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go / go / master / . / src / os / os_test.go
blob: 4470acd83b46cf41e908c6c9629942fdc070ee3e [file] [log] [blame]
// 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"
"log"
. "os"
"os/exec"
"path/filepath"
"runtime"
"runtime/debug"
"slices"
"strings"
"sync"
"syscall"
"testing"
"testing/fstest"
"time"
)
func TestMain(m *testing.M) {
if Getenv("GO_OS_TEST_DRAIN_STDIN") == "1" {
Stdout.Close()
io.Copy(io.Discard, Stdin)
Exit(0)
}
log.SetFlags(log.LstdFlags | log.Lshortfile)
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",
},
}
case "wasip1":
// wasmtime has issues resolving symbolic links that are often present
// in directories like /etc/group below (e.g. private/etc/group on OSX).
// For this reason we use files in the Go source tree instead.
return &sysDir{
runtime.GOROOT(),
[]string{
"go.env",
"LICENSE",
"CONTRIBUTING.md",
},
}
}
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.EqualFold(name1, name2)
default:
r = name1 == name2
}
return
}
func newFile(t *testing.T) (f *File) {
t.Helper()
f, err := CreateTemp("", "_Go_"+t.Name())
if err != nil {
t.Fatal(err)
}
t.Cleanup(func() {
if err := f.Close(); err != nil && !errors.Is(err, ErrClosed) {
t.Fatal(err)
}
if err := Remove(f.Name()); err != nil {
t.Fatal(err)
}
})
return
}
var sfdir = sysdir.name
var sfname = sysdir.files[0]
func TestStat(t *testing.T) {
t.Parallel()
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) {
t.Chdir(t.TempDir())
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)
t.Chdir(t.TempDir())
err := Symlink("x", "y")
if err != nil {
t.Fatal(err)
}
defer Remove("y")
err = Symlink("y", "x")
if err != nil {
t.Fatal(err)
}
defer Remove("x")
_, err = Stat("x")
if _, ok := err.(*fs.PathError); !ok {
t.Errorf("expected *PathError, got %T: %v\n", err, err)
}
}
func TestFstat(t *testing.T) {
t.Parallel()
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) {
t.Parallel()
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())
}
if dir.Mode()&ModeSymlink == 0 {
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) {
t.Parallel()
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) {
t.Parallel()
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 || e.Err != ErrClosed {
t.Fatalf("Read: got %T(%v), want %T(%v)", err, err, e, ErrClosed)
}
}
func testReaddirnames(dir string, contents []string) func(*testing.T) {
return func(t *testing.T) {
t.Parallel()
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) func(*testing.T) {
return func(t *testing.T) {
t.Parallel()
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) func(*testing.T) {
return func(t *testing.T) {
t.Parallel()
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) {
t.Parallel()
t.Run(".", testReaddirnames(".", dot))
t.Run("sysdir", testReaddirnames(sysdir.name, sysdir.files))
t.Run("TempDir", testReaddirnames(t.TempDir(), nil))
}
func TestFileReaddir(t *testing.T) {
t.Parallel()
t.Run(".", testReaddir(".", dot))
t.Run("sysdir", testReaddir(sysdir.name, sysdir.files))
t.Run("TempDir", testReaddir(t.TempDir(), nil))
}
func TestFileReadDir(t *testing.T) {
t.Parallel()
t.Run(".", testReadDir(".", dot))
t.Run("sysdir", testReadDir(sysdir.name, sysdir.files))
t.Run("TempDir", testReadDir(t.TempDir(), nil))
}
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) {
t.Parallel()
// big directory that doesn't change often.
dir := "/usr/bin"
switch runtime.GOOS {
case "android":
dir = "/system/bin"
case "ios", "wasip1":
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")
}
t.Parallel()
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)
}
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)
}
defer func() { *LstatP = Lstat }()
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"))
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()
}
slices.Sort(s)
return s
}
if got, want := names(mustReadDir("initial readdir")),
[]string{"good1", "good2", "x"}; !slices.Equal(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"}; !slices.Equal(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) {
t.Parallel()
f, err := CreateTemp(t.TempDir(), "_Go_ReaddirOfFile")
if err != nil {
t.Fatal(err)
}
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)
t.Chdir(t.TempDir())
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)
}
}
func TestSymlink(t *testing.T) {
testenv.MustHaveSymlink(t)
t.Chdir(t.TempDir())
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)
t.Chdir(t.TempDir())
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) {
t.Chdir(t.TempDir())
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) {
t.Chdir(t.TempDir())
from, to := "renamefrom", "renameto"
toData := []byte("to")
fromData := []byte("from")
err := WriteFile(to, toData, 0777)
if err != nil {
t.Fatalf("write file %q failed: %v", to, err)
}
err = WriteFile(from, fromData, 0777)
if err != nil {
t.Fatalf("write file %q failed: %v", from, err)
}
err = Rename(from, to)
if err != nil {
t.Fatalf("rename %q, %q failed: %v", to, from, err)
}
_, err = Stat(from)
if err == nil {
t.Errorf("from file %q still exists", from)
}
if err != nil && !IsNotExist(err) {
t.Fatalf("stat from: %v", err)
}
toFi, err := Stat(to)
if err != nil {
t.Fatalf("stat %q failed: %v", to, err)
}
if toFi.Size() != int64(len(fromData)) {
t.Errorf(`"to" size = %d; want %d (old "from" size)`, toFi.Size(), len(fromData))
}
}
func TestRenameFailed(t *testing.T) {
t.Chdir(t.TempDir())
from, to := "renamefrom", "renameto"
err := Rename(from, to)
switch err := err.(type) {
case *LinkError:
if err.Op != "rename" {
t.Errorf("rename %q, %q: err.Op: want %q, got %q", from, to, "rename", err.Op)
}
if err.Old != from {
t.Errorf("rename %q, %q: err.Old: want %q, got %q", from, to, from, err.Old)
}
if err.New != to {
t.Errorf("rename %q, %q: err.New: want %q, got %q", from, to, to, err.New)
}
case nil:
t.Errorf("rename %q, %q: expected error, got nil", from, to)
default:
t.Errorf("rename %q, %q: expected %T, got %T %v", from, to, new(LinkError), err, err)
}
}
func TestRenameNotExisting(t *testing.T) {
t.Chdir(t.TempDir())
from, to := "doesnt-exist", "dest"
Mkdir(to, 0777)
if err := Rename(from, to); !IsNotExist(err) {
t.Errorf("Rename(%q, %q) = %v; want an IsNotExist error", from, to, err)
}
}
func TestRenameToDirFailed(t *testing.T) {
t.Chdir(t.TempDir())
from, to := "renamefrom", "renameto"
Mkdir(from, 0777)
Mkdir(to, 0777)
err := Rename(from, to)
switch err := err.(type) {
case *LinkError:
if err.Op != "rename" {
t.Errorf("rename %q, %q: err.Op: want %q, got %q", from, to, "rename", err.Op)
}
if err.Old != from {
t.Errorf("rename %q, %q: err.Old: want %q, got %q", from, to, from, err.Old)
}
if err.New != to {
t.Errorf("rename %q, %q: err.New: want %q, got %q", from, to, to, err.New)
}
case nil:
t.Errorf("rename %q, %q: expected error, got nil", from, to)
default:
t.Errorf("rename %q, %q: expected %T, got %T %v", from, to, new(LinkError), err, err)
}
}
func TestRenameCaseDifference(pt *testing.T) {
from, to := "renameFROM", "RENAMEfrom"
tests := []struct {
name string
create func() error
}{
{"dir", func() error {
return Mkdir(from, 0777)
}},
{"file", func() error {
fd, err := Create(from)
if err != nil {
return err
}
return fd.Close()
}},
}
for _, test := range tests {
pt.Run(test.name, func(t *testing.T) {
t.Chdir(t.TempDir())
if err := test.create(); err != nil {
t.Fatalf("failed to create test file: %s", err)
}
if _, err := Stat(to); err != nil {
// Sanity check that the underlying filesystem is not case sensitive.
if IsNotExist(err) {
t.Skipf("case sensitive filesystem")
}
t.Fatalf("stat %q, got: %q", to, err)
}
if err := Rename(from, to); err != nil {
t.Fatalf("unexpected error when renaming from %q to %q: %s", from, to, err)
}
fd, err := Open(".")
if err != nil {
t.Fatalf("Open .: %s", err)
}
// Stat does not return the real case of the file (it returns what the called asked for)
// So we have to use readdir to get the real name of the file.
dirNames, err := fd.Readdirnames(-1)
fd.Close()
if err != nil {
t.Fatalf("readdirnames: %s", err)
}
if dirNamesLen := len(dirNames); dirNamesLen != 1 {
t.Fatalf("unexpected dirNames len, got %q, want %q", dirNamesLen, 1)
}
if dirNames[0] != to {
t.Errorf("unexpected name, got %q, want %q", dirNames[0], to)
}
})
}
}
func testStartProcess(dir, cmd string, args []string, expect string) func(t *testing.T) {
return func(t *testing.T) {
t.Parallel()
r, w, err := Pipe()
if err != nil {
t.Fatalf("Pipe: %v", err)
}
defer r.Close()
attr := &ProcAttr{Dir: dir, Files: []*File{nil, w, Stderr}}
p, err := StartProcess(cmd, args, attr)
if err != nil {
t.Fatalf("StartProcess: %v", err)
}
w.Close()
var b strings.Builder
io.Copy(&b, r)
output := b.String()
fi1, _ := Stat(strings.TrimSpace(output))
fi2, _ := Stat(expect)
if !SameFile(fi1, fi2) {
t.Errorf("exec %q returned %q wanted %q",
strings.Join(append([]string{cmd}, args...), " "), output, expect)
}
p.Wait()
}
}
func TestStartProcess(t *testing.T) {
testenv.MustHaveExec(t)
t.Parallel()
var dir, cmd string
var args []string
switch runtime.GOOS {
case "android":
t.Skip("android doesn't have /bin/pwd")
case "windows":
cmd = Getenv("COMSPEC")
dir = Getenv("SystemRoot")
args = []string{"/c", "cd"}
default:
var err error
cmd, err = exec.LookPath("pwd")
if err != nil {
t.Fatalf("Can't find pwd: %v", err)
}
dir = "/"
args = []string{}
t.Logf("Testing with %v", cmd)
}
cmddir, cmdbase := filepath.Split(cmd)
args = append([]string{cmdbase}, args...)
