package main import ( "fmt" "regexp" "strings" "sync" "testing" "time" digest "github.com/opencontainers/go-digest" "gotest.tools/v3/assert" is "gotest.tools/v3/assert/cmp" ) // TestPullFromCentralRegistry pulls an image from the central registry and verifies that the client // prints all expected output. func (s *DockerHubPullSuite) TestPullFromCentralRegistry(c *testing.T) { testRequires(c, DaemonIsLinux) out := s.Cmd(c, "pull", "hello-world") defer deleteImages("hello-world") assert.Assert(c, strings.Contains(out, "Using default tag: latest"), "expected the 'latest' tag to be automatically assumed") assert.Assert(c, strings.Contains(out, "Pulling from library/hello-world"), "expected the 'library/' prefix to be automatically assumed") assert.Assert(c, strings.Contains(out, "Downloaded newer image for hello-world:latest")) matches := regexp.MustCompile(`Digest: (.+)\n`).FindAllStringSubmatch(out, -1) assert.Equal(c, len(matches), 1, "expected exactly one image digest in the output") assert.Equal(c, len(matches[0]), 2, "unexpected number of submatches for the digest") _, err := digest.Parse(matches[0][1]) assert.NilError(c, err, "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") assert.Equal(c, len(splitImg), 2) match, _ := regexp.MatchString(`hello-world\s+latest.*?`, splitImg[1]) assert.Assert(c, match, "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 *testing.T) { testRequires(c, DaemonIsLinux) type entry struct { repo string alias string tag string } entries := []entry{ {"asdfasdf", "asdfasdf", "foobar"}, {"asdfasdf", "library/asdfasdf", "foobar"}, {"asdfasdf", "asdfasdf", ""}, {"asdfasdf", "asdfasdf", "latest"}, {"asdfasdf", "library/asdfasdf", ""}, {"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 { assert.ErrorContains(c, record.err, "", "expected non-zero exit status when pulling non-existing image: %s", record.out) assert.Assert(c, strings.Contains(record.out, fmt.Sprintf("pull access denied for %s, repository does not exist or may require 'docker login'", record.e.repo)), "expected image not found error messages") } else { // pull -a on a nonexistent registry should fall back as well assert.ErrorContains(c, record.err, "", "expected non-zero exit status when pulling non-existing image: %s", record.out) assert.Assert(c, strings.Contains(record.out, fmt.Sprintf("pull access denied for %s, repository does not exist or may require 'docker login'", record.e.repo)), "expected image not found error messages") assert.Assert(c, !strings.Contains(record.out, "unauthorized"), `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 image // reference (tag, repository, central registry url, ...) doesn't trigger a new pull nor leads to // multiple images. func (s *DockerHubPullSuite) TestPullFromCentralRegistryImplicitRefParts(c *testing.T) { 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") } assert.Assert(c, strings.Contains(out, "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") assert.Equal(c, len(splitImg), 2) match, _ := regexp.MatchString(`hello-world\s+latest.*?`, splitImg[1]) assert.Assert(c, match, "invalid output for `docker images` (expected image and tag name)") } // TestPullScratchNotAllowed verifies that pulling 'scratch' is rejected. func (s *DockerHubPullSuite) TestPullScratchNotAllowed(c *testing.T) { testRequires(c, DaemonIsLinux) out, err := s.CmdWithError("pull", "scratch") assert.ErrorContains(c, err, "", "expected pull of scratch to fail") assert.Assert(c, strings.Contains(out, "'scratch' is a reserved name")) assert.Assert(c, !strings.Contains(out, "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 *testing.T) { testRequires(c, DaemonIsLinux) s.Cmd(c, "pull", "dockercore/engine-pull-all-test-fixture") outImageCmd := s.Cmd(c, "images", "dockercore/engine-pull-all-test-fixture") splitOutImageCmd := strings.Split(strings.TrimSpace(outImageCmd), "\n") assert.Equal(c, len(splitOutImageCmd), 2) s.Cmd(c, "pull", "--all-tags=true", "dockercore/engine-pull-all-test-fixture") outImageAllTagCmd := s.Cmd(c, "images", "dockercore/engine-pull-all-test-fixture") linesCount := strings.Count(outImageAllTagCmd, "\n") assert.Assert(c, linesCount > 2, "pulling all tags should provide more than two images, got %s", outImageAllTagCmd) // Verify that the line for 'dockercore/engine-pull-all-test-fixture:latest' is left unchanged. var latestLine string for _, line := range strings.Split(outImageAllTagCmd, "\n") { if strings.HasPrefix(line, "dockercore/engine-pull-all-test-fixture") && strings.Contains(line, "latest") { latestLine = line break } } assert.Assert(c, latestLine != "", "no entry for dockercore/engine-pull-all-test-fixture: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] = "" assert.Assert(c, is.DeepEqual(splitLatest, splitCurrent), "dockercore/engine-pull-all-test-fixture: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 *testing.T) { testRequires(c, DaemonIsLinux) repoName := "hello-world:latest" pullCmd := s.MakeCmd("pull", repoName) stdout, err := pullCmd.StdoutPipe() assert.NilError(c, err) err = pullCmd.Start() assert.NilError(c, err) go pullCmd.Wait() // Cancel as soon as we get some output. buf := make([]byte, 10) _, err = stdout.Read(buf) assert.NilError(c, err) err = pullCmd.Process.Kill() assert.NilError(c, err) time.Sleep(2 * time.Second) _, err = s.CmdWithError("inspect", repoName) assert.ErrorContains(c, err, "", "image was pulled after client disconnected") } // Regression test for https://github.com/docker/docker/issues/26429 func (s *DockerSuite) TestPullLinuxImageFailsOnWindows(c *testing.T) { testRequires(c, DaemonIsWindows, Network) _, _, err := dockerCmdWithError("pull", "ubuntu") assert.ErrorContains(c, err, "no matching manifest for windows") } // Regression test for https://github.com/docker/docker/issues/28892 func (s *DockerSuite) TestPullWindowsImageFailsOnLinux(c *testing.T) { testRequires(c, DaemonIsLinux, Network) _, _, err := dockerCmdWithError("pull", "mcr.microsoft.com/windows/servercore:ltsc2019") assert.ErrorContains(c, err, "no matching manifest for linux") }