func (constor *Constor) Symlink(header *fuse.InHeader, pointedTo string, linkName string, out *fuse.EntryOut) (code fuse.Status) {
inode := constor.inodemap.findInodePtr(header.NodeId)
if inode == nil {
constor.error("inode == nil")
return fuse.ENOENT
}
err := constor.copyup(inode)
if err != nil {
constor.error("copyup failed for %s - %s", inode.id, err)
return fuse.ToStatus(err)
}
dirpath := constor.getPath(0, inode.id)
entrypath := Path.Join(dirpath, linkName)
constor.log("%s <- %s/%s", pointedTo, inode.id, linkName)
syscall.Unlink(entrypath) // remove a deleted entry
err = syscall.Symlink(pointedTo, entrypath)
if err != nil {
constor.error("Symlink failed %s <- %s : %s", pointedTo, entrypath, err)
return fuse.ToStatus(err)
}
id := constor.setid(entrypath, "")
if id == "" {
constor.error("setid failed on %s", entrypath)
return fuse.ENOENT
}
if err := constor.createPath(id); err != nil {
constor.error("createPath failed on %s : %s", id, err)
return fuse.ToStatus(err)
}
path := constor.getPath(0, id)
err = syscall.Symlink(pointedTo, path)
if err != nil {
constor.error("Symlink failed %s <- %s : %s", pointedTo, path, err)
return fuse.ToStatus(err)
}
err = syscall.Lchown(path, int(header.Uid), int(header.Gid))
if err != nil {
constor.error("Chown failed on %s : %s", path, err)
return fuse.ToStatus(err)
}
return constor.Lookup(header, linkName, out)
}
func (constor *Constor) Symlink(header *fuse.InHeader, pointedTo string, linkName string, out *fuse.EntryOut) (code fuse.Status) {
constor.log("%d %s <- %s, uid: %d, gid: %d", header.NodeId, pointedTo, linkName, header.Uid, header.Gid)
parentino := header.NodeId
path, err := constor.dentrymap.getPath(parentino)
if err != nil {
return fuse.ToStatus(err)
}
if err = constor.createPath(path); err != nil {
return fuse.ToStatus(err)
}
pathl := Path.Join(constor.layers[0], path, linkName)
syscall.Unlink(pathl) // remove a deleted entry
err = syscall.Symlink(pointedTo, pathl)
if err != nil {
return fuse.ToStatus(err)
}
err = syscall.Lchown(pathl, int(header.Uid), int(header.Gid))
if err != nil {
return fuse.ToStatus(err)
}
return constor.Lookup(header, linkName, out)
}
// ApplyLayer parses a diff in the standard layer format from `layer`, and
// applies it to the directory `dest`.
func ApplyLayer(dest string, layer Archive) error {
// We need to be able to set any perms
oldmask := syscall.Umask(0)
defer syscall.Umask(oldmask)
layer, err := DecompressStream(layer)
if err != nil {
return err
}
tr := tar.NewReader(layer)
var dirs []*tar.Header
// Iterate through the files in the archive.
for {
hdr, err := tr.Next()
if err == io.EOF {
// end of tar archive
break
}
if err != nil {
return err
}
// Normalize name, for safety and for a simple is-root check
hdr.Name = filepath.Clean(hdr.Name)
if !strings.HasSuffix(hdr.Name, "/") {
// Not the root directory, ensure that the parent directory exists
// This happened in some tests where an image had a tarfile without any
// parent directories
parent := filepath.Dir(hdr.Name)
parentPath := filepath.Join(dest, parent)
if _, err := os.Lstat(parentPath); err != nil && os.IsNotExist(err) {
err = os.MkdirAll(parentPath, 600)
if err != nil {
return err
}
}
}
// Skip AUFS metadata dirs
if strings.HasPrefix(hdr.Name, ".wh..wh.") {
continue
}
path := filepath.Join(dest, hdr.Name)
base := filepath.Base(path)
if strings.HasPrefix(base, ".wh.") {
originalBase := base[len(".wh."):]
originalPath := filepath.Join(filepath.Dir(path), originalBase)
if err := os.RemoveAll(originalPath); err != nil {
return err
}
} else {
// If path exits we almost always just want to remove and replace it
// The only exception is when it is a directory *and* the file from
// the layer is also a directory. Then we want to merge them (i.e.
