Struct wasi_cap_std_sync::Dir

pub struct Dir { /* fields omitted */ }

A reference to an open directory on a filesystem.

This does not directly correspond to anything in std, however its methods correspond to the functions in std::fs and the constructor methods for std::fs::File.

Unlike std::fs, this API’s canonicalize returns a relative path since absolute paths don’t interoperate well with the capability model.

Implementations

impl Dir

pub fn from_std_file(std_file: File) -> Dir

Constructs a new instance of Self from the given std::fs::File.

To prevent race conditions on Windows, the file must be opened without FILE_SHARE_DELETE.

This grants access the resources the std::fs::File instance already has access to.

pub fn into_std_file(self) -> File

Consumes self and returns a std::fs::File.

pub fn open<P>(&self, path: P) -> Result<File, Error> where
    P: AsRef<Path>, 

Attempts to open a file in read-only mode.

This corresponds to std::fs::File::open, but only accesses paths relative to self.

pub fn open_with<P>(
    &self,
    path: P,
    options: &OpenOptions
) -> Result<File, Error> where
    P: AsRef<Path>, 

Opens a file at path with the options specified by options.

This corresponds to std::fs::OpenOptions::open.

Instead of being a method on OpenOptions, this is a method on Dir, and it only accesses paths relative to self.

pub fn open_dir<P>(&self, path: P) -> Result<Dir, Error> where
    P: AsRef<Path>, 

Attempts to open a directory.

pub fn create_dir<P>(&self, path: P) -> Result<(), Error> where
    P: AsRef<Path>, 

Creates a new, empty directory at the provided path.

This corresponds to std::fs::create_dir, but only accesses paths relative to self.

pub fn create_dir_all<P>(&self, path: P) -> Result<(), Error> where
    P: AsRef<Path>, 

Recursively create a directory and all of its parent components if they are missing.

This corresponds to std::fs::create_dir_all, but only accesses paths relative to self.

pub fn create_dir_with<P>(
    &self,
    path: P,
    dir_builder: &DirBuilder
) -> Result<(), Error> where
    P: AsRef<Path>, 

Creates the specified directory with the options configured in this builder.

This corresponds to std::fs::DirBuilder::create.

pub fn create<P>(&self, path: P) -> Result<File, Error> where
    P: AsRef<Path>, 

Opens a file in write-only mode.

This corresponds to std::fs::File::create, but only accesses paths relative to self.

pub fn canonicalize<P>(&self, path: P) -> Result<PathBuf, Error> where
    P: AsRef<Path>, 

Returns the canonical form of a path with all intermediate components normalized and symbolic links resolved.

This corresponds to std::fs::canonicalize, but instead of returning an absolute path, returns a path relative to the directory represented by self.

pub fn copy<P, Q>(&self, from: P, to_dir: &Dir, to: Q) -> Result<u64, Error> where
    P: AsRef<Path>,
    Q: AsRef<Path>, 

Copies the contents of one file to another. This function will also copy the permission bits of the original file to the destination file.

This corresponds to std::fs::copy, but only accesses paths relative to self.

pub fn hard_link<P, Q>(
    &self,
    src: P,
    dst_dir: &Dir,
    dst: Q
) -> Result<(), Error> where
    P: AsRef<Path>,
    Q: AsRef<Path>, 

Creates a new hard link on a filesystem.

This corresponds to std::fs::hard_link, but only accesses paths relative to self.

pub fn metadata<P>(&self, path: P) -> Result<Metadata, Error> where
    P: AsRef<Path>, 

Given a path, query the file system to get information about a file, directory, etc.

This corresponds to std::fs::metadata, but only accesses paths relative to self.

pub fn dir_metadata(&self) -> Result<Metadata, Error>

Queries metadata about the underlying directory.

This is similar to std::fs::File::metadata, but for Dir rather than for File.

pub fn entries(&self) -> Result<ReadDir, Error>

Returns an iterator over the entries within self.

pub fn read_dir<P>(&self, path: P) -> Result<ReadDir, Error> where
    P: AsRef<Path>, 

Returns an iterator over the entries within a directory.

This corresponds to std::fs::read_dir, but only accesses paths relative to self.

pub fn read<P>(&self, path: P) -> Result<Vec<u8, Global>, Error> where
    P: AsRef<Path>, 

Read the entire contents of a file into a bytes vector.

This corresponds to std::fs::read, but only accesses paths relative to self.

pub fn read_link<P>(&self, path: P) -> Result<PathBuf, Error> where
    P: AsRef<Path>, 

Reads a symbolic link, returning the file that the link points to.

This corresponds to std::fs::read_link, but only accesses paths relative to self.

pub fn read_to_string<P>(&self, path: P) -> Result<String, Error> where
    P: AsRef<Path>, 

Read the entire contents of a file into a string.

