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moby--moby/integration-cli/docker_cli_push_test.go
Aaron Lehmann 5c99eebe81 Fix concurrent uploads that share layers
Concurrent uploads which share layers worked correctly as of #18353,
but unfortunately #18785 caused a regression. This PR removed the logic
that shares digests between different push sessions. This overlooked the
case where one session was waiting for another session to upload a
layer.

This commit adds back the ability to propagate this digest information,
using the distribution.Descriptor type because this is what is received
from stats and uploads, and also what is ultimately needed for building
the manifest.

Surprisingly, there was no test covering this case. This commit adds
one. It fails without the fix.

See recent comments on #9132.

Signed-off-by: Aaron Lehmann <aaron.lehmann@docker.com>
2016-03-01 11:14:44 -08:00

522 lines
22 KiB
Go

package main
import (
"archive/tar"
"fmt"
"io/ioutil"
"os"
"os/exec"
"path/filepath"
"strings"
"time"
"github.com/docker/distribution/digest"
"github.com/docker/docker/cliconfig"
"github.com/docker/docker/pkg/integration/checker"
"github.com/go-check/check"
)
// Pushing an image to a private registry.
func testPushBusyboxImage(c *check.C) {
repoName := fmt.Sprintf("%v/dockercli/busybox", privateRegistryURL)
// tag the image to upload it to the private registry
dockerCmd(c, "tag", "busybox", repoName)
// push the image to the registry
dockerCmd(c, "push", repoName)
}
func (s *DockerRegistrySuite) TestPushBusyboxImage(c *check.C) {
testPushBusyboxImage(c)
}
func (s *DockerSchema1RegistrySuite) TestPushBusyboxImage(c *check.C) {
testPushBusyboxImage(c)
}
// pushing an image without a prefix should throw an error
func (s *DockerSuite) TestPushUnprefixedRepo(c *check.C) {
out, _, err := dockerCmdWithError("push", "busybox")
c.Assert(err, check.NotNil, check.Commentf("pushing an unprefixed repo didn't result in a non-zero exit status: %s", out))
}
func testPushUntagged(c *check.C) {
repoName := fmt.Sprintf("%v/dockercli/busybox", privateRegistryURL)
expected := "Repository does not exist"
out, _, err := dockerCmdWithError("push", repoName)
c.Assert(err, check.NotNil, check.Commentf("pushing the image to the private registry should have failed: output %q", out))
c.Assert(out, checker.Contains, expected, check.Commentf("pushing the image failed"))
}
func (s *DockerRegistrySuite) TestPushUntagged(c *check.C) {
testPushUntagged(c)
}
func (s *DockerSchema1RegistrySuite) TestPushUntagged(c *check.C) {
testPushUntagged(c)
}
func testPushBadTag(c *check.C) {
repoName := fmt.Sprintf("%v/dockercli/busybox:latest", privateRegistryURL)
expected := "does not exist"
out, _, err := dockerCmdWithError("push", repoName)
c.Assert(err, check.NotNil, check.Commentf("pushing the image to the private registry should have failed: output %q", out))
c.Assert(out, checker.Contains, expected, check.Commentf("pushing the image failed"))
}
func (s *DockerRegistrySuite) TestPushBadTag(c *check.C) {
testPushBadTag(c)
}
func (s *DockerSchema1RegistrySuite) TestPushBadTag(c *check.C) {
testPushBadTag(c)
}
func testPushMultipleTags(c *check.C) {
repoName := fmt.Sprintf("%v/dockercli/busybox", privateRegistryURL)
repoTag1 := fmt.Sprintf("%v/dockercli/busybox:t1", privateRegistryURL)
repoTag2 := fmt.Sprintf("%v/dockercli/busybox:t2", privateRegistryURL)
// tag the image and upload it to the private registry
dockerCmd(c, "tag", "busybox", repoTag1)
dockerCmd(c, "tag", "busybox", repoTag2)
dockerCmd(c, "push", repoName)
// Ensure layer list is equivalent for repoTag1 and repoTag2
out1, _ := dockerCmd(c, "pull", repoTag1)
imageAlreadyExists := ": Image already exists"
var out1Lines []string
for _, outputLine := range strings.Split(out1, "\n") {
if strings.Contains(outputLine, imageAlreadyExists) {
out1Lines = append(out1Lines, outputLine)
}
}
out2, _ := dockerCmd(c, "pull", repoTag2)