t.Run("absolute", testStartProcess(dir, cmd, args, dir))
t.Run("relative", testStartProcess(cmddir, cmdbase, args, cmddir))
}
func checkMode(t *testing.T, path string, mode FileMode) {
dir, err := Stat(path)
if err != nil {
t.Fatalf("Stat %q (looking for mode %#o): %s", path, mode, err)
}
if dir.Mode()&ModePerm != mode {
t.Errorf("Stat %q: mode %#o want %#o", path, dir.Mode(), mode)
}
}
func TestChmod(t *testing.T) {
// Chmod is not supported on wasip1.
if runtime.GOOS == "wasip1" {
t.Skip("Chmod is not supported on " + runtime.GOOS)
}
t.Parallel()
f := newFile(t)
// Creation mode is read write
fm := FileMode(0456)
if runtime.GOOS == "windows" {
fm = FileMode(0444) // read-only file
}
if err := Chmod(f.Name(), fm); err != nil {
t.Fatalf("chmod %s %#o: %s", f.Name(), fm, err)
}
checkMode(t, f.Name(), fm)
fm = FileMode(0123)
if runtime.GOOS == "windows" {
fm = FileMode(0666) // read-write file
}
if err := f.Chmod(fm); err != nil {
t.Fatalf("chmod %s %#o: %s", f.Name(), fm, err)
}
checkMode(t, f.Name(), fm)
}
func checkSize(t *testing.T, f *File, size int64) {
t.Helper()
dir, err := f.Stat()
if err != nil {
t.Fatalf("Stat %q (looking for size %d): %s", f.Name(), size, err)
}
if dir.Size() != size {
t.Errorf("Stat %q: size %d want %d", f.Name(), dir.Size(), size)
}
}
func TestFTruncate(t *testing.T) {
t.Parallel()
f := newFile(t)
checkSize(t, f, 0)
f.Write([]byte("hello, world\n"))
checkSize(t, f, 13)
f.Truncate(10)
checkSize(t, f, 10)
f.Truncate(1024)
checkSize(t, f, 1024)
f.Truncate(0)
checkSize(t, f, 0)
_, err := f.Write([]byte("surprise!"))
if err == nil {
checkSize(t, f, 13+9) // wrote at offset past where hello, world was.
}
}
func TestTruncate(t *testing.T) {
t.Parallel()
f := newFile(t)
checkSize(t, f, 0)
f.Write([]byte("hello, world\n"))
checkSize(t, f, 13)
Truncate(f.Name(), 10)
checkSize(t, f, 10)
Truncate(f.Name(), 1024)
checkSize(t, f, 1024)
Truncate(f.Name(), 0)
checkSize(t, f, 0)
_, err := f.Write([]byte("surprise!"))
if err == nil {
checkSize(t, f, 13+9) // wrote at offset past where hello, world was.
}
}
func TestTruncateNonexistentFile(t *testing.T) {
t.Parallel()
assertPathError := func(t testing.TB, path string, err error) {
t.Helper()
if pe, ok := err.(*PathError); !ok || !IsNotExist(err) || pe.Path != path {
t.Errorf("got error: %v\nwant an ErrNotExist PathError with path %q", err, path)
}
}
path := filepath.Join(t.TempDir(), "nonexistent")
err := Truncate(path, 1)
assertPathError(t, path, err)
// Truncate shouldn't create any new file.
_, err = Stat(path)
assertPathError(t, path, err)
}
var hasNoatime = sync.OnceValue(func() bool {
// A sloppy way to check if noatime flag is set (as all filesystems are
// checked, not just the one we're interested in). A correct way
// would be to use statvfs syscall and check if flags has ST_NOATIME,
// but the syscall is OS-specific and is not even wired into Go stdlib.
//
// Only used on NetBSD (which ignores explicit atime updates with noatime).
mounts, _ := ReadFile("/proc/mounts")
return bytes.Contains(mounts, []byte("noatime"))
})
func TestChtimes(t *testing.T) {
t.Parallel()
f := newFile(t)
// This should be an empty file (see #68687, #68663).
f.Close()
testChtimes(t, f.Name())
}
func TestChtimesOmit(t *testing.T) {
t.Parallel()
testChtimesOmit(t, true, false)
testChtimesOmit(t, false, true)
testChtimesOmit(t, true, true)
testChtimesOmit(t, false, false) // Same as TestChtimes.
}
func testChtimesOmit(t *testing.T, omitAt, omitMt bool) {
t.Logf("omit atime: %v, mtime: %v", omitAt, omitMt)
file := newFile(t)
// This should be an empty file (see #68687, #68663).
name := file.Name()
err := file.Close()
if err != nil {
t.Error(err)
}
fs, err := Stat(name)
if err != nil {
t.Fatal(err)
}
wantAtime := Atime(fs)
wantMtime := fs.ModTime()
switch runtime.GOOS {
case "js":
wantAtime = wantAtime.Truncate(time.Second)
wantMtime = wantMtime.Truncate(time.Second)
}
var setAtime, setMtime time.Time // Zero value means omit.
if !omitAt {
wantAtime = wantAtime.Add(-1 * time.Second)
setAtime = wantAtime
}
if !omitMt {
wantMtime = wantMtime.Add(-1 * time.Second)
setMtime = wantMtime
}
// Change the times accordingly.
if err := Chtimes(name, setAtime, setMtime); err != nil {
t.Error(err)
}
// Verify the expectations.
fs, err = Stat(name)
if err != nil {
t.Error(err)
}
gotAtime := Atime(fs)
gotMtime := fs.ModTime()
// TODO: remove the dragonfly omitAt && omitMt exceptions below once the
// fix (https://github.com/DragonFlyBSD/DragonFlyBSD/commit/c7c71870ed0)
// is available generally and on CI runners.
if !gotAtime.Equal(wantAtime) {
errormsg := fmt.Sprintf("atime mismatch, got: %q, want: %q", gotAtime, wantAtime)
switch runtime.GOOS {
case "plan9":
// Mtime is the time of the last change of content.
// Similarly, atime is set whenever the contents are
// accessed; also, it is set whenever mtime is set.
case "dragonfly":
if omitAt && omitMt {
t.Log(errormsg)
t.Log("Known DragonFly BSD issue (won't work when both times are omitted); ignoring.")
} else {
// Assume hammer2 fs; https://www.dragonflybsd.org/hammer/ says:
// > Because HAMMER2 is a block copy-on-write filesystem,
// > the "atime" field is not supported and will typically
// > just reflect local system in-memory caches or mtime.
//
// TODO: if only can CI define TMPDIR to point to a tmpfs
// (e.g. /var/run/shm), this exception can be removed.
t.Log(errormsg)
t.Log("Known DragonFly BSD issue (atime not supported on hammer2); ignoring.")
}
case "netbsd":
if !omitAt && hasNoatime() {
t.Log(errormsg)
t.Log("Known NetBSD issue (atime not changed on fs mounted with noatime); ignoring.")
} else {
t.Error(errormsg)
}
default:
t.Error(errormsg)
}
}
if !gotMtime.Equal(wantMtime) {
errormsg := fmt.Sprintf("mtime mismatch, got: %q, want: %q", gotMtime, wantMtime)
switch runtime.GOOS {
case "dragonfly":
if omitAt && omitMt {
t.Log(errormsg)
t.Log("Known DragonFly BSD issue (won't work when both times are omitted); ignoring.")
} else {
t.Error(errormsg)
}
default:
t.Error(errormsg)
}
}
}
func TestChtimesDir(t *testing.T) {
t.Parallel()
testChtimes(t, t.TempDir())
}
func testChtimes(t *testing.T, name string) {
st, err := Stat(name)
if err != nil {
t.Fatalf("Stat %s: %s", name, err)
}
preStat := st
// Move access and modification time back a second
at := Atime(preStat)
mt := preStat.ModTime()
err = Chtimes(name, at.Add(-time.Second), mt.Add(-time.Second))
if err != nil {
t.Fatalf("Chtimes %s: %s", name, err)
}
st, err = Stat(name)
if err != nil {
t.Fatalf("second Stat %s: %s", name, err)
}
postStat := st
pat := Atime(postStat)
pmt := postStat.ModTime()
if !pat.Before(at) {
errormsg := fmt.Sprintf("AccessTime didn't go backwards; was=%v, after=%v", at, pat)
switch runtime.GOOS {
case "plan9":
// Mtime is the time of the last change of
// content. Similarly, atime is set whenever
// the contents are accessed; also, it is set
// whenever mtime is set.
case "netbsd":
if hasNoatime() {
t.Log(errormsg)
t.Log("Known NetBSD issue (atime not changed on fs mounted with noatime); ignoring.")
} else {
t.Error(errormsg)
}
default:
t.Error(errormsg)
}
}
if !pmt.Before(mt) {
t.Errorf("ModTime didn't go backwards; was=%v, after=%v", mt, pmt)
}
}
func TestChtimesToUnixZero(t *testing.T) {
file := newFile(t)
fn := file.Name()
if _, err := file.Write([]byte("hi")); err != nil {
t.Fatal(err)
}
if err := file.Close(); err != nil {
t.Fatal(err)
}
unixZero := time.Unix(0, 0)
if err := Chtimes(fn, unixZero, unixZero); err != nil {
t.Fatalf("Chtimes failed: %v", err)
}
st, err := Stat(fn)
if err != nil {
t.Fatal(err)
}
if mt := st.ModTime(); mt != unixZero {
t.Errorf("mtime is %v, want %v", mt, unixZero)
}
}
func TestFileChdir(t *testing.T) {
wd, err := Getwd()
if err != nil {
t.Fatalf("Getwd: %s", err)
}
t.Chdir(".") // Ensure wd is restored after the test.
fd, err := Open(".")
if err != nil {
t.Fatalf("Open .: %s", err)
}
defer fd.Close()
if err := Chdir("/"); err != nil {
t.Fatalf("Chdir /: %s", err)
}
if err := fd.Chdir(); err != nil {
t.Fatalf("fd.Chdir: %s", err)
}
wdNew, err := Getwd()
if err != nil {
t.Fatalf("Getwd: %s", err)
}
wdInfo, err := fd.Stat()
if err != nil {
t.Fatal(err)
}
newInfo, err := Stat(wdNew)
if err != nil {
t.Fatal(err)
}
if !SameFile(wdInfo, newInfo) {
t.Fatalf("fd.Chdir failed: got %s, want %s", wdNew, wd)
}
}
func TestChdirAndGetwd(t *testing.T) {
t.Chdir(t.TempDir()) // Ensure wd is restored after the test.
