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// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
//! Filesystem manipulation operations
//!
//! This module contains basic methods to manipulate the contents of the local
//! filesystem. All methods in this module represent cross-platform filesystem
//! operations. Extra platform-specific functionality can be found in the
//! extension traits of `std::os::$platform`.
#![stable(feature = "rust1", since = "1.0.0")]
use fmt;
use ffi::OsString;
use io::{self, SeekFrom, Seek, Read, Write};
use path::{Path, PathBuf};
use sys::fs as fs_imp;
use sys_common::io::read_to_end_uninitialized;
use sys_common::{AsInnerMut, FromInner, AsInner, IntoInner};
use vec::Vec;
/// A reference to an open file on the filesystem.
///
/// An instance of a `File` can be read and/or written depending on what options
/// it was opened with. Files also implement `Seek` to alter the logical cursor
/// that the file contains internally.
///
/// # Examples
///
/// ```no_run
/// use std::io::prelude::*;
/// use std::fs::File;
///
/// # fn foo() -> std::io::Result<()> {
/// let mut f = try!(File::create("foo.txt"));
/// try!(f.write_all(b"Hello, world!"));
///
/// let mut f = try!(File::open("foo.txt"));
/// let mut s = String::new();
/// try!(f.read_to_string(&mut s));
/// assert_eq!(s, "Hello, world!");
/// # Ok(())
/// # }
/// ```
#[stable(feature = "rust1", since = "1.0.0")]
pub struct File {
inner: fs_imp::File,
}
/// Metadata information about a file.
///
/// This structure is returned from the `metadata` function or method and
/// represents known metadata about a file such as its permissions, size,
/// modification times, etc.
#[stable(feature = "rust1", since = "1.0.0")]
#[derive(Clone)]
pub struct Metadata(fs_imp::FileAttr);
/// Iterator over the entries in a directory.
///
/// This iterator is returned from the `read_dir` function of this module and
/// will yield instances of `io::Result<DirEntry>`. Through a `DirEntry`
/// information like the entry's path and possibly other metadata can be
/// learned.
///
/// # Failure
///
/// This `io::Result` will be an `Err` if there's some sort of intermittent
/// IO error during iteration.
#[stable(feature = "rust1", since = "1.0.0")]
pub struct ReadDir(fs_imp::ReadDir);
/// Entries returned by the `ReadDir` iterator.
///
/// An instance of `DirEntry` represents an entry inside of a directory on the
/// filesystem. Each entry can be inspected via methods to learn about the full
/// path or possibly other metadata through per-platform extension traits.
#[stable(feature = "rust1", since = "1.0.0")]
pub struct DirEntry(fs_imp::DirEntry);
/// An iterator that recursively walks over the contents of a directory.
#[unstable(feature = "fs_walk",
reason = "the precise semantics and defaults for a recursive walk \
may change and this may end up accounting for files such \
as symlinks differently",
issue = "27707")]
#[rustc_deprecated(reason = "superceded by the walkdir crate",
since = "1.6.0")]
pub struct WalkDir {
cur: Option<ReadDir>,
stack: Vec<io::Result<ReadDir>>,
}
/// Options and flags which can be used to configure how a file is opened.
///
/// This builder exposes the ability to configure how a `File` is opened and
/// what operations are permitted on the open file. The `File::open` and
/// `File::create` methods are aliases for commonly used options using this
/// builder.
///
/// Generally speaking, when using `OpenOptions`, you'll first call `new()`,
/// then chain calls to methods to set each option, then call `open()`, passing
/// the path of the file you're trying to open. This will give you a
/// [`io::Result`][result] with a [`File`][file] inside that you can further
/// operate on.
///
/// [result]: ../io/type.Result.html
/// [file]: struct.File.html
///
/// # Examples
///
/// Opening a file to read:
///
/// ```no_run
/// use std::fs::OpenOptions;
///
/// let file = OpenOptions::new().read(true).open("foo.txt");
/// ```
///
/// Opening a file for both reading and writing, as well as creating it if it
/// doesn't exist:
///
/// ```no_run
/// use std::fs::OpenOptions;
///
/// let file = OpenOptions::new()
/// .read(true)
/// .write(true)
/// .create(true)
/// .open("foo.txt");
/// ```
#[derive(Clone)]
#[stable(feature = "rust1", since = "1.0.0")]
pub struct OpenOptions(fs_imp::OpenOptions);
/// Representation of the various permissions on a file.
///
/// This module only currently provides one bit of information, `readonly`,
/// which is exposed on all currently supported platforms. Unix-specific
/// functionality, such as mode bits, is available through the
/// `os::unix::PermissionsExt` trait.
#[derive(Clone, PartialEq, Eq, Debug)]
#[stable(feature = "rust1", since = "1.0.0")]
pub struct Permissions(fs_imp::FilePermissions);
/// An structure representing a type of file with accessors for each file type.
#[stable(feature = "file_type", since = "1.1.0")]
#[derive(Copy, Clone, PartialEq, Eq, Hash)]
pub struct FileType(fs_imp::FileType);
/// A builder used to create directories in various manners.
///
/// This builder also supports platform-specific options.
#[stable(feature = "dir_builder", since = "1.6.0")]
pub struct DirBuilder {
inner: fs_imp::DirBuilder,
recursive: bool,
}
impl File {
/// Attempts to open a file in read-only mode.
///
/// See the `OpenOptions::open` method for more details.
///
/// # Errors
///
/// This function will return an error if `path` does not already exist.
