Golang程序
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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/ioutil"
. "os"
osexec "os/exec"
"path/filepath"
"reflect"
"runtime"
"runtime/debug"
"sort"
"strings"
"sync"
"syscall"
"testing"
"time"
)
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 "darwin":
switch runtime.GOARCH {
case "arm", "arm64":
wd, err := syscall.Getwd()
if err != nil {
wd = err.Error()
}
return &sysDir{
filepath.Join(wd, "..", ".."),
[]string{
"ResourceRules.plist",
"Info.plist",
},
}
}
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 file.Close()
var buf [100]byte
len := 0
for {
n, e := file.Read(buf[0:])
len += n
if e == io.EOF {
break
}
if e != nil {
t.Fatal("read failed:", e)
}
}
return int64(len)
}
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", "windows":
return TempDir()
case "darwin":
switch runtime.GOARCH {
case "arm", "arm64":
return TempDir()
}
}
return "/tmp"
}
func newFile(testName string, t *testing.T) (f *File) {
f, err := ioutil.TempFile(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 := ioutil.TempDir(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"
Remove(path) // Just in case
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"
Remove(link) // Just in case
err = Symlink(path, link)
if err != nil {
t.Fatal(err)
}
defer Remove(link)
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 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 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 %s in directory", n)
}
if equal(m, n) {
if found {
t.Error("present twice:", m)
}
found = true
}
}
if !found {
t.Error("could not find", m)
}
}
}
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 equal(m, n.Name()) {
if found {
t.Error("present twice:", m)
}
found = true
}
}
if !found {
t.Error("could not find", m)
}
}
}
func TestReaddirnames(t *testing.T) {
testReaddirnames(".", dot, t)
testReaddirnames(sysdir.name, sysdir.files, t)
}
func TestReaddir(t *testing.T) {
testReaddir(".", dot, t)
testReaddir(sysdir.name, sysdir.files, 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 BenchmarkReaddirname(b *testing.B) {
benchmarkReaddirname(".", 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 "darwin":
switch runtime.GOARCH {
case "arm", "arm64":
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, err := ioutil.TempDir("", "")
if err != nil {
t.Fatalf("TempDir: %v", err)
}
defer RemoveAll(dir)
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) {
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)
}
}
readDirNamesExpect := func(n, want int, wantErr error) {
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} {
// 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, err := ioutil.TempDir("", "")
if err != nil {
t.Fatalf("TempDir: %v", err)
}
defer RemoveAll(dir)
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 := ioutil.TempFile("", "_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")
}
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"
Remove(from) // Just in case.
file, err := Create(to)
if err != nil {
t.Fatalf("open %q failed: %v", to, err)
}
defer Remove(to)
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)
}
defer Remove(from)
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. Used when PWD is read-only.
func chtmpdir(t *testing.T) func() {
if runtime.GOOS != "darwin" || (runtime.GOARCH != "arm" && runtime.GOARCH != "arm64") {
return func() {} // only needed on darwin/arm{,64}
}
oldwd, err := Getwd()
if err != nil {
t.Fatalf("chtmpdir: %v", err)
}
d, err := ioutil.TempDir("", "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"
Remove(from) // Just in case.
file, err := Create(to)
if err != nil {
t.Fatalf("Create(%q) failed: %v", to, err)
}
defer Remove(to)
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)
}
defer Remove(from)
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"
Remove(from) // Just in case.
err := Symlink(s, from)
if err != nil {
t.Fatalf("symlink %q, %q failed: %v", s, from, err)
}
defer Remove(from)
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"
// Ensure we are not testing the overwrite case here.
Remove(from)
Remove(to)
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)
}
defer Remove(to)
_, err = Stat(to)
if err != nil {
t.Errorf("stat %q failed: %v", to, err)
}
}
func TestRenameOverwriteDest(t *testing.T) {
defer chtmpdir(t)()
from, to := "renamefrom", "renameto"
// Just in case.
Remove(from)
Remove(to)
toData := []byte("to")
fromData := []byte("from")
err := ioutil.WriteFile(to, toData, 0777)
if err != nil {
t.Fatalf("write file %q failed: %v", to, err)
}
err = ioutil.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)
}
defer Remove(to)
_, 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) {
defer chtmpdir(t)()
from, to := "renamefrom", "renameto"
// Ensure we are not testing the overwrite case here.