// These are chosen carefully not to be symlinks on a Mac
// (unlike, say, /var, /etc), except /tmp, which we handle below.
dirs := []string{"/", "/usr/bin", "/tmp"}
// /usr/bin does not usually exist on Plan 9 or Android.
switch runtime.GOOS {
case "android":
dirs = []string{"/system/bin"}
case "plan9":
dirs = []string{"/", "/usr"}
case "ios", "windows", "wasip1":
dirs = nil
for _, dir := range []string{t.TempDir(), t.TempDir()} {
// Expand symlinks so path equality tests work.
dir, err := filepath.EvalSymlinks(dir)
if err != nil {
t.Fatalf("EvalSymlinks: %v", err)
}
dirs = append(dirs, dir)
}
}
for mode := 0; mode < 2; mode++ {
for _, d := range dirs {
var err error
if mode == 0 {
err = Chdir(d)
} else {
fd1, err1 := Open(d)
if err1 != nil {
t.Errorf("Open %s: %s", d, err1)
continue
}
err = fd1.Chdir()
fd1.Close()
}
if d == "/tmp" {
Setenv("PWD", "/tmp")
}
pwd, err1 := Getwd()
if err != nil {
t.Fatalf("Chdir %s: %s", d, err)
}
if err1 != nil {
t.Fatalf("Getwd in %s: %s", d, err1)
}
if !equal(pwd, d) {
t.Fatalf("Getwd returned %q want %q", pwd, d)
}
}
}
}
// Test that Chdir+Getwd is program-wide.
func TestProgWideChdir(t *testing.T) {
const N = 10
var wg sync.WaitGroup
hold := make(chan struct{})
done := make(chan struct{})
d := t.TempDir()
t.Chdir(d)
// Note the deferred Wait must be called after the deferred close(done),
// to ensure the N goroutines have been released even if the main goroutine
// calls Fatalf. It must be called before the Chdir back to the original
// directory, and before the deferred deletion implied by TempDir,
// so as not to interfere while the N goroutines are still running.
defer wg.Wait()
defer close(done)
for i := 0; i < N; i++ {
wg.Add(1)
go func(i int) {
defer wg.Done()
// Lock half the goroutines in their own operating system
// thread to exercise more scheduler possibilities.
if i%2 == 1 {
// On Plan 9, after calling LockOSThread, the goroutines
// run on different processes which don't share the working
// directory. This used to be an issue because Go expects
// the working directory to be program-wide.
// See issue 9428.
runtime.LockOSThread()
}
select {
case <-done:
return
case <-hold:
}
// Getwd might be wrong
f0, err := Stat(".")
if err != nil {
t.Error(err)
return
}
pwd, err := Getwd()
if err != nil {
t.Errorf("Getwd: %v", err)
return
}
if pwd != d {
t.Errorf("Getwd() = %q, want %q", pwd, d)
return
}
f1, err := Stat(pwd)
if err != nil {
t.Error(err)
return
}
if !SameFile(f0, f1) {
t.Errorf(`Samefile(Stat("."), Getwd()) reports false (%s != %s)`, f0.Name(), f1.Name())
return
}
}(i)
}
var err error
if err = Chdir(d); err != nil {
t.Fatalf("Chdir: %v", err)
}
// OS X sets TMPDIR to a symbolic link.
// So we resolve our working directory again before the test.
d, err = Getwd()
if err != nil {
t.Fatalf("Getwd: %v", err)
}
close(hold)
wg.Wait()
}
func TestSeek(t *testing.T) {
t.Parallel()
f := newFile(t)
const data = "hello, world\n"
io.WriteString(f, data)
type test struct {
in int64
whence int
out int64
}
var tests = []test{
{0, io.SeekCurrent, int64(len(data))},
{0, io.SeekStart, 0},
{5, io.SeekStart, 5},
{0, io.SeekEnd, int64(len(data))},
{0, io.SeekStart, 0},
{-1, io.SeekEnd, int64(len(data)) - 1},
{1 << 33, io.SeekStart, 1 << 33},
{1 << 33, io.SeekEnd, 1<<33 + int64(len(data))},
// Issue 21681, Windows 4G-1, etc:
{1<<32 - 1, io.SeekStart, 1<<32 - 1},
{0, io.SeekCurrent, 1<<32 - 1},
{2<<32 - 1, io.SeekStart, 2<<32 - 1},
{0, io.SeekCurrent, 2<<32 - 1},
}
for i, tt := range tests {
off, err := f.Seek(tt.in, tt.whence)
if off != tt.out || err != nil {
t.Errorf("#%d: Seek(%v, %v) = %v, %v want %v, nil", i, tt.in, tt.whence, off, err, tt.out)
}
}
}
func TestSeekError(t *testing.T) {
switch runtime.GOOS {
case "js", "plan9", "wasip1":
t.Skipf("skipping test on %v", runtime.GOOS)
}
t.Parallel()
r, w, err := Pipe()
if err != nil {
t.Fatal(err)
}
_, err = r.Seek(0, 0)
if err == nil {
t.Fatal("Seek on pipe should fail")
}
if perr, ok := err.(*PathError); !ok || perr.Err != syscall.ESPIPE {
t.Errorf("Seek returned error %v, want &PathError{Err: syscall.ESPIPE}", err)
}
_, err = w.Seek(0, 0)
if err == nil {
t.Fatal("Seek on pipe should fail")
}
if perr, ok := err.(*PathError); !ok || perr.Err != syscall.ESPIPE {
t.Errorf("Seek returned error %v, want &PathError{Err: syscall.ESPIPE}", err)
}
}
func TestOpenError(t *testing.T) {
t.Parallel()
dir := t.TempDir()
if err := WriteFile(filepath.Join(dir, "is-a-file"), nil, 0o666); err != nil {
t.Fatal(err)
}
if err := Mkdir(filepath.Join(dir, "is-a-dir"), 0o777); err != nil {
t.Fatal(err)
}
for _, tt := range []struct {
path string
mode int
error error
}{{
"no-such-file",
O_RDONLY,
syscall.ENOENT,
}, {
"is-a-dir",
O_WRONLY,
syscall.EISDIR,
}, {
"is-a-file/no-such-file",
O_WRONLY,
syscall.ENOTDIR,
}} {
path := filepath.Join(dir, tt.path)
f, err := OpenFile(path, tt.mode, 0)
if err == nil {
t.Errorf("Open(%q, %d) succeeded", tt.path, tt.mode)
f.Close()
continue
}
perr, ok := err.(*PathError)
if !ok {
t.Errorf("Open(%q, %d) returns error of %T type; want *PathError", tt.path, tt.mode, err)
}
if perr.Err != tt.error {
if runtime.GOOS == "plan9" {
syscallErrStr := perr.Err.Error()
expectedErrStr := strings.Replace(tt.error.Error(), "file ", "", 1)
if !strings.HasSuffix(syscallErrStr, expectedErrStr) {
// Some Plan 9 file servers incorrectly return
// EACCES rather than EISDIR when a directory is
// opened for write.
if tt.error == syscall.EISDIR && strings.HasSuffix(syscallErrStr, syscall.EACCES.Error()) {
continue
}
t.Errorf("Open(%q, %d) = _, %q; want suffix %q", tt.path, tt.mode, syscallErrStr, expectedErrStr)
}
continue
}
if runtime.GOOS == "dragonfly" {
// DragonFly incorrectly returns EACCES rather
// EISDIR when a directory is opened for write.
if tt.error == syscall.EISDIR && perr.Err == syscall.EACCES {
continue
}
}
t.Errorf("Open(%q, %d) = _, %q; want %q", tt.path, tt.mode, perr.Err.Error(), tt.error.Error())
}
}
}
func TestOpenNoName(t *testing.T) {
f, err := Open("")
if err == nil {
f.Close()
t.Fatal(`Open("") succeeded`)
}
}
func runBinHostname(t *testing.T) string {
// Run /bin/hostname and collect output.
r, w, err := Pipe()
if err != nil {
t.Fatal(err)
}
defer r.Close()
path, err := exec.LookPath("hostname")
if err != nil {
if errors.Is(err, exec.ErrNotFound) {
t.Skip("skipping test; test requires hostname but it does not exist")
}
t.Fatal(err)
}
argv := []string{"hostname"}
if runtime.GOOS == "aix" {
argv = []string{"hostname", "-s"}
}
p, err := StartProcess(path, argv, &ProcAttr{Files: []*File{nil, w, Stderr}})
if err != nil {
t.Fatal(err)
}
w.Close()
var b strings.Builder
io.Copy(&b, r)
_, err = p.Wait()
if err != nil {
t.Fatalf("run hostname Wait: %v", err)
}
err = p.Kill()
if err == nil {
t.Errorf("expected an error from Kill running 'hostname'")
}
output := b.String()
if n := len(output); n > 0 && output[n-1] == '\n' {
output = output[0 : n-1]
}
if output == "" {
t.Fatalf("/bin/hostname produced no output")
}
return output
}
func testWindowsHostname(t *testing.T, hostname string) {
cmd := testenv.Command(t, "hostname")
out, err := cmd.Output()
if err != nil {
t.Fatalf("Failed to execute hostname command: %v %s", err, out)
}
want := strings.Trim(string(out), "\r\n")
if hostname != want {
t.Fatalf("Hostname() = %q != system hostname of %q", hostname, want)
}
}
func TestHostname(t *testing.T) {
t.Parallel()
hostname, err := Hostname()
if err != nil {
t.Fatal(err)
}
if hostname == "" {
t.Fatal("Hostname returned empty string and no error")
}
if strings.Contains(hostname, "\x00") {
t.Fatalf("unexpected zero byte in hostname: %q", hostname)
}
// There is no other way to fetch hostname on windows, but via winapi.
