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// Copyright 2009 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.
package os_test
import (
"bytes"
"errors"
"flag"
"fmt"
"internal/testenv"
"io"
"io/fs"
"os"
. "os"
osexec "os/exec"
"path/filepath"
"reflect"
"runtime"
"runtime/debug"
"sort"
"strings"
"sync"
"syscall"
"testing"
"testing/fstest"
"time"
)
func TestMain(m *testing.M) {
if Getenv("GO_OS_TEST_DRAIN_STDIN") == "1" {
os.Stdout.Close()
io.Copy(io.Discard, os.Stdin)
Exit(0)
}
Exit(m.Run())
}
var dot = []string{
"dir_unix.go",
"env.go",
"error.go",
"file.go",
"os_test.go",
"types.go",
"stat_darwin.go",
"stat_linux.go",
}
type sysDir struct {
name string
files []string
}
var sysdir = func() *sysDir {
switch runtime.GOOS {
case "android":
return &sysDir{
"/system/lib",
[]string{
"libmedia.so",
"libpowermanager.so",
},
}
case "ios":
wd, err := syscall.Getwd()
if err != nil {
wd = err.Error()
}
sd := &sysDir{
filepath.Join(wd, "..", ".."),
[]string{
"ResourceRules.plist",
"Info.plist",
},
}
found := true
for _, f := range sd.files {
path := filepath.Join(sd.name, f)
if _, err := Stat(path); err != nil {
found = false
break
}
}
if found {
return sd
}
// In a self-hosted iOS build the above files might
// not exist. Look for system files instead below.
case "windows":
return &sysDir{
Getenv("SystemRoot") + "\\system32\\drivers\\etc",
[]string{
"networks",
"protocol",
"services",
},
}
case "plan9":
return &sysDir{
"/lib/ndb",
[]string{
"common",
"local",
},
}
}
return &sysDir{
"/etc",
[]string{
"group",
"hosts",
"passwd",
},
}
}()
func size(name string, t *testing.T) int64 {
file, err := Open(name)
if err != nil {
t.Fatal("open failed:", err)
}
defer func() {
if err := file.Close(); err != nil {
t.Error(err)
}
}()
n, err := io.Copy(io.Discard, file)
if err != nil {
t.Fatal(err)
}
return n
}
func equal(name1, name2 string) (r bool) {
switch runtime.GOOS {
case "windows":
r = strings.ToLower(name1) == strings.ToLower(name2)
default:
r = name1 == name2
}
return
}
// localTmp returns a local temporary directory not on NFS.
func localTmp() string {
switch runtime.GOOS {
case "android", "ios", "windows":
return TempDir()
}
return "/tmp"
}
func newFile(testName string, t *testing.T) (f *File) {
f, err := os.CreateTemp(localTmp(), "_Go_"+testName)
if err != nil {
t.Fatalf("TempFile %s: %s", testName, err)
}
return
}
func newDir(testName string, t *testing.T) (name string) {
name, err := os.MkdirTemp(localTmp(), "_Go_"+testName)
if err != nil {
t.Fatalf("TempDir %s: %s", testName, err)
}
return
}
var sfdir = sysdir.name
var sfname = sysdir.files[0]
func TestStat(t *testing.T) {
path := sfdir + "/" + sfname
dir, err := Stat(path)
if err != nil {
t.Fatal("stat failed:", err)
}
if !equal(sfname, dir.Name()) {
t.Error("name should be ", sfname, "; is", dir.Name())
}
filesize := size(path, t)
if dir.Size() != filesize {
t.Error("size should be", filesize, "; is", dir.Size())
}
}
func TestStatError(t *testing.T) {
defer chtmpdir(t)()
path := "no-such-file"
fi, err := Stat(path)
if err == nil {
t.Fatal("got nil, want error")
}
if fi != nil {
t.Errorf("got %v, want nil", fi)
}
if perr, ok := err.(*PathError); !ok {
t.Errorf("got %T, want %T", err, perr)
}
testenv.MustHaveSymlink(t)
link := "symlink"
err = Symlink(path, link)
if err != nil {
t.Fatal(err)
}
fi, err = Stat(link)
if err == nil {
t.Fatal("got nil, want error")
}
if fi != nil {