Remove(from)
Remove(to)
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)
// cleanup whatever was placed in "renameto"
Remove(to)
default:
t.Errorf("rename %q, %q: expected %T, got %T %v", from, to, new(LinkError), err, err)
}
}
func TestRenameNotExisting(t *testing.T) {
defer chtmpdir(t)()
from, to := "doesnt-exist", "dest"
Mkdir(to, 0777)
defer Remove(to)
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) {
defer chtmpdir(t)()
from, to := "renamefrom", "renameto"
Remove(from)
Remove(to)
Mkdir(from, 0777)
Mkdir(to, 0777)
defer Remove(from)
defer Remove(to)
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)
// cleanup whatever was placed in "renameto"
Remove(to)
default:
t.Errorf("rename %q, %q: expected %T, got %T %v", from, to, new(LinkError), err, err)
}
}
func exec(t *testing.T, dir, cmd string, args []string, expect string) {
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 bytes.Buffer
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)
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 = osexec.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...)
// Test absolute executable path.
exec(t, dir, cmd, args, dir)
// Test relative executable path.
exec(t, 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()&0777 != mode {
t.Errorf("Stat %q: mode %#o want %#o", path, dir.Mode(), mode)
}
}
func TestChmod(t *testing.T) {
// Chmod is not supported under windows.
if runtime.GOOS == "windows" {
return
}
f := newFile("TestChmod", t)
defer Remove(f.Name())
defer f.Close()
if err := Chmod(f.Name(), 0456); err != nil {
t.Fatalf("chmod %s 0456: %s", f.Name(), err)
}
checkMode(t, f.Name(), 0456)
if err := f.Chmod(0123); err != nil {
t.Fatalf("chmod %s 0123: %s", f.Name(), err)
}
checkMode(t, f.Name(), 0123)
}
func checkSize(t *testing.T, f *File, size int64) {
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) {
f := newFile("TestFTruncate", t)
defer Remove(f.Name())
defer f.Close()
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) {
f := newFile("TestTruncate", t)
defer Remove(f.Name())
defer f.Close()
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.
}
}
// Use TempDir (via newFile) to make sure we're on a local file system,
// so that timings are not distorted by latency and caching.
// On NFS, timings can be off due to caching of meta-data on
// NFS servers (Issue 848).
func TestChtimes(t *testing.T) {
f := newFile("TestChtimes", t)
defer Remove(f.Name())
f.Write([]byte("hello, world\n"))
f.Close()
testChtimes(t, f.Name())
}
// Use TempDir (via newDir) to make sure we're on a local file system,
// so that timings are not distorted by latency and caching.
// On NFS, timings can be off due to caching of meta-data on
// NFS servers (Issue 848).
func TestChtimesDir(t *testing.T) {
name := newDir("TestChtimes", t)
defer RemoveAll(name)
testChtimes(t, name)
}
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) {
switch runtime.GOOS {
case "plan9", "nacl":
// Ignore.
// Plan 9, NaCl:
// 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":
mounts, _ := ioutil.ReadFile("/proc/mounts")
if strings.Contains(string(mounts), "noatime") {
t.Logf("AccessTime didn't go backwards, but see a filesystem mounted noatime; ignoring. Issue 19293.")
} else {
t.Logf("AccessTime didn't go backwards; was=%v, after=%v (Ignoring on NetBSD, assuming noatime, Issue 19293)", at, pat)
}
default:
t.Errorf("AccessTime didn't go backwards; was=%v, after=%v", at, pat)
}
}
if !pmt.Before(mt) {
t.Errorf("ModTime didn't go backwards; was=%v, after=%v", mt, pmt)
}
}
func TestChdirAndGetwd(t *testing.T) {
// TODO(brainman): file.Chdir() is not implemented on windows.
if runtime.GOOS == "windows" {
return
}
fd, err := Open(".")
if err != nil {
t.Fatalf("Open .: %s", err)
}
// 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 "darwin":
switch runtime.GOARCH {
case "arm", "arm64":
d1, err := ioutil.TempDir("", "d1")
if err != nil {
t.Fatalf("TempDir: %v", err)
}
d2, err := ioutil.TempDir("", "d2")
if err != nil {
t.Fatalf("TempDir: %v", err)
}
dirs = []string{d1, d2}
}
}
oldwd := Getenv("PWD")
for mode := 0; mode < 2; mode++ {
for _, d := range dirs {
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()
Setenv("PWD", oldwd)
err2 := fd.Chdir()
if err2 != nil {
// We changed the current directory and cannot go back.