// On Plan 9 it can be taken from #c/sysname as Hostname() does.
switch runtime.GOOS {
case "android", "plan9":
// No /bin/hostname to verify against.
return
case "windows":
testWindowsHostname(t, hostname)
return
}
testenv.MustHaveExec(t)
// Check internal Hostname() against the output of /bin/hostname.
// Allow that the internal Hostname returns a Fully Qualified Domain Name
// and the /bin/hostname only returns the first component
want := runBinHostname(t)
if hostname != want {
host, _, ok := strings.Cut(hostname, ".")
if !ok || host != want {
t.Errorf("Hostname() = %q, want %q", hostname, want)
}
}
}
func TestReadAt(t *testing.T) {
t.Parallel()
f := newFile(t)
const data = "hello, world\n"
io.WriteString(f, data)
b := make([]byte, 5)
n, err := f.ReadAt(b, 7)
if err != nil || n != len(b) {
t.Fatalf("ReadAt 7: %d, %v", n, err)
}
if string(b) != "world" {
t.Fatalf("ReadAt 7: have %q want %q", string(b), "world")
}
}
// Verify that ReadAt doesn't affect seek offset.
// In the Plan 9 kernel, there used to be a bug in the implementation of
// the pread syscall, where the channel offset was erroneously updated after
// calling pread on a file.
func TestReadAtOffset(t *testing.T) {
t.Parallel()
f := newFile(t)
const data = "hello, world\n"
io.WriteString(f, data)
f.Seek(0, 0)
b := make([]byte, 5)
n, err := f.ReadAt(b, 7)
if err != nil || n != len(b) {
t.Fatalf("ReadAt 7: %d, %v", n, err)
}
if string(b) != "world" {
t.Fatalf("ReadAt 7: have %q want %q", string(b), "world")
}
n, err = f.Read(b)
if err != nil || n != len(b) {
t.Fatalf("Read: %d, %v", n, err)
}
if string(b) != "hello" {
t.Fatalf("Read: have %q want %q", string(b), "hello")
}
}
// Verify that ReadAt doesn't allow negative offset.
func TestReadAtNegativeOffset(t *testing.T) {
t.Parallel()
f := newFile(t)
const data = "hello, world\n"
io.WriteString(f, data)
f.Seek(0, 0)
b := make([]byte, 5)
n, err := f.ReadAt(b, -10)
const wantsub = "negative offset"
if !strings.Contains(fmt.Sprint(err), wantsub) || n != 0 {
t.Errorf("ReadAt(-10) = %v, %v; want 0, ...%q...", n, err, wantsub)
}
}
func TestWriteAt(t *testing.T) {
t.Parallel()
f := newFile(t)
const data = "hello, world\n"
io.WriteString(f, data)
n, err := f.WriteAt([]byte("WORLD"), 7)
if err != nil || n != 5 {
t.Fatalf("WriteAt 7: %d, %v", n, err)
}
b, err := ReadFile(f.Name())
if err != nil {
t.Fatalf("ReadFile %s: %v", f.Name(), err)
}
if string(b) != "hello, WORLD\n" {
t.Fatalf("after write: have %q want %q", string(b), "hello, WORLD\n")
}
}
// Verify that WriteAt doesn't allow negative offset.
func TestWriteAtNegativeOffset(t *testing.T) {
t.Parallel()
f := newFile(t)
n, err := f.WriteAt([]byte("WORLD"), -10)
const wantsub = "negative offset"
if !strings.Contains(fmt.Sprint(err), wantsub) || n != 0 {
t.Errorf("WriteAt(-10) = %v, %v; want 0, ...%q...", n, err, wantsub)
}
}
// Verify that WriteAt doesn't work in append mode.
func TestWriteAtInAppendMode(t *testing.T) {
t.Chdir(t.TempDir())
f, err := OpenFile("write_at_in_append_mode.txt", O_APPEND|O_CREATE, 0666)
if err != nil {
t.Fatalf("OpenFile: %v", err)
}
defer f.Close()
_, err = f.WriteAt([]byte(""), 1)
if err != ErrWriteAtInAppendMode {
t.Fatalf("f.WriteAt returned %v, expected %v", err, ErrWriteAtInAppendMode)
}
}
func writeFile(t *testing.T, fname string, flag int, text string) string {
f, err := OpenFile(fname, flag, 0666)
if err != nil {
t.Fatalf("Open: %v", err)
}
n, err := io.WriteString(f, text)
if err != nil {
t.Fatalf("WriteString: %d, %v", n, err)
}
f.Close()
data, err := ReadFile(fname)
if err != nil {
t.Fatalf("ReadFile: %v", err)
}
return string(data)
}
func TestAppend(t *testing.T) {
t.Chdir(t.TempDir())
const f = "append.txt"
s := writeFile(t, f, O_CREATE|O_TRUNC|O_RDWR, "new")
if s != "new" {
t.Fatalf("writeFile: have %q want %q", s, "new")
}
s = writeFile(t, f, O_APPEND|O_RDWR, "|append")
if s != "new|append" {
t.Fatalf("writeFile: have %q want %q", s, "new|append")
}
s = writeFile(t, f, O_CREATE|O_APPEND|O_RDWR, "|append")
if s != "new|append|append" {
t.Fatalf("writeFile: have %q want %q", s, "new|append|append")
}
err := Remove(f)
if err != nil {
t.Fatalf("Remove: %v", err)
}
s = writeFile(t, f, O_CREATE|O_APPEND|O_RDWR, "new&append")
if s != "new&append" {
t.Fatalf("writeFile: after append have %q want %q", s, "new&append")
}
s = writeFile(t, f, O_CREATE|O_RDWR, "old")
if s != "old&append" {
t.Fatalf("writeFile: after create have %q want %q", s, "old&append")
}
s = writeFile(t, f, O_CREATE|O_TRUNC|O_RDWR, "new")
if s != "new" {
t.Fatalf("writeFile: after truncate have %q want %q", s, "new")
}
}
func TestStatDirWithTrailingSlash(t *testing.T) {
t.Parallel()
// Create new temporary directory and arrange to clean it up.
path := t.TempDir()
// Stat of path should succeed.
if _, err := Stat(path); err != nil {
t.Fatalf("stat %s failed: %s", path, err)
}
// Stat of path+"/" should succeed too.
path += "/"
if _, err := Stat(path); err != nil {
t.Fatalf("stat %s failed: %s", path, err)
}
}
func TestNilProcessStateString(t *testing.T) {
var ps *ProcessState
s := ps.String()
if s != "<nil>" {
t.Errorf("(*ProcessState)(nil).String() = %q, want %q", s, "<nil>")
}
}
func TestSameFile(t *testing.T) {
t.Chdir(t.TempDir())
fa, err := Create("a")
if err != nil {
t.Fatalf("Create(a): %v", err)
}
fa.Close()
fb, err := Create("b")
if err != nil {
t.Fatalf("Create(b): %v", err)
}
fb.Close()
ia1, err := Stat("a")
if err != nil {
t.Fatalf("Stat(a): %v", err)
}
ia2, err := Stat("a")
if err != nil {
t.Fatalf("Stat(a): %v", err)
}
if !SameFile(ia1, ia2) {
t.Errorf("files should be same")
}
ib, err := Stat("b")
if err != nil {
t.Fatalf("Stat(b): %v", err)
}
if SameFile(ia1, ib) {
t.Errorf("files should be different")
}
}
func testDevNullFileInfo(t *testing.T, statname, devNullName string, fi FileInfo) {
pre := fmt.Sprintf("%s(%q): ", statname, devNullName)
if fi.Size() != 0 {
t.Errorf(pre+"wrong file size have %d want 0", fi.Size())
}
if fi.Mode()&ModeDevice == 0 {
t.Errorf(pre+"wrong file mode %q: ModeDevice is not set", fi.Mode())
}
if fi.Mode()&ModeCharDevice == 0 {
t.Errorf(pre+"wrong file mode %q: ModeCharDevice is not set", fi.Mode())
}
if fi.Mode().IsRegular() {
t.Errorf(pre+"wrong file mode %q: IsRegular returns true", fi.Mode())
}
}
func testDevNullFile(t *testing.T, devNullName string) {
f, err := Open(devNullName)
if err != nil {
t.Fatalf("Open(%s): %v", devNullName, err)
}
defer f.Close()
fi, err := f.Stat()
if err != nil {
t.Fatalf("Stat(%s): %v", devNullName, err)
}
testDevNullFileInfo(t, "f.Stat", devNullName, fi)
fi, err = Stat(devNullName)
if err != nil {
t.Fatalf("Stat(%s): %v", devNullName, err)
}
testDevNullFileInfo(t, "Stat", devNullName, fi)
}
func TestDevNullFile(t *testing.T) {
t.Parallel()
testDevNullFile(t, DevNull)
if runtime.GOOS == "windows" {
testDevNullFile(t, "./nul")
testDevNullFile(t, "//./nul")
}
}
var testLargeWrite = flag.Bool("large_write", false, "run TestLargeWriteToConsole test that floods console with output")
func TestLargeWriteToConsole(t *testing.T) {
if !*testLargeWrite {
t.Skip("skipping console-flooding test; enable with -large_write")
}
b := make([]byte, 32000)
for i := range b {
b[i] = '.'
