Golang Spec.Hostname方法代碼示例

func (daemon *Daemon) populateCommonSpec(s *specs.Spec, c *container.Container) error {
	linkedEnv, err := daemon.setupLinkedContainers(c)
	if err != nil {
		return err
	}
	s.Root = specs.Root{
		Path:     c.BaseFS,
		Readonly: c.HostConfig.ReadonlyRootfs,
	}
	rootUID, rootGID := daemon.GetRemappedUIDGID()
	if err := c.SetupWorkingDirectory(rootUID, rootGID); err != nil {
		return err
	}
	cwd := c.Config.WorkingDir
	if len(cwd) == 0 {
		cwd = "/"
	}
	s.Process.Args = append([]string{c.Path}, c.Args...)

	// only add the custom init if it is specified and the container is running in its
	// own private pid namespace.  It does not make sense to add if it is running in the
	// host namespace or another container's pid namespace where we already have an init
	if c.HostConfig.PidMode.IsPrivate() {
		if (c.HostConfig.Init != nil && *c.HostConfig.Init) ||
			(c.HostConfig.Init == nil && daemon.configStore.Init) {
			s.Process.Args = append([]string{"/dev/init", c.Path}, c.Args...)
			var path string
			if daemon.configStore.InitPath == "" && c.HostConfig.InitPath == "" {
				path, err = exec.LookPath(DefaultInitBinary)
				if err != nil {
					return err
				}
			}
			if daemon.configStore.InitPath != "" {
				path = daemon.configStore.InitPath
			}
			if c.HostConfig.InitPath != "" {
				path = c.HostConfig.InitPath
			}
			s.Mounts = append(s.Mounts, specs.Mount{
				Destination: "/dev/init",
				Type:        "bind",
				Source:      path,
				Options:     []string{"bind", "ro"},
			})
		}
	}
	s.Process.Cwd = cwd
	s.Process.Env = c.CreateDaemonEnvironment(c.Config.Tty, linkedEnv)
	s.Process.Terminal = c.Config.Tty
	s.Hostname = c.FullHostname()

	return nil
}

func setNamespaces(daemon *Daemon, s *specs.Spec, c *container.Container) error {
	userNS := false
	// user
	if c.HostConfig.UsernsMode.IsPrivate() {
		uidMap, gidMap := daemon.GetUIDGIDMaps()
		if uidMap != nil {
			userNS = true
			ns := specs.Namespace{Type: "user"}
			setNamespace(s, ns)
			s.Linux.UIDMappings = specMapping(uidMap)
			s.Linux.GIDMappings = specMapping(gidMap)
		}
	}
	// network
	if !c.Config.NetworkDisabled {
		ns := specs.Namespace{Type: "network"}
		parts := strings.SplitN(string(c.HostConfig.NetworkMode), ":", 2)
		if parts[0] == "container" {
			nc, err := daemon.getNetworkedContainer(c.ID, c.HostConfig.NetworkMode.ConnectedContainer())
			if err != nil {
				return err
			}
			ns.Path = fmt.Sprintf("/proc/%d/ns/net", nc.State.GetPID())
			if userNS {
				// to share a net namespace, they must also share a user namespace
				nsUser := specs.Namespace{Type: "user"}
				nsUser.Path = fmt.Sprintf("/proc/%d/ns/user", nc.State.GetPID())
				setNamespace(s, nsUser)
			}
		} else if c.HostConfig.NetworkMode.IsHost() {
			ns.Path = c.NetworkSettings.SandboxKey
		}
		setNamespace(s, ns)
	}
	// ipc
	if c.HostConfig.IpcMode.IsContainer() {
		ns := specs.Namespace{Type: "ipc"}
		ic, err := daemon.getIpcContainer(c)
		if err != nil {
			return err
		}
		ns.Path = fmt.Sprintf("/proc/%d/ns/ipc", ic.State.GetPID())
		setNamespace(s, ns)
		if userNS {
			// to share an IPC namespace, they must also share a user namespace
			nsUser := specs.Namespace{Type: "user"}
			nsUser.Path = fmt.Sprintf("/proc/%d/ns/user", ic.State.GetPID())
			setNamespace(s, nsUser)
		}
	} else if c.HostConfig.IpcMode.IsHost() {
		oci.RemoveNamespace(s, specs.NamespaceType("ipc"))
	} else {
		ns := specs.Namespace{Type: "ipc"}
		setNamespace(s, ns)
	}
	// pid
	if c.HostConfig.PidMode.IsContainer() {
		ns := specs.Namespace{Type: "pid"}
		pc, err := daemon.getPidContainer(c)
		if err != nil {
			return err
		}
		ns.Path = fmt.Sprintf("/proc/%d/ns/pid", pc.State.GetPID())
		setNamespace(s, ns)
		if userNS {
			// to share a PID namespace, they must also share a user namespace
			nsUser := specs.Namespace{Type: "user"}
			nsUser.Path = fmt.Sprintf("/proc/%d/ns/user", pc.State.GetPID())
			setNamespace(s, nsUser)
		}
	} else if c.HostConfig.PidMode.IsHost() {
		oci.RemoveNamespace(s, specs.NamespaceType("pid"))
	} else {
		ns := specs.Namespace{Type: "pid"}
		setNamespace(s, ns)
	}
	// uts
	if c.HostConfig.UTSMode.IsHost() {
		oci.RemoveNamespace(s, specs.NamespaceType("uts"))
		s.Hostname = ""
	}

	return nil
}