func Getfilecon(path string) (string, error) {
var scon []byte
cnt, err := syscall.Getxattr(path, xattrNameSelinux, scon)
scon = make([]byte, cnt)
cnt, err = syscall.Getxattr(path, xattrNameSelinux, scon)
return string(scon), err
}
// gets an attribute value as bytes
func (this FileXattribsNS) Get(tag string) ([]byte, error) {
if size, err := syscall.Getxattr(this.File.Name(), this.namespace+ssep+tag, nil); err == nil {
buf := make([]byte, size)
if read, err := syscall.Getxattr(this.File.Name(), this.namespace+ssep+tag, buf); err == nil {
return buf[:read], nil
} else {
return nil, err
}
} else {
return nil, err
}
}
// Retrieve extended attribute data associated with path.
func Getxattr(path, name string) ([]byte, error) {
name = userPrefix + name
// find size.
size, err := syscall.Getxattr(path, name, nil)
if err != nil {
return nil, &XAttrError{"getxattr", path, name, err}
}
buf := make([]byte, size)
// Read into buffer of that size.
read, err := syscall.Getxattr(path, name, buf)
if err != nil {
return nil, &XAttrError{"getxattr", path, name, err}
}
return buf[:read], nil
}
func listFlags(path string) (err error) {
exists := pathExists(path)
if !exists {
log.Printf("%s does not exist, cannot check PaX flags.\n",
path)
return
}
supported, err := isXattrSupported()
if err != nil {
return
}
if supported {
var flags []byte
sz, err := syscall.Getxattr(path, "user.pax.flags", flags)
if err != nil {
log.Println(err)
}
log.Println(sz)
log.Println(flags)
} else {
args := []string{"-v", path}
log.Println(args)
exec.Command("/sbin/paxctl").Run()
fmt.Fprintln(os.Stdout)
out, err := exec.Command("/sbin/paxctl", args...).Output()
if err != nil {
log.Println(err)
}
log.Printf("%s\n", out)
}
return
}
// gets splits which are aligned with the nearest linebreak to a file boundary
func GetFileSplits(filePath string) ([]Split, error) {
// open file and get size
f, err := os.Open(filePath)
if err != nil {
return nil, fmt.Errorf("Error opening %s for read : %s", filePath, err)
}
defer f.Close()
stat, err := os.Stat(filePath)
if err != nil {
return nil, fmt.Errorf("Error getting stat for file %s : %s", filePath, err)
}
fileSize := stat.Size()
// list blocks
blocLocBytes := make([]byte, 64*1024, 64*1024)
bytesLen, err := syscall.Getxattr(filePath, "user.mfs.blockLocs", blocLocBytes)
if err != nil {
return nil, err
}
blocLocStr := string(blocLocBytes[:bytesLen])
lines := strings.Split(blocLocStr, "\n")
ret := make([]Split, 0, len(lines))
// find first linebreak after each to make splits
for _, line := range lines {
if line == "" {
continue
}
lineSplits := strings.Split(line, "\t")
if len(lineSplits) < 3 {
return nil, fmt.Errorf("Error, improperly formatted blockLocs line (less than 3 elements): %s", line)
}
blockStartPos, err := strconv.ParseInt(lineSplits[0], 10, 64)
if err != nil {
return nil, fmt.Errorf("Error, blockStartPos not a number! %s : %s", err, line)
}
blockEndPos, err := strconv.ParseInt(lineSplits[1], 10, 64)
if err != nil {
return nil, fmt.Errorf("Error, blockEndPos not a number! %s : %s", err, line)
}
if blockStartPos > 0 {
blockStartPos, err = nextLineBreak(f, blockStartPos)
if err != nil {
return nil, err
}
}
if blockEndPos < fileSize {
blockEndPos, err = nextLineBreak(f, blockEndPos)
if err != nil {
return nil, err
}
}
blockHosts := strings.Split(lineSplits[2], ",")
if len(blockHosts) != 0 {
ret = append(ret, Split{filePath, blockHosts[0], blockStartPos, blockEndPos})
}
}
return ret, nil
}
func TestDefaultXAttr(t *testing.T) {
dir := testutil.TempDir()
defer os.RemoveAll(dir)
root := &xattrNode{
Node: nodefs.NewDefaultNode(),
}
opts := nodefs.NewOptions()
opts.Debug = testutil.VerboseTest()
s, _, err := nodefs.MountRoot(dir, root, opts)
if err != nil {
t.Fatalf("MountRoot: %v", err)
}
go s.Serve()
if err := s.WaitMount(); err != nil {
t.Fatal("WaitMount", err)
}
defer s.Unmount()
var data [1024]byte
sz, err := syscall.Getxattr(filepath.Join(dir, "child"), "attr", data[:])
if err != nil {
t.Fatalf("Getxattr: %v", err)
} else if val := string(data[:sz]); val != "value" {
t.Fatalf("got %v, want 'value'", val)
}
}
// updates an attribute, returns error if attribute not pre-existing.
func (this *FileXattribsNS) Update(tag string, data []byte) error {
if _, err := syscall.Getxattr(this.File.Name(), this.namespace+ssep+tag, nil); err == nil {
return this.Set(tag, data)
} else {
return err
}
}
// GetXAttr returns the extended attribute value from the path.