}
b[len(b)-1] = '\n'
n, err := Stdout.Write(b)
if err != nil {
t.Fatalf("Write to os.Stdout failed: %v", err)
}
if n != len(b) {
t.Errorf("Write to os.Stdout should return %d; got %d", len(b), n)
}
n, err = Stderr.Write(b)
if err != nil {
t.Fatalf("Write to os.Stderr failed: %v", err)
}
if n != len(b) {
t.Errorf("Write to os.Stderr should return %d; got %d", len(b), n)
}
}
func TestStatDirModeExec(t *testing.T) {
if runtime.GOOS == "wasip1" {
t.Skip("Chmod is not supported on " + runtime.GOOS)
}
t.Parallel()
const mode = 0111
path := t.TempDir()
if err := Chmod(path, 0777); err != nil {
t.Fatalf("Chmod %q 0777: %v", path, err)
}
dir, err := Stat(path)
if err != nil {
t.Fatalf("Stat %q (looking for mode %#o): %s", path, mode, err)
}
if dir.Mode()&mode != mode {
t.Errorf("Stat %q: mode %#o want %#o", path, dir.Mode()&mode, mode)
}
}
func TestStatStdin(t *testing.T) {
switch runtime.GOOS {
case "android", "plan9":
t.Skipf("%s doesn't have /bin/sh", runtime.GOOS)
}
if Getenv("GO_WANT_HELPER_PROCESS") == "1" {
st, err := Stdin.Stat()
if err != nil {
t.Fatalf("Stat failed: %v", err)
}
fmt.Println(st.Mode() & ModeNamedPipe)
Exit(0)
}
t.Parallel()
exe := testenv.Executable(t)
fi, err := Stdin.Stat()
if err != nil {
t.Fatal(err)
}
switch mode := fi.Mode(); {
case mode&ModeCharDevice != 0 && mode&ModeDevice != 0:
case mode&ModeNamedPipe != 0:
default:
t.Fatalf("unexpected Stdin mode (%v), want ModeCharDevice or ModeNamedPipe", mode)
}
cmd := testenv.Command(t, exe, "-test.run=^TestStatStdin$")
cmd = testenv.CleanCmdEnv(cmd)
cmd.Env = append(cmd.Env, "GO_WANT_HELPER_PROCESS=1")
// This will make standard input a pipe.
cmd.Stdin = strings.NewReader("output")
output, err := cmd.CombinedOutput()
if err != nil {
t.Fatalf("Failed to spawn child process: %v %q", err, string(output))
}
// result will be like "prw-rw-rw"
if len(output) < 1 || output[0] != 'p' {
t.Fatalf("Child process reports stdin is not pipe '%v'", string(output))
}
}
func TestStatRelativeSymlink(t *testing.T) {
testenv.MustHaveSymlink(t)
t.Parallel()
tmpdir := t.TempDir()
target := filepath.Join(tmpdir, "target")
f, err := Create(target)
if err != nil {
t.Fatal(err)
}
defer f.Close()
st, err := f.Stat()
if err != nil {
t.Fatal(err)
}
link := filepath.Join(tmpdir, "link")
err = Symlink(filepath.Base(target), link)
if err != nil {
t.Fatal(err)
}
st1, err := Stat(link)
if err != nil {
t.Fatal(err)
}
if !SameFile(st, st1) {
t.Error("Stat doesn't follow relative symlink")
}
if runtime.GOOS == "windows" {
Remove(link)
err = Symlink(target[len(filepath.VolumeName(target)):], link)
if err != nil {
t.Fatal(err)
}
st1, err := Stat(link)
if err != nil {
t.Fatal(err)
}
if !SameFile(st, st1) {
t.Error("Stat doesn't follow relative symlink")
}
}
}
func TestReadAtEOF(t *testing.T) {
t.Parallel()
f := newFile(t)
_, err := f.ReadAt(make([]byte, 10), 0)
switch err {
case io.EOF:
// all good
case nil:
t.Fatalf("ReadAt succeeded")
default:
t.Fatalf("ReadAt failed: %s", err)
}
}
func TestLongPath(t *testing.T) {
t.Parallel()
tmpdir := t.TempDir()
// Test the boundary of 247 and fewer bytes (normal) and 248 and more bytes (adjusted).
sizes := []int{247, 248, 249, 400}
for len(tmpdir) < 400 {
tmpdir += "/dir3456789"
}
for _, sz := range sizes {
t.Run(fmt.Sprintf("length=%d", sz), func(t *testing.T) {
sizedTempDir := tmpdir[:sz-1] + "x" // Ensure it does not end with a slash.
// The various sized runs are for this call to trigger the boundary
// condition.
if err := MkdirAll(sizedTempDir, 0755); err != nil {
t.Fatalf("MkdirAll failed: %v", err)
}
data := []byte("hello world\n")
if err := WriteFile(sizedTempDir+"/foo.txt", data, 0644); err != nil {
t.Fatalf("os.WriteFile() failed: %v", err)
}
if err := Rename(sizedTempDir+"/foo.txt", sizedTempDir+"/bar.txt"); err != nil {
t.Fatalf("Rename failed: %v", err)
}
mtime := time.Now().Truncate(time.Minute)
if err := Chtimes(sizedTempDir+"/bar.txt", mtime, mtime); err != nil {
t.Fatalf("Chtimes failed: %v", err)
}
names := []string{"bar.txt"}
if testenv.HasSymlink() {
if err := Symlink(sizedTempDir+"/bar.txt", sizedTempDir+"/symlink.txt"); err != nil {
t.Fatalf("Symlink failed: %v", err)
}
names = append(names, "symlink.txt")
}
if testenv.HasLink() {
if err := Link(sizedTempDir+"/bar.txt", sizedTempDir+"/link.txt"); err != nil {
t.Fatalf("Link failed: %v", err)
}
names = append(names, "link.txt")
}
for _, wantSize := range []int64{int64(len(data)), 0} {
for _, name := range names {
path := sizedTempDir + "/" + name
dir, err := Stat(path)
if err != nil {
t.Fatalf("Stat(%q) failed: %v", path, err)
}
filesize := size(path, t)
if dir.Size() != filesize || filesize != wantSize {
t.Errorf("Size(%q) is %d, len(ReadFile()) is %d, want %d", path, dir.Size(), filesize, wantSize)
}
if runtime.GOOS != "wasip1" { // Chmod is not supported on wasip1
err = Chmod(path, dir.Mode())
if err != nil {
t.Fatalf("Chmod(%q) failed: %v", path, err)
}
}
}
if err := Truncate(sizedTempDir+"/bar.txt", 0); err != nil {
t.Fatalf("Truncate failed: %v", err)
}
}
})
}
}
func testKillProcess(t *testing.T, processKiller func(p *Process)) {
t.Parallel()
// Re-exec the test binary to start a process that hangs until stdin is closed.
cmd := testenv.Command(t, testenv.Executable(t))
cmd.Env = append(cmd.Environ(), "GO_OS_TEST_DRAIN_STDIN=1")
stdout, err := cmd.StdoutPipe()
if err != nil {
t.Fatal(err)
}
stdin, err := cmd.StdinPipe()
if err != nil {
t.Fatal(err)
}
err = cmd.Start()
if err != nil {
t.Fatalf("Failed to start test process: %v", err)
}
defer func() {
if err := cmd.Wait(); err == nil {
t.Errorf("Test process succeeded, but expected to fail")
}
stdin.Close() // Keep stdin alive until the process has finished dying.
}()
// Wait for the process to be started.
// (It will close its stdout when it reaches TestMain.)
io.Copy(io.Discard, stdout)
processKiller(cmd.Process)
}
func TestKillStartProcess(t *testing.T) {
testKillProcess(t, func(p *Process) {
err := p.Kill()
if err != nil {
t.Fatalf("Failed to kill test process: %v", err)
}
})
}
func TestGetppid(t *testing.T) {
if runtime.GOOS == "plan9" {
// TODO: golang.org/issue/8206
t.Skipf("skipping test on plan9; see issue 8206")
}
if Getenv("GO_WANT_HELPER_PROCESS") == "1" {
fmt.Print(Getppid())
Exit(0)
}
t.Parallel()
cmd := testenv.Command(t, testenv.Executable(t), "-test.run=^TestGetppid$")
cmd.Env = append(Environ(), "GO_WANT_HELPER_PROCESS=1")
// verify that Getppid() from the forked process reports our process id
output, err := cmd.CombinedOutput()
if err != nil {
t.Fatalf("Failed to spawn child process: %v %q", err, string(output))
}
childPpid := string(output)
ourPid := fmt.Sprintf("%d", Getpid())
if childPpid != ourPid {
t.Fatalf("Child process reports parent process id '%v', expected '%v'", childPpid, ourPid)
}
}
func TestKillFindProcess(t *testing.T) {
testKillProcess(t, func(p *Process) {
p2, err := FindProcess(p.Pid)
if err != nil {
t.Fatalf("Failed to find test process: %v", err)
}
err = p2.Kill()
if err != nil {
t.Fatalf("Failed to kill test process: %v", err)
}
})
}
var nilFileMethodTests = []struct {
name string
f func(*File) error
}{
{"Chdir", func(f *File) error { return f.Chdir() }},
{"Close", func(f *File) error { return f.Close() }},
{"Chmod", func(f *File) error { return f.Chmod(0) }},
{"Chown", func(f *File) error { return f.Chown(0, 0) }},
{"Read", func(f *File) error { _, err := f.Read(make([]byte, 0)); return err }},
{"ReadAt", func(f *File) error { _, err := f.ReadAt(make([]byte, 0), 0); return err }},
{"Readdir", func(f *File) error { _, err := f.Readdir(1); return err }},
{"Readdirnames", func(f *File) error { _, err := f.Readdirnames(1); return err }},
{"Seek", func(f *File) error { _, err := f.Seek(0, io.SeekStart); return err }},
{"Stat", func(f *File) error { _, err := f.Stat(); return err }},
{"Sync", func(f *File) error { return f.Sync() }},
{"Truncate", func(f *File) error { return f.Truncate(0) }},
{"Write", func(f *File) error { _, err := f.Write(make([]byte, 0)); return err }},
{"WriteAt", func(f *File) error { _, err := f.WriteAt(make([]byte, 0), 0); return err }},
{"WriteString", func(f *File) error { _, err := f.WriteString(""); return err }},
}
// Test that all File methods give ErrInvalid if the receiver is nil.
func TestNilFileMethods(t *testing.T) {
t.Parallel()
for _, tt := range nilFileMethodTests {
var file *File
got := tt.f(file)
if got != ErrInvalid {
t.Errorf("%v should fail when f is nil; got %v", tt.name, got)
}
}
}
func mkdirTree(t *testing.T, root string, level, max int) {
if level >= max {
return
}
level++
for i := 'a'; i < 'c'; i++ {
dir := filepath.Join(root, string(i))
if err := Mkdir(dir, 0700); err != nil {
t.Fatal(err)
}
mkdirTree(t, dir, level, max)
}
}
// Test that simultaneous RemoveAll do not report an error.