/// Other errors may also be returned according to `OpenOptions::open`.
///
/// # Examples
///
/// ```no_run
/// use std::fs::File;
///
/// # fn foo() -> std::io::Result<()> {
/// let mut f = try!(File::open("foo.txt"));
/// # Ok(())
/// # }
/// ```
#[stable(feature = "rust1", since = "1.0.0")]
pub fn open<P: AsRef<Path>>(path: P) -> io::Result<File> {
OpenOptions::new().read(true).open(path.as_ref())
}
/// Opens a file in write-only mode.
///
/// This function will create a file if it does not exist,
/// and will truncate it if it does.
///
/// See the `OpenOptions::open` function for more details.
///
/// # Examples
///
/// ```no_run
/// use std::fs::File;
///
/// # fn foo() -> std::io::Result<()> {
/// let mut f = try!(File::create("foo.txt"));
/// # Ok(())
/// # }
/// ```
#[stable(feature = "rust1", since = "1.0.0")]
pub fn create<P: AsRef<Path>>(path: P) -> io::Result<File> {
OpenOptions::new().write(true).create(true).truncate(true).open(path.as_ref())
}
/// Attempts to sync all OS-internal metadata to disk.
///
/// This function will attempt to ensure that all in-core data reaches the
/// filesystem before returning.
///
/// # Examples
///
/// ```no_run
/// use std::fs::File;
/// use std::io::prelude::*;
///
/// # fn foo() -> std::io::Result<()> {
/// let mut f = try!(File::create("foo.txt"));
/// try!(f.write_all(b"Hello, world!"));
///
/// try!(f.sync_all());
/// # Ok(())
/// # }
/// ```
#[stable(feature = "rust1", since = "1.0.0")]
pub fn sync_all(&self) -> io::Result<()> {
self.inner.fsync()
}
/// This function is similar to `sync_all`, except that it may not
/// synchronize file metadata to the filesystem.
///
/// This is intended for use cases that must synchronize content, but don't
/// need the metadata on disk. The goal of this method is to reduce disk
/// operations.
///
/// Note that some platforms may simply implement this in terms of
/// `sync_all`.
///
/// # Examples
///
/// ```no_run
/// use std::fs::File;
/// use std::io::prelude::*;
///
/// # fn foo() -> std::io::Result<()> {
/// let mut f = try!(File::create("foo.txt"));
/// try!(f.write_all(b"Hello, world!"));
///
/// try!(f.sync_data());
/// # Ok(())
/// # }
/// ```
#[stable(feature = "rust1", since = "1.0.0")]
pub fn sync_data(&self) -> io::Result<()> {
self.inner.datasync()
}
/// Truncates or extends the underlying file, updating the size of
/// this file to become `size`.
///
/// If the `size` is less than the current file's size, then the file will
/// be shrunk. If it is greater than the current file's size, then the file
/// will be extended to `size` and have all of the intermediate data filled
/// in with 0s.
///
/// # Errors
///
/// This function will return an error if the file is not opened for writing.
///
/// # Examples
///
/// ```no_run
/// use std::fs::File;
///
/// # fn foo() -> std::io::Result<()> {
/// let mut f = try!(File::create("foo.txt"));
/// try!(f.set_len(10));
/// # Ok(())
/// # }
/// ```
#[stable(feature = "rust1", since = "1.0.0")]
pub fn set_len(&self, size: u64) -> io::Result<()> {
self.inner.truncate(size)
}
/// Queries metadata about the underlying file.
///
/// # Examples
///
/// ```no_run
/// use std::fs::File;
///
/// # fn foo() -> std::io::Result<()> {
/// let mut f = try!(File::open("foo.txt"));
/// let metadata = try!(f.metadata());
/// # Ok(())
/// # }
/// ```
#[stable(feature = "rust1", since = "1.0.0")]
pub fn metadata(&self) -> io::Result<Metadata> {
self.inner.file_attr().map(Metadata)
}
}
impl AsInner<fs_imp::File> for File {
fn as_inner(&self) -> &fs_imp::File { &self.inner }
}
impl FromInner<fs_imp::File> for File {
fn from_inner(f: fs_imp::File) -> File {
File { inner: f }
}
}
impl IntoInner<fs_imp::File> for File {
fn into_inner(self) -> fs_imp::File {
self.inner
}
}
#[stable(feature = "rust1", since = "1.0.0")]
impl fmt::Debug for File {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
self.inner.fmt(f)
}
}
#[stable(feature = "rust1", since = "1.0.0")]
impl Read for File {
fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
self.inner.read(buf)
}
fn read_to_end(&mut self, buf: &mut Vec<u8>) -> io::Result<usize> {
unsafe { read_to_end_uninitialized(self, buf) }
}
}
#[stable(feature = "rust1", since = "1.0.0")]
impl Write for File {
fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
self.inner.write(buf)
}
fn flush(&mut self) -> io::Result<()> { self.inner.flush() }
}
#[stable(feature = "rust1", since = "1.0.0")]
impl Seek for File {
fn seek(&mut self, pos: SeekFrom) -> io::Result<u64> {
self.inner.seek(pos)
}
}
#[stable(feature = "rust1", since = "1.0.0")]
impl<'a> Read for &'a File {
fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
self.inner.read(buf)
}
}
#[stable(feature = "rust1", since = "1.0.0")]
impl<'a> Write for &'a File {
fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
self.inner.write(buf)
}
fn flush(&mut self) -> io::Result<()> { self.inner.flush() }
}
#[stable(feature = "rust1", since = "1.0.0")]
impl<'a> Seek for &'a File {
fn seek(&mut self, pos: SeekFrom) -> io::Result<u64> {
self.inner.seek(pos)
}
}
impl OpenOptions {
/// Creates a blank net set of options ready for configuration.
