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package main
import (
"encoding/json"
"fmt"
"regexp"
"sort"
"strings"
"testing"
"github.com/docker/docker/runconfig"
"gotest.tools/v3/assert"
is "gotest.tools/v3/assert/cmp"
)
type DockerCLILinksSuite struct {
ds *DockerSuite
}
func (s *DockerCLILinksSuite) TearDownTest(c *testing.T) {
s.ds.TearDownTest(c)
}
func (s *DockerCLILinksSuite) OnTimeout(c *testing.T) {
s.ds.OnTimeout(c)
}
func (s *DockerCLILinksSuite) TestLinksPingUnlinkedContainers(c *testing.T) {
testRequires(c, DaemonIsLinux)
_, exitCode, err := dockerCmdWithError("run", "--rm", "busybox", "sh", "-c", "ping -c 1 alias1 -W 1 && ping -c 1 alias2 -W 1")
// run ping failed with error
assert.Equal(c, exitCode, 1, fmt.Sprintf("error: %v", err))
}
// Test for appropriate error when calling --link with an invalid target container
func (s *DockerCLILinksSuite) TestLinksInvalidContainerTarget(c *testing.T) {
testRequires(c, DaemonIsLinux)
out, _, err := dockerCmdWithError("run", "--link", "bogus:alias", "busybox", "true")
// an invalid container target should produce an error
assert.Check(c, is.ErrorContains(err, "could not get container for bogus"))
assert.Check(c, is.Contains(out, "could not get container"))
}
func (s *DockerCLILinksSuite) TestLinksPingLinkedContainers(c *testing.T) {
testRequires(c, DaemonIsLinux)
// Test with the three different ways of specifying the default network on Linux
testLinkPingOnNetwork(c, "")
testLinkPingOnNetwork(c, "default")
testLinkPingOnNetwork(c, "bridge")
}
func testLinkPingOnNetwork(c *testing.T, network string) {
var postArgs []string
if network != "" {
postArgs = append(postArgs, []string{"--net", network}...)
}
postArgs = append(postArgs, []string{"busybox", "top"}...)
runArgs1 := append([]string{"run", "-d", "--name", "container1", "--hostname", "fred"}, postArgs...)
runArgs2 := append([]string{"run", "-d", "--name", "container2", "--hostname", "wilma"}, postArgs...)
// Run the two named containers
dockerCmd(c, runArgs1...)
dockerCmd(c, runArgs2...)
postArgs = []string{}
if network != "" {
postArgs = append(postArgs, []string{"--net", network}...)
}
postArgs = append(postArgs, []string{"busybox", "sh", "-c"}...)
// Format a run for a container which links to the other two
runArgs := append([]string{"run", "--rm", "--link", "container1:alias1", "--link", "container2:alias2"}, postArgs...)
pingCmd := "ping -c 1 %s -W 1 && ping -c 1 %s -W 1"
// test ping by alias, ping by name, and ping by hostname
// 1. Ping by alias
dockerCmd(c, append(runArgs, fmt.Sprintf(pingCmd, "alias1", "alias2"))...)
// 2. Ping by container name
dockerCmd(c, append(runArgs, fmt.Sprintf(pingCmd, "container1", "container2"))...)
// 3. Ping by hostname
dockerCmd(c, append(runArgs, fmt.Sprintf(pingCmd, "fred", "wilma"))...)
