fsnotify

README

File system notifications for Go

Go 1.3+ required.

Cross platform: Windows, Linux, BSD and OS X.

Adapter	OS	Status
inotify	Linux, Android*	Supported
kqueue	BSD, OS X, iOS*	Supported
ReadDirectoryChangesW	Windows	Supported
FSEvents	OS X	Planned
FEN	Solaris 11	Planned
fanotify	Linux 2.6.37+
Polling	All	Maybe
	Plan 9

* Android and iOS are untested.

Please see the documentation for usage. Consult the Wiki for the FAQ and further information.

API stability

Two major versions of fsnotify exist.

fsnotify.v0 is API-compatible with howeyc/fsnotify. Bugfixes may be backported, but I recommend upgrading to v1.

import "gopkg.in/fsnotify.v0"

* Refer to the package as fsnotify (without the .v0 suffix).

fsnotify.v1 provides a new API based on this design document. You can import v1 with:

import "gopkg.in/fsnotify.v1"

Further API changes are planned, but a new major revision will be tagged, so you can depend on the v1 API.

master may have untagged changes. Use it to test the very latest code, but don't expect it to remain API-compatible:

import "github.com/go-fsnotify/fsnotify"

Contributing

• Send questions to golang-dev@googlegroups.com.
• Request features and report bugs using the GitHub Issue Tracker. Please indicate the platform you are running on.

fsnotify is derived from code in the golang.org/x/exp package and it may be included in the standard library in the future. Therefore fsnotify carries the same LICENSE as Go. Contributors retain their copyright, so you need to fill out a short form before we can accept your contribution: Google Individual Contributor License Agreement.

Please read CONTRIBUTING before opening a pull request.

Example

See example_test.go.

Documentation

Overview

Package fsnotify provides a platform-independent interface for file system notifications.

Index

• type Event
  • func (e Event) String() string
• type Op
• type Watcher
  • func NewWatcher() (*Watcher, error)
  • func (w *Watcher) Add(name string) error
  • func (w *Watcher) Close() error
  • func (w *Watcher) Remove(name string) error

Examples

• NewWatcher

Types

type Event

type Event struct {
	Name string // Relative path to the file or directory.
	Op   Op     // File operation that triggered the event.
}

Event represents a single file system notification.

func (Event) String

func (e Event) String() string

String returns a string representation of the event in the form "file: REMOVE|WRITE|..."

type Op

type Op uint32

Op describes a set of file operations.

const (
	Create Op = 1 << iota
	Write
	Remove
	Rename
	Chmod
)

These are the generalized file operations that can trigger a notification.

type Watcher

type Watcher struct {
	Events chan Event
	Errors chan error
	// contains filtered or unexported fields
}

Watcher watches a set of files, delivering events to a channel.

func NewWatcher

func NewWatcher() (*Watcher, error)

NewWatcher establishes a new watcher with the underlying OS and begins waiting for events.

Example

watcher, err := fsnotify.NewWatcher()
if err != nil {
	log.Fatal(err)
}
defer watcher.Close()

done := make(chan bool)
go func() {
	for {
		select {
		case event := <-watcher.Events:
			log.Println("event:", event)
			if event.Op&fsnotify.Write == fsnotify.Write {
				log.Println("modified file:", event.Name)
			}
		case err := <-watcher.Errors:
			log.Println("error:", err)
		}
	}
}()

err = watcher.Add("/tmp/foo")
if err != nil {
	log.Fatal(err)
}
<-done

func (*Watcher) Add

func (w *Watcher) Add(name string) error

Add starts watching the named file or directory (non-recursively).

func (*Watcher) Close

func (w *Watcher) Close() error

Close removes all watches and closes the events channel.

func (*Watcher) Remove

func (w *Watcher) Remove(name string) error

Remove stops watching the the named file or directory (non-recursively).