// Don't let the tests continue; they'll scribble
// all over some other directory.
fmt.Fprintf(Stderr, "fchdir back to dot failed: %s\n", err2)
Exit(1)
}
if err != nil {
fd.Close()
t.Fatalf("Chdir %s: %s", d, err)
}
if err1 != nil {
fd.Close()
t.Fatalf("Getwd in %s: %s", d, err1)
}
if pwd != d {
fd.Close()
t.Fatalf("Getwd returned %q want %q", pwd, d)
}
}
}
fd.Close()
}
// Test that Chdir+Getwd is program-wide.
func TestProgWideChdir(t *testing.T) {
const N = 10
c := make(chan bool)
cpwd := make(chan string)
for i := 0; i < N; i++ {
go func(i int) {
// 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()
}
<-c
pwd, err := Getwd()
if err != nil {
t.Errorf("Getwd on goroutine %d: %v", i, err)
return
}
cpwd <- pwd
}(i)
}
oldwd, err := Getwd()
if err != nil {
t.Fatalf("Getwd: %v", err)
}
d, err := ioutil.TempDir("", "test")
if err != nil {
t.Fatalf("TempDir: %v", err)
}
defer func() {
if err := Chdir(oldwd); err != nil {
t.Fatalf("Chdir: %v", err)
}
RemoveAll(d)
}()
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(c)
for i := 0; i < N; i++ {
pwd := <-cpwd
if pwd != d {
t.Errorf("Getwd returned %q; want %q", pwd, d)
}
}
}
func TestSeek(t *testing.T) {
f := newFile("TestSeek", t)
defer Remove(f.Name())
defer f.Close()
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 {
if runtime.GOOS == "nacl" && tt.out > 1<<30 {
t.Logf("skipping test case #%d on nacl; https://golang.org/issue/21728", i)
continue
}
off, err := f.Seek(tt.in, tt.whence)
if off != tt.out || err != nil {
if e, ok := err.(*PathError); ok && e.Err == syscall.EINVAL && tt.out > 1<<32 && runtime.GOOS == "linux" {
mounts, _ := ioutil.ReadFile("/proc/mounts")
if strings.Contains(string(mounts), "reiserfs") {
// Reiserfs rejects the big seeks.
t.Skipf("skipping test known to fail on reiserfs; https://golang.org/issue/91")
}
}
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 "plan9", "nacl":
t.Skipf("skipping test on %v", runtime.GOOS)
}
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)
}
}
type openErrorTest struct {
path string
mode int
error error
}
var openErrorTests = []openErrorTest{
{
sfdir + "/no-such-file",
O_RDONLY,
syscall.ENOENT,
},
{
sfdir,
O_WRONLY,
syscall.EISDIR,
},
{
sfdir + "/" + sfname + "/no-such-file",
O_WRONLY,
syscall.ENOTDIR,
},
}
func TestOpenError(t *testing.T) {
for _, tt := range openErrorTests {
f, err := OpenFile(tt.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 {
t.Fatal(`Open("") succeeded`)
f.Close()
}
}
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()
const path = "/bin/hostname"
p, err := StartProcess(path, []string{"hostname"}, &ProcAttr{Files: []*File{nil, w, Stderr}})
if err != nil {
if _, err := Stat(path); IsNotExist(err) {
t.Skipf("skipping test; test requires %s but it does not exist", path)
}
t.Fatal(err)
}
w.Close()
var b bytes.Buffer
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, err := Hostname()
if err != nil {
t.Fatal(err)
}
cmd := osexec.Command("hostname")
out, err := cmd.CombinedOutput()
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, want %q", hostname, want)
}
}
func TestHostname(t *testing.T) {
// 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":
t.Skipf("%s doesn't have /bin/hostname", runtime.GOOS)
case "windows":
testWindowsHostname(t)
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
hostname, err := Hostname()
if err != nil {
t.Fatalf("%v", err)
}
want := runBinHostname(t)
if hostname != want {
i := strings.Index(hostname, ".")
if i < 0 || hostname[0:i] != want {
t.Errorf("Hostname() = %q, want %q", hostname, want)
}
}
}
func TestReadAt(t *testing.T) {
f := newFile("TestReadAt", t)
defer Remove(f.Name())
defer f.Close()
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) {
f := newFile("TestReadAtOffset", t)
defer Remove(f.Name())
defer f.Close()
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) {
f := newFile("TestReadAtNegativeOffset", t)
defer Remove(f.Name())
defer f.Close()
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) {
f := newFile("TestWriteAt", t)
defer Remove(f.Name())
defer f.Close()
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 := ioutil.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) {
f := newFile("TestWriteAtNegativeOffset", t)
defer Remove(f.Name())
defer f.Close()
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)
}
}
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 := ioutil.ReadFile(fname)
if err != nil {
t.Fatalf("ReadFile: %v", err)
}
return string(data)
}
func TestAppend(t *testing.T) {
defer chtmpdir(t)()
const f = "append.txt"
defer Remove(f)
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) {
// Create new temporary directory and arrange to clean it up.
path, err := ioutil.TempDir("", "/_TestStatDirWithSlash_")
if err != nil {
t.Fatalf("TempDir: %s", err)
}
defer RemoveAll(path)
// Stat of path should succeed.