///
/// All options are initially set to `false`.
///
/// # Examples
///
/// ```no_run
/// use std::fs::OpenOptions;
///
/// let file = OpenOptions::new().open("foo.txt");
/// ```
#[stable(feature = "rust1", since = "1.0.0")]
pub fn new() -> OpenOptions {
OpenOptions(fs_imp::OpenOptions::new())
}
/// Sets the option for read access.
///
/// This option, when true, will indicate that the file should be
/// `read`-able if opened.
///
/// # Examples
///
/// ```no_run
/// use std::fs::OpenOptions;
///
/// let file = OpenOptions::new().read(true).open("foo.txt");
/// ```
#[stable(feature = "rust1", since = "1.0.0")]
pub fn read(&mut self, read: bool) -> &mut OpenOptions {
self.0.read(read); self
}
/// Sets the option for write access.
///
/// This option, when true, will indicate that the file should be
/// `write`-able if opened.
///
/// # Examples
///
/// ```no_run
/// use std::fs::OpenOptions;
///
/// let file = OpenOptions::new().write(true).open("foo.txt");
/// ```
#[stable(feature = "rust1", since = "1.0.0")]
pub fn write(&mut self, write: bool) -> &mut OpenOptions {
self.0.write(write); self
}
/// Sets the option for the append mode.
///
/// This option, when true, means that writes will append to a file instead
/// of overwriting previous contents.
///
/// # Examples
///
/// ```no_run
/// use std::fs::OpenOptions;
///
/// let file = OpenOptions::new().write(true).append(true).open("foo.txt");
/// ```
#[stable(feature = "rust1", since = "1.0.0")]
pub fn append(&mut self, append: bool) -> &mut OpenOptions {
self.0.append(append); self
}
/// Sets the option for truncating a previous file.
///
/// If a file is successfully opened with this option set it will truncate
/// the file to 0 length if it already exists.
///
/// # Examples
///
/// ```no_run
/// use std::fs::OpenOptions;
///
/// let file = OpenOptions::new().write(true).truncate(true).open("foo.txt");
/// ```
#[stable(feature = "rust1", since = "1.0.0")]
pub fn truncate(&mut self, truncate: bool) -> &mut OpenOptions {
self.0.truncate(truncate); self
}
/// Sets the option for creating a new file.
///
/// This option indicates whether a new file will be created if the file
/// does not yet already exist.
///
/// # Examples
///
/// ```no_run
/// use std::fs::OpenOptions;
///
/// let file = OpenOptions::new().create(true).open("foo.txt");
/// ```
#[stable(feature = "rust1", since = "1.0.0")]
pub fn create(&mut self, create: bool) -> &mut OpenOptions {
self.0.create(create); self
}
/// Opens a file at `path` with the options specified by `self`.
///
/// # Errors
///
/// This function will return an error under a number of different
/// circumstances, to include but not limited to:
///
/// * Opening a file that does not exist with read access.
/// * Attempting to open a file with access that the user lacks
/// permissions for
/// * Filesystem-level errors (full disk, etc)
///
/// # Examples
///
/// ```no_run
/// use std::fs::OpenOptions;
///
/// let file = OpenOptions::new().open("foo.txt");
/// ```
#[stable(feature = "rust1", since = "1.0.0")]
pub fn open<P: AsRef<Path>>(&self, path: P) -> io::Result<File> {
self._open(path.as_ref())
}
fn _open(&self, path: &Path) -> io::Result<File> {
let inner = try!(fs_imp::File::open(path, &self.0));
Ok(File { inner: inner })
}
}
impl AsInnerMut<fs_imp::OpenOptions> for OpenOptions {
fn as_inner_mut(&mut self) -> &mut fs_imp::OpenOptions { &mut self.0 }
}
impl Metadata {
/// Returns the file type for this metadata.
#[stable(feature = "file_type", since = "1.1.0")]
pub fn file_type(&self) -> FileType {
FileType(self.0.file_type())
}
/// Returns whether this metadata is for a directory.
///
/// # Examples
///
/// ```
/// # fn foo() -> std::io::Result<()> {
/// use std::fs;
///
/// let metadata = try!(fs::metadata("foo.txt"));
///
/// assert!(!metadata.is_dir());
/// # Ok(())
/// # }
/// ```
#[stable(feature = "rust1", since = "1.0.0")]
pub fn is_dir(&self) -> bool { self.file_type().is_dir() }
/// Returns whether this metadata is for a regular file.
///
/// # Examples
///
/// ```
/// # fn foo() -> std::io::Result<()> {
/// use std::fs;
///
/// let metadata = try!(fs::metadata("foo.txt"));
///
/// assert!(metadata.is_file());
/// # Ok(())
/// # }
/// ```
#[stable(feature = "rust1", since = "1.0.0")]
pub fn is_file(&self) -> bool { self.file_type().is_file() }
/// Returns the size of the file, in bytes, this metadata is for.