// As long as it gets removed, we should be happy.
func TestRemoveAllRace(t *testing.T) {
if runtime.GOOS == "windows" {
// Windows has very strict rules about things like
// removing directories while someone else has
// them open. The racing doesn't work out nicely
// like it does on Unix.
t.Skip("skipping on windows")
}
if runtime.GOOS == "dragonfly" {
testenv.SkipFlaky(t, 52301)
}
n := runtime.GOMAXPROCS(16)
defer runtime.GOMAXPROCS(n)
root := t.TempDir()
mkdirTree(t, root, 1, 6)
hold := make(chan struct{})
var wg sync.WaitGroup
for i := 0; i < 4; i++ {
wg.Add(1)
go func() {
defer wg.Done()
<-hold
err := RemoveAll(root)
if err != nil {
t.Errorf("unexpected error: %T, %q", err, err)
}
}()
}
close(hold) // let workers race to remove root
wg.Wait()
}
// Test that reading from a pipe doesn't use up a thread.
func TestPipeThreads(t *testing.T) {
switch runtime.GOOS {
case "aix":
t.Skip("skipping on aix; issue 70131")
case "illumos", "solaris":
t.Skip("skipping on Solaris and illumos; issue 19111")
case "windows":
t.Skip("skipping on Windows; issue 19098")
case "plan9":
t.Skip("skipping on Plan 9; does not support runtime poller")
case "js":
t.Skip("skipping on js; no support for os.Pipe")
case "wasip1":
t.Skip("skipping on wasip1; no support for os.Pipe")
}
threads := 100
r := make([]*File, threads)
w := make([]*File, threads)
for i := 0; i < threads; i++ {
rp, wp, err := Pipe()
if err != nil {
for j := 0; j < i; j++ {
r[j].Close()
w[j].Close()
}
t.Fatal(err)
}
r[i] = rp
w[i] = wp
}
defer debug.SetMaxThreads(debug.SetMaxThreads(threads / 2))
creading := make(chan bool, threads)
cdone := make(chan bool, threads)
for i := 0; i < threads; i++ {
go func(i int) {
var b [1]byte
creading <- true
if _, err := r[i].Read(b[:]); err != nil {
t.Error(err)
}
if err := r[i].Close(); err != nil {
t.Error(err)
}
cdone <- true
}(i)
}
for i := 0; i < threads; i++ {
<-creading
}
// If we are still alive, it means that the 100 goroutines did
// not require 100 threads.
for i := 0; i < threads; i++ {
if _, err := w[i].Write([]byte{0}); err != nil {
t.Error(err)
}
if err := w[i].Close(); err != nil {
t.Error(err)
}
<-cdone
}
}
func testDoubleCloseError(path string) func(*testing.T) {
return func(t *testing.T) {
t.Parallel()
file, err := Open(path)
if err != nil {
t.Fatal(err)
}
if err := file.Close(); err != nil {
t.Fatalf("unexpected error from Close: %v", err)
}
if err := file.Close(); err == nil {
t.Error("second Close did not fail")
} else if pe, ok := err.(*PathError); !ok {
t.Errorf("second Close: got %T, want %T", err, pe)
} else if pe.Err != ErrClosed {
t.Errorf("second Close: got %q, want %q", pe.Err, ErrClosed)
} else {
t.Logf("second close returned expected error %q", err)
}
}
}
func TestDoubleCloseError(t *testing.T) {
t.Parallel()
t.Run("file", testDoubleCloseError(filepath.Join(sfdir, sfname)))
t.Run("dir", testDoubleCloseError(sfdir))
}
func TestUserCacheDir(t *testing.T) {
t.Parallel()
dir, err := UserCacheDir()
if err != nil {
t.Skipf("skipping: %v", err)
}
if dir == "" {
t.Fatalf("UserCacheDir returned %q; want non-empty path or error", dir)
}
fi, err := Stat(dir)
if err != nil {
if IsNotExist(err) {
t.Log(err)
return
}
t.Fatal(err)
}
if !fi.IsDir() {
t.Fatalf("dir %s is not directory; type = %v", dir, fi.Mode())
}
}
func TestUserCacheDirXDGConfigDirEnvVar(t *testing.T) {
switch runtime.GOOS {
case "windows", "darwin", "plan9":
t.Skip("$XDG_CACHE_HOME is effective only on Unix systems")
}
wd, err := Getwd()
if err != nil {
t.Fatal(err)
}
t.Setenv("XDG_CACHE_HOME", wd)
dir, err := UserCacheDir()
if err != nil {
t.Fatal(err)
}
if dir != wd {
t.Fatalf("UserCacheDir returned %q; want the value of $XDG_CACHE_HOME %q", dir, wd)
}
t.Setenv("XDG_CACHE_HOME", "some-dir")
_, err = UserCacheDir()
if err == nil {
t.Fatal("UserCacheDir succeeded though $XDG_CACHE_HOME contains a relative path")
}
}
func TestUserConfigDir(t *testing.T) {
t.Parallel()
dir, err := UserConfigDir()
if err != nil {
t.Skipf("skipping: %v", err)
}
if dir == "" {
t.Fatalf("UserConfigDir returned %q; want non-empty path or error", dir)
}
fi, err := Stat(dir)
if err != nil {
if IsNotExist(err) {
t.Log(err)
return
}
t.Fatal(err)
}
if !fi.IsDir() {
t.Fatalf("dir %s is not directory; type = %v", dir, fi.Mode())
}
}
func TestUserConfigDirXDGConfigDirEnvVar(t *testing.T) {
switch runtime.GOOS {
case "windows", "darwin", "plan9":
t.Skip("$XDG_CONFIG_HOME is effective only on Unix systems")
}
wd, err := Getwd()
if err != nil {
t.Fatal(err)
}
t.Setenv("XDG_CONFIG_HOME", wd)
dir, err := UserConfigDir()
if err != nil {
t.Fatal(err)
}
if dir != wd {
t.Fatalf("UserConfigDir returned %q; want the value of $XDG_CONFIG_HOME %q", dir, wd)
}
t.Setenv("XDG_CONFIG_HOME", "some-dir")
_, err = UserConfigDir()
if err == nil {
t.Fatal("UserConfigDir succeeded though $XDG_CONFIG_HOME contains a relative path")
}
}
func TestUserHomeDir(t *testing.T) {
t.Parallel()
dir, err := UserHomeDir()
if dir == "" && err == nil {
t.Fatal("UserHomeDir returned an empty string but no error")
}
if err != nil {
// UserHomeDir may return a non-nil error if the environment variable
// for the home directory is empty or unset in the environment.
t.Skipf("skipping: %v", err)
}
fi, err := Stat(dir)
if err != nil {
if IsNotExist(err) {
// The user's home directory has a well-defined location, but does not
// exist. (Maybe nothing has written to it yet? That could happen, for
// example, on minimal VM images used for CI testing.)
t.Log(err)
return
}
t.Fatal(err)
}
if !fi.IsDir() {
t.Fatalf("dir %s is not directory; type = %v", dir, fi.Mode())
}
}
func TestDirSeek(t *testing.T) {
t.Parallel()
wd, err := Getwd()
if err != nil {
t.Fatal(err)
}
f, err := Open(wd)
if err != nil {
t.Fatal(err)
}
dirnames1, err := f.Readdirnames(0)
if err != nil {
t.Fatal(err)
}
ret, err := f.Seek(0, 0)
if err != nil {
t.Fatal(err)
}
if ret != 0 {
t.Fatalf("seek result not zero: %d", ret)
}
dirnames2, err := f.Readdirnames(0)
if err != nil {
t.Fatal(err)
}
if len(dirnames1) != len(dirnames2) {
t.Fatalf("listings have different lengths: %d and %d\n", len(dirnames1), len(dirnames2))
}
for i, n1 := range dirnames1 {
n2 := dirnames2[i]
if n1 != n2 {
t.Fatalf("different name i=%d n1=%s n2=%s\n", i, n1, n2)
}
}
}
func TestReaddirSmallSeek(t *testing.T) {
// See issue 37161. Read only one entry from a directory,
// seek to the beginning, and read again. We should not see
// duplicate entries.
t.Parallel()
wd, err := Getwd()
if err != nil {
t.Fatal(err)
}
df, err := Open(filepath.Join(wd, "testdata", "issue37161"))
if err != nil {
t.Fatal(err)
}
names1, err := df.Readdirnames(1)
if err != nil {
t.Fatal(err)
}
if _, err = df.Seek(0, 0); err != nil {
t.Fatal(err)
}
names2, err := df.Readdirnames(0)
if err != nil {
t.Fatal(err)
}
if len(names2) != 3 {
t.Fatalf("first names: %v, second names: %v", names1, names2)
}
}
// isDeadlineExceeded reports whether err is or wraps ErrDeadlineExceeded.
