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// Copyright 2018 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build darwin || freebsd || linux || netbsd
package unix_test
import (
"os"
"path/filepath"
"runtime"
"strings"
"testing"
"golang.org/x/sys/unix"
)
func TestXattr(t *testing.T) {
chtmpdir(t)
f := "xattr1"
touch(t, f)
xattrName := "user.test"
xattrDataSet := "gopher"
err := unix.Setxattr(f, xattrName, []byte{}, 0)
if err == unix.ENOTSUP || err == unix.EOPNOTSUPP {
t.Skip("filesystem does not support extended attributes, skipping test")
} else if err != nil {
t.Fatalf("Setxattr: %v", err)
}
err = unix.Setxattr(f, xattrName, []byte(xattrDataSet), 0)
if err != nil {
t.Fatalf("Setxattr: %v", err)
}
// find size
size, err := unix.Listxattr(f, nil)
if err != nil {
t.Fatalf("Listxattr: %v", err)
}
if size <= 0 {
t.Fatalf("Listxattr returned an empty list of attributes")
}
buf := make([]byte, size)
read, err := unix.Listxattr(f, buf)
if err != nil {
t.Fatalf("Listxattr: %v", err)
}
xattrs := stringsFromByteSlice(buf[:read])
xattrWant := xattrName
switch runtime.GOOS {
case "freebsd", "netbsd":
// On FreeBSD and NetBSD, the namespace is stored separately from the xattr
// name and Listxattr doesn't return the namespace prefix.
xattrWant = strings.TrimPrefix(xattrWant, "user.")
}
found := false
for _, name := range xattrs {
if name == xattrWant {
found = true
break
}
}
if !found {
t.Errorf("Listxattr did not return previously set attribute %q in attributes %v", xattrName, xattrs)
}
// find size
size, err = unix.Getxattr(f, xattrName, nil)
if err != nil {
t.Fatalf("Getxattr: %v", err)
}
if size <= 0 {
t.Fatalf("Getxattr returned an empty attribute")
}
xattrDataGet := make([]byte, size)
_, err = unix.Getxattr(f, xattrName, xattrDataGet)
if err != nil {
t.Fatalf("Getxattr: %v", err)
}
got := string(xattrDataGet)
if got != xattrDataSet {
t.Errorf("Getxattr: expected attribute value %s, got %s", xattrDataSet, got)
}
err = unix.Removexattr(f, xattrName)
if err != nil {
t.Fatalf("Removexattr: %v", err)
}
n := "nonexistent"
err = unix.Lsetxattr(n, xattrName, []byte(xattrDataSet), 0)
if err != unix.ENOENT {
t.Errorf("Lsetxattr: expected %v on non-existent file, got %v", unix.ENOENT, err)
}
_, err = unix.Lgetxattr(n, xattrName, nil)
if err != unix.ENOENT {
t.Errorf("Lgetxattr: %v", err)
}
s := "symlink1"
err = os.Symlink(n, s)
if err != nil {
t.Fatal(err)
}
err = unix.Lsetxattr(s, xattrName, []byte(xattrDataSet), 0)
if err != nil {
// Linux and Android doesn't support xattrs on symlinks according
// to xattr(7), so just test that we get the proper error.
if (runtime.GOOS != "linux" && runtime.GOOS != "android") || err != unix.EPERM {
t.Fatalf("Lsetxattr: %v", err)
}
}
}
func TestFdXattr(t *testing.T) {
file, err := os.Create(filepath.Join(t.TempDir(), "TestFdXattr"))
if err != nil {
t.Fatal(err)
}
defer file.Close()
fd := int(file.Fd())
xattrName := "user.test"
xattrDataSet := "gopher"
err = unix.Fsetxattr(fd, xattrName, []byte(xattrDataSet), 0)
if err == unix.ENOTSUP || err == unix.EOPNOTSUPP {
t.Skip("filesystem does not support extended attributes, skipping test")
} else if err != nil {
t.Fatalf("Fsetxattr: %v", err)
}
// find size
size, err := unix.Flistxattr(fd, nil)
if err != nil {
t.Fatalf("Flistxattr: %v", err)
}
if size <= 0 {
t.Fatalf("Flistxattr returned an empty list of attributes")
}
buf := make([]byte, size)
read, err := unix.Flistxattr(fd, buf)
if err != nil {
t.Fatalf("Flistxattr: %v", err)
}
xattrs := stringsFromByteSlice(buf[:read])
xattrWant := xattrName
switch runtime.GOOS {
case "freebsd", "netbsd":
// On FreeBSD and NetBSD, the namespace is stored separately from the xattr
// name and Listxattr doesn't return the namespace prefix.
xattrWant = strings.TrimPrefix(xattrWant, "user.")
}
found := false
for _, name := range xattrs {
if name == xattrWant {
found = true
break
}
}
if !found {
t.Errorf("Flistxattr did not return previously set attribute %q in attributes %v", xattrName, xattrs)
}
// find size
size, err = unix.Fgetxattr(fd, xattrName, nil)
if err != nil {
t.Fatalf("Fgetxattr: %v", err)
}
if size <= 0 {
t.Fatalf("Fgetxattr returned an empty attribute")
}
xattrDataGet := make([]byte, size)
_, err = unix.Fgetxattr(fd, xattrName, xattrDataGet)
if err != nil {
t.Fatalf("Fgetxattr: %v", err)
}
got := string(xattrDataGet)
if got != xattrDataSet {
t.Errorf("Fgetxattr: expected attribute value %s, got %s", xattrDataSet, got)
}
err = unix.Fremovexattr(fd, xattrName)
if err != nil {
t.Fatalf("Fremovexattr: %v", err)
}
}