///
/// # Examples
///
/// ```
/// # fn foo() -> std::io::Result<()> {
/// use std::fs;
///
/// let metadata = try!(fs::metadata("foo.txt"));
///
/// assert_eq!(0, metadata.len());
/// # Ok(())
/// # }
/// ```
#[stable(feature = "rust1", since = "1.0.0")]
pub fn len(&self) -> u64 { self.0.size() }
/// Returns the permissions of the file this metadata is for.
///
/// # Examples
///
/// ```
/// # fn foo() -> std::io::Result<()> {
/// use std::fs;
///
/// let metadata = try!(fs::metadata("foo.txt"));
///
/// assert!(!metadata.permissions().readonly());
/// # Ok(())
/// # }
/// ```
#[stable(feature = "rust1", since = "1.0.0")]
pub fn permissions(&self) -> Permissions {
Permissions(self.0.perm())
}
}
impl AsInner<fs_imp::FileAttr> for Metadata {
fn as_inner(&self) -> &fs_imp::FileAttr { &self.0 }
}
impl Permissions {
/// Returns whether these permissions describe a readonly file.
///
/// # Examples
///
/// ```
/// use std::fs::File;
///
/// # fn foo() -> std::io::Result<()> {
/// let mut f = try!(File::create("foo.txt"));
/// let metadata = try!(f.metadata());
///
/// assert_eq!(false, metadata.permissions().readonly());
/// # Ok(())
/// # }
/// ```
#[stable(feature = "rust1", since = "1.0.0")]
pub fn readonly(&self) -> bool { self.0.readonly() }
/// Modifies the readonly flag for this set of permissions.
///
/// This operation does **not** modify the filesystem. To modify the
/// filesystem use the `fs::set_permissions` function.
///
/// # Examples
///
/// ```
/// use std::fs::File;
///
/// # fn foo() -> std::io::Result<()> {
/// let f = try!(File::create("foo.txt"));
/// let metadata = try!(f.metadata());
/// let mut permissions = metadata.permissions();
///
/// permissions.set_readonly(true);
///
/// // filesystem doesn't change
/// assert_eq!(false, metadata.permissions().readonly());
///
/// // just this particular `permissions`.
/// assert_eq!(true, permissions.readonly());
/// # Ok(())
/// # }
/// ```
#[stable(feature = "rust1", since = "1.0.0")]
pub fn set_readonly(&mut self, readonly: bool) {
self.0.set_readonly(readonly)
}
}
impl FileType {
/// Test whether this file type represents a directory.
#[stable(feature = "file_type", since = "1.1.0")]
pub fn is_dir(&self) -> bool { self.0.is_dir() }
/// Test whether this file type represents a regular file.
#[stable(feature = "file_type", since = "1.1.0")]
pub fn is_file(&self) -> bool { self.0.is_file() }
/// Test whether this file type represents a symbolic link.
#[stable(feature = "file_type", since = "1.1.0")]
pub fn is_symlink(&self) -> bool { self.0.is_symlink() }
}
impl AsInner<fs_imp::FileType> for FileType {
fn as_inner(&self) -> &fs_imp::FileType { &self.0 }
}
impl FromInner<fs_imp::FilePermissions> for Permissions {
fn from_inner(f: fs_imp::FilePermissions) -> Permissions {
Permissions(f)
}
}
impl AsInner<fs_imp::FilePermissions> for Permissions {
fn as_inner(&self) -> &fs_imp::FilePermissions { &self.0 }
}
#[stable(feature = "rust1", since = "1.0.0")]
impl Iterator for ReadDir {
type Item = io::Result<DirEntry>;
fn next(&mut self) -> Option<io::Result<DirEntry>> {
self.0.next().map(|entry| entry.map(DirEntry))
}
}
impl DirEntry {
/// Returns the full path to the file that this entry represents.
///
/// The full path is created by joining the original path to `read_dir` or
/// `walk_dir` with the filename of this entry.
///
/// # Examples
///
/// ```
/// use std::fs;
/// # fn foo() -> std::io::Result<()> {
/// for entry in try!(fs::read_dir(".")) {
/// let dir = try!(entry);
/// println!("{:?}", dir.path());
/// }
/// # Ok(())
/// # }
/// ```
///
/// This prints output like:
///
/// ```text
/// "./whatever.txt"
/// "./foo.html"
/// "./hello_world.rs"
/// ```
///
/// The exact text, of course, depends on what files you have in `.`.
#[stable(feature = "rust1", since = "1.0.0")]
pub fn path(&self) -> PathBuf { self.0.path() }
/// Return the metadata for the file that this entry points at.
///
/// This function will not traverse symlinks if this entry points at a
/// symlink.
///
/// # Platform-specific behavior
///
/// On Windows this function is cheap to call (no extra system calls
/// needed), but on Unix platforms this function is the equivalent of
/// calling `symlink_metadata` on the path.
#[stable(feature = "dir_entry_ext", since = "1.1.0")]
pub fn metadata(&self) -> io::Result<Metadata> {
self.0.metadata().map(Metadata)
}
/// Return the file type for the file that this entry points at.
///
/// This function will not traverse symlinks if this entry points at a
/// symlink.
///
/// # Platform-specific behavior
///
/// On Windows and most Unix platforms this function is free (no extra
/// system calls needed), but some Unix platforms may require the equivalent
/// call to `symlink_metadata` to learn about the target file type.
#[stable(feature = "dir_entry_ext", since = "1.1.0")]
pub fn file_type(&self) -> io::Result<FileType> {
self.0.file_type().map(FileType)
}
/// Returns the bare file name of this directory entry without any other
/// leading path component.