// We also check that the error has a Timeout method that returns true.
func isDeadlineExceeded(err error) bool {
if !IsTimeout(err) {
return false
}
if !errors.Is(err, ErrDeadlineExceeded) {
return false
}
return true
}
// Test that opening a file does not change its permissions. Issue 38225.
func TestOpenFileKeepsPermissions(t *testing.T) {
t.Parallel()
dir := t.TempDir()
name := filepath.Join(dir, "x")
f, err := Create(name)
if err != nil {
t.Fatal(err)
}
if err := f.Close(); err != nil {
t.Error(err)
}
f, err = OpenFile(name, O_WRONLY|O_CREATE|O_TRUNC, 0)
if err != nil {
t.Fatal(err)
}
if fi, err := f.Stat(); err != nil {
t.Error(err)
} else if fi.Mode()&0222 == 0 {
t.Errorf("f.Stat.Mode after OpenFile is %v, should be writable", fi.Mode())
}
if err := f.Close(); err != nil {
t.Error(err)
}
if fi, err := Stat(name); err != nil {
t.Error(err)
} else if fi.Mode()&0222 == 0 {
t.Errorf("Stat after OpenFile is %v, should be writable", fi.Mode())
}
}
func forceMFTUpdateOnWindows(t *testing.T, path string) {
t.Helper()
if runtime.GOOS != "windows" {
return
}
// On Windows, we force the MFT to update by reading the actual metadata from GetFileInformationByHandle and then
// explicitly setting that. Otherwise it might get out of sync with FindFirstFile. See golang.org/issues/42637.
if err := filepath.WalkDir(path, func(path string, d fs.DirEntry, err error) error {
if err != nil {
t.Fatal(err)
}
info, err := d.Info()
if err != nil {
t.Fatal(err)
}
stat, err := Stat(path) // This uses GetFileInformationByHandle internally.
if err != nil {
t.Fatal(err)
}
if stat.ModTime() == info.ModTime() {
return nil
}
if err := Chtimes(path, stat.ModTime(), stat.ModTime()); err != nil {
t.Log(err) // We only log, not die, in case the test directory is not writable.
}
return nil
}); err != nil {
t.Fatal(err)
}
}
func TestDirFS(t *testing.T) {
t.Parallel()
forceMFTUpdateOnWindows(t, "./testdata/dirfs")
fsys := DirFS("./testdata/dirfs")
if err := fstest.TestFS(fsys, "a", "b", "dir/x"); err != nil {
t.Fatal(err)
}
rdfs, ok := fsys.(fs.ReadDirFS)
if !ok {
t.Error("expected DirFS result to implement fs.ReadDirFS")
}
if _, err := rdfs.ReadDir("nonexistent"); err == nil {
t.Error("fs.ReadDir of nonexistent directory succeeded")
}
// Test that the error message does not contain a backslash,
// and does not contain the DirFS argument.
const nonesuch = "dir/nonesuch"
_, err := fsys.Open(nonesuch)
if err == nil {
t.Error("fs.Open of nonexistent file succeeded")
} else {
if !strings.Contains(err.Error(), nonesuch) {
t.Errorf("error %q does not contain %q", err, nonesuch)
}
if strings.Contains(err.(*PathError).Path, "testdata") {
t.Errorf("error %q contains %q", err, "testdata")
}
}
// Test that Open does not accept backslash as separator.
d := DirFS(".")
_, err = d.Open(`testdata\dirfs`)
if err == nil {
t.Fatalf(`Open testdata\dirfs succeeded`)
}
// Test that Open does not open Windows device files.
_, err = d.Open(`NUL`)
if err == nil {
t.Errorf(`Open NUL succeeded`)
}
}
func TestDirFSRootDir(t *testing.T) {
t.Parallel()
cwd, err := Getwd()
if err != nil {
t.Fatal(err)
}
cwd = cwd[len(filepath.VolumeName(cwd)):] // trim volume prefix (C:) on Windows
cwd = filepath.ToSlash(cwd) // convert \ to /
cwd = strings.TrimPrefix(cwd, "/") // trim leading /
// Test that Open can open a path starting at /.
d := DirFS("/")
f, err := d.Open(cwd + "/testdata/dirfs/a")
if err != nil {
t.Fatal(err)
}
f.Close()
}
func TestDirFSEmptyDir(t *testing.T) {
t.Parallel()
d := DirFS("")
cwd, _ := Getwd()
for _, path := range []string{
"testdata/dirfs/a", // not DirFS(".")
filepath.ToSlash(cwd) + "/testdata/dirfs/a", // not DirFS("/")
} {
_, err := d.Open(path)
if err == nil {
t.Fatalf(`DirFS("").Open(%q) succeeded`, path)
}
}
}
func TestDirFSPathsValid(t *testing.T) {
if runtime.GOOS == "windows" {
t.Skipf("skipping on Windows")
}
t.Parallel()
d := t.TempDir()
if err := WriteFile(filepath.Join(d, "control.txt"), []byte(string("Hello, world!")), 0644); err != nil {
t.Fatal(err)
}
if err := WriteFile(filepath.Join(d, `e:xperi\ment.txt`), []byte(string("Hello, colon and backslash!")), 0644); err != nil {
t.Fatal(err)
}
fsys := DirFS(d)
err := fs.WalkDir(fsys, ".", func(path string, e fs.DirEntry, err error) error {
if fs.ValidPath(e.Name()) {
t.Logf("%q ok", e.Name())
} else {
t.Errorf("%q INVALID", e.Name())
}
return nil
})
if err != nil {
t.Fatal(err)
}
}
func TestReadFileProc(t *testing.T) {
t.Parallel()
// Linux files in /proc report 0 size,
// but then if ReadFile reads just a single byte at offset 0,
// the read at offset 1 returns EOF instead of more data.
// ReadFile has a minimum read size of 512 to work around this,
// but test explicitly that it's working.
name := "/proc/sys/fs/pipe-max-size"
if _, err := Stat(name); err != nil {
t.Skip(err)
}
data, err := ReadFile(name)
if err != nil {
t.Fatal(err)
}
if len(data) == 0 || data[len(data)-1] != '\n' {
t.Fatalf("read %s: not newline-terminated: %q", name, data)
}
}
func TestDirFSReadFileProc(t *testing.T) {
t.Parallel()
fsys := DirFS("/")
name := "proc/sys/fs/pipe-max-size"
if _, err := fs.Stat(fsys, name); err != nil {
t.Skip()
}
data, err := fs.ReadFile(fsys, name)
if err != nil {
t.Fatal(err)
}
if len(data) == 0 || data[len(data)-1] != '\n' {
t.Fatalf("read %s: not newline-terminated: %q", name, data)
}
}
func TestWriteStringAlloc(t *testing.T) {
if runtime.GOOS == "js" {
t.Skip("js allocates a lot during File.WriteString")
}
d := t.TempDir()
f, err := Create(filepath.Join(d, "whiteboard.txt"))
if err != nil {
t.Fatal(err)
}
defer f.Close()
allocs := testing.AllocsPerRun(100, func() {
f.WriteString("I will not allocate when passed a string longer than 32 bytes.\n")
})
if allocs != 0 {
t.Errorf("expected 0 allocs for File.WriteString, got %v", allocs)
}
}
// Test that it's OK to have parallel I/O and Close on a pipe.
func TestPipeIOCloseRace(t *testing.T) {
// Skip on wasm, which doesn't have pipes.
if runtime.GOOS == "js" || runtime.GOOS == "wasip1" {
t.Skipf("skipping on %s: no pipes", runtime.GOOS)
}
t.Parallel()
r, w, err := Pipe()
if err != nil {
t.Fatal(err)
}
var wg sync.WaitGroup
wg.Add(3)
go func() {
defer wg.Done()
for {
n, err := w.Write([]byte("hi"))
if err != nil {
// We look at error strings as the
// expected errors are OS-specific.
switch {
case errors.Is(err, ErrClosed),
strings.Contains(err.Error(), "broken pipe"),
strings.Contains(err.Error(), "pipe is being closed"),
strings.Contains(err.Error(), "hungup channel"):
// Ignore an expected error.
default:
// Unexpected error.
t.Error(err)
}
return
}
if n != 2 {
t.Errorf("wrote %d bytes, expected 2", n)
return
}
}
}()
go func() {
defer wg.Done()
for {
var buf [2]byte
n, err := r.Read(buf[:])
if err != nil {
if err != io.EOF && !errors.Is(err, ErrClosed) {
t.Error(err)
}
return
}
if n != 2 {
t.Errorf("read %d bytes, want 2", n)
}
}
}()
go func() {
defer wg.Done()
// Let the other goroutines start. This is just to get
// a better test, the test will still pass if they
// don't start.
time.Sleep(time.Millisecond)
if err := r.Close(); err != nil {
t.Error(err)
}
if err := w.Close(); err != nil {
t.Error(err)
}
}()
wg.Wait()
}
// Test that it's OK to call Close concurrently on a pipe.
func TestPipeCloseRace(t *testing.T) {
// Skip on wasm, which doesn't have pipes.
if runtime.GOOS == "js" || runtime.GOOS == "wasip1" {
t.Skipf("skipping on %s: no pipes", runtime.GOOS)
}
t.Parallel()
r, w, err := Pipe()
if err != nil {
t.Fatal(err)
}
var wg sync.WaitGroup
c := make(chan error, 4)
f := func() {
defer wg.Done()
c <- r.Close()
c <- w.Close()
}
wg.Add(2)
go f()
go f()
nils, errs := 0, 0
for i := 0; i < 4; i++ {
err := <-c
if err == nil {
nils++
} else {
errs++
}
}
if nils != 2 || errs != 2 {
t.Errorf("got nils %d errs %d, want 2 2", nils, errs)
}
}
func TestRandomLen(t *testing.T) {
for range 5 {
dir, err := MkdirTemp(t.TempDir(), "*")
if err != nil {
t.Fatal(err)
}
base := filepath.Base(dir)
if len(base) > 10 {
t.Errorf("MkdirTemp returned len %d: %s", len(base), base)
}
}
for range 5 {
f, err := CreateTemp(t.TempDir(), "*")
if err != nil {
t.Fatal(err)
}
base := filepath.Base(f.Name())
f.Close()
if len(base) > 10 {
t.Errorf("CreateTemp returned len %d: %s", len(base), base)
}
}
}
func TestCopyFS(t *testing.T) {
t.Parallel()
// Test with disk filesystem.
forceMFTUpdateOnWindows(t, "./testdata/dirfs")
fsys := DirFS("./testdata/dirfs")
tmpDir := t.TempDir()
if err := CopyFS(tmpDir, fsys); err != nil {
t.Fatal("CopyFS:", err)
}
forceMFTUpdateOnWindows(t, tmpDir)
tmpFsys := DirFS(tmpDir)
if err := fstest.TestFS(tmpFsys, "a", "b", "dir/x"); err != nil {
t.Fatal("TestFS:", err)
}
if err := verifyCopyFS(t, fsys, tmpFsys); err != nil {
t.Fatal("comparing two directories:", err)
}
// Test whether CopyFS disallows copying for disk filesystem when there is any
// existing file in the destination directory.