var out2Lines []string
for _, outputLine := range strings.Split(out2, "\n") {
if strings.Contains(outputLine, imageAlreadyExists) {
out1Lines = append(out1Lines, outputLine)
}
}
c.Assert(out2Lines, checker.HasLen, len(out1Lines))
for i := range out1Lines {
c.Assert(out1Lines[i], checker.Equals, out2Lines[i])
}
}
func (s *DockerRegistrySuite) TestPushMultipleTags(c *check.C) {
testPushMultipleTags(c)
}
func (s *DockerSchema1RegistrySuite) TestPushMultipleTags(c *check.C) {
testPushMultipleTags(c)
}
func testPushEmptyLayer(c *check.C) {
repoName := fmt.Sprintf("%v/dockercli/emptylayer", privateRegistryURL)
emptyTarball, err := ioutil.TempFile("", "empty_tarball")
c.Assert(err, check.IsNil, check.Commentf("Unable to create test file"))
tw := tar.NewWriter(emptyTarball)
err = tw.Close()
c.Assert(err, check.IsNil, check.Commentf("Error creating empty tarball"))
freader, err := os.Open(emptyTarball.Name())
c.Assert(err, check.IsNil, check.Commentf("Could not open test tarball"))
importCmd := exec.Command(dockerBinary, "import", "-", repoName)
importCmd.Stdin = freader
out, _, err := runCommandWithOutput(importCmd)
c.Assert(err, check.IsNil, check.Commentf("import failed: %q", out))
// Now verify we can push it
out, _, err = dockerCmdWithError("push", repoName)
c.Assert(err, check.IsNil, check.Commentf("pushing the image to the private registry has failed: %s", out))
}
func (s *DockerRegistrySuite) TestPushEmptyLayer(c *check.C) {
testPushEmptyLayer(c)
}
func (s *DockerSchema1RegistrySuite) TestPushEmptyLayer(c *check.C) {
testPushEmptyLayer(c)
}
// testConcurrentPush pushes multiple tags to the same repo
// concurrently.
func testConcurrentPush(c *check.C) {
repoName := fmt.Sprintf("%v/dockercli/busybox", privateRegistryURL)
repos := []string{}
for _, tag := range []string{"push1", "push2", "push3"} {
repo := fmt.Sprintf("%v:%v", repoName, tag)
_, err := buildImage(repo, fmt.Sprintf(`
FROM busybox
ENTRYPOINT ["/bin/echo"]
ENV FOO foo
ENV BAR bar
CMD echo %s
`, repo), true)
c.Assert(err, checker.IsNil)
repos = append(repos, repo)
}
// Push tags, in parallel
results := make(chan error)
for _, repo := range repos {
go func(repo string) {
_, _, err := runCommandWithOutput(exec.Command(dockerBinary, "push", repo))
results <- err
}(repo)
}
for range repos {
err := <-results
c.Assert(err, checker.IsNil, check.Commentf("concurrent push failed with error: %v", err))
}
// Clear local images store.
args := append([]string{"rmi"}, repos...)
dockerCmd(c, args...)
// Re-pull and run individual tags, to make sure pushes succeeded
for _, repo := range repos {
dockerCmd(c, "pull", repo)
dockerCmd(c, "inspect", repo)
out, _ := dockerCmd(c, "run", "--rm", repo)
c.Assert(strings.TrimSpace(out), checker.Equals, "/bin/sh -c echo "+repo)
}
}
func (s *DockerRegistrySuite) TestConcurrentPush(c *check.C) {
testConcurrentPush(c)
}
func (s *DockerSchema1RegistrySuite) TestConcurrentPush(c *check.C) {
testConcurrentPush(c)
}
func (s *DockerRegistrySuite) TestCrossRepositoryLayerPush(c *check.C) {
sourceRepoName := fmt.Sprintf("%v/dockercli/busybox", privateRegistryURL)
// tag the image to upload it to the private registry
dockerCmd(c, "tag", "busybox", sourceRepoName)
// push the image to the registry
out1, _, err := dockerCmdWithError("push", sourceRepoName)
c.Assert(err, check.IsNil, check.Commentf("pushing the image to the private registry has failed: %s", out1))
// ensure that none of the layers were mounted from another repository during push
c.Assert(strings.Contains(out1, "Mounted from"), check.Equals, false)
digest1 := digest.DigestRegexp.FindString(out1)
c.Assert(len(digest1), checker.GreaterThan, 0, check.Commentf("no digest found for pushed manifest"))
destRepoName := fmt.Sprintf("%v/dockercli/crossrepopush", privateRegistryURL)
// retag the image to upload the same layers to another repo in the same registry
dockerCmd(c, "tag", "busybox", destRepoName)
