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