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fsnotify.go
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fsnotify.go
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// Copyright 2012 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build !plan9
// +build !plan9
// Package fsnotify provides a cross-platform interface for file system
// notifications.
package fsnotify
import (
"errors"
"fmt"
"io/fs"
"path/filepath"
"strings"
)
// Event represents a single file system notification.
type Event struct {
// Path to the file or directory.
//
// Paths are relative to the input; for example with Add("dir") the Name
// will be set to "dir/file" if you create that file, but if you use
// Add("/path/to/dir") it will be "/path/to/dir/file".
Name string
// File operation that triggered the event.
//
// This is a bitmask as some systems may send multiple operations at once.
// Use the Op.Has() or Event.Has() method instead of comparing with ==.
Op Op
}
// Op describes a set of file operations.
type Op uint32
// These are the generalized file operations that can trigger a notification.
const (
Create Op = 1 << iota
Write
Remove
Rename
Chmod
)
// Common errors that can be reported by a watcher
var (
ErrNonExistentWatch = errors.New("can't remove non-existent watcher")
ErrEventOverflow = errors.New("fsnotify queue overflow")
ErrNotDirectory = errors.New("not a directory")
ErrRecursionUnsupported = errors.New("recursion not supported")
)
func (op Op) String() string {
var b strings.Builder
if op.Has(Create) {
b.WriteString("|CREATE")
}
if op.Has(Remove) {
b.WriteString("|REMOVE")
}
if op.Has(Write) {
b.WriteString("|WRITE")
}
if op.Has(Rename) {
b.WriteString("|RENAME")
}
if op.Has(Chmod) {
b.WriteString("|CHMOD")
}
if b.Len() == 0 {
return ""
}
return b.String()[1:]
}
// Has reports if this operation has the given operation.
func (o Op) Has(h Op) bool { return o&h == h }
// Has reports if this event has the given operation.
func (e Event) Has(op Op) bool { return e.Op.Has(op) }
// String returns a string representation of the event in the form
// "file: REMOVE|WRITE|..."
func (e Event) String() string {
return fmt.Sprintf("%q: %s", e.Name, e.Op.String())
}
// findDirs finds all directories under path (return value *includes* path as
// the first entry).
//
// A symlink for a directory is not considered a directory.
func findDirs(path string) ([]string, error) {
dirs := make([]string, 0, 8)
err := filepath.WalkDir(path, func(root string, d fs.DirEntry, err error) error {
if err != nil {
return err
}
if root == path && !d.IsDir() {
return fmt.Errorf("%q: %w", path, ErrNotDirectory)
}
if d.IsDir() {
dirs = append(dirs, root)
}
return nil
})
if err != nil {
return nil, err
}
return dirs, nil
}
// Check if this path is recursive (ends with "/..."), and return the path with
// the /... stripped.
func recursivePath(path string) (string, bool) {
if filepath.Base(path) == "..." {
return filepath.Dir(path), true
}
return path, false
}