blob: 8eabdee6b61b019c93f25eb43a855f02f3b5fd57 [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"
"fmt"
"io"
"io/ioutil"
. "os"
"path/filepath"
"strings"
"syscall"
"testing"
)
var dot = []string{
"dir_unix.go",
"env_unix.go",
"error.go",
"file.go",
"os_test.go",
"time.go",
"types.go",
"stat_darwin.go",
"stat_linux.go",
}
type sysDir struct {
name string
files []string
}
var sysdir = func() (sd *sysDir) {
switch syscall.OS {
case "windows":
sd = &sysDir{
Getenv("SystemRoot") + "\\system32\\drivers\\etc",
[]string{
"hosts",
"networks",
"protocol",
"services",
},
}
case "plan9":
sd = &sysDir{
"/lib/ndb",
[]string{
"common",
"local",
},
}
default:
sd = &sysDir{
"/etc",
[]string{
"group",
"hosts",
"passwd",
},
}
}
return
}()
func size(name string, t *testing.T) int64 {
file, err := Open(name)
defer file.Close()
if err != nil {
t.Fatal("open failed:", err)
}
var buf [100]byte
len := 0
for {
n, e := file.Read(buf[0:])
len += n
if e == EOF {
break
}
if e != nil {
t.Fatal("read failed:", err)
}
}
return int64(len)
}
func equal(name1, name2 string) (r bool) {
switch syscall.OS {
case "windows":
r = strings.ToLower(name1) == strings.ToLower(name2)
default:
r = name1 == name2
}
return
}
func newFile(testName string, t *testing.T) (f *File) {
// Use a local file system, not NFS.
// On Unix, override $TMPDIR in case the user
// has it set to an NFS-mounted directory.
dir := ""
if syscall.OS != "windows" {
dir = "/tmp"
}
f, err := ioutil.TempFile(dir, "_Go_"+testName)
if err != nil {
t.Fatalf("open %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 TestFstat(t *testing.T) {
path := sfdir + "/" + sfname
file, err1 := Open(path)
defer file.Close()
if err1 != nil {
t.Fatal("open failed:", err1)
}
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)
}
}
func testReaddirnames(dir string, contents []string, t *testing.T) {
file, err := Open(dir)
defer file.Close()
if err != nil {
t.Fatalf("open %q failed: %v", dir, err)
}
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)
defer file.Close()
if err != nil {
t.Fatalf("open %q failed: %v", dir, err)
}
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)
}
// 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 == 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 syscall.OS {
case "windows":
dir = Getenv("SystemRoot") + "\\system32"
case "plan9":
dir = "/bin"
}
file, err := Open(dir)
defer file.Close()
if err != nil {
t.Fatalf("open %q failed: %v", dir, err)
}
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)
}
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.Logf("test.short; skipping")
return
}
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, EOF)
d.Close()
}
}
func TestHardLink(t *testing.T) {
// Hardlinks are not supported under windows.
if syscall.OS == "windows" {
return
}
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)
}
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 tostat.Dev != fromstat.Dev || tostat.Ino != fromstat.Ino {
t.Errorf("link %q, %q did not create hard link", to, from)
}
}
func TestSymLink(t *testing.T) {
// Symlinks are not supported under windows.
if syscall.OS == "windows" {
return
}
from, to := "symlinktestfrom", "symlinktestto"
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 = Symlink(to, from)
if err != nil {
t.Fatalf("symlink %q, %q failed: %v", to, from, err)
}
defer Remove(from)
tostat, err := Stat(to)
if err != nil {
t.Fatalf("stat %q failed: %v", to, err)
}
if tostat.FollowedSymlink {
t.Fatalf("stat %q claims to have followed a symlink", to)
}
fromstat, err := Stat(from)
if err != nil {
t.Fatalf("stat %q failed: %v", from, err)
}
if tostat.Dev != fromstat.Dev || tostat.Ino != fromstat.Ino {
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.IsSymlink() {
t.Fatalf("symlink %q, %q did not create symlink", to, from)
}
fromstat, err = Stat(from)
if err != nil {
t.Fatalf("stat %q failed: %v", from, err)
}
if !fromstat.FollowedSymlink {
t.Fatalf("stat %q did not follow symlink", from)
}
s, err := Readlink(from)
if err != nil {
t.Fatalf("readlink %q failed: %v", from, err)
}
if s != to {
t.Fatalf("after symlink %q != %q", s, to)
}
file, err = Open(from)
if err != nil {
t.Fatalf("open %q failed: %v", from, err)
}
file.Close()
}
func TestLongSymlink(t *testing.T) {
// Symlinks are not supported under windows.
