mirror of
https://gitea.com/Lydanne/buildx.git
synced 2025-11-04 10:03:42 +08:00
119 lines
3.1 KiB
Go
119 lines
3.1 KiB
Go
//go:build linux || darwin
|
|
// +build linux darwin
|
|
|
|
/*
|
|
Copyright The containerd Authors.
|
|
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
|
you may not use this file except in compliance with the License.
|
|
You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License.
|
|
*/
|
|
|
|
package sysx
|
|
|
|
import (
|
|
"bytes"
|
|
|
|
"golang.org/x/sys/unix"
|
|
)
|
|
|
|
// Listxattr calls syscall listxattr and reads all content
|
|
// and returns a string array
|
|
func Listxattr(path string) ([]string, error) {
|
|
return listxattrAll(path, unix.Listxattr)
|
|
}
|
|
|
|
// Removexattr calls syscall removexattr
|
|
func Removexattr(path string, attr string) (err error) {
|
|
return unix.Removexattr(path, attr)
|
|
}
|
|
|
|
// Setxattr calls syscall setxattr
|
|
func Setxattr(path string, attr string, data []byte, flags int) (err error) {
|
|
return unix.Setxattr(path, attr, data, flags)
|
|
}
|
|
|
|
// Getxattr calls syscall getxattr
|
|
func Getxattr(path, attr string) ([]byte, error) {
|
|
return getxattrAll(path, attr, unix.Getxattr)
|
|
}
|
|
|
|
// LListxattr lists xattrs, not following symlinks
|
|
func LListxattr(path string) ([]string, error) {
|
|
return listxattrAll(path, unix.Llistxattr)
|
|
}
|
|
|
|
// LRemovexattr removes an xattr, not following symlinks
|
|
func LRemovexattr(path string, attr string) (err error) {
|
|
return unix.Lremovexattr(path, attr)
|
|
}
|
|
|
|
// LSetxattr sets an xattr, not following symlinks
|
|
func LSetxattr(path string, attr string, data []byte, flags int) (err error) {
|
|
return unix.Lsetxattr(path, attr, data, flags)
|
|
}
|
|
|
|
// LGetxattr gets an xattr, not following symlinks
|
|
func LGetxattr(path, attr string) ([]byte, error) {
|
|
return getxattrAll(path, attr, unix.Lgetxattr)
|
|
}
|
|
|
|
const defaultXattrBufferSize = 128
|
|
|
|
type listxattrFunc func(path string, dest []byte) (int, error)
|
|
|
|
func listxattrAll(path string, listFunc listxattrFunc) ([]string, error) {
|
|
buf := make([]byte, defaultXattrBufferSize)
|
|
n, err := listFunc(path, buf)
|
|
for err == unix.ERANGE {
|
|
// Buffer too small, use zero-sized buffer to get the actual size
|
|
n, err = listFunc(path, []byte{})
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
buf = make([]byte, n)
|
|
n, err = listFunc(path, buf)
|
|
}
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
ps := bytes.Split(bytes.TrimSuffix(buf[:n], []byte{0}), []byte{0})
|
|
var entries []string
|
|
for _, p := range ps {
|
|
if len(p) > 0 {
|
|
entries = append(entries, string(p))
|
|
}
|
|
}
|
|
|
|
return entries, nil
|
|
}
|
|
|
|
type getxattrFunc func(string, string, []byte) (int, error)
|
|
|
|
func getxattrAll(path, attr string, getFunc getxattrFunc) ([]byte, error) {
|
|
buf := make([]byte, defaultXattrBufferSize)
|
|
n, err := getFunc(path, attr, buf)
|
|
for err == unix.ERANGE {
|
|
// Buffer too small, use zero-sized buffer to get the actual size
|
|
n, err = getFunc(path, attr, []byte{})
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
buf = make([]byte, n)
|
|
n, err = getFunc(path, attr, buf)
|
|
}
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return buf[:n], nil
|
|
}
|