// Symlink creates a symbolic link.
func Symlink(oldname, newname string) Error {
e := syscall.Symlink(oldname, newname)
if e != 0 {
return &LinkError{"symlink", oldname, newname, Errno(e)}
}
return nil
}
// Symlink creates newname as a symbolic link to oldname.
// If there is an error, it will be of type *LinkError.
func Symlink(oldname, newname string) error {
e := syscall.Symlink(oldname, newname)
if e != nil {
return &LinkError{"symlink", oldname, newname, e}
}
return nil
}
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)
}
// Symlink implements pathfs.Filesystem.
func (fs *FS) Symlink(target string, linkName string, context *fuse.Context) (code fuse.Status) {
tlog.Debug.Printf("Symlink(\"%s\", \"%s\")", target, linkName)
if fs.isFiltered(linkName) {
return fuse.EPERM
}
cPath, err := fs.getBackingPath(linkName)
if err != nil {
return fuse.ToStatus(err)
}
if fs.args.PlaintextNames {
err = os.Symlink(target, cPath)
return fuse.ToStatus(err)
}
// Symlinks are encrypted like file contents (GCM) and base64-encoded
cBinTarget := fs.contentEnc.EncryptBlock([]byte(target), 0, nil)
cTarget := base64.URLEncoding.EncodeToString(cBinTarget)
// Handle long file name
cName := filepath.Base(cPath)
if nametransform.IsLongContent(cName) {
var dirfd *os.File
dirfd, err = os.Open(filepath.Dir(cPath))
if err != nil {
return fuse.ToStatus(err)
}
defer dirfd.Close()
// Create ".name" file
err = fs.nameTransform.WriteLongName(dirfd, cName, linkName)
if err != nil {
return fuse.ToStatus(err)
}
// Create "gocryptfs.longfile." symlink
// TODO use syscall.Symlinkat once it is available in Go
err = syscall.Symlink(cTarget, cPath)
if err != nil {
nametransform.DeleteLongName(dirfd, cName)
}
} else {
// Create symlink
err = os.Symlink(cTarget, cPath)
}
if err != nil {
return fuse.ToStatus(err)
}
// Set owner
if fs.args.PreserveOwner {
err = os.Lchown(cPath, int(context.Owner.Uid), int(context.Owner.Gid))
if err != nil {
tlog.Warn.Printf("Mknod: Lchown failed: %v", err)
}
}
return fuse.OK
}
// Returns true if there were any operations performed
func updateDisk(files_to_add filesOfCatalog,
files_to_remove filesOfCatalog,
catalog_root string) bool {
changes_made := false
for catspec, files_by_path := range files_to_add {
for path, link := range files_by_path {
tgt_path := filepath.Join(catalog_root, catspec.Catrel, catspec.Arch,
shortenOsrel(catspec.Osrel), path)
if link.link_type == hardlink {
src_path := filepath.Join(catalog_root, "allpkgs", path)
if !DryRun {
if err := syscall.Link(src_path, tgt_path); err != nil {
log.Fatalf("Could not create hardlink from %v to %v: %v",
src_path, tgt_path, err)
}
}
log.Printf("ln \"%s\"\n \"%s\"\n", src_path, tgt_path)
changes_made = true
} else if link.link_type == symlink {
// The source path is relative to the target, because it's a symlink
src_path := *(link.target)
if !DryRun {
if err := syscall.Symlink(src_path, tgt_path); err != nil {
log.Fatalf("Could not symlink %v to %v: %v", src_path, tgt_path, err)
}
}
log.Printf("ln -s \"%s\"\n \"%s\"\n", src_path, tgt_path)
changes_made = true
} else {
log.Fatalln("Zonk! Wrong link type in %+v", link)
}
}
}
for catspec, files_by_path := range files_to_remove {
for path, _ := range files_by_path {
pkg_path := filepath.Join(catalog_root, catspec.Catrel, catspec.Arch,
shortenOsrel(catspec.Osrel), path)
if !DryRun {
if err := syscall.Unlink(pkg_path); err != nil {