#[stable(feature = "dir_entry_ext", since = "1.1.0")]
pub fn file_name(&self) -> OsString {
self.0.file_name()
}
}
impl AsInner<fs_imp::DirEntry> for DirEntry {
fn as_inner(&self) -> &fs_imp::DirEntry { &self.0 }
}
/// Removes a file from the filesystem.
///
/// Note that there is no
/// guarantee that the file is immediately deleted (e.g. depending on
/// platform, other open file descriptors may prevent immediate removal).
///
/// # Platform-specific behavior
///
/// This function currently corresponds to the `unlink` function on Unix
/// and the `DeleteFile` function on Windows.
/// Note that, this [may change in the future][changes].
/// [changes]: ../io/index.html#platform-specific-behavior
///
/// # Errors
///
/// This function will return an error in the following situations, but is not
/// limited to just these cases:
///
/// * `path` points to a directory.
/// * The user lacks permissions to remove the file.
///
/// # Examples
///
/// ```
/// use std::fs;
///
/// # fn foo() -> std::io::Result<()> {
/// try!(fs::remove_file("a.txt"));
/// # Ok(())
/// # }
/// ```
#[stable(feature = "rust1", since = "1.0.0")]
pub fn remove_file<P: AsRef<Path>>(path: P) -> io::Result<()> {
fs_imp::unlink(path.as_ref())
}
/// Given a path, query the file system to get information about a file,
/// directory, etc.
///
/// This function will traverse symbolic links to query information about the
/// destination file.
///
/// # Platform-specific behavior
///
/// This function currently corresponds to the `stat` function on Unix
/// and the `GetFileAttributesEx` function on Windows.
/// Note that, this [may change in the future][changes].
/// [changes]: ../io/index.html#platform-specific-behavior
///
/// # Errors
///
/// This function will return an error in the following situations, but is not
/// limited to just these cases:
///
/// * The user lacks permissions to perform `metadata` call on `path`.
/// * `path` does not exist.
///
/// # Examples
///
/// ```rust
/// # fn foo() -> std::io::Result<()> {
/// use std::fs;
///
/// let attr = try!(fs::metadata("/some/file/path.txt"));
/// // inspect attr ...
/// # Ok(())
/// # }
/// ```
#[stable(feature = "rust1", since = "1.0.0")]
pub fn metadata<P: AsRef<Path>>(path: P) -> io::Result<Metadata> {
fs_imp::stat(path.as_ref()).map(Metadata)
}
/// Query the metadata about a file without following symlinks.
///
/// # Platform-specific behavior
///
/// This function currently corresponds to the `lstat` function on Unix
/// and the `GetFileAttributesEx` function on Windows.
/// Note that, this [may change in the future][changes].
/// [changes]: ../io/index.html#platform-specific-behavior
///
/// # Errors
///
/// This function will return an error in the following situations, but is not
/// limited to just these cases:
///
/// * The user lacks permissions to perform `metadata` call on `path`.
/// * `path` does not exist.
///
/// # Examples
///
/// ```rust
/// # fn foo() -> std::io::Result<()> {
/// use std::fs;
///
/// let attr = try!(fs::symlink_metadata("/some/file/path.txt"));
/// // inspect attr ...
/// # Ok(())
/// # }
/// ```
#[stable(feature = "symlink_metadata", since = "1.1.0")]
pub fn symlink_metadata<P: AsRef<Path>>(path: P) -> io::Result<Metadata> {
fs_imp::lstat(path.as_ref()).map(Metadata)
}
/// Rename a file or directory to a new name.
///
/// This will not work if the new name is on a different mount point.
///
/// # Platform-specific behavior
///
/// This function currently corresponds to the `rename` function on Unix
/// and the `MoveFileEx` function with the `MOVEFILE_REPLACE_EXISTING` flag on Windows.
/// Note that, this [may change in the future][changes].
/// [changes]: ../io/index.html#platform-specific-behavior
///
/// # Errors
///
/// This function will return an error in the following situations, but is not
/// limited to just these cases:
///
/// * `from` does not exist.
/// * The user lacks permissions to view contents.
/// * `from` and `to` are on separate filesystems.
///
/// # Examples
///
/// ```
/// use std::fs;
///
/// # fn foo() -> std::io::Result<()> {
/// try!(fs::rename("a.txt", "b.txt")); // Rename a.txt to b.txt
/// # Ok(())
/// # }
/// ```
#[stable(feature = "rust1", since = "1.0.0")]
pub fn rename<P: AsRef<Path>, Q: AsRef<Path>>(from: P, to: Q) -> io::Result<()> {
fs_imp::rename(from.as_ref(), to.as_ref())
}
/// 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 function will **overwrite** the contents of `to`.
///
/// Note that if `from` and `to` both point to the same file, then the file
/// will likely get truncated by this operation.
///
/// On success, the total number of bytes copied is returned.
///
/// # Platform-specific behavior
///
/// This function currently corresponds to the `open` function in Unix
/// with `O_RDONLY` for `from` and `O_WRONLY`, `O_CREAT`, and `O_TRUNC` for `to`.
/// `O_CLOEXEC` is set for returned file descriptors.
/// On Windows, this function currently corresponds to `CopyFileEx`.
/// Note that, this [may change in the future][changes].
/// [changes]: ../io/index.html#platform-specific-behavior
///
/// # Errors
///
/// This function will return an error in the following situations, but is not
/// limited to just these cases:
///
/// * The `from` path is not a file.
