// +build !windows
 
 package main
 
 import (
 	"fmt"
 	"io/ioutil"
 	"os"
 	"os/exec"

 	"path"

 	"path/filepath"
 	"strconv"
 	"strings"
 

 	"github.com/docker/docker/integration-cli/checker"

 	"github.com/docker/docker/pkg/stringid"

 	"github.com/docker/docker/pkg/system"
 	"github.com/go-check/check"
 )
 
 // 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, DaemonIsLinux, SameHostDaemon, UserNamespaceInKernel)

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

 
 	tmpDir, err := ioutil.TempDir("", "userns")
 	c.Assert(err, checker.IsNil)
 
 	defer os.RemoveAll(tmpDir)
 

 	// Set a non-existent path
 	tmpDirNotExists := path.Join(os.TempDir(), "userns"+stringid.GenerateRandomID())
 	defer os.RemoveAll(tmpDirNotExists)
 

 	// 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(uidgid, checker.HasLen, 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, checker.IsNil, check.Commentf("Can't parse uid"))
 	gid, err := strconv.Atoi(uidgid[1])
 	c.Assert(err, checker.IsNil, check.Commentf("Can't parse gid"))
 

 	// writable by the remapped root UID/GID pair

 	c.Assert(os.Chown(tmpDir, uid, gid), checker.IsNil)
 

 	out, err := s.d.Cmd("run", "-d", "--name", "userns", "-v", tmpDir+":/goofy", "-v", tmpDirNotExists+":/donald", "busybox", "sh", "-c", "touch /goofy/testfile; top")

 	c.Assert(err, checker.IsNil, check.Commentf("Output: %s", out))

 	user := s.findUser(c, "userns")
 	c.Assert(uidgid[0], checker.Equals, user)

 	// check that the created directory is owned by remapped uid:gid
 	statNotExists, err := system.Stat(tmpDirNotExists)
 	c.Assert(err, checker.IsNil)
 	c.Assert(statNotExists.UID(), checker.Equals, uint32(uid), check.Commentf("Created directory not owned by remapped root UID"))
 	c.Assert(statNotExists.GID(), checker.Equals, uint32(gid), check.Commentf("Created directory not owned by remapped root GID"))
 

 	pid, err := s.d.Cmd("inspect", "--format={{.State.Pid}}", "userns")

 	c.Assert(err, checker.IsNil, check.Commentf("Could not inspect running container: out: %q", pid))
 	// 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, err = RunCommandPipelineWithOutput(

 		exec.Command("cat", "/proc/"+strings.TrimSpace(pid)+"/uid_map"),
 		exec.Command("grep", "-E", fmt.Sprintf("0[[:space:]]+%d[[:space:]]+", uid)))

 	c.Assert(err, check.IsNil)

 	out, err = RunCommandPipelineWithOutput(

 		exec.Command("cat", "/proc/"+strings.TrimSpace(pid)+"/gid_map"),
 		exec.Command("grep", "-E", fmt.Sprintf("0[[:space:]]+%d[[:space:]]+", gid)))

 	c.Assert(err, check.IsNil)

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

 
 	// use host usernamespace
 	out, err = s.d.Cmd("run", "-d", "--name", "userns_skip", "--userns", "host", "busybox", "sh", "-c", "touch /goofy/testfile; top")
 	c.Assert(err, checker.IsNil, check.Commentf("Output: %s", out))
 	user = s.findUser(c, "userns_skip")
 	// userns are skipped, user is root
 	c.Assert(user, checker.Equals, "root")
 }
 
 // findUser finds the uid or name of the user of the first process that runs in a container
 func (s *DockerDaemonSuite) findUser(c *check.C, container string) string {
 	out, err := s.d.Cmd("top", container)
 	c.Assert(err, checker.IsNil, check.Commentf("Output: %s", out))
 	rows := strings.Split(out, "\n")
 	if len(rows) < 2 {
 		// No process rows founds
 		c.FailNow()
 	}
 	return strings.Fields(rows[1])[0]

 }