// push the image to the registry
out2, _, err := dockerCmdWithError("push", destRepoName)
c.Assert(err, check.IsNil, check.Commentf("pushing the image to the private registry has failed: %s", out2))
// ensure that layers were mounted from the first repo during push
c.Assert(strings.Contains(out2, "Mounted from dockercli/busybox"), check.Equals, true)
digest2 := digest.DigestRegexp.FindString(out2)
c.Assert(len(digest2), checker.GreaterThan, 0, check.Commentf("no digest found for pushed manifest"))
c.Assert(digest1, check.Equals, digest2)
// ensure that we can pull and run the cross-repo-pushed repository
dockerCmd(c, "rmi", destRepoName)
dockerCmd(c, "pull", destRepoName)
out3, _ := dockerCmd(c, "run", destRepoName, "echo", "-n", "hello world")
c.Assert(out3, check.Equals, "hello world")
}
func (s *DockerSchema1RegistrySuite) TestCrossRepositoryLayerPushNotSupported(c *check.C) {
sourceRepoName := fmt.Sprintf("%v/dockercli/busybox", privateRegistryURL)
// tag the image to upload it to the private registry
dockerCmd(c, "tag", "busybox", sourceRepoName)
// push the image to the registry
out1, _, err := dockerCmdWithError("push", sourceRepoName)
c.Assert(err, check.IsNil, check.Commentf("pushing the image to the private registry has failed: %s", out1))
// ensure that none of the layers were mounted from another repository during push
c.Assert(strings.Contains(out1, "Mounted from"), check.Equals, false)
digest1 := digest.DigestRegexp.FindString(out1)
c.Assert(len(digest1), checker.GreaterThan, 0, check.Commentf("no digest found for pushed manifest"))
destRepoName := fmt.Sprintf("%v/dockercli/crossrepopush", privateRegistryURL)
// retag the image to upload the same layers to another repo in the same registry
dockerCmd(c, "tag", "busybox", destRepoName)
// push the image to the registry
out2, _, err := dockerCmdWithError("push", destRepoName)
c.Assert(err, check.IsNil, check.Commentf("pushing the image to the private registry has failed: %s", out2))
// schema1 registry should not support cross-repo layer mounts, so ensure that this does not happen
c.Assert(strings.Contains(out2, "Mounted from"), check.Equals, false)
digest2 := digest.DigestRegexp.FindString(out2)
c.Assert(len(digest2), checker.GreaterThan, 0, check.Commentf("no digest found for pushed manifest"))
c.Assert(digest1, check.Equals, digest2)
// ensure that we can pull and run the second pushed repository
dockerCmd(c, "rmi", destRepoName)
dockerCmd(c, "pull", destRepoName)
out3, _ := dockerCmd(c, "run", destRepoName, "echo", "-n", "hello world")
c.Assert(out3, check.Equals, "hello world")
}
func (s *DockerTrustSuite) TestTrustedPush(c *check.C) {
repoName := fmt.Sprintf("%v/dockerclitrusted/pushtest:latest", privateRegistryURL)
// tag the image and upload it to the private registry
dockerCmd(c, "tag", "busybox", repoName)
pushCmd := exec.Command(dockerBinary, "push", repoName)
s.trustedCmd(pushCmd)
out, _, err := runCommandWithOutput(pushCmd)
c.Assert(err, check.IsNil, check.Commentf("Error running trusted push: %s\n%s", err, out))
c.Assert(out, checker.Contains, "Signing and pushing trust metadata", check.Commentf("Missing expected output on trusted push"))
// Try pull after push
pullCmd := exec.Command(dockerBinary, "pull", repoName)
s.trustedCmd(pullCmd)
out, _, err = runCommandWithOutput(pullCmd)
c.Assert(err, check.IsNil, check.Commentf(out))
c.Assert(string(out), checker.Contains, "Status: Downloaded", check.Commentf(out))
}
func (s *DockerTrustSuite) TestTrustedPushWithEnvPasswords(c *check.C) {
repoName := fmt.Sprintf("%v/dockerclienv/trusted:latest", privateRegistryURL)
// tag the image and upload it to the private registry
dockerCmd(c, "tag", "busybox", repoName)
pushCmd := exec.Command(dockerBinary, "push", repoName)
s.trustedCmdWithPassphrases(pushCmd, "12345678", "12345678")
out, _, err := runCommandWithOutput(pushCmd)
