syncthing/lib/fs/util.go

92 lines
2.0 KiB
Go

// 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/.
package fs
import (
"errors"
"fmt"
"os"
"path/filepath"
"runtime"
"strings"
)
var errNoHome = errors.New("no home directory found - set $HOME (or the platform equivalent)")
func ExpandTilde(path string) (string, error) {
if path == "~" {
return getHomeDir()
}
path = filepath.FromSlash(path)
if !strings.HasPrefix(path, fmt.Sprintf("~%c", PathSeparator)) {
return path, nil
}
home, err := getHomeDir()
if err != nil {
return "", err
}
return filepath.Join(home, path[2:]), nil
}
func getHomeDir() (string, error) {
var home string
switch runtime.GOOS {
case "windows":
home = filepath.Join(os.Getenv("HomeDrive"), os.Getenv("HomePath"))
if home == "" {
home = os.Getenv("UserProfile")
}
default:
home = os.Getenv("HOME")
}
if home == "" {
return "", errNoHome
}
return home, nil
}
var windowsDisallowedCharacters = string([]rune{
'<', '>', ':', '"', '|', '?', '*',
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10,
11, 12, 13, 14, 15, 16, 17, 18, 19, 20,
21, 22, 23, 24, 25, 26, 27, 28, 29, 30,
31,
})
func WindowsInvalidFilename(name string) bool {
// None of the path components should end in space
for _, part := range strings.Split(name, `\`) {
if len(part) == 0 {
continue
}
if part[len(part)-1] == ' ' {
// Names ending in space are not valid.
return true
}
}
// The path must not contain any disallowed characters
return strings.ContainsAny(name, windowsDisallowedCharacters)
}
func IsParent(path, parent string) bool {
if len(parent) == 0 {
// The empty string is the parent of everything except the empty
// string. (Avoids panic in the next step.)
return len(path) > 0
}
if parent[len(parent)-1] != PathSeparator {
parent += string(PathSeparator)
}
return strings.HasPrefix(path, parent)
}