This corresponds to std::fs::read_to_string, but only accesses paths relative to self.

pub fn remove_dir<P>(&self, path: P) -> Result<(), Error> where
    P: AsRef<Path>, 

Removes an empty directory.

This corresponds to std::fs::remove_dir, but only accesses paths relative to self.

pub fn remove_dir_all<P>(&self, path: P) -> Result<(), Error> where
    P: AsRef<Path>, 

Removes a directory at this path, after removing all its contents. Use carefully!

This corresponds to std::fs::remove_dir_all, but only accesses paths relative to self.

pub fn remove_open_dir(self) -> Result<(), Error>

Remove the directory referenced by self and consume self.

Note that even though this implementation works in terms of handles as much as possible, removal is not guaranteed to be atomic with respect to a concurrent rename of the directory.

pub fn remove_open_dir_all(self) -> Result<(), Error>

Removes the directory referenced by self, after removing all its contents, and consume self. Use carefully!

Note that even though this implementation works in terms of handles as much as possible, removal is not guaranteed to be atomic with respect to a concurrent rename of the directory.

pub fn remove_file<P>(&self, path: P) -> Result<(), Error> where
    P: AsRef<Path>, 

Removes a file from a filesystem.

This corresponds to std::fs::remove_file, but only accesses paths relative to self.

pub fn rename<P, Q>(&self, from: P, to_dir: &Dir, to: Q) -> Result<(), Error> where
    P: AsRef<Path>,
    Q: AsRef<Path>, 

Rename a file or directory to a new name, replacing the original file if to already exists.

This corresponds to std::fs::rename, but only accesses paths relative to self.

pub fn set_permissions<P>(
    &self,
    path: P,
    perm: Permissions
) -> Result<(), Error> where
    P: AsRef<Path>, 

Changes the permissions found on a file or a directory.

This corresponds to std::fs::set_permissions, but only accesses paths relative to self. Also, on some platforms, this function may fail if the file or directory cannot be opened for reading or writing first.

pub fn symlink_metadata<P>(&self, path: P) -> Result<Metadata, Error> where
    P: AsRef<Path>, 

Query the metadata about a file without following symlinks.

This corresponds to std::fs::symlink_metadata, but only accesses paths relative to self.

pub fn write<P, C>(&self, path: P, contents: C) -> Result<(), Error> where
    P: AsRef<Path>,
    C: AsRef<[u8]>, 

Write a slice as the entire contents of a file.

This corresponds to std::fs::write, but only accesses paths relative to self.

pub fn symlink<P, Q>(&self, src: P, dst: Q) -> Result<(), Error> where
    P: AsRef<Path>,
    Q: AsRef<Path>, 

Creates a new symbolic link on a filesystem.

This corresponds to std::os::unix::fs::symlink, but only accesses paths relative to self.

pub fn bind_unix_listener<P>(&self, path: P) -> Result<UnixListener, Error> where
    P: AsRef<Path>, 

Creates a new UnixListener bound to the specified socket.

This corresponds to std::os::unix::net::UnixListener::bind, but only accesses paths relative to self.

XXX: This function is not yet implemented.

pub fn connect_unix_stream<P>(&self, path: P) -> Result<UnixStream, Error> where
    P: AsRef<Path>, 

Connects to the socket named by path.

This corresponds to std::os::unix::net::UnixStream::connect, but only accesses paths relative to self.

XXX: This function is not yet implemented.

pub fn bind_unix_datagram<P>(&self, path: P) -> Result<UnixDatagram, Error> where
    P: AsRef<Path>, 

Creates a Unix datagram socket bound to the given path.

This corresponds to std::os::unix::net::UnixDatagram::bind, but only accesses paths relative to self.

XXX: This function is not yet implemented.

pub fn connect_unix_datagram<P>(
    &self,
    _unix_datagram: &UnixDatagram,
    path: P
) -> Result<(), Error> where
    P: AsRef<Path>, 

Connects the socket to the specified address.

This corresponds to std::os::unix::net::UnixDatagram::connect, but only accesses paths relative to self.

XXX: This function is not yet implemented.

pub fn send_to_unix_datagram_addr<P>(
    &self,
    _unix_datagram: &UnixDatagram,
    buf: &[u8],
    path: P
) -> Result<usize, Error> where
    P: AsRef<Path>, 

Sends data on the socket to the specified address.

This corresponds to std::os::unix::net::UnixDatagram::send_to, but only accesses paths relative to self.

XXX: This function is not yet implemented.

pub fn try_clone(&self) -> Result<Dir, Error>

Creates a new Dir instance that shares the same underlying file handle as the existing Dir instance.

pub fn exists<P>(&self, path: P) -> bool where
    P: AsRef<Path>, 

Returns true if the path points at an existing entity.