c.Assert(err, check.IsNil, check.Commentf("Error running trusted push: %s\n%s", err, out))
c.Assert(out, checker.Contains, "Signing and pushing trust metadata", check.Commentf("Missing expected output on trusted push"))
// Try pull after push
pullCmd := exec.Command(dockerBinary, "pull", repoName)
s.trustedCmd(pullCmd)
out, _, err = runCommandWithOutput(pullCmd)
c.Assert(err, check.IsNil, check.Commentf(out))
c.Assert(string(out), checker.Contains, "Status: Downloaded", check.Commentf(out))
}
// This test ensures backwards compatibility with old ENV variables. Should be
// deprecated by 1.10
func (s *DockerTrustSuite) TestTrustedPushWithDeprecatedEnvPasswords(c *check.C) {
repoName := fmt.Sprintf("%v/dockercli/trusteddeprecated:latest", privateRegistryURL)
// tag the image and upload it to the private registry
dockerCmd(c, "tag", "busybox", repoName)
pushCmd := exec.Command(dockerBinary, "push", repoName)
s.trustedCmdWithDeprecatedEnvPassphrases(pushCmd, "12345678", "12345678")
out, _, err := runCommandWithOutput(pushCmd)
c.Assert(err, check.IsNil, check.Commentf("Error running trusted push: %s\n%s", err, out))
c.Assert(out, checker.Contains, "Signing and pushing trust metadata", check.Commentf("Missing expected output on trusted push"))
}
func (s *DockerTrustSuite) TestTrustedPushWithFailingServer(c *check.C) {
repoName := fmt.Sprintf("%v/dockerclitrusted/failingserver:latest", privateRegistryURL)
// tag the image and upload it to the private registry
dockerCmd(c, "tag", "busybox", repoName)
pushCmd := exec.Command(dockerBinary, "push", repoName)
s.trustedCmdWithServer(pushCmd, "https://example.com:81/")
out, _, err := runCommandWithOutput(pushCmd)
c.Assert(err, check.NotNil, check.Commentf("Missing error while running trusted push w/ no server"))
c.Assert(out, checker.Contains, "error contacting notary server", check.Commentf("Missing expected output on trusted push"))
}
func (s *DockerTrustSuite) TestTrustedPushWithoutServerAndUntrusted(c *check.C) {
repoName := fmt.Sprintf("%v/dockerclitrusted/trustedandnot:latest", privateRegistryURL)
// tag the image and upload it to the private registry
dockerCmd(c, "tag", "busybox", repoName)
pushCmd := exec.Command(dockerBinary, "push", "--disable-content-trust", repoName)
s.trustedCmdWithServer(pushCmd, "https://example.com/")
out, _, err := runCommandWithOutput(pushCmd)
c.Assert(err, check.IsNil, check.Commentf("trusted push with no server and --disable-content-trust failed: %s\n%s", err, out))
c.Assert(out, check.Not(checker.Contains), "Error establishing connection to notary repository", check.Commentf("Missing expected output on trusted push with --disable-content-trust:"))
}
func (s *DockerTrustSuite) TestTrustedPushWithExistingTag(c *check.C) {
repoName := fmt.Sprintf("%v/dockerclitag/trusted:latest", privateRegistryURL)
// tag the image and upload it to the private registry
dockerCmd(c, "tag", "busybox", repoName)
dockerCmd(c, "push", repoName)
pushCmd := exec.Command(dockerBinary, "push", repoName)
s.trustedCmd(pushCmd)
out, _, err := runCommandWithOutput(pushCmd)
c.Assert(err, check.IsNil, check.Commentf("trusted push failed: %s\n%s", err, out))
c.Assert(out, checker.Contains, "Signing and pushing trust metadata", check.Commentf("Missing expected output on trusted push with existing tag"))
// Try pull after push
pullCmd := exec.Command(dockerBinary, "pull", repoName)
s.trustedCmd(pullCmd)
out, _, err = runCommandWithOutput(pullCmd)
c.Assert(err, check.IsNil, check.Commentf(out))
c.Assert(string(out), checker.Contains, "Status: Downloaded", check.Commentf(out))
}
func (s *DockerTrustSuite) TestTrustedPushWithExistingSignedTag(c *check.C) {
repoName := fmt.Sprintf("%v/dockerclipushpush/trusted:latest", privateRegistryURL)
// tag the image and upload it to the private registry
dockerCmd(c, "tag", "busybox", repoName)
// Do a trusted push
pushCmd := exec.Command(dockerBinary, "push", repoName)