t.Errorf("got %v, want nil", fi)
}
if perr, ok := err.(*PathError); !ok {
t.Errorf("got %T, want %T", err, perr)
}
}
func TestStatSymlinkLoop(t *testing.T) {
testenv.MustHaveSymlink(t)
defer chtmpdir(t)()
err := os.Symlink("x", "y")
if err != nil {
t.Fatal(err)
}
defer os.Remove("y")
err = os.Symlink("y", "x")
if err != nil {
t.Fatal(err)
}
defer os.Remove("x")
_, err = os.Stat("x")
if _, ok := err.(*fs.PathError); !ok {
t.Errorf("expected *PathError, got %T: %v\n", err, err)
}
}
func TestFstat(t *testing.T) {
path := sfdir + "/" + sfname
file, err1 := Open(path)
if err1 != nil {
t.Fatal("open failed:", err1)
}
defer file.Close()
dir, err2 := file.Stat()
if err2 != nil {
t.Fatal("fstat failed:", err2)
}
if !equal(sfname, dir.Name()) {
t.Error("name should be ", sfname, "; is", dir.Name())
}
filesize := size(path, t)
if dir.Size() != filesize {
t.Error("size should be", filesize, "; is", dir.Size())
}
}
func TestLstat(t *testing.T) {
path := sfdir + "/" + sfname
dir, err := Lstat(path)
if err != nil {
t.Fatal("lstat failed:", err)
}
if !equal(sfname, dir.Name()) {
t.Error("name should be ", sfname, "; is", dir.Name())
}
filesize := size(path, t)
if dir.Size() != filesize {
t.Error("size should be", filesize, "; is", dir.Size())
}
}
// Read with length 0 should not return EOF.
func TestRead0(t *testing.T) {
path := sfdir + "/" + sfname
f, err := Open(path)
if err != nil {
t.Fatal("open failed:", err)
}
defer f.Close()
b := make([]byte, 0)
n, err := f.Read(b)
if n != 0 || err != nil {
t.Errorf("Read(0) = %d, %v, want 0, nil", n, err)
}
b = make([]byte, 100)
n, err = f.Read(b)
if n <= 0 || err != nil {
t.Errorf("Read(100) = %d, %v, want >0, nil", n, err)
}
}
// Reading a closed file should return ErrClosed error
func TestReadClosed(t *testing.T) {
path := sfdir + "/" + sfname
file, err := Open(path)
if err != nil {
t.Fatal("open failed:", err)
}
file.Close() // close immediately
b := make([]byte, 100)
_, err = file.Read(b)
e, ok := err.(*PathError)
if !ok {
t.Fatalf("Read: %T(%v), want PathError", e, e)
}
if e.Err != ErrClosed {
t.Errorf("Read: %v, want PathError(ErrClosed)", e)
}
}
func testReaddirnames(dir string, contents []string, t *testing.T) {
file, err := Open(dir)
if err != nil {
t.Fatalf("open %q failed: %v", dir, err)
}
defer file.Close()
s, err2 := file.Readdirnames(-1)
if err2 != nil {
t.Fatalf("Readdirnames %q failed: %v", dir, err2)
}
for _, m := range contents {
found := false
for _, n := range s {
if n == "." || n == ".." {
t.Errorf("got %q in directory", n)
}
if !equal(m, n) {
continue
}
if found {
t.Error("present twice:", m)
}
found = true
}
if !found {
t.Error("could not find", m)
}
}
if s == nil {
t.Error("Readdirnames returned nil instead of empty slice")
}
}
func testReaddir(dir string, contents []string, t *testing.T) {
file, err := Open(dir)
if err != nil {
t.Fatalf("open %q failed: %v", dir, err)
}
defer file.Close()
s, err2 := file.Readdir(-1)
if err2 != nil {
t.Fatalf("Readdir %q failed: %v", dir, err2)
}
for _, m := range contents {
found := false
for _, n := range s {
if n.Name() == "." || n.Name() == ".." {
t.Errorf("got %q in directory", n.Name())
}
if !equal(m, n.Name()) {
continue
}
if found {
t.Error("present twice:", m)
}
found = true
}
if !found {
t.Error("could not find", m)
}
}
if s == nil {
t.Error("Readdir returned nil instead of empty slice")
}
}
func testReadDir(dir string, contents []string, t *testing.T) {