// Clean for next round
dockerCmd(c, "rm", "-f", "container1")
dockerCmd(c, "rm", "-f", "container2")
}
func (s *DockerCLILinksSuite) TestLinksPingLinkedContainersAfterRename(c *testing.T) {
testRequires(c, DaemonIsLinux)
out, _ := dockerCmd(c, "run", "-d", "--name", "container1", "busybox", "top")
idA := strings.TrimSpace(out)
out, _ = dockerCmd(c, "run", "-d", "--name", "container2", "busybox", "top")
idB := strings.TrimSpace(out)
dockerCmd(c, "rename", "container1", "container_new")
dockerCmd(c, "run", "--rm", "--link", "container_new:alias1", "--link", "container2:alias2", "busybox", "sh", "-c", "ping -c 1 alias1 -W 1 && ping -c 1 alias2 -W 1")
dockerCmd(c, "kill", idA)
dockerCmd(c, "kill", idB)
}
func (s *DockerCLILinksSuite) TestLinksInspectLinksStarted(c *testing.T) {
testRequires(c, DaemonIsLinux)
dockerCmd(c, "run", "-d", "--name", "container1", "busybox", "top")
dockerCmd(c, "run", "-d", "--name", "container2", "busybox", "top")
dockerCmd(c, "run", "-d", "--name", "testinspectlink", "--link", "container1:alias1", "--link", "container2:alias2", "busybox", "top")
links := inspectFieldJSON(c, "testinspectlink", "HostConfig.Links")
var result []string
err := json.Unmarshal([]byte(links), &result)
assert.NilError(c, err)
var expected = []string{
"/container1:/testinspectlink/alias1",
"/container2:/testinspectlink/alias2",
}
sort.Strings(result)
assert.DeepEqual(c, result, expected)
}
func (s *DockerCLILinksSuite) TestLinksInspectLinksStopped(c *testing.T) {
testRequires(c, DaemonIsLinux)
dockerCmd(c, "run", "-d", "--name", "container1", "busybox", "top")
dockerCmd(c, "run", "-d", "--name", "container2", "busybox", "top")
dockerCmd(c, "run", "-d", "--name", "testinspectlink", "--link", "container1:alias1", "--link", "container2:alias2", "busybox", "true")
links := inspectFieldJSON(c, "testinspectlink", "HostConfig.Links")
var result []string
err := json.Unmarshal([]byte(links), &result)
assert.NilError(c, err)
var expected = []string{
"/container1:/testinspectlink/alias1",
"/container2:/testinspectlink/alias2",
}
sort.Strings(result)
assert.DeepEqual(c, result, expected)
}
func (s *DockerCLILinksSuite) TestLinksNotStartedParentNotFail(c *testing.T) {
testRequires(c, DaemonIsLinux)
dockerCmd(c, "create", "--name=first", "busybox", "top")
dockerCmd(c, "create", "--name=second", "--link=first:first", "busybox", "top")
dockerCmd(c, "start", "first")
}
func (s *DockerCLILinksSuite) TestLinksHostsFilesInject(c *testing.T) {
testRequires(c, DaemonIsLinux)
testRequires(c, testEnv.IsLocalDaemon)
out, _ := dockerCmd(c, "run", "-itd", "--name", "one", "busybox", "top")
idOne := strings.TrimSpace(out)
out, _ = dockerCmd(c, "run", "-itd", "--name", "two", "--link", "one:onetwo", "busybox", "top")
idTwo := strings.TrimSpace(out)
assert.Assert(c, waitRun(idTwo) == nil)
readContainerFileWithExec(c, idOne, "/etc/hosts")
contentTwo := readContainerFileWithExec(c, idTwo, "/etc/hosts")
// Host is not present in updated hosts file
assert.Assert(c, is.Contains(string(contentTwo), "onetwo"))
}
func (s *DockerCLILinksSuite) TestLinksUpdateOnRestart(c *testing.T) {
testRequires(c, DaemonIsLinux)
testRequires(c, testEnv.IsLocalDaemon)
dockerCmd(c, "run", "-d", "--name", "one", "busybox", "top")
