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utils.go
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utils.go
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/*
* Copyright (C) 2016 ~ 2018 Deepin Technology Co., Ltd.
*
* Author: jouyouyun <jouyouwen717@gmail.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package apps
import (
"os"
"os/user"
"path/filepath"
"strconv"
"strings"
"syscall"
)
func intSliceContains(slice []int, a int) bool {
for _, elem := range slice {
if elem == a {
return true
}
}
return false
}
func intSliceRemove(slice []int, a int) (ret []int) {
for _, elem := range slice {
if elem != a {
ret = append(ret, elem)
}
}
return
}
func readDirNames(dirname string) ([]string, error) {
f, err := os.Open(dirname)
if err != nil {
return nil, err
}
defer f.Close()
names, err := f.Readdirnames(-1)
if err != nil {
return nil, err
}
return names, nil
}
func Walk(root string, walkFn WalkFunc) {
info, err := os.Lstat(root)
if err != nil {
return
}
walk(root, ".", info, walkFn)
}
func walk(root, name0 string, info os.FileInfo, walkFn WalkFunc) {
walkFn(name0, info)
if !info.IsDir() {
return
}
path := filepath.Join(root, name0)
names, err := readDirNames(path)
if err != nil {
return
}
for _, name := range names {
filename := filepath.Join(path, name)
fileInfo, err := os.Lstat(filename)
if err != nil {
continue
}
walk(root, filepath.Join(name0, name), fileInfo, walkFn)
}
}
type WalkFunc func(name string, info os.FileInfo)
func getDirsAndApps(root string) (dirs, apps []string) {
Walk(root, func(name string, info os.FileInfo) {
if info.IsDir() {
dirs = append(dirs, name)
} else if filepath.Ext(name) == desktopExt {
apps = append(apps, strings.TrimSuffix(name, desktopExt))
}
})
return
}
const desktopExt = ".desktop"
func isDesktopFile(path string) bool {
return filepath.Ext(path) == desktopExt
}
func removeDesktopExt(name string) string {
return strings.TrimSuffix(name, desktopExt)
}
func getSystemDataDirs() []string {
return []string{"/usr/share", "/usr/local/share"}
}
// get user home
func getHomeByUid(uid int) (string, error) {
user, err := user.LookupId(strconv.Itoa(uid))
if err != nil {
return "", err
}
return user.HomeDir, nil
}
// copy from go source src/os/path.go
func MkdirAll(path string, uid int, perm os.FileMode) error {
logger.Debug("MkdirAll", path, uid, perm)
// Fast path: if we can tell whether path is a directory or file, stop with success or error.
dir, err := os.Stat(path)
if err == nil {
if dir.IsDir() {
return nil
}
return &os.PathError{Op: "mkdir", Path: path, Err: syscall.ENOTDIR}
}
// Slow path: make sure parent exists and then call Mkdir for path.
i := len(path)
for i > 0 && os.IsPathSeparator(path[i-1]) { // Skip trailing path separator.
i--
}
j := i
for j > 0 && !os.IsPathSeparator(path[j-1]) { // Scan backward over element.
j--
}
if j > 1 {
// Create parent
err = MkdirAll(path[0:j-1], uid, perm)
if err != nil {
return err
}
}
// Parent now exists; invoke Mkdir and use its result.
err = os.Mkdir(path, perm)
if err != nil {
// Handle arguments like "foo/." by
// double-checking that directory doesn't exist.
dir, err1 := os.Lstat(path)
if err1 == nil && dir.IsDir() {
return nil
}
return err
}
err = os.Chown(path, uid, uid)
return err
}