file, err := Open(dir)
if err != nil {
t.Fatalf("open %q failed: %v", dir, err)
}
defer file.Close()
s, err2 := file.ReadDir(-1)
if err2 != nil {
t.Fatalf("ReadDir %q failed: %v", dir, err2)
}
for _, m := range contents {
found := false
for _, n := range s {
if n.Name() == "." || n.Name() == ".." {
t.Errorf("got %q in directory", n)
}
if !equal(m, n.Name()) {
continue
}
if found {
t.Error("present twice:", m)
}
found = true
lstat, err := Lstat(dir + "/" + m)
if err != nil {
t.Fatal(err)
}
if n.IsDir() != lstat.IsDir() {
t.Errorf("%s: IsDir=%v, want %v", m, n.IsDir(), lstat.IsDir())
}
if n.Type() != lstat.Mode().Type() {
t.Errorf("%s: IsDir=%v, want %v", m, n.Type(), lstat.Mode().Type())
}
info, err := n.Info()
if err != nil {
t.Errorf("%s: Info: %v", m, err)
continue
}
if !SameFile(info, lstat) {
t.Errorf("%s: Info: SameFile(info, lstat) = false", m)
}
}
if !found {
t.Error("could not find", m)
}
}
if s == nil {
t.Error("ReadDir returned nil instead of empty slice")
}
}
func TestFileReaddirnames(t *testing.T) {
testReaddirnames(".", dot, t)
testReaddirnames(sysdir.name, sysdir.files, t)
testReaddirnames(t.TempDir(), nil, t)
}
func TestFileReaddir(t *testing.T) {
testReaddir(".", dot, t)
testReaddir(sysdir.name, sysdir.files, t)
testReaddir(t.TempDir(), nil, t)
}
func TestFileReadDir(t *testing.T) {
testReadDir(".", dot, t)
testReadDir(sysdir.name, sysdir.files, t)
testReadDir(t.TempDir(), nil, t)
}
func benchmarkReaddirname(path string, b *testing.B) {
var nentries int
for i := 0; i < b.N; i++ {
f, err := Open(path)
if err != nil {
b.Fatalf("open %q failed: %v", path, err)
}
ns, err := f.Readdirnames(-1)
f.Close()
if err != nil {
b.Fatalf("readdirnames %q failed: %v", path, err)
}
nentries = len(ns)
}
b.Logf("benchmarkReaddirname %q: %d entries", path, nentries)
}
func benchmarkReaddir(path string, b *testing.B) {
var nentries int
for i := 0; i < b.N; i++ {
f, err := Open(path)
if err != nil {
b.Fatalf("open %q failed: %v", path, err)
}
fs, err := f.Readdir(-1)
f.Close()
if err != nil {
b.Fatalf("readdir %q failed: %v", path, err)
}
nentries = len(fs)
}
b.Logf("benchmarkReaddir %q: %d entries", path, nentries)
}
func benchmarkReadDir(path string, b *testing.B) {
var nentries int
for i := 0; i < b.N; i++ {
f, err := Open(path)
if err != nil {
b.Fatalf("open %q failed: %v", path, err)
}
fs, err := f.ReadDir(-1)
f.Close()
if err != nil {
b.Fatalf("readdir %q failed: %v", path, err)
}
nentries = len(fs)
}
b.Logf("benchmarkReadDir %q: %d entries", path, nentries)
}
func BenchmarkReaddirname(b *testing.B) {
benchmarkReaddirname(".", b)
}
func BenchmarkReaddir(b *testing.B) {
benchmarkReaddir(".", b)
}
func BenchmarkReadDir(b *testing.B) {
benchmarkReadDir(".", b)
}
func benchmarkStat(b *testing.B, path string) {
b.ResetTimer()
for i := 0; i < b.N; i++ {
_, err := Stat(path)
if err != nil {
b.Fatalf("Stat(%q) failed: %v", path, err)
}
}
}
func benchmarkLstat(b *testing.B, path string) {
b.ResetTimer()
for i := 0; i < b.N; i++ {
_, err := Lstat(path)
if err != nil {
b.Fatalf("Lstat(%q) failed: %v", path, err)
}
}
}
func BenchmarkStatDot(b *testing.B) {
benchmarkStat(b, ".")
}
func BenchmarkStatFile(b *testing.B) {
benchmarkStat(b, filepath.Join(runtime.GOROOT(), "src/os/os_test.go"))
}
func BenchmarkStatDir(b *testing.B) {
benchmarkStat(b, filepath.Join(runtime.GOROOT(), "src/os"))
}
func BenchmarkLstatDot(b *testing.B) {
benchmarkLstat(b, ".")
