Golang shared.LogPath函数代码示例

/*
 * This is called by lxd when called as "lxd forkstart <container>"
 * 'forkstart' is used instead of just 'start' in the hopes that people
 * do not accidentally type 'lxd start' instead of 'lxc start'
 *
 * We expect to read the lxcconfig over fd 3.
 */
func startContainer(args []string) error {
	if len(args) != 4 {
		return fmt.Errorf("Bad arguments: %q\n", args)
	}
	name := args[1]
	lxcpath := args[2]
	configPath := args[3]

	c, err := lxc.NewContainer(name, lxcpath)
	if err != nil {
		return fmt.Errorf("Error initializing container for start: %q", err)
	}
	err = c.LoadConfigFile(configPath)
	if err != nil {
		return fmt.Errorf("Error opening startup config file: %q", err)
	}

	err = c.Start()
	if err != nil {
		os.Remove(configPath)
	} else {
		shared.FileMove(configPath, shared.LogPath(name, "lxc.conf"))
	}

	return err
}

func containerLogsGet(d *Daemon, r *http.Request) Response {
	/* Let's explicitly *not* try to do a containerLoadByName here. In some
	 * cases (e.g. when container creation failed), the container won't
	 * exist in the DB but it does have some log files on disk.
	 *
	 * However, we should check this name and ensure it's a valid container
	 * name just so that people can't list arbitrary directories.
	 */
	name := mux.Vars(r)["name"]

	if err := containerValidName(name); err != nil {
		return BadRequest(err)
	}

	result := []string{}

	dents, err := ioutil.ReadDir(shared.LogPath(name))
	if err != nil {
		return SmartError(err)
	}

	for _, f := range dents {
		result = append(result, fmt.Sprintf("/%s/containers/%s/logs/%s", shared.APIVersion, name, f.Name()))
	}

	return SyncResponse(true, result)
}

func containerLogsGet(d *Daemon, r *http.Request) Response {
	/* Let's explicitly *not* try to do a containerLXDLoad here. In some
	 * cases (e.g. when container creation failed), the container won't
	 * exist in the DB but it does have some log files on disk.
	 *
	 * However, we should check this name and ensure it's a valid container
	 * name just so that people can't list arbitrary directories.
	 */
	name := mux.Vars(r)["name"]

	if err := validContainerName(name); err != nil {
		return BadRequest(err)
	}

	result := []map[string]interface{}{}

	dents, err := ioutil.ReadDir(shared.LogPath(name))
	if err != nil {
		return SmartError(err)
	}

	for _, f := range dents {
		result = append(result, map[string]interface{}{
			"name": f.Name(),
			"size": f.Size(),
		})
	}

	return SyncResponse(true, result)
}

/*
 * This is called by lxd when called as "lxd forkstart <container>"
 * 'forkstart' is used instead of just 'start' in the hopes that people
 * do not accidentally type 'lxd start' instead of 'lxc start'
 *
 * We expect to read the lxcconfig over fd 3.
 */
func startContainer(args []string) error {
	if len(args) != 4 {
		return fmt.Errorf("Bad arguments: %q", args)
	}
	name := args[1]
	lxcpath := args[2]
	configPath := args[3]

	c, err := lxc.NewContainer(name, lxcpath)
	if err != nil {
		return fmt.Errorf("Error initializing container for start: %q", err)
	}
	err = c.LoadConfigFile(configPath)
	if err != nil {
		return fmt.Errorf("Error opening startup config file: %q", err)
	}

	/* due to https://github.com/golang/go/issues/13155 and the
	 * CollectOutput call we make for the forkstart process, we need to
	 * close our stdin/stdout/stderr here. Collecting some of the logs is
	 * better than collecting no logs, though.
	 */
	os.Stdin.Close()
	os.Stderr.Close()
	os.Stdout.Close()
	err = c.Start()
	if err != nil {
		os.Remove(configPath)
	} else {
		shared.FileMove(configPath, shared.LogPath(name, "lxc.conf"))
	}

	return err
}

/*
 * This is called by lxd when called as "lxd forkstart <container>"
 * 'forkstart' is used instead of just 'start' in the hopes that people
 * do not accidentally type 'lxd start' instead of 'lxc start'
 *
 * We expect to read the lxcconfig over fd 3.
 */
func startContainer(args []string) error {
	if len(args) != 4 {
		return fmt.Errorf("Bad arguments: %q", args)
	}

	name := args[1]
	lxcpath := args[2]
	configPath := args[3]

	c, err := lxc.NewContainer(name, lxcpath)
	if err != nil {
		return fmt.Errorf("Error initializing container for start: %q", err)
	}

	err = c.LoadConfigFile(configPath)
	if err != nil {
		return fmt.Errorf("Error opening startup config file: %q", err)
	}

