101 lines
2.7 KiB
Go
101 lines
2.7 KiB
Go
// Copyright (C) 2016 The Syncthing Authors.
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//
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// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this file,
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// You can obtain one at https://mozilla.org/MPL/2.0/.
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//go:build !windows
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// +build !windows
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package fs
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import (
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"os"
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"path/filepath"
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"strings"
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)
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func (BasicFilesystem) SymlinksSupported() bool {
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return true
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}
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func (f *BasicFilesystem) CreateSymlink(target, name string) error {
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name, err := f.rooted(name)
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if err != nil {
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return err
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}
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return os.Symlink(target, name)
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}
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func (f *BasicFilesystem) ReadSymlink(name string) (string, error) {
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name, err := f.rooted(name)
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if err != nil {
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return "", err
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}
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return os.Readlink(name)
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}
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func (f *BasicFilesystem) mkdirAll(path string, perm os.FileMode) error {
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return os.MkdirAll(path, perm)
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}
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// Unhide is a noop on unix, as unhiding files requires renaming them.
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// We still check that the relative path does not try to escape the root
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func (f *BasicFilesystem) Unhide(name string) error {
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_, err := f.rooted(name)
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return err
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}
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// Hide is a noop on unix, as hiding files requires renaming them.
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// We still check that the relative path does not try to escape the root
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func (f *BasicFilesystem) Hide(name string) error {
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_, err := f.rooted(name)
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return err
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}
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func (f *BasicFilesystem) Roots() ([]string, error) {
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return []string{"/"}, nil
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}
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// unrootedChecked returns the path relative to the folder root (same as
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// unrooted) or an error if the given path is not a subpath and handles the
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// special case when the given path is the folder root without a trailing
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// pathseparator.
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func (f *BasicFilesystem) unrootedChecked(absPath string, roots []string) (string, *ErrWatchEventOutsideRoot) {
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for _, root := range roots {
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// Make sure the root ends with precisely one path separator, to
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// ease prefix comparisons.
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root := strings.TrimRight(root, string(PathSeparator)) + string(PathSeparator)
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if absPath+string(PathSeparator) == root {
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return ".", nil
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}
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if strings.HasPrefix(absPath, root) {
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return rel(absPath, root), nil
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}
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}
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return "", f.newErrWatchEventOutsideRoot(absPath, roots)
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}
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func rel(path, prefix string) string {
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return strings.TrimPrefix(strings.TrimPrefix(path, prefix), string(PathSeparator))
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}
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var evalSymlinks = filepath.EvalSymlinks
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// watchPaths adjust the folder root for use with the notify backend and the
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// corresponding absolute path to be passed to notify to watch name.
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func (f *BasicFilesystem) watchPaths(name string) (string, []string, error) {
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root, err := evalSymlinks(f.root)
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if err != nil {
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return "", nil, err
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}
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absName, err := rooted(name, root)
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if err != nil {
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return "", nil, err
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}
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return filepath.Join(absName, "..."), []string{root}, nil
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}
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