// just apply the metadata from the layer).
hasDir := false
if fi, err := os.Lstat(path); err == nil {
if fi.IsDir() && hdr.Typeflag == tar.TypeDir {
hasDir = true
} else {
if err := os.RemoveAll(path); err != nil {
return err
}
}
}
switch hdr.Typeflag {
case tar.TypeDir:
if !hasDir {
err = os.Mkdir(path, os.FileMode(hdr.Mode))
if err != nil {
return err
}
}
dirs = append(dirs, hdr)
case tar.TypeReg, tar.TypeRegA:
// Source is regular file
file, err := os.OpenFile(path, os.O_CREATE|os.O_WRONLY, os.FileMode(hdr.Mode))
if err != nil {
return err
}
if _, err := io.Copy(file, tr); err != nil {
file.Close()
return err
}
file.Close()
case tar.TypeBlock, tar.TypeChar, tar.TypeFifo:
mode := uint32(hdr.Mode & 07777)
switch hdr.Typeflag {
case tar.TypeBlock:
mode |= syscall.S_IFBLK
case tar.TypeChar:
mode |= syscall.S_IFCHR
case tar.TypeFifo:
mode |= syscall.S_IFIFO
}
if err := syscall.Mknod(path, mode, int(mkdev(hdr.Devmajor, hdr.Devminor))); err != nil {
return err
}
case tar.TypeLink:
if err := os.Link(filepath.Join(dest, hdr.Linkname), path); err != nil {
return err
}
case tar.TypeSymlink:
if err := os.Symlink(hdr.Linkname, path); err != nil {
return err
}
default:
utils.Debugf("unhandled type %d\n", hdr.Typeflag)
}
if err = syscall.Lchown(path, hdr.Uid, hdr.Gid); err != nil {
return err
}
// There is no LChmod, so ignore mode for symlink. Also, this
// must happen after chown, as that can modify the file mode
if hdr.Typeflag != tar.TypeSymlink {
err = syscall.Chmod(path, uint32(hdr.Mode&07777))
if err != nil {
return err
}
}
// Directories must be handled at the end to avoid further
// file creation in them to modify the mtime
if hdr.Typeflag != tar.TypeDir {
ts := []syscall.Timespec{timeToTimespec(hdr.AccessTime), timeToTimespec(hdr.ModTime)}
// syscall.UtimesNano doesn't support a NOFOLLOW flag atm, and
if hdr.Typeflag != tar.TypeSymlink {
if err := syscall.UtimesNano(path, ts); err != nil {
return err
}
} else {
if err := LUtimesNano(path, ts); err != nil {
return err
}
}
}
}
}
for _, hdr := range dirs {
path := filepath.Join(dest, hdr.Name)
ts := []syscall.Timespec{timeToTimespec(hdr.AccessTime), timeToTimespec(hdr.ModTime)}
if err := syscall.UtimesNano(path, ts); err != nil {
return err
}
}
return nil
}
// Lchown changes the numeric uid and gid of the named file.
// If the file is a symbolic link, it changes the uid and gid of the link itself.
// If there is an error, it will be of type *PathError.
func Lchown(name string, uid, gid int) error {
if e := syscall.Lchown(name, uid, gid); e != nil {
return &PathError{"lchown", name, e}
}
return nil
}
// Lchown changes the numeric uid and gid of the named file.
// If the file is a symbolic link, it changes the uid and gid of the link itself.
func Lchown(name string, uid, gid int) Error {
if e := syscall.Lchown(name, uid, gid); e != 0 {
return &PathError{"lchown", name, Errno(e)}
}
return nil
}
func createTarFile(path, extractDir string, hdr *tar.Header, reader *tar.Reader) error {
switch hdr.Typeflag {
case tar.TypeDir:
// Create directory unless it exists as a directory already.