	/* due to https://github.com/golang/go/issues/13155 and the
	 * CollectOutput call we make for the forkstart process, we need to
	 * close our stdin/stdout/stderr here. Collecting some of the logs is
	 * better than collecting no logs, though.
	 */
	os.Stdin.Close()
	os.Stderr.Close()
	os.Stdout.Close()

	// Redirect stdout and stderr to a log file
	logPath := shared.LogPath(name, "forkstart.log")
	if shared.PathExists(logPath) {
		os.Remove(logPath)
	}

	logFile, err := os.OpenFile(logPath, os.O_WRONLY|os.O_CREATE|os.O_SYNC, 0644)
	if err == nil {
		syscall.Dup3(int(logFile.Fd()), 1, 0)
		syscall.Dup3(int(logFile.Fd()), 2, 0)
	}

	// Move the config so we can inspect it on failure
	shared.FileMove(configPath, shared.LogPath(name, "lxc.conf"))

	return c.Start()
}

func containerLogDelete(d *Daemon, r *http.Request) Response {
	name := mux.Vars(r)["name"]
	file := mux.Vars(r)["file"]

	if err := validContainerName(name); err != nil {
		return BadRequest(err)
	}

	if !validLogFileName(file) {
		return BadRequest(fmt.Errorf("log file name %s not valid", file))
	}

	return SmartError(os.Remove(shared.LogPath(name, file)))
}

func (c *lxdContainer) Start() error {
	f, err := ioutil.TempFile("", "lxd_lxc_startconfig_")
	if err != nil {
		return err
	}
	configPath := f.Name()
	if err = f.Chmod(0600); err != nil {
		f.Close()
		os.Remove(configPath)
		return err
	}
	f.Close()

	err = c.c.SaveConfigFile(configPath)
	if err != nil {
		return err
	}

	err = templateApply(c, "start")
	if err != nil {
		return err
	}

	err = exec.Command(
		os.Args[0],
		"forkstart",
		c.name,
		c.daemon.lxcpath,
		configPath).Run()

	if err != nil {
		err = fmt.Errorf(
			"Error calling 'lxd forkstart %s %s %s': err='%v'",
			c.name,
			c.daemon.lxcpath,
			shared.LogPath(c.name, "lxc.conf"),
			err)
	}

	if err == nil && c.ephemeral == true {
		containerWatchEphemeral(c)
	}

	return err
}

func containerLogGet(d *Daemon, r *http.Request) Response {
	name := mux.Vars(r)["name"]
	file := mux.Vars(r)["file"]

	if err := validContainerName(name); err != nil {
		return BadRequest(err)
	}

	if !validLogFileName(file) {
		return BadRequest(fmt.Errorf("log file name %s not valid", file))
	}

	ent := fileResponseEntry{
		path:     shared.LogPath(name, file),
		filename: file,
	}

	return FileResponse(r, []fileResponseEntry{ent}, nil, false)
}

//.........这里部分代码省略.........
	}

	architecture, err := shared.ArchitectureId(architectureName)
	if err != nil {
		return err
	}
	architectures = append(architectures, architecture)

	personalities, err := shared.ArchitecturePersonalities(architecture)
	if err != nil {
		return err
	}
	for _, personality := range personalities {
		architectures = append(architectures, personality)
	}
	d.architectures = architectures

	/* Set container path */
	d.lxcpath = shared.VarPath("containers")

	/* Make sure all our directories are available */
	if err := os.MkdirAll(shared.VarPath("containers"), 0711); err != nil {
		return err
	}
	if err := os.MkdirAll(shared.VarPath("devices"), 0711); err != nil {
		return err
	}
	if err := os.MkdirAll(shared.VarPath("devlxd"), 0755); err != nil {
		return err
	}
	if err := os.MkdirAll(shared.VarPath("images"), 0700); err != nil {
		return err
	}
	if err := os.MkdirAll(shared.LogPath(), 0700); err != nil {
		return err
	}
	if err := os.MkdirAll(shared.VarPath("security"), 0700); err != nil {
		return err
	}
	if err := os.MkdirAll(shared.VarPath("shmounts"), 0711); err != nil {
		return err
	}
	if err := os.MkdirAll(shared.VarPath("snapshots"), 0700); err != nil {
		return err
	}

