moby/integration-cli/docker_cli_experimental_test.go

// +build experimental

package main

import (
	"fmt"
	"io/ioutil"
	"os"
	"os/exec"
	"path/filepath"
	"strconv"
	"strings"

	"github.com/docker/docker/pkg/system"
	"github.com/go-check/check"
)

func (s *DockerSuite) TestExperimentalVersion(c *check.C) {
	out, _ := dockerCmd(c, "version")
	for _, line := range strings.Split(out, "\n") {
		if strings.HasPrefix(line, "Experimental (client):") || strings.HasPrefix(line, "Experimental (server):") {
			c.Assert(line, check.Matches, "*true")
		}
	}

	out, _ = dockerCmd(c, "-v")
	if !strings.Contains(out, ", experimental") {
		c.Fatalf("docker version did not contain experimental: %s", out)
	}
}

// user namespaces test: run daemon with remapped root setting
// 1. validate uid/gid maps are set properly
// 2. verify that files created are owned by remapped root
func (s *DockerDaemonSuite) TestDaemonUserNamespaceRootSetting(c *check.C) {
	testRequires(c, NativeExecDriver)
	testRequires(c, SameHostDaemon)

	c.Assert(s.d.StartWithBusybox("--userns-remap", "default"), check.IsNil)

	tmpDir, err := ioutil.TempDir("", "userns")
	if err != nil {
		c.Fatal(err)
	}
	defer os.RemoveAll(tmpDir)

	// we need to find the uid and gid of the remapped root from the daemon's root dir info
	uidgid := strings.Split(filepath.Base(s.d.root), ".")
	c.Assert(len(uidgid), check.Equals, 2, check.Commentf("Should have gotten uid/gid strings from root dirname: %s", filepath.Base(s.d.root)))
	uid, err := strconv.Atoi(uidgid[0])
	c.Assert(err, check.IsNil, check.Commentf("Can't parse uid: %v", err))
	gid, err := strconv.Atoi(uidgid[1])
	c.Assert(err, check.IsNil, check.Commentf("Can't parse gid: %v", err))

	//writeable by the remapped root UID/GID pair
	c.Assert(os.Chown(tmpDir, uid, gid), check.IsNil)

	out, err := s.d.Cmd("run", "-d", "--name", "userns", "-v", tmpDir+":/goofy", "busybox", "sh", "-c", "touch /goofy/testfile; top")
	c.Assert(err, check.IsNil, check.Commentf("Output: %s", out))

	pid, err := s.d.Cmd("inspect", "--format='{{.State.Pid}}'", "userns")
	if err != nil {
		c.Fatalf("Could not inspect running container: out: %q; err: %v", pid, err)
	}
	// check the uid and gid maps for the PID to ensure root is remapped
	// (cmd = cat /proc/<pid>/uid_map | grep -E '0\s+9999\s+1')
	out, rc1, err := runCommandPipelineWithOutput(
		exec.Command("cat", "/proc/"+strings.TrimSpace(pid)+"/uid_map"),
		exec.Command("grep", "-E", fmt.Sprintf("0[[:space:]]+%d[[:space:]]+", uid)))
	c.Assert(rc1, check.Equals, 0, check.Commentf("Didn't match uid_map: output: %s", out))

	out, rc2, err := runCommandPipelineWithOutput(
		exec.Command("cat", "/proc/"+strings.TrimSpace(pid)+"/gid_map"),
		exec.Command("grep", "-E", fmt.Sprintf("0[[:space:]]+%d[[:space:]]+", gid)))
	c.Assert(rc2, check.Equals, 0, check.Commentf("Didn't match gid_map: output: %s", out))

	// check that the touched file is owned by remapped uid:gid
	stat, err := system.Stat(filepath.Join(tmpDir, "testfile"))
	if err != nil {
		c.Fatal(err)
	}
	c.Assert(stat.UID(), check.Equals, uint32(uid), check.Commentf("Touched file not owned by remapped root UID"))
	c.Assert(stat.Gid(), check.Equals, uint32(gid), check.Commentf("Touched file not owned by remapped root GID"))
}