/// * The `from` file does not exist.
/// * The current process does not have the permission rights to access
/// `from` or write `to`.
///
/// # Examples
///
/// ```no_run
/// use std::fs;
///
/// # fn foo() -> std::io::Result<()> {
/// try!(fs::copy("foo.txt", "bar.txt")); // Copy foo.txt to bar.txt
/// # Ok(()) }
/// ```
#[stable(feature = "rust1", since = "1.0.0")]
pub fn copy<P: AsRef<Path>, Q: AsRef<Path>>(from: P, to: Q) -> io::Result<u64> {
fs_imp::copy(from.as_ref(), to.as_ref())
}
/// Creates a new hard link on the filesystem.
///
/// The `dst` path will be a link pointing to the `src` path. Note that systems
/// often require these two paths to both be located on the same filesystem.
///
/// # Platform-specific behavior
///
/// This function currently corresponds to the `link` function on Unix
/// and the `CreateHardLink` function on Windows.
/// Note that, this [may change in the future][changes].
/// [changes]: ../io/index.html#platform-specific-behavior
///
/// # Errors
///
/// This function will return an error in the following situations, but is not
/// limited to just these cases:
///
/// * The `src` path is not a file or doesn't exist.
///
/// # Examples
///
/// ```
/// use std::fs;
///
/// # fn foo() -> std::io::Result<()> {
/// try!(fs::hard_link("a.txt", "b.txt")); // Hard link a.txt to b.txt
/// # Ok(())
/// # }
/// ```
#[stable(feature = "rust1", since = "1.0.0")]
pub fn hard_link<P: AsRef<Path>, Q: AsRef<Path>>(src: P, dst: Q) -> io::Result<()> {
fs_imp::link(src.as_ref(), dst.as_ref())
}
/// Creates a new symbolic link on the filesystem.
///
/// The `dst` path will be a symbolic link pointing to the `src` path.
/// On Windows, this will be a file symlink, not a directory symlink;
/// for this reason, the platform-specific `std::os::unix::fs::symlink`
/// and `std::os::windows::fs::{symlink_file, symlink_dir}` should be
/// used instead to make the intent explicit.
///
/// # Examples
///
/// ```
/// use std::fs;
///
/// # fn foo() -> std::io::Result<()> {
/// try!(fs::soft_link("a.txt", "b.txt"));
/// # Ok(())
/// # }
/// ```
#[stable(feature = "rust1", since = "1.0.0")]
#[rustc_deprecated(since = "1.1.0",
reason = "replaced with std::os::unix::fs::symlink and \
std::os::windows::fs::{symlink_file, symlink_dir}")]
pub fn soft_link<P: AsRef<Path>, Q: AsRef<Path>>(src: P, dst: Q) -> io::Result<()> {
fs_imp::symlink(src.as_ref(), dst.as_ref())
}
/// Reads a symbolic link, returning the file that the link points to.
///
/// # Platform-specific behavior
///
/// This function currently corresponds to the `readlink` function on Unix
/// and the `CreateFile` function with `FILE_FLAG_OPEN_REPARSE_POINT` and
/// `FILE_FLAG_BACKUP_SEMANTICS` flags on Windows.
/// Note that, this [may change in the future][changes].
/// [changes]: ../io/index.html#platform-specific-behavior
///
/// # Errors
///
/// This function will return an error in the following situations, but is not
/// limited to just these cases:
///
/// * `path` is not a symbolic link.
/// * `path` does not exist.
///
/// # Examples
///
/// ```
/// use std::fs;
///
/// # fn foo() -> std::io::Result<()> {
/// let path = try!(fs::read_link("a.txt"));
/// # Ok(())
/// # }
/// ```
#[stable(feature = "rust1", since = "1.0.0")]
pub fn read_link<P: AsRef<Path>>(path: P) -> io::Result<PathBuf> {
fs_imp::readlink(path.as_ref())
}
/// Returns the canonical form of a path with all intermediate components
/// normalized and symbolic links resolved.
///
/// # Platform-specific behavior
///
/// This function currently corresponds to the `realpath` function on Unix
/// and the `CreateFile` and `GetFinalPathNameByHandle` functions on Windows.
/// Note that, this [may change in the future][changes].
/// [changes]: ../io/index.html#platform-specific-behavior
///
/// # Errors
///
/// This function will return an error in the following situations, but is not
/// limited to just these cases:
///
/// * `path` does not exist.
/// * A component in path is not a directory.
///
/// # Examples
///
/// ```
/// use std::fs;
///
/// # fn foo() -> std::io::Result<()> {
/// let path = try!(fs::canonicalize("../a/../foo.txt"));
/// # Ok(())
/// # }
/// ```
#[stable(feature = "fs_canonicalize", since = "1.5.0")]
pub fn canonicalize<P: AsRef<Path>>(path: P) -> io::Result<PathBuf> {
fs_imp::canonicalize(path.as_ref())
}
/// Creates a new, empty directory at the provided path
///
/// # Platform-specific behavior
///
/// This function currently corresponds to the `mkdir` function on Unix
/// and the `CreateDirectory` function on Windows.
/// Note that, this [may change in the future][changes].
/// [changes]: ../io/index.html#platform-specific-behavior
///
/// # Errors
///
/// This function will return an error in the following situations, but is not
/// limited to just these cases:
///
/// * User lacks permissions to create directory at `path`.
/// * `path` already exists.
