rootDir
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return conf
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}
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// NewSpecWithArgs creates a simple spec with the given args suitable for use
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// in tests.
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func NewSpecWithArgs(args ...string) *specs.Spec {
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return &specs.Spec{
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// The host filesystem root is the container root.
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Root: &specs.Root{
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Path: "/",
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Readonly: true,
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},
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Process: &specs.Process{
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Args: args,
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Env: []string{
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"PATH=" + os.Getenv("PATH"),
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},
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Capabilities: specutils.AllCapabilities(),
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},
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Mounts: []specs.Mount{
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// Root is readonly, but many tests want to write to tmpdir.
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// This creates a writable mount inside the root. Also, when tmpdir points
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// to "/tmp", it makes the the actual /tmp to be mounted and not a tmpfs
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// inside the sentry.
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{
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Type: "bind",
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Destination: TmpDir(),
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Source: TmpDir(),
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},
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},
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Hostname: "runsc-test-hostname",
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}
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}
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// SetupRootDir creates a root directory for containers.
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func SetupRootDir() (string, error) {
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rootDir, err := ioutil.TempDir(TmpDir(), "containers")
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if err != nil {
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return "", fmt.Errorf("error creating root dir: %v", err)
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}
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return rootDir, nil
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}
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// SetupContainer creates a bundle and root dir for the container, generates a
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// test config, and writes the spec to config.json in the bundle dir.
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func SetupContainer(spec *specs.Spec, conf *boot.Config) (rootDir, bundleDir string, err error) {
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rootDir, err = SetupRootDir()
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if err != nil {
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return "", "", err
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}
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conf.RootDir = rootDir
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bundleDir, err = SetupBundleDir(spec)
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return rootDir, bundleDir, err
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}
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// SetupBundleDir creates a bundle dir and writes the spec to config.json.
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func SetupBundleDir(spec *specs.Spec) (bundleDir string, err error) {
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bundleDir, err = ioutil.TempDir(TmpDir(), "bundle")
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if err != nil {
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return "", fmt.Errorf("error creating bundle dir: %v", err)
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}
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if err = writeSpec(bundleDir, spec); err != nil {
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return "", fmt.Errorf("error writing spec: %v", err)
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}
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return bundleDir, nil
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}
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// writeSpec writes the spec to disk in the given directory.
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func writeSpec(dir string, spec *specs.Spec) error {
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b, err := json.Marshal(spec)
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if err != nil {
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return err
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}
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return ioutil.WriteFile(filepath.Join(dir, "config.json"), b, 0755)
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}
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// UniqueContainerID generates a unique container id for each test.
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//
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// The container id is used to create an abstract unix domain socket, which must
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// be unique. While the container forbids creating two containers with the same
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// name, sometimes between test runs the socket does not get cleaned up quickly
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// enough, causing container creation to fail.
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func UniqueContainerID() string {
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// Read 20 random bytes.
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b := make([]byte, 20)
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// "[Read] always returns len(p) and a nil error." --godoc
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if _, err := rand.Read(b); err != nil {
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panic("rand.Read failed: " + err.Error())
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}
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// base32 encode the random bytes, so that the name is a valid
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// container id and can be used as a socket name in the filesystem.
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return fmt.Sprintf("test-container-%s", base32.StdEncoding.EncodeToString(b))
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}
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// Copy copies file from src to dst.
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func Copy(src, dst string) error {
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in, err := os.Open(src)
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if err != nil {
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return err
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}
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defer in.Close()
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out, err := os.Create(dst)
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if err != nil {
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return err
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}
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defer out.Close()
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_, err = io.Copy(out, in)
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return err
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}
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// Poll is a shorthand function to poll for something with given timeout.
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func Poll(cb func() error, timeout time.Duration) error {
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ctx, cancel := context.WithTimeout(context.Background(), timeout)
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defer cancel()
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b := backoff.WithContext(backoff.NewConstantBackOff(100*time.Millisecond), ctx)
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return backoff.Retry(cb, b)
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}
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// WaitForHTTP tries GET requests on a port until the call succeeds or timeout.
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func WaitForHTTP(port int, timeout time.Duration) error {
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cb := func() error {
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c := &http.Client{
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// Calculate timeout to be able to do minimum 5 attempts.
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Timeout: timeout / 5,
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}
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url := fmt.Sprintf("http://localhost:%d/", port)
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resp, err := c.Get(url)
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if err != nil {
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log.Printf("Waiting %s: %v", url, err)
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return err
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}
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resp.Body.Close()
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return nil
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}
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return Poll(cb, timeout)
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}
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// Reaper reaps child processes.
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type Reaper struct {
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// mu protects ch, which will be nil if the reaper is not running.
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mu sync.Mutex
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ch chan os.Signal
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}
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// Start starts reaping child processes.