_, err = Stat(path)
if err != nil {
t.Fatalf("stat %s failed: %s", path, err)
}
// Stat of path+"/" should succeed too.
path += "/"
_, err = Stat(path)
if 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) {
defer chtmpdir(t)()
fa, err := Create("a")
if err != nil {
t.Fatalf("Create(a): %v", err)
}
defer Remove(fa.Name())
fa.Close()
fb, err := Create("b")
if err != nil {
t.Fatalf("Create(b): %v", err)
}
defer Remove(fb.Name())
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 TestDevNullFile(t *testing.T) {
f, err := Open(DevNull)
if err != nil {
t.Fatalf("Open(%s): %v", DevNull, err)
}
defer f.Close()
fi, err := f.Stat()
if err != nil {
t.Fatalf("Stat(%s): %v", DevNull, err)
}
name := filepath.Base(DevNull)
if fi.Name() != name {
t.Fatalf("wrong file name have %v want %v", fi.Name(), name)
}
if fi.Size() != 0 {
t.Fatalf("wrong file size have %d want 0", fi.Size())
}
}
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) {
const mode = 0111
path, err := ioutil.TempDir("", "go-build")
if err != nil {
t.Fatalf("Failed to create temp directory: %v", err)
}
defer RemoveAll(path)
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)
}
testenv.MustHaveExec(t)
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)
}
fi, err := Stdin.Stat()
if err != nil {
t.Fatal(err)
}
switch mode := fi.Mode(); {
case mode&ModeCharDevice != 0:
case mode&ModeNamedPipe != 0:
default:
t.Fatalf("unexpected Stdin mode (%v), want ModeCharDevice or ModeNamedPipe", mode)
}
var cmd *osexec.Cmd
if runtime.GOOS == "windows" {
cmd = osexec.Command("cmd", "/c", "echo output | "+Args[0]+" -test.run=TestStatStdin")
} else {
cmd = osexec.Command("/bin/sh", "-c", "echo output | "+Args[0]+" -test.run=TestStatStdin")
}
cmd.Env = append(Environ(), "GO_WANT_HELPER_PROCESS=1")
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)
tmpdir, err := ioutil.TempDir("", "TestStatRelativeSymlink")
if err != nil {
t.Fatal(err)
}
defer RemoveAll(tmpdir)
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) {
f := newFile("TestReadAtEOF", t)
defer Remove(f.Name())
defer f.Close()
_, 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) {
tmpdir := newDir("TestLongPath", t)
defer func(d string) {
if err := RemoveAll(d); err != nil {
t.Fatalf("RemoveAll failed: %v", err)
}
}(tmpdir)
// 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 := ioutil.WriteFile(sizedTempDir+"/foo.txt", data, 0644); err != nil {
t.Fatalf("ioutil.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)
}
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)) {
testenv.MustHaveExec(t)
// Re-exec the test binary itself to emulate "sleep 1".
cmd := osexec.Command(Args[0], "-test.run", "TestSleep")
err := cmd.Start()
if err != nil {
t.Fatalf("Failed to start test process: %v", err)
}
go func() {
time.Sleep(100 * time.Millisecond)
processKiller(cmd.Process)
}()
err = cmd.Wait()
if err == nil {
t.Errorf("Test process succeeded, but expected to fail")
}
}
// TestSleep emulates "sleep 1". It is a helper for testKillProcess, so we
// don't have to rely on an external "sleep" command being available.
func TestSleep(t *testing.T) {
if testing.Short() {
t.Skip("Skipping in short mode")
}
time.Sleep(time.Second)
}
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")
}
testenv.MustHaveExec(t)
if Getenv("GO_WANT_HELPER_PROCESS") == "1" {
fmt.Print(Getppid())
Exit(0)
}
cmd := osexec.Command(Args[0], "-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) {
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")
}
n := runtime.GOMAXPROCS(16)
defer runtime.GOMAXPROCS(n)
root, err := ioutil.TempDir("", "issue")
if err != nil {
t.Fatal(err)
}
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 "freebsd":
t.Skip("skipping on FreeBSD; issue 19093")
case "solaris":
t.Skip("skipping on Solaris; issue 19111")
case "windows":
t.Skip("skipping on Windows; issue 19098")
case "plan9":
t.Skip("skipping on Plan 9; does not support runtime poller")
}
threads := 100
// OpenBSD has a low default for max number of files.
if runtime.GOOS == "openbsd" {
threads = 50
}
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(t *testing.T) {
path := sfdir + "/" + sfname
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 returned unexpected error type %T; expected os.PathError", pe)
} else if pe.Err != ErrClosed {
t.Errorf("second Close returned %q, wanted %q", err, ErrClosed)
} else {
t.Logf("second close returned expected error %q", err)
}
}