// In that case we just want to merge the two
if fi, err := os.Lstat(path); !(err == nil && fi.IsDir()) {
if err := os.Mkdir(path, os.FileMode(hdr.Mode)); err != nil {
return err
}
}
case tar.TypeReg, tar.TypeRegA:
// Source is regular file
file, err := os.OpenFile(path, os.O_CREATE|os.O_WRONLY, os.FileMode(hdr.Mode))
if err != nil {
return err
}
if _, err := io.Copy(file, reader); err != nil {
file.Close()
return err
}
file.Close()
case tar.TypeBlock, tar.TypeChar, tar.TypeFifo:
mode := uint32(hdr.Mode & 07777)
switch hdr.Typeflag {
case tar.TypeBlock:
mode |= syscall.S_IFBLK
case tar.TypeChar:
mode |= syscall.S_IFCHR
case tar.TypeFifo:
mode |= syscall.S_IFIFO
}
if err := syscall.Mknod(path, mode, int(mkdev(hdr.Devmajor, hdr.Devminor))); err != nil {
return err
}
case tar.TypeLink:
if err := os.Link(filepath.Join(extractDir, hdr.Linkname), path); err != nil {
return err
}
case tar.TypeSymlink:
if err := os.Symlink(hdr.Linkname, path); err != nil {
return err
}
case tar.TypeXGlobalHeader:
utils.Debugf("PAX Global Extended Headers found and ignored")
return nil
default:
return fmt.Errorf("Unhandled tar header type %d\n", hdr.Typeflag)
}
if err := syscall.Lchown(path, hdr.Uid, hdr.Gid); err != nil {
return err
}
// There is no LChmod, so ignore mode for symlink. Also, this
// must happen after chown, as that can modify the file mode
if hdr.Typeflag != tar.TypeSymlink {
if err := syscall.Chmod(path, uint32(hdr.Mode&07777)); err != nil {
return err
}
}
ts := []syscall.Timespec{timeToTimespec(hdr.AccessTime), timeToTimespec(hdr.ModTime)}
// syscall.UtimesNano doesn't support a NOFOLLOW flag atm, and
if hdr.Typeflag != tar.TypeSymlink {
if err := syscall.UtimesNano(path, ts); err != nil {
return err
}
} else {
if err := LUtimesNano(path, ts); err != nil {
return err
}
}
return nil
}
func (constor *Constor) copyup(inode *Inode) error {
src, err := constor.getPath(inode.ino)
if err != nil {
return err
}
dst, err := constor.dentrymap.getPath(inode.ino)
if err != nil {
return err
}
err = constor.createPath(Path.Dir(dst))
if err != nil {
return err
}
dst = Path.Join(constor.layers[0], dst)
fi, err := os.Lstat(src)
if err != nil {
return err
}
if fi.Mode()&os.ModeSymlink == os.ModeSymlink {
linkName, err := os.Readlink(src)
if err != nil {
return err
}
err = os.Symlink(linkName, dst)
if err != nil {
return err
}
} else if fi.Mode()&os.ModeDir == os.ModeDir {
err := os.Mkdir(dst, fi.Mode())
if err != nil {
return err
}
} else {
in, err := os.Open(src)
if err != nil {
return err
}
defer in.Close()
out, err := os.Create(dst)
if err != nil {
return err
}
defer out.Close()
_, err = io.Copy(out, in)
if err != nil {
return err
}
err = out.Close()
if err != nil {
return err
}
}
stat := syscall.Stat_t{}
if err = syscall.Lstat(src, &stat); err != nil {
return err
}
if fi.Mode()&os.ModeSymlink != os.ModeSymlink {
if err = syscall.Chmod(dst, stat.Mode); err != nil {
return err
}
}
if err = syscall.Lchown(dst, int(stat.Uid), int(stat.Gid)); err != nil {
return err
}
if fi.Mode()&os.ModeSymlink != os.ModeSymlink {
if err = syscall.UtimesNano(dst, []syscall.Timespec{stat.Atim, stat.Mtim}); err != nil {
return err
}
}
inoitoa := strconv.Itoa(int(stat.Ino))
inobyte := []byte(inoitoa)
// if err = syscall.Setxattr(dst, INOXATTR, inobyte, 0); err != nil {
// return err
// }
if err = Lsetxattr(dst, INOXATTR, inobyte, 0); err != nil {
return err
}
inode.layer = 0
path, err := constor.dentrymap.getPath(inode.ino)
constor.log("ino %d file %s", inode.ino, path)
return nil
}
func (k *PosixKernel) Lchown(path string, uid, gid int) uint64 {