///
/// # Examples
///
/// ```
/// use std::fs;
///
/// # fn foo() -> std::io::Result<()> {
/// try!(fs::create_dir("/some/dir"));
/// # Ok(())
/// # }
/// ```
#[stable(feature = "rust1", since = "1.0.0")]
pub fn create_dir<P: AsRef<Path>>(path: P) -> io::Result<()> {
DirBuilder::new().create(path.as_ref())
}
/// Recursively create a directory and all of its parent components if they
/// are missing.
///
/// # Platform-specific behavior
///
/// This function currently corresponds to the `mkdir` function on Unix
/// and the `CreateDirectory` function on Windows.
/// Note that, this [may change in the future][changes].
/// [changes]: ../io/index.html#platform-specific-behavior
///
/// # Errors
///
/// This function will return an error in the following situations, but is not
/// limited to just these cases:
///
/// * If any directory in the path specified by `path`
/// does not already exist and it could not be created otherwise. The specific
/// error conditions for when a directory is being created (after it is
/// determined to not exist) are outlined by `fs::create_dir`.
///
/// # Examples
///
/// ```
/// use std::fs;
///
/// # fn foo() -> std::io::Result<()> {
/// try!(fs::create_dir_all("/some/dir"));
/// # Ok(())
/// # }
/// ```
#[stable(feature = "rust1", since = "1.0.0")]
pub fn create_dir_all<P: AsRef<Path>>(path: P) -> io::Result<()> {
DirBuilder::new().recursive(true).create(path.as_ref())
}
/// Removes an existing, empty directory.
///
/// # Platform-specific behavior
///
/// This function currently corresponds to the `rmdir` function on Unix
/// and the `RemoveDirectory` function on Windows.
/// Note that, this [may change in the future][changes].
/// [changes]: ../io/index.html#platform-specific-behavior
///
/// # Errors
///
/// This function will return an error in the following situations, but is not
/// limited to just these cases:
///
/// * The user lacks permissions to remove the directory at the provided `path`.
/// * The directory isn't empty.
///
/// # Examples
///
/// ```
/// use std::fs;
///
/// # fn foo() -> std::io::Result<()> {
/// try!(fs::remove_dir("/some/dir"));
/// # Ok(())
/// # }
/// ```
#[stable(feature = "rust1", since = "1.0.0")]
pub fn remove_dir<P: AsRef<Path>>(path: P) -> io::Result<()> {
fs_imp::rmdir(path.as_ref())
}
/// Removes a directory at this path, after removing all its contents. Use
/// carefully!
///
/// This function does **not** follow symbolic links and it will simply remove the
/// symbolic link itself.
///
/// # Platform-specific behavior
///
/// This function currently corresponds to `opendir`, `lstat`, `rm` and `rmdir` functions on Unix
/// and the `FindFirstFile`, `GetFileAttributesEx`, `DeleteFile`, and `RemoveDirectory` functions
/// on Windows.
/// Note that, this [may change in the future][changes].
/// [changes]: ../io/index.html#platform-specific-behavior
///
/// # Errors
///
/// See `file::remove_file` and `fs::remove_dir`.
///
/// # Examples
///
/// ```
/// use std::fs;
///
/// # fn foo() -> std::io::Result<()> {
/// try!(fs::remove_dir_all("/some/dir"));
/// # Ok(())
/// # }
/// ```
#[stable(feature = "rust1", since = "1.0.0")]
pub fn remove_dir_all<P: AsRef<Path>>(path: P) -> io::Result<()> {
_remove_dir_all(path.as_ref())
}
fn _remove_dir_all(path: &Path) -> io::Result<()> {
for child in try!(read_dir(path)) {
let child = try!(child).path();
let stat = try!(symlink_metadata(&*child));
if stat.is_dir() {
try!(remove_dir_all(&*child));
} else {
try!(remove_file(&*child));
}
}
remove_dir(path)
}
/// Returns an iterator over the entries within a directory.
///
/// The iterator will yield instances of `io::Result<DirEntry>`. New errors may
/// be encountered after an iterator is initially constructed.
///
/// # Platform-specific behavior
///
/// This function currently corresponds to the `opendir` function on Unix
/// and the `FindFirstFile` function on Windows.
/// Note that, this [may change in the future][changes].
/// [changes]: ../io/index.html#platform-specific-behavior
///
/// # Errors
///
/// This function will return an error in the following situations, but is not
/// limited to just these cases:
///
/// * The provided `path` doesn't exist.
/// * The process lacks permissions to view the contents.
/// * The `path` points at a non-directory file.
///
/// # Examples
///
/// ```
/// use std::io;
/// use std::fs::{self, DirEntry};
/// use std::path::Path;
///
/// // one possible implementation of fs::walk_dir only visiting files
/// fn visit_dirs(dir: &Path, cb: &Fn(&DirEntry)) -> io::Result<()> {
/// if try!(fs::metadata(dir)).is_dir() {
/// for entry in try!(fs::read_dir(dir)) {
/// let entry = try!(entry);
/// if try!(fs::metadata(entry.path())).is_dir() {
/// try!(visit_dirs(&entry.path(), cb));
/// } else {
/// cb(&entry);
/// }
/// }
/// }
/// Ok(())
/// }
/// ```
#[stable(feature = "rust1", since = "1.0.0")]
pub fn read_dir<P: AsRef<Path>>(path: P) -> io::Result<ReadDir> {
fs_imp::readdir(path.as_ref()).map(ReadDir)
}
/// Returns an iterator that will recursively walk the directory structure
/// rooted at `path`.