}
func BenchmarkLstatFile(b *testing.B) {
benchmarkLstat(b, filepath.Join(runtime.GOROOT(), "src/os/os_test.go"))
}
func BenchmarkLstatDir(b *testing.B) {
benchmarkLstat(b, filepath.Join(runtime.GOROOT(), "src/os"))
}
// Read the directory one entry at a time.
func smallReaddirnames(file *File, length int, t *testing.T) []string {
names := make([]string, length)
count := 0
for {
d, err := file.Readdirnames(1)
if err == io.EOF {
break
}
if err != nil {
t.Fatalf("readdirnames %q failed: %v", file.Name(), err)
}
if len(d) == 0 {
t.Fatalf("readdirnames %q returned empty slice and no error", file.Name())
}
names[count] = d[0]
count++
}
return names[0:count]
}
// Check that reading a directory one entry at a time gives the same result
// as reading it all at once.
func TestReaddirnamesOneAtATime(t *testing.T) {
// big directory that doesn't change often.
dir := "/usr/bin"
switch runtime.GOOS {
case "android":
dir = "/system/bin"
case "ios":
wd, err := Getwd()
if err != nil {
t.Fatal(err)
}
dir = wd
case "plan9":
dir = "/bin"
case "windows":
dir = Getenv("SystemRoot") + "\\system32"
}
file, err := Open(dir)
if err != nil {
t.Fatalf("open %q failed: %v", dir, err)
}
defer file.Close()
all, err1 := file.Readdirnames(-1)
if err1 != nil {
t.Fatalf("readdirnames %q failed: %v", dir, err1)
}
file1, err2 := Open(dir)
if err2 != nil {
t.Fatalf("open %q failed: %v", dir, err2)
}
defer file1.Close()
small := smallReaddirnames(file1, len(all)+100, t) // +100 in case we screw up
if len(small) < len(all) {
t.Fatalf("len(small) is %d, less than %d", len(small), len(all))
}
for i, n := range all {
if small[i] != n {
t.Errorf("small read %q mismatch: %v", small[i], n)
}
}
}
func TestReaddirNValues(t *testing.T) {
if testing.Short() {
t.Skip("test.short; skipping")
}
dir := t.TempDir()
for i := 1; i <= 105; i++ {
f, err := Create(filepath.Join(dir, fmt.Sprintf("%d", i)))
if err != nil {
t.Fatalf("Create: %v", err)
}
f.Write([]byte(strings.Repeat("X", i)))
f.Close()
}
var d *File
openDir := func() {
var err error
d, err = Open(dir)
if err != nil {
t.Fatalf("Open directory: %v", err)
}
}
readdirExpect := func(n, want int, wantErr error) {
t.Helper()
fi, err := d.Readdir(n)
if err != wantErr {
t.Fatalf("Readdir of %d got error %v, want %v", n, err, wantErr)
}
if g, e := len(fi), want; g != e {
t.Errorf("Readdir of %d got %d files, want %d", n, g, e)
}
}
readDirExpect := func(n, want int, wantErr error) {
t.Helper()
de, err := d.ReadDir(n)
if err != wantErr {
t.Fatalf("ReadDir of %d got error %v, want %v", n, err, wantErr)
}
if g, e := len(de), want; g != e {
t.Errorf("ReadDir of %d got %d files, want %d", n, g, e)
}
}
readdirnamesExpect := func(n, want int, wantErr error) {
t.Helper()
fi, err := d.Readdirnames(n)
if err != wantErr {
t.Fatalf("Readdirnames of %d got error %v, want %v", n, err, wantErr)
}
if g, e := len(fi), want; g != e {
t.Errorf("Readdirnames of %d got %d files, want %d", n, g, e)
}
}
for _, fn := range []func(int, int, error){readdirExpect, readdirnamesExpect, readDirExpect} {
// Test the slurp case
openDir()
fn(0, 105, nil)
fn(0, 0, nil)
d.Close()
// Slurp with -1 instead
openDir()
fn(-1, 105, nil)
fn(-2, 0, nil)
fn(0, 0, nil)
d.Close()
// Test the bounded case
openDir()
fn(1, 1, nil)
fn(2, 2, nil)
fn(105, 102, nil) // and tests buffer >100 case
fn(3, 0, io.EOF)
d.Close()
}
}
func touch(t *testing.T, name string) {
f, err := Create(name)
if err != nil {
t.Fatal(err)
}
if err := f.Close(); err != nil {
t.Fatal(err)
}
}
func TestReaddirStatFailures(t *testing.T) {
switch runtime.GOOS {
case "windows", "plan9":
// Windows and Plan 9 already do this correctly,
// but are structured with different syscalls such
// that they don't use Lstat, so the hook below for
// testing it wouldn't work.