return Errno(syscall.Lchown(path, uid, gid))
}
func (constor *Constor) copyup(inode *Inode) error {
constor.log("%s", inode.id)
if inode.layer == 0 {
return nil
}
src := constor.getPath(inode.layer, inode.id)
if src == "" {
return syscall.EIO
}
dst := constor.getPath(0, inode.id)
if dst == "" {
return syscall.EIO
}
fi, err := os.Lstat(src)
if err != nil {
return err
}
if fi.Mode()&os.ModeSymlink == os.ModeSymlink {
linkName, err := os.Readlink(src)
if err != nil {
return err
}
err = os.Symlink(linkName, dst)
if err != nil {
return err
}
} else if fi.Mode()&os.ModeDir == os.ModeDir {
err := os.Mkdir(dst, fi.Mode())
if err != nil {
return err
}
} else {
in, err := os.Open(src)
if err != nil {
return err
}
defer in.Close()
out, err := os.Create(dst)
if err != nil {
return err
}
defer out.Close()
_, err = io.Copy(out, in)
if err != nil {
return err
}
err = out.Close()
if err != nil {
return err
}
}
stat := syscall.Stat_t{}
if err = syscall.Lstat(src, &stat); err != nil {
return err
}
if fi.Mode()&os.ModeSymlink != os.ModeSymlink {
if err = syscall.Chmod(dst, stat.Mode); err != nil {
return err
}
}
if err = syscall.Lchown(dst, int(stat.Uid), int(stat.Gid)); err != nil {
return err
}
links, err := Lgetxattr(src, LINKSXATTR)
if err == nil && len(links) > 0 {
err := Lsetxattr(dst, LINKSXATTR, links, 0)
if err != nil {
return err
}
}
if fi.Mode()&os.ModeSymlink != os.ModeSymlink {
if err = syscall.UtimesNano(dst, []syscall.Timespec{stat.Atim, stat.Mtim}); err != nil {
return err
}
}
inode.layer = 0
constor.log("done", inode.id)
return nil
}
func (constor *Constor) SetAttr(input *fuse.SetAttrIn, out *fuse.AttrOut) fuse.Status {
var err error
uid := -1
gid := -1
inode := constor.inodemap.findInodePtr(input.NodeId)
if inode == nil {
constor.error("inode nil")
return fuse.EIO
}
constor.log("%s %d", inode.id, input.Valid)
// if ((input.Valid & fuse.FATTR_FH) !=0) && ((input.Valid & (fuse.FATTR_ATIME | fuse.FATTR_MTIME)) == 0) {
if ((input.Valid & fuse.FATTR_FH) != 0) && ((input.Valid & fuse.FATTR_SIZE) != 0) {
ptr := uintptr(input.Fh)
F := constor.getfd(ptr)
if F == nil {
constor.error("F == nil for %s", inode.id)
return fuse.EIO
}
if F.layer != 0 && inode.layer == -1 {
/* FIXME handle this valid case */
// file is in lower layer, opened, deleted, setattr-called
constor.error("FSetAttr F.layer=%d inode.layer=%d", F.layer, inode.layer)
return fuse.EIO
}
if F.layer != 0 && inode.layer != 0 {
err := constor.copyup(inode)
if err != nil {
constor.error("copyup failed for %s - %s", inode.id, err)
return fuse.ToStatus(err)
}
path := constor.getPath(0, inode.id)
syscall.Close(F.fd)
fd, err := syscall.Open(path, F.flags, 0)
if err != nil {
constor.error("open failed on %s - %s", path, err)
return fuse.ToStatus(err)
}
F.fd = fd
F.layer = 0
constor.log("reset fd for %s", path)
} else if F.layer != 0 && inode.layer == 0 {
// when some other process already has done a copyup
syscall.Close(F.fd)
path := constor.getPath(0, inode.id)
fd, err := syscall.Open(path, F.flags, 0)
if err != nil {
constor.error("open failed on %s - %s", path, err)
return fuse.ToStatus(err)
}
F.fd = fd
F.layer = 0
constor.log("reset fd for %s", path)
}
if F.layer != 0 {
constor.error("layer not 0")
return fuse.EIO
}
if input.Valid&fuse.FATTR_MODE != 0 {
permissions := uint32(07777) & input.Mode
err = syscall.Fchmod(F.fd, permissions)
if err != nil {
constor.error("Fchmod failed on %s - %d : %s", F.id, permissions, err)
return fuse.ToStatus(err)
}
}
if input.Valid&(fuse.FATTR_UID) != 0 {
uid = int(input.Uid)
}
if input.Valid&(fuse.FATTR_GID) != 0 {
gid = int(input.Gid)
}