	/* Detect the filesystem */
	d.BackingFs, err = filesystemDetect(d.lxcpath)
	if err != nil {
		shared.Log.Error("Error detecting backing fs", log.Ctx{"err": err})
	}

	/* Read the uid/gid allocation */
	d.IdmapSet, err = shared.DefaultIdmapSet()
	if err != nil {
		shared.Log.Warn("Error reading idmap", log.Ctx{"err": err.Error()})
		shared.Log.Warn("Only privileged containers will be able to run")
	} else {
		shared.Log.Info("Default uid/gid map:")
		for _, lxcmap := range d.IdmapSet.ToLxcString() {
			shared.Log.Info(strings.TrimRight(" - "+lxcmap, "\n"))
		}
	}

	/* Initialize the database */
	err = initializeDbObject(d, shared.VarPath("lxd.db"))

/*
 * This is called by lxd when called as "lxd forkexec <container>"
 */
func execContainer(args []string) (int, error) {
	if len(args) < 6 {
		return -1, fmt.Errorf("Bad arguments: %q", args)
	}

	wait := true
	if args[1] == "nowait" {
		wait = false
	}
	name := args[2]
	lxcpath := args[3]
	configPath := args[4]

	c, err := lxc.NewContainer(name, lxcpath)
	if err != nil {
		return -1, fmt.Errorf("Error initializing container for start: %q", err)
	}

	err = c.LoadConfigFile(configPath)
	if err != nil {
		return -1, fmt.Errorf("Error opening startup config file: %q", err)
	}

	syscall.Dup3(int(os.Stdin.Fd()), 200, 0)
	syscall.Dup3(int(os.Stdout.Fd()), 201, 0)
	syscall.Dup3(int(os.Stderr.Fd()), 202, 0)

	syscall.Close(int(os.Stdin.Fd()))
	syscall.Close(int(os.Stdout.Fd()))
	syscall.Close(int(os.Stderr.Fd()))

	opts := lxc.DefaultAttachOptions
	opts.ClearEnv = true
	opts.StdinFd = 200
	opts.StdoutFd = 201
	opts.StderrFd = 202

	logPath := shared.LogPath(name, "forkexec.log")
	if shared.PathExists(logPath) {
		os.Remove(logPath)
	}

	logFile, err := os.OpenFile(logPath, os.O_WRONLY|os.O_CREATE|os.O_SYNC, 0644)
	if err == nil {
		syscall.Dup3(int(logFile.Fd()), 1, 0)
		syscall.Dup3(int(logFile.Fd()), 2, 0)
	}

	env := []string{}
	cmd := []string{}

	section := ""
	for _, arg := range args[5:len(args)] {
		// The "cmd" section must come last as it may contain a --
		if arg == "--" && section != "cmd" {
			section = ""
			continue
		}

		if section == "" {
			section = arg
			continue
		}

		if section == "env" {
			fields := strings.SplitN(arg, "=", 2)
			if len(fields) == 2 && fields[0] == "HOME" {
				opts.Cwd = fields[1]
			}
			env = append(env, arg)
		} else if section == "cmd" {
			cmd = append(cmd, arg)
		} else {
			return -1, fmt.Errorf("Invalid exec section: %s", section)
		}
	}

	opts.Env = env

	var status int
	if wait {
		status, err = c.RunCommandStatus(cmd, opts)
		if err != nil {
			return -1, fmt.Errorf("Failed running command and waiting for it to exit: %q", err)
		}
	} else {
		status, err = c.RunCommandNoWait(cmd, opts)
		if err != nil {
			return -1, fmt.Errorf("Failed running command: %q", err)
		}
		// Send the PID of the executing process.
		w := os.NewFile(uintptr(3), "attachedPid")
		defer w.Close()

		err = json.NewEncoder(w).Encode(status)
		if err != nil {
			return -1, fmt.Errorf("Failed sending PID of executing command: %q", err)
//.........这里部分代码省略.........

func containerCreateInternal(d *Daemon, args containerArgs) (container, error) {
	// Set default values
	if args.Profiles == nil {
		args.Profiles = []string{"default"}
	}

	if args.Config == nil {
		args.Config = map[string]string{}
	}

	if args.BaseImage != "" {
		args.Config["volatile.base_image"] = args.BaseImage
	}

	if args.Devices == nil {
		args.Devices = shared.Devices{}
	}

	if args.Architecture == 0 {
		args.Architecture = d.architectures[0]
	}

	// Validate container name
	if args.Ctype == cTypeRegular {
		err := containerValidName(args.Name)
		if err != nil {
			return nil, err
		}
	}