t.Skipf("skipping test on %v", runtime.GOOS)
}
dir := t.TempDir()
touch(t, filepath.Join(dir, "good1"))
touch(t, filepath.Join(dir, "x")) // will disappear or have an error
touch(t, filepath.Join(dir, "good2"))
defer func() {
*LstatP = Lstat
}()
var xerr error // error to return for x
*LstatP = func(path string) (FileInfo, error) {
if xerr != nil && strings.HasSuffix(path, "x") {
return nil, xerr
}
return Lstat(path)
}
readDir := func() ([]FileInfo, error) {
d, err := Open(dir)
if err != nil {
t.Fatal(err)
}
defer d.Close()
return d.Readdir(-1)
}
mustReadDir := func(testName string) []FileInfo {
fis, err := readDir()
if err != nil {
t.Fatalf("%s: Readdir: %v", testName, err)
}
return fis
}
names := func(fis []FileInfo) []string {
s := make([]string, len(fis))
for i, fi := range fis {
s[i] = fi.Name()
}
sort.Strings(s)
return s
}
if got, want := names(mustReadDir("initial readdir")),
[]string{"good1", "good2", "x"}; !reflect.DeepEqual(got, want) {
t.Errorf("initial readdir got %q; want %q", got, want)
}
xerr = ErrNotExist
if got, want := names(mustReadDir("with x disappearing")),
[]string{"good1", "good2"}; !reflect.DeepEqual(got, want) {
t.Errorf("with x disappearing, got %q; want %q", got, want)
}
xerr = errors.New("some real error")
if _, err := readDir(); err != xerr {
t.Errorf("with a non-ErrNotExist error, got error %v; want %v", err, xerr)
}
}
// Readdir on a regular file should fail.
func TestReaddirOfFile(t *testing.T) {
f, err := os.CreateTemp("", "_Go_ReaddirOfFile")
if err != nil {
t.Fatal(err)
}
defer Remove(f.Name())
f.Write([]byte("foo"))
f.Close()
reg, err := Open(f.Name())
if err != nil {
t.Fatal(err)
}
defer reg.Close()
names, err := reg.Readdirnames(-1)
if err == nil {
t.Error("Readdirnames succeeded; want non-nil error")
}
var pe *PathError
if !errors.As(err, &pe) || pe.Path != f.Name() {
t.Errorf("Readdirnames returned %q; want a PathError with path %q", err, f.Name())
}
if len(names) > 0 {
t.Errorf("unexpected dir names in regular file: %q", names)
}
}
func TestHardLink(t *testing.T) {
testenv.MustHaveLink(t)
defer chtmpdir(t)()
from, to := "hardlinktestfrom", "hardlinktestto"
file, err := Create(to)
if err != nil {
t.Fatalf("open %q failed: %v", to, err)
}
if err = file.Close(); err != nil {
t.Errorf("close %q failed: %v", to, err)
}
err = Link(to, from)
if err != nil {
t.Fatalf("link %q, %q failed: %v", to, from, err)
}
none := "hardlinktestnone"
err = Link(none, none)
// Check the returned error is well-formed.
if lerr, ok := err.(*LinkError); !ok || lerr.Error() == "" {
t.Errorf("link %q, %q failed to return a valid error", none, none)
}
tostat, err := Stat(to)
if err != nil {
t.Fatalf("stat %q failed: %v", to, err)
}
fromstat, err := Stat(from)
if err != nil {
t.Fatalf("stat %q failed: %v", from, err)
}
if !SameFile(tostat, fromstat) {
t.Errorf("link %q, %q did not create hard link", to, from)
}
// We should not be able to perform the same Link() a second time
err = Link(to, from)
switch err := err.(type) {
case *LinkError:
if err.Op != "link" {
t.Errorf("Link(%q, %q) err.Op = %q; want %q", to, from, err.Op, "link")
}
if err.Old != to {
t.Errorf("Link(%q, %q) err.Old = %q; want %q", to, from, err.Old, to)
}
if err.New != from {
t.Errorf("Link(%q, %q) err.New = %q; want %q", to, from, err.New, from)
}
if !IsExist(err.Err) {
t.Errorf("Link(%q, %q) err.Err = %q; want %q", to, from, err.Err, "file exists error")
}
case nil:
t.Errorf("link %q, %q: expected error, got nil", from, to)
default:
t.Errorf("link %q, %q: expected %T, got %T %v", from, to, new(LinkError), err, err)
}
}
// chtmpdir changes the working directory to a new temporary directory and
// provides a cleanup function.