s.trustedCmd(pushCmd)
out, _, err := runCommandWithOutput(pushCmd)
c.Assert(err, check.IsNil, check.Commentf("trusted push failed: %s\n%s", err, out))
c.Assert(out, checker.Contains, "Signing and pushing trust metadata", check.Commentf("Missing expected output on trusted push with existing tag"))
// Do another trusted push
pushCmd = exec.Command(dockerBinary, "push", repoName)
s.trustedCmd(pushCmd)
out, _, err = runCommandWithOutput(pushCmd)
c.Assert(err, check.IsNil, check.Commentf("trusted push failed: %s\n%s", err, out))
c.Assert(out, checker.Contains, "Signing and pushing trust metadata", check.Commentf("Missing expected output on trusted push with existing tag"))
dockerCmd(c, "rmi", repoName)
// Try pull to ensure the double push did not break our ability to pull
pullCmd := exec.Command(dockerBinary, "pull", repoName)
s.trustedCmd(pullCmd)
out, _, err = runCommandWithOutput(pullCmd)
c.Assert(err, check.IsNil, check.Commentf("Error running trusted pull: %s\n%s", err, out))
c.Assert(out, checker.Contains, "Status: Downloaded", check.Commentf("Missing expected output on trusted pull with --disable-content-trust"))
}
func (s *DockerTrustSuite) TestTrustedPushWithIncorrectPassphraseForNonRoot(c *check.C) {
repoName := fmt.Sprintf("%v/dockercliincorretpwd/trusted:latest", privateRegistryURL)
// tag the image and upload it to the private registry
dockerCmd(c, "tag", "busybox", repoName)
// Push with default passphrases
pushCmd := exec.Command(dockerBinary, "push", repoName)
s.trustedCmd(pushCmd)
out, _, err := runCommandWithOutput(pushCmd)
c.Assert(err, check.IsNil, check.Commentf("trusted push failed: %s\n%s", err, out))
c.Assert(out, checker.Contains, "Signing and pushing trust metadata", check.Commentf("Missing expected output on trusted push:\n%s", out))
// Push with wrong passphrases
pushCmd = exec.Command(dockerBinary, "push", repoName)
s.trustedCmdWithPassphrases(pushCmd, "12345678", "87654321")
out, _, err = runCommandWithOutput(pushCmd)
c.Assert(err, check.NotNil, check.Commentf("Error missing from trusted push with short targets passphrase: \n%s", out))
c.Assert(out, checker.Contains, "could not find necessary signing keys", check.Commentf("Missing expected output on trusted push with short targets/snapsnot passphrase"))
}
// This test ensures backwards compatibility with old ENV variables. Should be
// deprecated by 1.10
func (s *DockerTrustSuite) TestTrustedPushWithIncorrectDeprecatedPassphraseForNonRoot(c *check.C) {
repoName := fmt.Sprintf("%v/dockercliincorretdeprecatedpwd/trusted:latest", privateRegistryURL)
// tag the image and upload it to the private registry
dockerCmd(c, "tag", "busybox", repoName)
// Push with default passphrases
pushCmd := exec.Command(dockerBinary, "push", repoName)
s.trustedCmd(pushCmd)
out, _, err := runCommandWithOutput(pushCmd)
c.Assert(err, check.IsNil, check.Commentf("trusted push failed: %s\n%s", err, out))
c.Assert(out, checker.Contains, "Signing and pushing trust metadata", check.Commentf("Missing expected output on trusted push"))
// Push with wrong passphrases
pushCmd = exec.Command(dockerBinary, "push", repoName)
s.trustedCmdWithDeprecatedEnvPassphrases(pushCmd, "12345678", "87654321")
out, _, err = runCommandWithOutput(pushCmd)
c.Assert(err, check.NotNil, check.Commentf("Error missing from trusted push with short targets passphrase: \n%s", out))
c.Assert(out, checker.Contains, "could not find necessary signing keys", check.Commentf("Missing expected output on trusted push with short targets/snapsnot passphrase"))
}
func (s *DockerTrustSuite) TestTrustedPushWithExpiredSnapshot(c *check.C) {
c.Skip("Currently changes system time, causing instability")
repoName := fmt.Sprintf("%v/dockercliexpiredsnapshot/trusted:latest", privateRegistryURL)
// tag the image and upload it to the private registry
dockerCmd(c, "tag", "busybox", repoName)
// Push with default passphrases