	// Validate container config
	err := containerValidConfig(d, args.Config, false, false)
	if err != nil {
		return nil, err
	}

	// Validate container devices
	err = containerValidDevices(args.Devices, false, false)
	if err != nil {
		return nil, err
	}

	// Validate architecture
	_, err = shared.ArchitectureName(args.Architecture)
	if err != nil {
		return nil, err
	}

	// Validate profiles
	profiles, err := dbProfiles(d.db)
	if err != nil {
		return nil, err
	}

	for _, profile := range args.Profiles {
		if !shared.StringInSlice(profile, profiles) {
			return nil, fmt.Errorf("Requested profile '%s' doesn't exist", profile)
		}
	}

	path := containerPath(args.Name, args.Ctype == cTypeSnapshot)
	if shared.PathExists(path) {
		if shared.IsSnapshot(args.Name) {
			return nil, fmt.Errorf("Snapshot '%s' already exists", args.Name)
		}
		return nil, fmt.Errorf("The container already exists")
	}

	// Wipe any existing log for this container name
	os.RemoveAll(shared.LogPath(args.Name))

	// Create the container entry
	id, err := dbContainerCreate(d.db, args)
	if err != nil {
		return nil, err
	}
	args.Id = id

	// Read the timestamp from the database
	dbArgs, err := dbContainerGet(d.db, args.Name)
	if err != nil {
		return nil, err
	}
	args.CreationDate = dbArgs.CreationDate
	args.LastUsedDate = dbArgs.LastUsedDate

	return containerLXCCreate(d, args)
}

//.........这里部分代码省略.........
	}

	architecture, err := shared.ArchitectureId(architectureName)
	if err != nil {
		return err
	}
	architectures = append(architectures, architecture)

	personalities, err := shared.ArchitecturePersonalities(architecture)
	if err != nil {
		return err
	}
	for _, personality := range personalities {
		architectures = append(architectures, personality)
	}
	d.architectures = architectures

	/* Set container path */
	d.lxcpath = shared.VarPath("containers")

	/* Make sure all our directories are available */
	if err := os.MkdirAll(shared.VarPath("containers"), 0711); err != nil {
		return err
	}
	if err := os.MkdirAll(shared.VarPath("devices"), 0711); err != nil {
		return err
	}
	if err := os.MkdirAll(shared.VarPath("devlxd"), 0755); err != nil {
		return err
	}
	if err := os.MkdirAll(shared.VarPath("images"), 0700); err != nil {
		return err
	}
	if err := os.MkdirAll(shared.LogPath(), 0700); err != nil {
		return err
	}
	if err := os.MkdirAll(shared.VarPath("security"), 0700); err != nil {
		return err
	}
	if err := os.MkdirAll(shared.VarPath("shmounts"), 0711); err != nil {
		return err
	}
	if err := os.MkdirAll(shared.VarPath("snapshots"), 0700); err != nil {
		return err
	}

	/* Detect the filesystem */
	d.BackingFs, err = filesystemDetect(d.lxcpath)
	if err != nil {
		shared.Log.Error("Error detecting backing fs", log.Ctx{"err": err})
	}

	/* Read the uid/gid allocation */
	d.IdmapSet, err = shared.DefaultIdmapSet()
	if err != nil {
		shared.Log.Warn("Error reading idmap", log.Ctx{"err": err.Error()})
		shared.Log.Warn("Only privileged containers will be able to run")
	} else {
		shared.Log.Info("Default uid/gid map:")
		for _, lxcmap := range d.IdmapSet.ToLxcString() {
			shared.Log.Info(strings.TrimRight(" - "+lxcmap, "\n"))
		}
	}