if input.Valid&(fuse.FATTR_UID|fuse.FATTR_GID) != 0 {
err = syscall.Fchown(F.fd, uid, gid)
if err != nil {
constor.error("Fchown failed on %s - %d %d : %s", F.id, uid, gid, err)
return fuse.ToStatus(err)
}
}
if input.Valid&fuse.FATTR_SIZE != 0 {
err := syscall.Ftruncate(F.fd, int64(input.Size))
if err != nil {
constor.error("Ftruncate failed on %s - %d : %s", F.id, input.Size, err)
return fuse.ToStatus(err)
}
}
if input.Valid&(fuse.FATTR_ATIME|fuse.FATTR_MTIME|fuse.FATTR_ATIME_NOW|fuse.FATTR_MTIME_NOW) != 0 {
now := time.Now()
var tv []syscall.Timeval
tv = make([]syscall.Timeval, 2)
if input.Valid&fuse.FATTR_ATIME_NOW != 0 {
tv[0].Sec = now.Unix()
tv[0].Usec = now.UnixNano() / 1000
} else {
tv[0].Sec = int64(input.Atime)
tv[0].Usec = int64(input.Atimensec / 1000)
}
if input.Valid&fuse.FATTR_MTIME_NOW != 0 {
tv[1].Sec = now.Unix()
tv[1].Usec = now.UnixNano() / 1000
} else {
tv[1].Sec = int64(input.Atime)
tv[1].Usec = int64(input.Atimensec / 1000)
}
err := syscall.Futimes(F.fd, tv)
if err != nil {
constor.error("Futimes failed on %s : %s", F.id, err)
return fuse.ToStatus(err)
}
}
stat := syscall.Stat_t{}
err = syscall.Fstat(F.fd, &stat)
if err != nil {
constor.error("Fstat failed on %s : %s", F.id, err)
return fuse.ToStatus(err)
}
attr := (*fuse.Attr)(&out.Attr)
attr.FromStat(&stat)
attr.Ino = idtoino(inode.id)
return fuse.OK
}
if inode.layer == -1 {
return fuse.ENOENT
}
if inode.layer != 0 {
err = constor.copyup(inode)
if err != nil {
constor.error("copyup failed for %s - %s", inode.id, err)
return fuse.ToStatus(err)
}
}
stat := syscall.Stat_t{}
path := constor.getPath(0, inode.id)
// just to satisfy PJD tests
if input.Valid == 0 {
err = syscall.Lchown(path, uid, gid)
if err != nil {
return fuse.ToStatus(err)
}
}
if input.Valid&fuse.FATTR_MODE != 0 {
permissions := uint32(07777) & input.Mode
err = syscall.Chmod(path, permissions)
if err != nil {
constor.error("Lchmod failed on %s - %d : %s", path, permissions, err)
return fuse.ToStatus(err)
}
}
if input.Valid&(fuse.FATTR_UID) != 0 {
uid = int(input.Uid)
}
if input.Valid&(fuse.FATTR_GID) != 0 {
gid = int(input.Gid)
}
if input.Valid&(fuse.FATTR_UID|fuse.FATTR_GID) != 0 {
constor.log("%s %d %d", path, uid, gid)
err = syscall.Lchown(path, uid, gid)
if err != nil {
constor.error("Lchown failed on %s - %d %d : %s", path, uid, gid, err)
return fuse.ToStatus(err)
}
}
if input.Valid&fuse.FATTR_SIZE != 0 {
err = syscall.Truncate(path, int64(input.Size))
if err != nil {
constor.error("Truncate failed on %s - %d : %s", path, input.Size, err)
return fuse.ToStatus(err)
}
}
if input.Valid&(fuse.FATTR_ATIME|fuse.FATTR_MTIME|fuse.FATTR_ATIME_NOW|fuse.FATTR_MTIME_NOW) != 0 {
now := time.Now()
var atime *time.Time
var mtime *time.Time
if input.Valid&fuse.FATTR_ATIME_NOW != 0 {
atime = &now
} else {
t := time.Unix(int64(input.Atime), int64(input.Atimensec))
atime = &t
}
if input.Valid&fuse.FATTR_MTIME_NOW != 0 {
mtime = &now
} else {
t := time.Unix(int64(input.Mtime), int64(input.Mtimensec))
mtime = &t
}
fi, err := os.Lstat(path)
if err != nil {
return fuse.ToStatus(err)
}
if fi.Mode()&os.ModeSymlink != os.ModeSymlink {
// FIXME: there is no Lchtimes
err = os.Chtimes(path, *atime, *mtime)
if err != nil {
constor.error("Chtimes failed on %s : %s", path, err)
return fuse.ToStatus(err)
}
} else {
constor.error("Chtimes on Symlink not supported")
}
}
attr := (*fuse.Attr)(&out.Attr)
err = constor.Lstat(inode.layer, inode.id, &stat)
if err != nil {
constor.error("Lstat failed on %s : %s", inode.id, err)
return fuse.ToStatus(err)
}
attr.FromStat(&stat)
attr.Ino = stat.Ino
return fuse.ToStatus(err)
}