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+
USN Journals	Windows	Maybe
Polling	All	Maybe

* 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 unreleased changes. Use it to test the very latest code or when contributing, but don't expect it to remain API-compatible:

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

Contributing

Please refer to CONTRIBUTING before opening an issue or 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

package main

import (
	"log"

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

func main() {
	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 named file or directory (non-recursively).