package main import ( "fmt" "regexp" "strings" "sync" "time" "github.com/docker/distribution/digest" "github.com/docker/docker/pkg/integration/checker" "github.com/go-check/check" ) // TestPullFromCentralRegistry pulls an image from the central registry and verifies that the client // prints all expected output. func (s *DockerHubPullSuite) TestPullFromCentralRegistry(c *check.C) { testRequires(c, DaemonIsLinux) out := s.Cmd(c, "pull", "hello-world") defer deleteImages("hello-world") c.Assert(out, checker.Contains, "Using default tag: latest", check.Commentf("expected the 'latest' tag to be automatically assumed")) c.Assert(out, checker.Contains, "Pulling from library/hello-world", check.Commentf("expected the 'library/' prefix to be automatically assumed")) c.Assert(out, checker.Contains, "Downloaded newer image for hello-world:latest") matches := regexp.MustCompile(`Digest: (.+)\n`).FindAllStringSubmatch(out, -1) c.Assert(len(matches), checker.Equals, 1, check.Commentf("expected exactly one image digest in the output")) c.Assert(len(matches[0]), checker.Equals, 2, check.Commentf("unexpected number of submatches for the digest")) _, err := digest.ParseDigest(matches[0][1]) c.Check(err, checker.IsNil, check.Commentf("invalid digest %q in output", matches[0][1])) // We should have a single entry in images. img := strings.TrimSpace(s.Cmd(c, "images")) splitImg := strings.Split(img, "\n") c.Assert(splitImg, checker.HasLen, 2) c.Assert(splitImg[1], checker.Matches, `hello-world\s+latest.*?`, check.Commentf("invalid output for `docker images` (expected image and tag name")) } // TestPullNonExistingImage pulls non-existing images from the central registry, with different // combinations of implicit tag and library prefix. func (s *DockerHubPullSuite) TestPullNonExistingImage(c *check.C) { testRequires(c, DaemonIsLinux) type entry struct { repo string alias string tag string } entries := []entry{ {"library/asdfasdf", "asdfasdf", "foobar"}, {"library/asdfasdf", "library/asdfasdf", "foobar"}, {"library/asdfasdf", "asdfasdf", ""}, {"library/asdfasdf", "asdfasdf", "latest"}, {"library/asdfasdf", "library/asdfasdf", ""}, {"library/asdfasdf", "library/asdfasdf", "latest"}, } // The option field indicates "-a" or not. type record struct { e entry option string out string err error } // Execute 'docker pull' in parallel, pass results (out, err) and // necessary information ("-a" or not, and the image name) to channel. var group sync.WaitGroup recordChan := make(chan record, len(entries)*2) for _, e := range entries { group.Add(1) go func(e entry) { defer group.Done() repoName := e.alias if e.tag != "" { repoName += ":" + e.tag } out, err := s.CmdWithError("pull", repoName) recordChan <- record{e, "", out, err} }(e) if e.tag == "" { // pull -a on a nonexistent registry should fall back as well group.Add(1) go func(e entry) { defer group.Done() out, err := s.CmdWithError("pull", "-a", e.alias) recordChan <- record{e, "-a", out, err} }(e) } } // Wait for completion group.Wait() close(recordChan) // Process the results (out, err). for record := range recordChan { if len(record.option) == 0 { c.Assert(record.err, checker.NotNil, check.Commentf("expected non-zero exit status when pulling non-existing image: %s", record.out)) // Hub returns 401 rather than 404 for nonexistent repos over // the v2 protocol - but we should end up falling back to v1, // which does return a 404. tag := record.e.tag if tag == "" { tag = "latest" } c.Assert(record.out, checker.Contains, fmt.Sprintf("Error: image %s:%s not found", record.e.repo, tag), check.Commentf("expected image not found error messages")) } else { // pull -a on a nonexistent registry should fall back as well c.Assert(record.err, checker.NotNil, check.Commentf("expected non-zero exit status when pulling non-existing image: %s", record.out)) c.Assert(record.out, checker.Contains, fmt.Sprintf("Error: image %s not found", record.e.repo), check.Commentf("expected image not found error messages")) c.Assert(record.out, checker.Not(checker.Contains), "unauthorized", check.Commentf(`message should not contain "unauthorized"`)) } } } // TestPullFromCentralRegistryImplicitRefParts pulls an image from the central registry and verifies // that pulling the same image with different combinations of implicit elements of the the image // reference (tag, repository, central registry url, ...) doesn't trigger a new pull nor leads to // multiple images. func (s *DockerHubPullSuite) TestPullFromCentralRegistryImplicitRefParts(c *check.C) { testRequires(c, DaemonIsLinux) // Pull hello-world from v2 pullFromV2 := func(ref string) (int, string) { out := s.Cmd(c, "pull", "hello-world") v1Retries := 0 for strings.Contains(out, "this image was pulled from a legacy registry") { // Some network errors may cause fallbacks to the v1 // protocol, which would violate the test's assumption // that it will get the same images. To make the test // more robust against these network glitches, allow a // few retries if we end up with a v1 pull. if v1Retries > 2 { c.Fatalf("too many v1 fallback incidents when pulling %s", ref) } s.Cmd(c, "rmi", ref) out = s.Cmd(c, "pull", ref) v1Retries++ } return v1Retries, out } pullFromV2("hello-world") defer deleteImages("hello-world") s.Cmd(c, "tag", "hello-world", "hello-world-backup") for _, ref := range []string{ "hello-world", "hello-world:latest", "library/hello-world", "library/hello-world:latest", "docker.io/library/hello-world", "index.docker.io/library/hello-world", } { var out string for { var v1Retries int v1Retries, out = pullFromV2(ref) // Keep repeating the test case until we don't hit a v1 // fallback case. We won't get the right "Image is up // to date" message if the local image was replaced // with one pulled from v1. if v1Retries == 0 { break } s.Cmd(c, "rmi", ref) s.Cmd(c, "tag", "hello-world-backup", "hello-world") } c.Assert(out, checker.Contains, "Image is up to date for hello-world:latest") } s.Cmd(c, "rmi", "hello-world-backup") // We should have a single entry in images. img := strings.TrimSpace(s.Cmd(c, "images")) splitImg := strings.Split(img, "\n") c.Assert(splitImg, checker.HasLen, 2) c.Assert(splitImg[1], checker.Matches, `hello-world\s+latest.*?`, check.Commentf("invalid output for `docker images` (expected image and tag name")) } // TestPullScratchNotAllowed verifies that pulling 'scratch' is rejected. func (s *DockerHubPullSuite) TestPullScratchNotAllowed(c *check.C) { testRequires(c, DaemonIsLinux) out, err := s.CmdWithError("pull", "scratch") c.Assert(err, checker.NotNil, check.Commentf("expected pull of scratch to fail")) c.Assert(out, checker.Contains, "'scratch' is a reserved name") c.Assert(out, checker.Not(checker.Contains), "Pulling repository scratch") } // TestPullAllTagsFromCentralRegistry pulls using `all-tags` for a given image and verifies that it // results in more images than a naked pull. func (s *DockerHubPullSuite) TestPullAllTagsFromCentralRegistry(c *check.C) { testRequires(c, DaemonIsLinux) s.Cmd(c, "pull", "busybox") outImageCmd := s.Cmd(c, "images", "busybox") splitOutImageCmd := strings.Split(strings.TrimSpace(outImageCmd), "\n") c.Assert(splitOutImageCmd, checker.HasLen, 2) s.Cmd(c, "pull", "--all-tags=true", "busybox") outImageAllTagCmd := s.Cmd(c, "images", "busybox") linesCount := strings.Count(outImageAllTagCmd, "\n") c.Assert(linesCount, checker.GreaterThan, 2, check.Commentf("pulling all tags should provide more than two images, got %s", outImageAllTagCmd)) // Verify that the line for 'busybox:latest' is left unchanged. var latestLine string for _, line := range strings.Split(outImageAllTagCmd, "\n") { if strings.HasPrefix(line, "busybox") && strings.Contains(line, "latest") { latestLine = line break } } c.Assert(latestLine, checker.Not(checker.Equals), "", check.Commentf("no entry for busybox:latest found after pulling all tags")) splitLatest := strings.Fields(latestLine) splitCurrent := strings.Fields(splitOutImageCmd[1]) // Clear relative creation times, since these can easily change between // two invocations of "docker images". Without this, the test can fail // like this: // ... obtained []string = []string{"busybox", "latest", "d9551b4026f0", "27", "minutes", "ago", "1.113", "MB"} // ... expected []string = []string{"busybox", "latest", "d9551b4026f0", "26", "minutes", "ago", "1.113", "MB"} splitLatest[3] = "" splitLatest[4] = "" splitLatest[5] = "" splitCurrent[3] = "" splitCurrent[4] = "" splitCurrent[5] = "" c.Assert(splitLatest, checker.DeepEquals, splitCurrent, check.Commentf("busybox:latest was changed after pulling all tags")) } // TestPullClientDisconnect kills the client during a pull operation and verifies that the operation // gets cancelled. // // Ref: docker/docker#15589 func (s *DockerHubPullSuite) TestPullClientDisconnect(c *check.C) { testRequires(c, DaemonIsLinux) repoName := "hello-world:latest" pullCmd := s.MakeCmd("pull", repoName) stdout, err := pullCmd.StdoutPipe() c.Assert(err, checker.IsNil) err = pullCmd.Start() c.Assert(err, checker.IsNil) // Cancel as soon as we get some output. buf := make([]byte, 10) _, err = stdout.Read(buf) c.Assert(err, checker.IsNil) err = pullCmd.Process.Kill() c.Assert(err, checker.IsNil) time.Sleep(2 * time.Second) _, err = s.CmdWithError("inspect", repoName) c.Assert(err, checker.NotNil, check.Commentf("image was pulled after client disconnected")) } func (s *DockerRegistryAuthHtpasswdSuite) TestPullNoCredentialsNotFound(c *check.C) { // we don't care about the actual image, we just want to see image not found // because that means v2 call returned 401 and we fell back to v1 which usually // gives a 404 (in this case the test registry doesn't handle v1 at all) out, _, err := dockerCmdWithError("pull", privateRegistryURL+"/busybox") c.Assert(err, check.NotNil, check.Commentf(out)) c.Assert(out, checker.Contains, "Error: image busybox:latest not found") } // Regression test for https://github.com/docker/docker/issues/26429 func (s *DockerSuite) TestPullLinuxImageFailsOnWindows(c *check.C) { testRequires(c, DaemonIsWindows, Network) _, _, err := dockerCmdWithError("pull", "ubuntu") c.Assert(err.Error(), checker.Contains, "cannot be used on this platform") }