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func (r *Reaper) Start() {
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r.mu.Lock()
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defer r.mu.Unlock()
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if r.ch != nil {
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panic("reaper.Start called on a running reaper")
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}
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r.ch = make(chan os.Signal, 1)
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signal.Notify(r.ch, syscall.SIGCHLD)
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go func() {
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for {
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r.mu.Lock()
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ch := r.ch
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r.mu.Unlock()
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if ch == nil {
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return
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}
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_, ok := <-ch
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if !ok {
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// Channel closed.
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return
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}
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for {
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cpid, _ := syscall.Wait4(-1, nil, syscall.WNOHANG, nil)
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if cpid < 1 {
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break
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}
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}
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}
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}()
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}
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// Stop stops reaping child processes.
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func (r *Reaper) Stop() {
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r.mu.Lock()
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defer r.mu.Unlock()
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if r.ch == nil {
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panic("reaper.Stop called on a stopped reaper")
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}
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signal.Stop(r.ch)
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close(r.ch)
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r.ch = nil
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}
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// StartReaper is a helper that starts a new Reaper and returns a function to
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// stop it.
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func StartReaper() func() {
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r := &Reaper{}
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r.Start()
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return r.Stop
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}
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// WaitUntilRead reads from the given reader until the wanted string is found
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// or until timeout.
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func WaitUntilRead(r io.Reader, want string, split bufio.SplitFunc, timeout time.Duration) error {
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sc := bufio.NewScanner(r)
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if split != nil {
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sc.Split(split)
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}
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// done must be accessed atomically. A value greater than 0 indicates
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// that the read loop can exit.
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var done uint32
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doneCh := make(chan struct{})
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go func() {
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for sc.Scan() {
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t := sc.Text()
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if strings.Contains(t, want) {
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atomic.StoreUint32(&done, 1)
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close(doneCh)
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break
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}
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if atomic.LoadUint32(&done) > 0 {
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break
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}
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}
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}()
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select {
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case <-time.After(timeout):
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atomic.StoreUint32(&done, 1)
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return fmt.Errorf("timeout waiting to read %q", want)
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case <-doneCh:
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return nil
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}
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}
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// KillCommand kills the process running cmd unless it hasn't been started. It
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// returns an error if it cannot kill the process unless the reason is that the
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// process has already exited.
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func KillCommand(cmd *exec.Cmd) error {
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if cmd.Process == nil {
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return nil
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}
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if err := cmd.Process.Kill(); err != nil {
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if !strings.Contains(err.Error(), "process already finished") {
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return fmt.Errorf("failed to kill process %v: %v", cmd, err)
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}
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}
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return nil
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}
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// WriteTmpFile writes text to a temporary file, closes the file, and returns
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// the name of the file.
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func WriteTmpFile(pattern, text string) (string, error) {
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file, err := ioutil.TempFile(TmpDir(), pattern)
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if err != nil {
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return "", err
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}
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defer file.Close()
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if _, err := file.Write([]byte(text)); err != nil {
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return "", err
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}
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return file.Name(), nil
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}
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// RandomName create a name with a 6 digit random number appended to it.
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func RandomName(prefix string) string {
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return fmt.Sprintf("%s-%06d", prefix, rand.Int31n(1000000))
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}
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// IsStatic returns true iff the given file is a static binary.
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func IsStatic(filename string) (bool, error) {
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f, err := elf.Open(filename)
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if err != nil {
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return false, err
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}
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for _, prog := range f.Progs {
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if prog.Type == elf.PT_INTERP {
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return false, nil // Has interpreter.
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}
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}
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return true, nil
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}
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// TestBoundsForShard calculates the beginning and end indices for the test
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// based on the TEST_SHARD_INDEX and TEST_TOTAL_SHARDS environment vars. The
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// returned ints are the beginning (inclusive) and end (exclusive) of the
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// subslice corresponding to the shard. If either of the env vars are not
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// present, then the function will return bounds that include all tests. If
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// there are more shards than there are tests, then the returned list may be
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// empty.
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func TestBoundsForShard(numTests int) (int, int, error) {
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var (
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begin = 0
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end = numTests
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)
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indexStr, totalStr := os.Getenv("TEST_SHARD_INDEX"), os.Getenv("TEST_TOTAL_SHARDS")
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if indexStr == "" || totalStr == "" {
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return begin, end, nil
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}
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// Parse index and total to ints.
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shardIndex, err := strconv.Atoi(indexStr)
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if err != nil {
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return 0, 0, fmt.Errorf("invalid TEST_SHARD_INDEX %q: %v", indexStr, err)
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}
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shardTotal, err := strconv.Atoi(totalStr)
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if err != nil {
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return 0, 0, fmt.Errorf("invalid TEST_TOTAL_SHARDS %q: %v", totalStr, err)
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}
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// Calculate!
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shardSize := int(math.Ceil(float64(numTests) / float64(shardTotal)))
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begin = shardIndex * shardSize
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end = ((shardIndex + 1) * shardSize)
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if begin > numTests {
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// Nothing to run.
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return 0, 0, nil
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}
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if end > numTests {
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end = numTests
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}
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return begin, end, nil
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}
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