func GetXAttr(path, name string) ([]byte, error) {
var attr = make([]byte, XAttrValueBufferSize)
size, err := syscall.Getxattr(path, name, attr)
if err != nil {
return attr, err
}
return attr[0:size], nil
}
func (e *EncodedAttr) ReadXAttr(path string) (hash []byte) {
b := make([]byte, 64)
val, errno := syscall.Getxattr(path, _TERM_XATTR, b)
if errno == nil {
// TODO needs test.
return e.Decode(b[:val])
}
return nil
}
func (constor *Constor) isdeleted(pathl string) bool {
var inobyte []byte
inobyte = make([]byte, 100, 100)
if _, err := syscall.Getxattr(pathl, DELXATTR, inobyte); err == nil {
return true
} else {
return false
}
}
func (r *RealFileReader) GetAttr(n string) ([]byte, error) {
tmp := make([]byte, 256)
sz, err := syscall.Getxattr(r.path, n, tmp)
if err != nil {
return nil, err
} else {
return tmp[:sz], nil
}
}
// based on libacl's acl_get_file
func getType(path, attr string) (ACL, error) {
buf := bufpool.Get().([]byte)
defer func() { bufpool.Put(buf) }()
sz, err := syscall.Getxattr(path, attr, buf)
if sz == -1 && err == syscall.ERANGE {
sz, err = syscall.Getxattr(path, attr, nil)
if sz <= 0 {
return nil, err
}
buf = make([]byte, sz)
sz, err = syscall.Getxattr(path, attr, buf)
}
switch {
case sz > 0:
return aclFromXattr(buf[:sz])
case err == syscall.ENODATA:
// TODO(joshlf): acl_get_file also checks for ENOATTR,
// but it's not defined in syscall?
fi, err := os.Stat(path)
if err != nil {
return nil, err
}
if attr == aclEADefault {
if fi.IsDir() {
return nil, nil
}
return nil, syscall.EACCES
} else {
return FromUnix(fi.Mode()), nil
}
default:
return nil, err
}
}
func setOrHasXattr(path, n, v string) error {
if err := syscall.Setxattr(path, n, []byte(v), 1); err == nil {
return nil
} else if !os.IsExist(err) {
return err
}
tab := make([]byte, 256)
sz, err := syscall.Getxattr(path, n, tab)
if err != nil {
return err
}
if bytes.Equal([]byte(v), tab[:sz]) {
return nil
} else {
return errors.New("XATTR mismatch")
}
}
func TestXAttrCaching(t *testing.T) {
wd, _ := ioutil.TempDir("", "unionfs")
defer os.RemoveAll(wd)
os.Mkdir(wd+"/mnt", 0700)
err := os.Mkdir(wd+"/rw", 0700)
if err != nil {
t.Fatalf("Mkdir failed: %v", err)
}
rwFS := pathfs.NewLoopbackFileSystem(wd + "/rw")
roFS := &TestFS{
FileSystem: pathfs.NewDefaultFileSystem(),
}
ufs, err := NewUnionFs([]pathfs.FileSystem{rwFS,
NewCachingFileSystem(roFS, entryTtl)}, testOpts)
if err != nil {
t.Fatalf("NewUnionFs: %v", err)
}
opts := &nodefs.Options{
EntryTimeout: entryTtl / 2,
AttrTimeout: entryTtl / 2,
NegativeTimeout: entryTtl / 2,
}
pathfs := pathfs.NewPathNodeFs(ufs,
&pathfs.PathNodeFsOptions{ClientInodes: true})
server, conn, err := nodefs.MountRoot(wd+"/mnt", pathfs.Root(), opts)
if err != nil {
t.Fatalf("MountNodeFileSystem failed: %v", err)
}
server.SetDebug(VerboseTest())
conn.SetDebug(VerboseTest())
pathfs.SetDebug(VerboseTest())
defer server.Unmount()
go server.Serve()
if fi, err := os.Lstat(wd + "/mnt"); err != nil || !fi.IsDir() {
t.Fatalf("root not readable: %v, %v", err, fi)
}
buf := make([]byte, 1024)
n, err := syscall.Getxattr(wd+"/mnt/file", "user.attr", buf)
if err != nil {
t.Fatalf("Getxattr: %v", err)
}
want := "\x2a"
got := string(buf[:n])
if got != want {
t.Fatalf("Got %q want %q", got, err)
}
time.Sleep(entryTtl / 2)
n, err = syscall.Getxattr(wd+"/mnt/file", "user.attr", buf)
if err != nil {
t.Fatalf("Getxattr: %v", err)
}
got = string(buf[:n])
if got != want {
t.Fatalf("Got %q want %q", got, err)
}
server.Unmount()
if roFS.xattrRead != 1 {
t.Errorf("got xattrRead=%d, want 1", roFS.xattrRead)
}
}
// Darwin doesn't have support for syscall.Getxattr() so we pull it into its own file and implement it by hand on Darwin.
func Getxattr(path string, attr string, dest []byte) (sz int, err error) {
return syscall.Getxattr(path, attr, dest)
}