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Source file src/os/os_unix_test.go

Documentation: os

  // 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.
  
  // +build darwin dragonfly freebsd linux netbsd openbsd solaris
  
  package os_test
  
  import (
  	"io"
  	"io/ioutil"
  	. "os"
  	"path/filepath"
  	"runtime"
  	"strings"
  	"syscall"
  	"testing"
  )
  
  func init() {
  	isReadonlyError = func(err error) bool { return err == syscall.EROFS }
  }
  
  func checkUidGid(t *testing.T, path string, uid, gid int) {
  	dir, err := Lstat(path)
  	if err != nil {
  		t.Fatalf("Lstat %q (looking for uid/gid %d/%d): %s", path, uid, gid, err)
  	}
  	sys := dir.Sys().(*syscall.Stat_t)
  	if int(sys.Uid) != uid {
  		t.Errorf("Lstat %q: uid %d want %d", path, sys.Uid, uid)
  	}
  	if int(sys.Gid) != gid {
  		t.Errorf("Lstat %q: gid %d want %d", path, sys.Gid, gid)
  	}
  }
  
  func TestChown(t *testing.T) {
  	// Chown is not supported under windows or Plan 9.
  	// Plan9 provides a native ChownPlan9 version instead.
  	if runtime.GOOS == "windows" || runtime.GOOS == "plan9" {
  		t.Skipf("%s does not support syscall.Chown", runtime.GOOS)
  	}
  	// 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)
  	}
  	sys := dir.Sys().(*syscall.Stat_t)
  	checkUidGid(t, f.Name(), int(sys.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(), int(sys.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(), int(sys.Uid), gid)
  	}
  }
  
  func TestFileChown(t *testing.T) {
  	// Fchown is not supported under windows or Plan 9.
  	if runtime.GOOS == "windows" || runtime.GOOS == "plan9" {
  		t.Skipf("%s does not support syscall.Fchown", runtime.GOOS)
  	}
  	// 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("TestFileChown", 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 = f.Chown(-1, gid); err != nil {
  		t.Fatalf("fchown %s -1 %d: %s", f.Name(), gid, err)
  	}
  	sys := dir.Sys().(*syscall.Stat_t)
  	checkUidGid(t, f.Name(), int(sys.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 = f.Chown(-1, g); err != nil {
  			t.Fatalf("fchown %s -1 %d: %s", f.Name(), g, err)
  		}
  		checkUidGid(t, f.Name(), int(sys.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(), int(sys.Uid), gid)
  	}
  }
  
  func TestLchown(t *testing.T) {
  	// Lchown is not supported under windows or Plan 9.
  	if runtime.GOOS == "windows" || runtime.GOOS == "plan9" {
  		t.Skipf("%s does not support syscall.Lchown", runtime.GOOS)
  	}
  	// 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("TestLchown", t)
  	defer Remove(f.Name())
  	defer f.Close()
  	dir, err := f.Stat()
  	if err != nil {
  		t.Fatalf("stat %s: %s", f.Name(), err)
  	}
  
  	linkname := f.Name() + "2"
  	if err := Symlink(f.Name(), linkname); err != nil {
  		if runtime.GOOS == "android" && IsPermission(err) {
  			t.Skip("skipping test on Android; permission error creating symlink")
  		}
  		t.Fatalf("link %s -> %s: %v", f.Name(), linkname, err)
  	}
  	defer Remove(linkname)
  
  	// 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 = Lchown(linkname, -1, gid); err != nil {
  		t.Fatalf("lchown %s -1 %d: %s", linkname, gid, err)
  	}
  	sys := dir.Sys().(*syscall.Stat_t)
  	checkUidGid(t, linkname, int(sys.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 = Lchown(linkname, -1, g); err != nil {
  			t.Fatalf("lchown %s -1 %d: %s", linkname, g, err)
  		}
  		checkUidGid(t, linkname, int(sys.Uid), g)
  
  		// Check that link target's gid is unchanged.
  		checkUidGid(t, f.Name(), int(sys.Uid), int(sys.Gid))
  	}
  }
  
  // Issue 16919: Readdir must return a non-empty slice or an error.
  func TestReaddirRemoveRace(t *testing.T) {
  	oldStat := *LstatP
  	defer func() { *LstatP = oldStat }()
  	*LstatP = func(name string) (FileInfo, error) {
  		if strings.HasSuffix(name, "some-file") {
  			// Act like it's been deleted.
  			return nil, ErrNotExist
  		}
  		return oldStat(name)
  	}
  	dir := newDir("TestReaddirRemoveRace", t)
  	defer RemoveAll(dir)
  	if err := ioutil.WriteFile(filepath.Join(dir, "some-file"), []byte("hello"), 0644); err != nil {
  		t.Fatal(err)
  	}
  	d, err := Open(dir)
  	if err != nil {
  		t.Fatal(err)
  	}
  	defer d.Close()
  	fis, err := d.Readdir(2) // notably, greater than zero
  	if len(fis) == 0 && err == nil {
  		// This is what used to happen (Issue 16919)
  		t.Fatal("Readdir = empty slice & err == nil")
  	}
  	if len(fis) != 0 || err != io.EOF {
  		t.Errorf("Readdir = %d entries: %v; want 0, io.EOF", len(fis), err)
  		for i, fi := range fis {
  			t.Errorf("  entry[%d]: %q, %v", i, fi.Name(), fi.Mode())
  		}
  		t.FailNow()
  	}
  }
  

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