func chtmpdir(t *testing.T) func() {
oldwd, err := Getwd()
if err != nil {
t.Fatalf("chtmpdir: %v", err)
}
d, err := os.MkdirTemp("", "test")
if err != nil {
t.Fatalf("chtmpdir: %v", err)
}
if err := Chdir(d); err != nil {
t.Fatalf("chtmpdir: %v", err)
}
return func() {
if err := Chdir(oldwd); err != nil {
t.Fatalf("chtmpdir: %v", err)
}
RemoveAll(d)
}
}
func TestSymlink(t *testing.T) {
testenv.MustHaveSymlink(t)
defer chtmpdir(t)()
from, to := "symlinktestfrom", "symlinktestto"
file, err := Create(to)
if err != nil {
t.Fatalf("Create(%q) failed: %v", to, err)
}
if err = file.Close(); err != nil {
t.Errorf("Close(%q) failed: %v", to, err)
}
err = Symlink(to, from)
if err != nil {
t.Fatalf("Symlink(%q, %q) failed: %v", to, from, err)
}
tostat, err := Lstat(to)
if err != nil {
t.Fatalf("Lstat(%q) failed: %v", to, err)
}
if tostat.Mode()&ModeSymlink != 0 {
t.Fatalf("Lstat(%q).Mode()&ModeSymlink = %v, want 0", to, tostat.Mode()&ModeSymlink)
}
fromstat, err := Stat(from)
if err != nil {
t.Fatalf("Stat(%q) failed: %v", from, err)
}
if !SameFile(tostat, fromstat) {
t.Errorf("Symlink(%q, %q) did not create symlink", to, from)
}
fromstat, err = Lstat(from)
if err != nil {
t.Fatalf("Lstat(%q) failed: %v", from, err)
}
if fromstat.Mode()&ModeSymlink == 0 {
t.Fatalf("Lstat(%q).Mode()&ModeSymlink = 0, want %v", from, ModeSymlink)
}
fromstat, err = Stat(from)
if err != nil {
t.Fatalf("Stat(%q) failed: %v", from, err)
}
if fromstat.Name() != from {
t.Errorf("Stat(%q).Name() = %q, want %q", from, fromstat.Name(), from)
}
if fromstat.Mode()&ModeSymlink != 0 {
t.Fatalf("Stat(%q).Mode()&ModeSymlink = %v, want 0", from, fromstat.Mode()&ModeSymlink)
}
s, err := Readlink(from)
if err != nil {
t.Fatalf("Readlink(%q) failed: %v", from, err)
}
if s != to {
t.Fatalf("Readlink(%q) = %q, want %q", from, s, to)
}
file, err = Open(from)
if err != nil {
t.Fatalf("Open(%q) failed: %v", from, err)
}
file.Close()
}
func TestLongSymlink(t *testing.T) {
testenv.MustHaveSymlink(t)
defer chtmpdir(t)()
s := "0123456789abcdef"
// Long, but not too long: a common limit is 255.
s = s + s + s + s + s + s + s + s + s + s + s + s + s + s + s
from := "longsymlinktestfrom"
err := Symlink(s, from)
if err != nil {
t.Fatalf("symlink %q, %q failed: %v", s, from, err)
}
r, err := Readlink(from)
if err != nil {
t.Fatalf("readlink %q failed: %v", from, err)
}
if r != s {
t.Fatalf("after symlink %q != %q", r, s)
}
}
func TestRename(t *testing.T) {
defer chtmpdir(t)()
from, to := "renamefrom", "renameto"
file, err := Create(from)
if err != nil {
t.Fatalf("open %q failed: %v", from, err)
}
if err = file.Close(); err != nil {
t.Errorf("close %q failed: %v", from, err)
}
err = Rename(from, to)
if err != nil {
t.Fatalf("rename %q, %q failed: %v", to, from, err)
}
_, err = Stat(to)
if err != nil {
t.Errorf("stat %q failed: %v", to, err)
}
}
func TestRenameOverwriteDest(t *testing.T) {
defer chtmpdir(t)()