out, _ := dockerCmd(c, "run", "-d", "--name", "two", "--link", "one:onetwo", "--link", "one:one", "busybox", "top")
id := strings.TrimSpace(out)
realIP := inspectField(c, "one", "NetworkSettings.Networks.bridge.IPAddress")
content := readContainerFileWithExec(c, id, "/etc/hosts")
getIP := func(hosts []byte, hostname string) string {
re := regexp.MustCompile(fmt.Sprintf(`(\S*)\t%s`, regexp.QuoteMeta(hostname)))
matches := re.FindSubmatch(hosts)
assert.Assert(c, matches != nil, "Hostname %s have no matches in hosts", hostname)
return string(matches[1])
}
ip := getIP(content, "one")
assert.Check(c, is.Equal(ip, realIP))
ip = getIP(content, "onetwo")
assert.Check(c, is.Equal(ip, realIP))
dockerCmd(c, "restart", "one")
realIP = inspectField(c, "one", "NetworkSettings.Networks.bridge.IPAddress")
content = readContainerFileWithExec(c, id, "/etc/hosts")
ip = getIP(content, "one")
assert.Check(c, is.Equal(ip, realIP))
ip = getIP(content, "onetwo")
assert.Check(c, is.Equal(ip, realIP))
}
func (s *DockerCLILinksSuite) TestLinksEnvs(c *testing.T) {
testRequires(c, DaemonIsLinux)
dockerCmd(c, "run", "-d", "-e", "e1=", "-e", "e2=v2", "-e", "e3=v3=v3", "--name=first", "busybox", "top")
out, _ := dockerCmd(c, "run", "--name=second", "--link=first:first", "busybox", "env")
assert.Assert(c, is.Contains(out, "FIRST_ENV_e1=\n"))
assert.Assert(c, is.Contains(out, "FIRST_ENV_e2=v2"))
assert.Assert(c, is.Contains(out, "FIRST_ENV_e3=v3=v3"))
}
func (s *DockerCLILinksSuite) TestLinkShortDefinition(c *testing.T) {
testRequires(c, DaemonIsLinux)
out, _ := dockerCmd(c, "run", "-d", "--name", "shortlinkdef", "busybox", "top")
cid := strings.TrimSpace(out)
assert.Assert(c, waitRun(cid) == nil)
out, _ = dockerCmd(c, "run", "-d", "--name", "link2", "--link", "shortlinkdef", "busybox", "top")
cid2 := strings.TrimSpace(out)
assert.Assert(c, waitRun(cid2) == nil)
links := inspectFieldJSON(c, cid2, "HostConfig.Links")
assert.Equal(c, links, "[\"/shortlinkdef:/link2/shortlinkdef\"]")
}
func (s *DockerCLILinksSuite) TestLinksNetworkHostContainer(c *testing.T) {
testRequires(c, DaemonIsLinux, NotUserNamespace)
dockerCmd(c, "run", "-d", "--net", "host", "--name", "host_container", "busybox", "top")
out, _, err := dockerCmdWithError("run", "--name", "should_fail", "--link", "host_container:tester", "busybox", "true")
// Running container linking to a container with --net host should have failed
assert.Check(c, err != nil, "out: %s", out)
// Running container linking to a container with --net host should have failed
assert.Check(c, is.Contains(out, runconfig.ErrConflictHostNetworkAndLinks.Error()))
}
func (s *DockerCLILinksSuite) TestLinksEtcHostsRegularFile(c *testing.T) {
testRequires(c, DaemonIsLinux, NotUserNamespace)
out, _ := dockerCmd(c, "run", "--net=host", "busybox", "ls", "-la", "/etc/hosts")
// /etc/hosts should be a regular file
assert.Assert(c, is.Regexp("^-.+\n$", out))
}
func (s *DockerCLILinksSuite) TestLinksMultipleWithSameName(c *testing.T) {
testRequires(c, DaemonIsLinux)
dockerCmd(c, "run", "-d", "--name=upstream-a", "busybox", "top")
dockerCmd(c, "run", "-d", "--name=upstream-b", "busybox", "top")
dockerCmd(c, "run", "--link", "upstream-a:upstream", "--link", "upstream-b:upstream", "busybox", "sh", "-c", "ping -c 1 upstream")
}
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