if err := CopyFS(tmpDir, fsys); !errors.Is(err, fs.ErrExist) {
t.Errorf("CopyFS should have failed and returned error when there is"+
"any existing file in the destination directory (in disk filesystem), "+
"got: %v, expected any error that indicates <file exists>", err)
}
// Test with memory filesystem.
fsys = fstest.MapFS{
"william": {Data: []byte("Shakespeare\n")},
"carl": {Data: []byte("Gauss\n")},
"daVinci": {Data: []byte("Leonardo\n")},
"einstein": {Data: []byte("Albert\n")},
"dir/newton": {Data: []byte("Sir Isaac\n")},
}
tmpDir = t.TempDir()
if err := CopyFS(tmpDir, fsys); err != nil {
t.Fatal("CopyFS:", err)
}
forceMFTUpdateOnWindows(t, tmpDir)
tmpFsys = DirFS(tmpDir)
if err := fstest.TestFS(tmpFsys, "william", "carl", "daVinci", "einstein", "dir/newton"); err != nil {
t.Fatal("TestFS:", err)
}
if err := verifyCopyFS(t, fsys, tmpFsys); err != nil {
t.Fatal("comparing two directories:", err)
}
// Test whether CopyFS disallows copying for memory filesystem when there is any
// existing file in the destination directory.
if err := CopyFS(tmpDir, fsys); !errors.Is(err, fs.ErrExist) {
t.Errorf("CopyFS should have failed and returned error when there is"+
"any existing file in the destination directory (in memory filesystem), "+
"got: %v, expected any error that indicates <file exists>", err)
}
}
// verifyCopyFS checks the content and permission of each file inside copied FS to ensure
// the copied files satisfy the convention stipulated in CopyFS.
func verifyCopyFS(t *testing.T, originFS, copiedFS fs.FS) error {
testDir := filepath.Join(t.TempDir(), "test")
// umask doesn't apply to the wasip and windows and there is no general way to get masked perm,
// so create a dir and a file to compare the permission after umask if any
if err := Mkdir(testDir, ModePerm); err != nil {
return fmt.Errorf("mkdir %q failed: %v", testDir, err)
}
dirStat, err := Stat(testDir)
if err != nil {
return fmt.Errorf("stat dir %q failed: %v", testDir, err)
}
wantDirMode := dirStat.Mode()
f, err := Create(filepath.Join(testDir, "tmp"))
if err != nil {
return fmt.Errorf("open %q failed: %v", filepath.Join(testDir, "tmp"), err)
}
defer f.Close()
wantFileRWStat, err := f.Stat()
if err != nil {
return fmt.Errorf("stat file %q failed: %v", f.Name(), err)
}
wantFileRWMode := wantFileRWStat.Mode()
return fs.WalkDir(originFS, ".", func(path string, d fs.DirEntry, err error) error {
if d.IsDir() {
// the dir . is not the dir created by CopyFS so skip checking its permission
if d.Name() == "." {
return nil
}
dinfo, err := fs.Stat(copiedFS, path)
if err != nil {
return err
}
if dinfo.Mode() != wantDirMode {
return fmt.Errorf("dir %q mode is %v, want %v",
d.Name(), dinfo.Mode(), wantDirMode)
}
return nil
}
fInfo, err := originFS.Open(path)
if err != nil {
return err
}
defer fInfo.Close()
copiedInfo, err := copiedFS.Open(path)
if err != nil {
return err
}
defer copiedInfo.Close()
// verify the file contents are the same
data, err := io.ReadAll(fInfo)
if err != nil {
return err
}
newData, err := io.ReadAll(copiedInfo)
if err != nil {
return err
}
if !bytes.Equal(data, newData) {
return fmt.Errorf("file %q content is %s, want %s", path, newData, data)
}
fStat, err := fInfo.Stat()
if err != nil {
return err
}
copiedStat, err := copiedInfo.Stat()
if err != nil {
return err
}
// check whether the execute permission is inherited from original FS
if copiedStat.Mode()&0111&wantFileRWMode != fStat.Mode()&0111&wantFileRWMode {
return fmt.Errorf("file %q execute mode is %v, want %v",
path, copiedStat.Mode()&0111, fStat.Mode()&0111)
}
rwMode := copiedStat.Mode() &^ 0111 // unset the executable permission from file mode
if rwMode != wantFileRWMode {
return fmt.Errorf("file %q rw mode is %v, want %v",
path, rwMode, wantFileRWStat.Mode())
}
return nil
})
}
func TestCopyFSWithSymlinks(t *testing.T) {
// Test it with absolute and relative symlinks that point inside and outside the tree.
testenv.MustHaveSymlink(t)
// Create a directory and file outside.
tmpDir := t.TempDir()
outsideDir := filepath.Join(tmpDir, "copyfs_out")
if err := Mkdir(outsideDir, 0755); err != nil {
t.Fatalf("Mkdir: %v", err)
}
outsideFile := filepath.Join(outsideDir, "file.out.txt")
if err := WriteFile(outsideFile, []byte("Testing CopyFS outside"), 0644); err != nil {
t.Fatalf("WriteFile: %v", err)
}
// Create a directory and file inside.
insideDir := filepath.Join(tmpDir, "copyfs_in")
if err := Mkdir(insideDir, 0755); err != nil {
t.Fatalf("Mkdir: %v", err)
}
insideFile := filepath.Join(insideDir, "file.in.txt")
if err := WriteFile(insideFile, []byte("Testing CopyFS inside"), 0644); err != nil {
t.Fatalf("WriteFile: %v", err)
}
// Create directories for symlinks.
linkInDir := filepath.Join(insideDir, "in_symlinks")
if err := Mkdir(linkInDir, 0755); err != nil {
t.Fatalf("Mkdir: %v", err)
}
linkOutDir := filepath.Join(insideDir, "out_symlinks")
if err := Mkdir(linkOutDir, 0755); err != nil {
t.Fatalf("Mkdir: %v", err)
}
// First, we create the absolute symlink pointing outside.
outLinkFile := filepath.Join(linkOutDir, "file.abs.out.link")
if err := Symlink(outsideFile, outLinkFile); err != nil {
t.Fatalf("Symlink: %v", err)
}
// Then, we create the relative symlink pointing outside.
relOutsideFile, err := filepath.Rel(filepath.Join(linkOutDir, "."), outsideFile)
if err != nil {
t.Fatalf("filepath.Rel: %v", err)
}
relOutLinkFile := filepath.Join(linkOutDir, "file.rel.out.link")
if err := Symlink(relOutsideFile, relOutLinkFile); err != nil {
t.Fatalf("Symlink: %v", err)
}
// Last, we create the relative symlink pointing inside.
relInsideFile, err := filepath.Rel(filepath.Join(linkInDir, "."), insideFile)
if err != nil {
t.Fatalf("filepath.Rel: %v", err)
}
relInLinkFile := filepath.Join(linkInDir, "file.rel.in.link")
if err := Symlink(relInsideFile, relInLinkFile); err != nil {
t.Fatalf("Symlink: %v", err)
}
// Copy the directory tree and verify.
forceMFTUpdateOnWindows(t, insideDir)
fsys := DirFS(insideDir)
tmpDupDir := filepath.Join(tmpDir, "copyfs_dup")
if err := Mkdir(tmpDupDir, 0755); err != nil {
t.Fatalf("Mkdir: %v", err)
}
// TODO(panjf2000): symlinks are currently not supported, and a specific error
// will be returned. Verify that error and skip the subsequent test,
// revisit this once #49580 is closed.
if err := CopyFS(tmpDupDir, fsys); !errors.Is(err, ErrInvalid) {
t.Fatalf("got %v, want ErrInvalid", err)
}
t.Skip("skip the subsequent test and wait for #49580")
forceMFTUpdateOnWindows(t, tmpDupDir)
tmpFsys := DirFS(tmpDupDir)
if err := fstest.TestFS(tmpFsys, "file.in.txt", "out_symlinks/file.abs.out.link", "out_symlinks/file.rel.out.link", "in_symlinks/file.rel.in.link"); err != nil {
t.Fatal("TestFS:", err)
}
if err := fs.WalkDir(fsys, ".", func(path string, d fs.DirEntry, err error) error {
if d.IsDir() {
return nil
}
fi, err := d.Info()
if err != nil {
return err
}
if filepath.Ext(path) == ".link" {
if fi.Mode()&ModeSymlink == 0 {
return errors.New("original file " + path + " should be a symlink")
}
tmpfi, err := fs.Stat(tmpFsys, path)
if err != nil {
return err
}
if tmpfi.Mode()&ModeSymlink != 0 {
return errors.New("copied file " + path + " should not be a symlink")
}
}
data, err := fs.ReadFile(fsys, path)
if err != nil {
return err
}
newData, err := fs.ReadFile(tmpFsys, path)
if err != nil {
return err
}
if !bytes.Equal(data, newData) {
return errors.New("file " + path + " contents differ")
}
var target string
switch fileName := filepath.Base(path); fileName {
case "file.abs.out.link", "file.rel.out.link":
target = outsideFile
case "file.rel.in.link":
target = insideFile
}
if len(target) > 0 {
targetData, err := ReadFile(target)
if err != nil {
return err
}
if !bytes.Equal(targetData, newData) {
return errors.New("file " + path + " contents differ from target")
}
}
return nil
}); err != nil {
t.Fatal("comparing two directories:", err)
}
}
func TestAppendDoesntOverwrite(t *testing.T) {
name := filepath.Join(t.TempDir(), "file")
if err := WriteFile(name, []byte("hello"), 0666); err != nil {
t.Fatal(err)
}
f, err := OpenFile(name, O_APPEND|O_WRONLY, 0)
if err != nil {
t.Fatal(err)
}
if _, err := f.Write([]byte(" world")); err != nil {
f.Close()
t.Fatal(err)
}
if err := f.Close(); err != nil {
t.Fatal(err)
}
got, err := ReadFile(name)
if err != nil {
t.Fatal(err)
}
want := "hello world"
if string(got) != want {
t.Fatalf("got %q, want %q", got, want)
}
}