if syscall.OS == "windows" {
return
}
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) {
from, to := "renamefrom", "renameto"
Remove(to) // Just in case.
file, err := Create(from)
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 = 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 exec(t *testing.T, dir, cmd string, args []string, expect string) {
r, w, err := Pipe()
if err != nil {
t.Fatalf("Pipe: %v", err)
}
attr := &ProcAttr{Dir: dir, Files: []*File{nil, w, Stderr}}
p, err := StartProcess(cmd, args, attr)
if err != nil {
t.Fatalf("StartProcess: %v", err)
}
defer p.Release()
w.Close()
var b bytes.Buffer
io.Copy(&b, r)
output := b.String()
// Accept /usr prefix because Solaris /bin is symlinked to /usr/bin.
if output != expect && output != "/usr"+expect {
t.Errorf("exec %q returned %q wanted %q",
strings.Join(append([]string{cmd}, args...), " "), output, expect)
}
p.Wait(0)
}
func TestStartProcess(t *testing.T) {
var dir, cmd, le string
var args []string
if syscall.OS == "windows" {
le = "\r\n"
cmd = Getenv("COMSPEC")
dir = Getenv("SystemRoot")
args = []string{"/c", "cd"}
} else {
le = "\n"
cmd = "/bin/pwd"
dir = "/"
args = []string{}
}
cmddir, cmdbase := filepath.Split(cmd)
args = append([]string{cmdbase}, args...)
// Test absolute executable path.
exec(t, dir, cmd, args, dir+le)
// Test relative executable path.
exec(t, cmddir, cmdbase, args, filepath.Clean(cmddir)+le)
}
func checkMode(t *testing.T, path string, mode uint32) {
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 syscall.OS == "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 checkUidGid(t *testing.T, path string, uid, gid int) {
dir, err := Stat(path)
if err != nil {
t.Fatalf("Stat %q (looking for uid/gid %d/%d): %s", path, uid, gid, err)
}
if dir.Uid != uid {
t.Errorf("Stat %q: uid %d want %d", path, dir.Uid, uid)
}
if dir.Gid != gid {
t.Errorf("Stat %q: gid %d want %d", path, dir.Gid, gid)
}
}
func TestChown(t *testing.T) {
// Chown is not supported under windows.
if syscall.OS == "windows" {
return
}
// Use TempDir() to make sure we're on a local file system,
// so that the group ids returned by Getgroups will be allowed
// on the file. On NFS, the Getgroups groups are
// basically useless.
f := newFile("TestChown", t)
defer Remove(f.Name())
defer f.Close()
dir, err := f.Stat()
if err != nil {
t.Fatalf("stat %s: %s", f.Name(), err)
}
// Can't change uid unless root, but can try
// changing the group id. First try our current group.
gid := Getgid()
t.Log("gid:", gid)
if err = Chown(f.Name(), -1, gid); err != nil {
t.Fatalf("chown %s -1 %d: %s", f.Name(), gid, err)
}
checkUidGid(t, f.Name(), dir.Uid, gid)
// Then try all the auxiliary groups.
groups, err := Getgroups()
if err != nil {
t.Fatalf("getgroups: %s", err)
}
t.Log("groups: ", groups)
for _, g := range groups {
if err = Chown(f.Name(), -1, g); err != nil {
t.Fatalf("chown %s -1 %d: %s", f.Name(), g, err)
}
checkUidGid(t, f.Name(), dir.Uid, g)
// change back to gid to test fd.Chown
if err = f.Chown(-1, gid); err != nil {
t.Fatalf("fchown %s -1 %d: %s", f.Name(), gid, err)
}
checkUidGid(t, f.Name(), dir.Uid, gid)
}
}
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)
f.Write([]byte("surprise!"))
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)
f.Write([]byte("surprise!"))
checkSize(t, f, 13+9) // wrote at offset past where hello, world was.