log.Fatalf("Could not unlink %v: %v", pkg_path, err)
}
}
log.Printf("rm \"%s\"\n", pkg_path)
changes_made = true
}
}
return changes_made
}
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)
}
func (fs *Filesystem) CreateSymlink(oldpath, newpath string) error {
if err := syscall.Symlink(oldpath, fs.absPath(newpath)); err != nil {
return fmt.Errorf("failed to symlink %s to %s: %v", fs.absPath(newpath), oldpath, err)
}
return nil
}
func (s syscallImpl) Symlink(oldname, newname string) error {
return syscall.Symlink(oldname, newname)
}
func (k *PosixKernel) Symlink(src, dst string) uint64 {
return Errno(syscall.Symlink(src, dst))
}
func ln(target, source string, isdir bool) error {
var fi os.FileInfo
var err error
statp := os.Stat
if Pflag {
statp = os.Lstat
}
if !sflag {
fi, err = statp(target)
if err != nil {
return err
}
// only symbolic links to directory
if fi.IsDir() {
return fmt.Errorf("%s is a directory", target)
}
}
// if the source is a directory, append the target's name
statl := os.Stat
if hflag {
statl = os.Lstat
}
if isdir {
fi, err = statl(source)
if err == nil && fi.IsDir() {
base := filepath.Base(target)
if base == "" {
return fmt.Errorf("%s", target)
}
source = filepath.Join(source, base)
}
}
fi, err = os.Lstat(source)
if err == nil && !sflag {
tfi, err := statp(target)
if err != nil {
return fmt.Errorf("%s: dissapeared", target)
}
st, ok1 := fi.Sys().(*syscall.Stat_t)
sb, ok2 := tfi.Sys().(*syscall.Stat_t)
if ok1 && ok2 && st.Dev == sb.Dev && st.Ino == sb.Ino {
if fflag {
return nil
} else {
return fmt.Errorf("%s and %s are identical (nothing done).", target, source)
}
}
}
if fflag {
err = syscall.Unlink(source)
} else if sflag {
err = syscall.Symlink(target, source)
} else {
follow := 0
if !Pflag {
follow = unix.AT_SYMLINK_FOLLOW
}
err = unix.Linkat(unix.AT_FDCWD, target, unix.AT_FDCWD, source, follow)
}
return err
}
func handleInstall(c *cli.Context) {
OzConfig = loadConfig()
pname := c.Args()[0]
OzProfile, err := loadProfile(pname, OzConfig.ProfileDir)
if err != nil || OzProfile == nil {
installExit(c.Bool("hook"), fmt.Errorf("Unable to load profiles for %s (%v).\n", pname, err))
return // For clarity
}
if OzConfig.DivertSuffix == "" {
installExit(c.Bool("hook"), fmt.Errorf("Divert requires a suffix to be set.\n"))
return // For clarity
}
divertInstall := func(cpath string) {
isInstalled, err := isDivertInstalled(cpath)
if err != nil {
fmt.Fprintf(os.Stderr, "Unknown error: %+v\n", err)
os.Exit(1)
}
if isInstalled == true {
fmt.Println("Divert already installed for ", cpath)
if c.Bool("force") {
return
}
os.Exit(0)
}
dpkgArgs := []string{
"--add",
"--package",
"oz",
"--rename",
"--divert",
getBinaryPath(cpath),
cpath,
}
_, err = exec.Command(PathDpkgDivert, dpkgArgs...).Output()
if err != nil {
fmt.Fprintf(os.Stderr, "Dpkg divert command `%s %+s` failed: %s", PathDpkgDivert, dpkgArgs, err)
os.Exit(1)
}
clientbin := path.Join(OzConfig.PrefixPath, "bin", "oz")
err = syscall.Symlink(clientbin, cpath)
if err != nil {
fmt.Fprintf(os.Stderr, "Failed to create symlink %s", err)
os.Exit(1)
}
fmt.Printf("Successfully installed Oz sandbox for: %s.\n", cpath)
}
paths := append([]string{}, OzProfile.Path)
paths = append(paths, OzProfile.Paths...)
for _, pp := range paths {
divertInstall(pp)
}
fmt.Printf("Successfully installed Oz sandbox for: %s.\n", OzProfile.Name)
}