	/* Initialize the database */
	err = initializeDbObject(d, shared.VarPath("lxd.db"))

func newLxdContainer(name string, daemon *Daemon) (*lxdContainer, error) {
	d := &lxdContainer{
		daemon:       daemon,
		ephemeral:    false,
		architecture: -1,
		cType:        -1,
		id:           -1}

	ephemInt := -1

	templateConfBase := "ubuntu"
	templateConfDir := os.Getenv("LXC_TEMPLATE_CONFIG")
	if templateConfDir == "" {
		templateConfDir = "/usr/share/lxc/config"
	}

	q := "SELECT id, architecture, type, ephemeral FROM containers WHERE name=?"
	arg1 := []interface{}{name}
	arg2 := []interface{}{&d.id, &d.architecture, &d.cType, &ephemInt}
	err := dbQueryRowScan(daemon.db, q, arg1, arg2)
	if err != nil {
		return nil, err
	}
	if d.id == -1 {
		return nil, fmt.Errorf("Unknown container")
	}

	if ephemInt == 1 {
		d.ephemeral = true
	}

	c, err := lxc.NewContainer(name, daemon.lxcpath)
	if err != nil {
		return nil, err
	}
	d.c = c

	dir := shared.LogPath(c.Name())
	err = os.MkdirAll(dir, 0700)
	if err != nil {
		return nil, err
	}

	if err = d.c.SetLogFile(filepath.Join(dir, "lxc.log")); err != nil {
		return nil, err
	}

	personality, err := shared.ArchitecturePersonality(d.architecture)
	if err == nil {
		err = c.SetConfigItem("lxc.arch", personality)
		if err != nil {
			return nil, err
		}
	}

	err = c.SetConfigItem("lxc.include", fmt.Sprintf("%s/%s.common.conf", templateConfDir, templateConfBase))
	if err != nil {
		return nil, err
	}

	if !d.isPrivileged() {
		err = c.SetConfigItem("lxc.include", fmt.Sprintf("%s/%s.userns.conf", templateConfDir, templateConfBase))
		if err != nil {
			return nil, err
		}
	}

	config, err := dbGetConfig(daemon.db, d.id)
	if err != nil {
		return nil, err
	}
	d.config = config

	profiles, err := dbGetProfiles(daemon.db, d.id)
	if err != nil {
		return nil, err
	}
	d.profiles = profiles
	d.devices = shared.Devices{}
	d.name = name

	rootfsPath := shared.VarPath("lxc", name, "rootfs")
	err = c.SetConfigItem("lxc.rootfs", rootfsPath)
	if err != nil {
		return nil, err
	}
	err = c.SetConfigItem("lxc.loglevel", "0")
	if err != nil {
		return nil, err
	}
	err = c.SetConfigItem("lxc.utsname", name)
	if err != nil {
		return nil, err
	}
	err = c.SetConfigItem("lxc.tty", "0")
	if err != nil {
		return nil, err
	}

	if err := setupDevLxdMount(c); err != nil {
//.........这里部分代码省略.........

func (d *Daemon) ExpireLogs() error {
	entries, err := ioutil.ReadDir(shared.LogPath())
	if err != nil {
		return err
	}

	result, err := dbContainersList(d.db, cTypeRegular)
	if err != nil {
		return err
	}

	newestFile := func(path string, dir os.FileInfo) time.Time {
		newest := dir.ModTime()

		entries, err := ioutil.ReadDir(path)
		if err != nil {
			return newest
		}

		for _, entry := range entries {
			if entry.ModTime().After(newest) {
				newest = entry.ModTime()
			}
		}

		return newest
	}

	for _, entry := range entries {
		// Check if the container still exists
		if shared.StringInSlice(entry.Name(), result) {
			// Remove any log file which wasn't modified in the past 48 hours
			logs, err := ioutil.ReadDir(shared.LogPath(entry.Name()))
			if err != nil {
				return err
			}

			for _, logfile := range logs {
				path := shared.LogPath(entry.Name(), logfile.Name())

				// Always keep the LXC config
				if logfile.Name() == "lxc.conf" {
					continue
				}

				// Deal with directories (snapshots)
				if logfile.IsDir() {
					newest := newestFile(path, logfile)
					if time.Since(newest).Hours() >= 48 {
						os.RemoveAll(path)
						if err != nil {
							return err
						}
					}

					continue
				}

				// Individual files
				if time.Since(logfile.ModTime()).Hours() >= 48 {
					err := os.Remove(path)
					if err != nil {
						return err
					}
				}
			}
		} else {
			// Empty directory if unchanged in the past 24 hours
			path := shared.LogPath(entry.Name())
			newest := newestFile(path, entry)
			if time.Since(newest).Hours() >= 24 {
				err := os.RemoveAll(path)
				if err != nil {
					return err
				}
			}
		}
	}

	return nil
}

func (c *containerLXD) LogPathGet() string {
	return shared.LogPath(c.NameGet())
}