This corresponds to std::path::Path::exists, but only accesses paths relative to self.

pub fn is_file<P>(&self, path: P) -> bool where
    P: AsRef<Path>, 

Returns true if the path exists on disk and is pointing at a regular file.

This corresponds to std::path::Path::is_file, but only accesses paths relative to self.

pub fn is_dir<P>(&self, path: P) -> bool where
    P: AsRef<Path>, 

Checks if path is a directory.

This is similar to std::path::Path::is_dir in that it checks if path relative to Dir is a directory. This function will traverse symbolic links to query information about the destination file. In case of broken symbolic links, this will return false.

pub fn open_ambient_dir<P>(
    path: P,
    ambient_authority: AmbientAuthority
) -> Result<Dir, Error> where
    P: AsRef<Path>, 

Constructs a new instance of Self by opening the given path as a directory using the host process’ ambient authority.

Ambient Authority

This function is not sandboxed and may access any path that the host process has access to.

pub fn open_parent_dir(
    &self,
    ambient_authority: AmbientAuthority
) -> Result<Dir, Error>

Constructs a new instance of Self by opening the parent directory (aka “..”) of self, using the host process’ ambient authority.

Ambient Authority

This function accesses a directory outside of the self subtree.

pub fn create_ambient_dir_all<P>(
    path: P,
    ambient_authority: AmbientAuthority
) -> Result<(), Error> where
    P: AsRef<Path>, 

Recursively create a directory and all of its parent components if they are missing, using the host process’ ambient authority.

Ambient Authority

This function is not sandboxed and may access any path that the host process has access to.

Trait Implementations

impl AsFd for Dir

pub fn as_fd(&self) -> BorrowedFd<'_>

Borrows the file descriptor.

impl AsRawFd for Dir

pub fn as_raw_fd(&self) -> i32

Extracts the raw file descriptor.

impl Debug for Dir

pub fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl DirExt for Dir

pub fn set_atime<P>(&self, path: P, atime: SystemTimeSpec) -> Result<(), Error> where
    P: AsRef<Path>, 

Set the last access time for a file on a filesystem.

pub fn set_mtime<P>(&self, path: P, mtime: SystemTimeSpec) -> Result<(), Error> where
    P: AsRef<Path>, 

Set the last modification time for a file on a filesystem.

pub fn set_times<P>(
    &self,
    path: P,
    atime: Option<SystemTimeSpec>,
    mtime: Option<SystemTimeSpec>
) -> Result<(), Error> where
    P: AsRef<Path>, 

Set the last access and modification times for a file on a filesystem.

pub fn set_symlink_times<P>(
    &self,
    path: P,
    atime: Option<SystemTimeSpec>,
    mtime: Option<SystemTimeSpec>
) -> Result<(), Error> where
    P: AsRef<Path>, 

Set the last access and modification times for a file on a filesystem. This function does not follow symlink.

pub fn symlink<P, Q>(&self, src: P, dst: Q) -> Result<(), Error> where
    P: AsRef<Path>,
    Q: AsRef<Path>, 

Creates a new symbolic link on a filesystem.

pub fn symlink_file<P, Q>(&self, src: P, dst: Q) -> Result<(), Error> where
    P: AsRef<Path>,
    Q: AsRef<Path>, 

Creates a new file symbolic link on a filesystem.

pub fn symlink_dir<P, Q>(&self, src: P, dst: Q) -> Result<(), Error> where
    P: AsRef<Path>,
    Q: AsRef<Path>, 

Creates a new directory symbolic link on a filesystem.

pub fn open_dir_nofollow<P>(&self, path: P) -> Result<Dir, Error> where
    P: AsRef<Path>, 

Similar to cap_std::fs::Dir::open_dir, but fails if the path names a symlink.

pub fn remove_file_or_symlink<P>(&self, path: P) -> Result<(), Error> where
    P: AsRef<Path>, 

Removes a file or symlink from a filesystem.

impl FromFd for Dir

pub fn from_fd(fd: OwnedFd) -> Dir

Constructs a new instance of Self from the given file descriptor.

fn from_into_fd<Owned>(into_owned: Owned) -> Self where
    Owned: IntoFd, 

Constructs a new instance of Self from the given file descriptor converted from into_owned.

impl FromRawFd for Dir

pub unsafe fn from_raw_fd(fd: i32) -> Dir

Constructs a new instance of Self from the given raw file descriptor.

impl IntoFd for Dir

pub fn into_fd(self) -> OwnedFd

Consumes this object, returning the underlying file descriptor.

impl IntoRawFd for Dir

pub fn into_raw_fd(self) -> i32

Consumes this object, returning the raw underlying file descriptor.