pushCmd := exec.Command(dockerBinary, "push", repoName)
s.trustedCmd(pushCmd)
out, _, err := runCommandWithOutput(pushCmd)
c.Assert(err, check.IsNil, check.Commentf("trusted push failed: %s\n%s", err, out))
c.Assert(out, checker.Contains, "Signing and pushing trust metadata", check.Commentf("Missing expected output on trusted push"))
// Snapshots last for three years. This should be expired
fourYearsLater := time.Now().Add(time.Hour * 24 * 365 * 4)
runAtDifferentDate(fourYearsLater, func() {
// Push with wrong passphrases
pushCmd = exec.Command(dockerBinary, "push", repoName)
s.trustedCmd(pushCmd)
out, _, err = runCommandWithOutput(pushCmd)
c.Assert(err, check.NotNil, check.Commentf("Error missing from trusted push with expired snapshot: \n%s", out))
c.Assert(out, checker.Contains, "repository out-of-date", check.Commentf("Missing expected output on trusted push with expired snapshot"))
})
}
func (s *DockerTrustSuite) TestTrustedPushWithExpiredTimestamp(c *check.C) {
c.Skip("Currently changes system time, causing instability")
repoName := fmt.Sprintf("%v/dockercliexpiredtimestamppush/trusted:latest", privateRegistryURL)
// tag the image and upload it to the private registry
dockerCmd(c, "tag", "busybox", repoName)
// Push with default passphrases
pushCmd := exec.Command(dockerBinary, "push", repoName)
s.trustedCmd(pushCmd)
out, _, err := runCommandWithOutput(pushCmd)
c.Assert(err, check.IsNil, check.Commentf("trusted push failed: %s\n%s", err, out))
c.Assert(out, checker.Contains, "Signing and pushing trust metadata", check.Commentf("Missing expected output on trusted push"))
// The timestamps expire in two weeks. Lets check three
threeWeeksLater := time.Now().Add(time.Hour * 24 * 21)
// Should succeed because the server transparently re-signs one
runAtDifferentDate(threeWeeksLater, func() {
pushCmd := exec.Command(dockerBinary, "push", repoName)
s.trustedCmd(pushCmd)
out, _, err := runCommandWithOutput(pushCmd)
c.Assert(err, check.IsNil, check.Commentf("Error running trusted push: %s\n%s", err, out))
c.Assert(out, checker.Contains, "Signing and pushing trust metadata", check.Commentf("Missing expected output on trusted push with expired timestamp"))
})
}
func (s *DockerTrustSuite) TestTrustedPushWithReleasesDelegation(c *check.C) {
repoName := fmt.Sprintf("%v/dockerclireleasedelegation/trusted", privateRegistryURL)
targetName := fmt.Sprintf("%s:latest", repoName)
pwd := "12345678"
s.setupDelegations(c, repoName, pwd)
// tag the image and upload it to the private registry
dockerCmd(c, "tag", "busybox", targetName)
pushCmd := exec.Command(dockerBinary, "-D", "push", targetName)
s.trustedCmdWithPassphrases(pushCmd, pwd, pwd)
out, _, err := runCommandWithOutput(pushCmd)
c.Assert(err, check.IsNil, check.Commentf("trusted push failed: %s\n%s", err, out))
c.Assert(out, checker.Contains, "Signing and pushing trust metadata", check.Commentf("Missing expected output on trusted push with existing tag"))
// Try pull after push
pullCmd := exec.Command(dockerBinary, "pull", targetName)
s.trustedCmd(pullCmd)
out, _, err = runCommandWithOutput(pullCmd)
c.Assert(err, check.IsNil, check.Commentf(out))
c.Assert(string(out), checker.Contains, "Status: Downloaded", check.Commentf(out))
// check to make sure that the target has been added to targets/releases and not targets
contents, err := ioutil.ReadFile(filepath.Join(cliconfig.ConfigDir(), "trust/tuf", repoName, "metadata/targets.json"))
c.Assert(err, check.IsNil, check.Commentf("Unable to read targets metadata"))
c.Assert(strings.Contains(string(contents), `"latest"`), checker.False, check.Commentf(string(contents)))
contents, err = ioutil.ReadFile(filepath.Join(cliconfig.ConfigDir(), "trust/tuf", repoName, "metadata/targets/releases.json"))
c.Assert(err, check.IsNil, check.Commentf("Unable to read targets/releases metadata"))
c.Assert(string(contents), checker.Contains, `"latest"`, check.Commentf(string(contents)))
}