}
// Use TempDir() 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())
defer f.Close()
f.Write([]byte("hello, world\n"))
f.Close()
preStat, err := Stat(f.Name())
if err != nil {
t.Fatalf("Stat %s: %s", f.Name(), err)
}
// Move access and modification time back a second
const OneSecond = 1e9 // in nanoseconds
err = Chtimes(f.Name(), preStat.Atime_ns-OneSecond, preStat.Mtime_ns-OneSecond)
if err != nil {
t.Fatalf("Chtimes %s: %s", f.Name(), err)
}
postStat, err := Stat(f.Name())
if err != nil {
t.Fatalf("second Stat %s: %s", f.Name(), err)
}
if postStat.Atime_ns >= preStat.Atime_ns {
t.Errorf("Atime_ns didn't go backwards; was=%d, after=%d",
preStat.Atime_ns,
postStat.Atime_ns)
}
if postStat.Mtime_ns >= preStat.Mtime_ns {
t.Errorf("Mtime_ns didn't go backwards; was=%d, after=%d",
preStat.Mtime_ns,
postStat.Mtime_ns)
}
}
func TestChdirAndGetwd(t *testing.T) {
// TODO(brainman): file.Chdir() is not implemented on windows.
if syscall.OS == "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, and /tmp).
dirs := []string{"/", "/usr/bin"}
for mode := 0; mode < 2; mode++ {
for _, d := range dirs {
if mode == 0 {
err = Chdir(d)
} else {
fd1, err := Open(d)
if err != nil {
t.Errorf("Open %s: %s", d, err)
continue
}
err = fd1.Chdir()
fd1.Close()
}
pwd, err1 := Getwd()
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()
}
func TestTime(t *testing.T) {
// Just want to check that Time() is getting something.
// A common failure mode on Darwin is to get 0, 0,
// because it returns the time in registers instead of
// filling in the structure passed to the system call.
// Too bad the compiler doesn't know that
// 365.24*86400 is an integer.
sec, nsec, err := Time()
if sec < (2009-1970)*36524*864 {
t.Errorf("Time() = %d, %d, %s; not plausible", sec, nsec, err)
}
}
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, 1, int64(len(data))},
{0, 0, 0},
{5, 0, 5},
{0, 2, int64(len(data))},
{0, 0, 0},
{-1, 2, int64(len(data)) - 1},
{1 << 33, 0, 1 << 33},
{1 << 33, 2, 1<<33 + int64(len(data))},
}
for i, tt := range tests {
off, err := f.Seek(tt.in, tt.whence)
if off != tt.out || err != nil {
if e, ok := err.(*PathError); ok && e.Error == EINVAL && tt.out > 1<<32 {
// Reiserfs rejects the big seeks.
// http://code.google.com/p/go/issues/detail?id=91
break
}
t.Errorf("#%d: Seek(%v, %v) = %v, %v want %v, nil", i, tt.in, tt.whence, off, err, tt.out)
}
}
}
type openErrorTest struct {
path string
mode int
error Error
}
var openErrorTests = []openErrorTest{
{
sfdir + "/no-such-file",
O_RDONLY,
ENOENT,
},
{
sfdir,
O_WRONLY,
EISDIR,
},
{
sfdir + "/" + sfname + "/no-such-file",
O_WRONLY,
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 *os.PathError", tt.path, tt.mode, err)
}
if perr.Error != tt.error {
t.Errorf("Open(%q, %d) = _, %q; want %q", tt.path, tt.mode, perr.Error.String(), tt.error.String())
}
}
}
func run(t *testing.T, cmd []string) string {
// Run /bin/hostname and collect output.
r, w, err := Pipe()
if err != nil {
t.Fatal(err)
}
p, err := StartProcess("/bin/hostname", []string{"hostname"}, &ProcAttr{Files: []*File{nil, w, Stderr}})
if err != nil {
t.Fatal(err)
}
defer p.Release()
w.Close()
var b bytes.Buffer
io.Copy(&b, r)
p.Wait(0)
output := b.String()
if n := len(output); n > 0 && output[n-1] == '\n' {
output = output[0 : n-1]
}
if output == "" {
t.Fatalf("%v produced no output", cmd)
}
return output
}
func TestHostname(t *testing.T) {
// There is no other way to fetch hostname on windows, but via winapi.
if syscall.OS == "windows" {
return
}
// 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 := run(t, []string{"/bin/hostname"})
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, %r", n, err)
}
if string(b) != "world" {
t.Fatalf("ReadAt 7: have %q want %q", string(b), "world")
}
}
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")
}
}
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) {
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 dir, in _test so it will get
// cleaned up by make if not by us.
path := "_test/_TestStatDirWithSlash_"
err := MkdirAll(path, 0777)
if err != nil {
t.Fatalf("MkdirAll %q: %s", path, err)
}
defer RemoveAll(path)
// Stat of path should succeed.
_, err = Stat(path)
if err != nil {
t.Fatal("stat failed:", err)
}
// Stat of path+"/" should succeed too.
_, err = Stat(path + "/")
if err != nil {
t.Fatal("stat failed:", err)
}
}