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package main

import (

"fmt"

"regexp"

"strings"

"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"))

if splitImg := strings.Split(img, "\n"); len(splitImg) != 2 {

c.Fatalf("expected only two lines in the output of `docker images`, got %d", len(splitImg))

} else if re := regexp.MustCompile(`^hello-world\s+latest`); !re.Match([]byte(splitImg[1])) {

c.Fatal("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)

for _, e := range []struct {

Image string

Alias string

}{

{"library/asdfasdf:foobar", "asdfasdf:foobar"},

{"library/asdfasdf:foobar", "library/asdfasdf:foobar"},

{"library/asdfasdf:latest", "asdfasdf"},

{"library/asdfasdf:latest", "asdfasdf:latest"},

{"library/asdfasdf:latest", "library/asdfasdf"},

{"library/asdfasdf:latest", "library/asdfasdf:latest"},

} {

out, err := s.CmdWithError("pull", e.Alias)

c.Assert(err, checker.NotNil, check.Commentf("expected non-zero exit status when pulling non-existing image: %s", out))

c.Assert(out, checker.Contains, fmt.Sprintf("Error: image %s not found", e.Image), check.Commentf("expected image not found error messages"))

}

}

// 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)

s.Cmd(c, "pull", "hello-world")

defer deleteImages("hello-world")

for _, i := 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",

} {

out := s.Cmd(c, "pull", i)

c.Assert(out, checker.Contains, "Image is up to date for hello-world:latest")

}

// We should have a single entry in images.

img := strings.TrimSpace(s.Cmd(c, "images"))

if splitImg := strings.Split(img, "\n"); len(splitImg) != 2 {

c.Fatalf("expected only two lines in the output of `docker images`, got %d", len(splitImg))

} else if re := regexp.MustCompile(`^hello-world\s+latest`); !re.Match([]byte(splitImg[1])) {

c.Fatal("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, check.Commentf("expected a single entry in images\n%v", outImageCmd))

s.Cmd(c, "pull", "--all-tags=true", "busybox")

outImageAllTagCmd := s.Cmd(c, "images", "busybox")

if linesCount := strings.Count(outImageAllTagCmd, "\n"); linesCount <= 2 {

c.Fatalf("pulling all tags should provide more images, got %d", linesCount-1)

}

// 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])

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

// still succesfully completes on the daemon side.

//

// 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)

maxAttempts := 20

for i := 0; ; i++ {

if _, err := s.CmdWithError("inspect", repoName); err == nil {

break

}

if i >= maxAttempts {

c.Fatal("timeout reached: image was not pulled after client disconnected")

}

time.Sleep(500 * time.Millisecond)

}

}