///
/// The path given will not be iterated over, and this will perform iteration in
/// some top-down order. The contents of unreadable subdirectories are ignored.
///
/// The iterator will yield instances of `io::Result<DirEntry>`. New errors may
/// be encountered after an iterator is initially constructed.
#[unstable(feature = "fs_walk",
reason = "the precise semantics and defaults for a recursive walk \
may change and this may end up accounting for files such \
as symlinks differently",
issue = "27707")]
#[rustc_deprecated(reason = "superceded by the walkdir crate",
since = "1.6.0")]
#[allow(deprecated)]
pub fn walk_dir<P: AsRef<Path>>(path: P) -> io::Result<WalkDir> {
_walk_dir(path.as_ref())
}
#[allow(deprecated)]
fn _walk_dir(path: &Path) -> io::Result<WalkDir> {
let start = try!(read_dir(path));
Ok(WalkDir { cur: Some(start), stack: Vec::new() })
}
#[unstable(feature = "fs_walk", issue = "27707")]
#[rustc_deprecated(reason = "superceded by the walkdir crate",
since = "1.6.0")]
#[allow(deprecated)]
impl Iterator for WalkDir {
type Item = io::Result<DirEntry>;
fn next(&mut self) -> Option<io::Result<DirEntry>> {
loop {
if let Some(ref mut cur) = self.cur {
match cur.next() {
Some(Err(e)) => return Some(Err(e)),
Some(Ok(next)) => {
let path = next.path();
if path.is_dir() {
self.stack.push(read_dir(&*path));
}
return Some(Ok(next))
}
None => {}
}
}
self.cur = None;
match self.stack.pop() {
Some(Err(e)) => return Some(Err(e)),
Some(Ok(next)) => self.cur = Some(next),
None => return None,
}
}
}
}
/// Changes the permissions found on a file or a directory.
///
/// # Platform-specific behavior
///
/// This function currently corresponds to the `chmod` function on Unix
/// and the `SetFileAttributes` function on Windows.
/// Note that, this [may change in the future][changes].
/// [changes]: ../io/index.html#platform-specific-behavior
///
/// # Errors
///
/// This function will return an error in the following situations, but is not
/// limited to just these cases:
///
/// * `path` does not exist.
/// * The user lacks the permission to change attributes of the file.
///
/// # Examples
///
/// ```
/// # fn foo() -> std::io::Result<()> {
/// use std::fs;
///
/// let mut perms = try!(fs::metadata("foo.txt")).permissions();
/// perms.set_readonly(true);
/// try!(fs::set_permissions("foo.txt", perms));
/// # Ok(())
/// # }
/// ```
#[stable(feature = "set_permissions", since = "1.1.0")]
pub fn set_permissions<P: AsRef<Path>>(path: P, perm: Permissions)
-> io::Result<()> {
fs_imp::set_perm(path.as_ref(), perm.0)
}
impl DirBuilder {
/// Creates a new set of options with default mode/security settings for all
/// platforms and also non-recursive.
#[stable(feature = "dir_builder", since = "1.6.0")]
pub fn new() -> DirBuilder {
DirBuilder {
inner: fs_imp::DirBuilder::new(),
recursive: false,
}
}
/// Indicate that directories create should be created recursively, creating
/// all parent directories if they do not exist with the same security and
/// permissions settings.
///
/// This option defaults to `false`
#[stable(feature = "dir_builder", since = "1.6.0")]
pub fn recursive(&mut self, recursive: bool) -> &mut Self {
self.recursive = recursive;
self
}
/// Create the specified directory with the options configured in this
/// builder.
///
/// # Examples
///
/// ```no_run
/// use std::fs::{self, DirBuilder};
///
/// let path = "/tmp/foo/bar/baz";
/// DirBuilder::new()
/// .recursive(true)
/// .create(path).unwrap();
///
/// assert!(fs::metadata(path).unwrap().is_dir());
/// ```
#[stable(feature = "dir_builder", since = "1.6.0")]
pub fn create<P: AsRef<Path>>(&self, path: P) -> io::Result<()> {
self._create(path.as_ref())
}
fn _create(&self, path: &Path) -> io::Result<()> {
if self.recursive {
self.create_dir_all(path)
} else {
self.inner.mkdir(path)
}
}
fn create_dir_all(&self, path: &Path) -> io::Result<()> {
if path == Path::new("") || path.is_dir() { return Ok(()) }
if let Some(p) = path.parent() {
try!(self.create_dir_all(p))
}
self.inner.mkdir(path)
}
}
impl AsInnerMut<fs_imp::DirBuilder> for DirBuilder {
fn as_inner_mut(&mut self) -> &mut fs_imp::DirBuilder {
&mut self.inner
}
}
#[cfg(test)]
mod tests {
#![allow(deprecated)] //rand
use prelude::v1::*;
use io::prelude::*;
use env;
use fs::{self, File, OpenOptions};
use io::{ErrorKind, SeekFrom};
use path::PathBuf;
use path::Path as Path2;
use rand::{self, StdRng, Rng};
use str;
macro_rules! check { ($e:expr) => (
match $e {
Ok(t) => t,
Err(e) => panic!("{} failed with: {}", stringify!($e), e),
}
) }
macro_rules! error { ($e:expr, $s:expr) => (
match $e {
Ok(_) => panic!("Unexpected success. Should've been: {:?}", $s),
Err(ref err) => assert!(err.to_string().contains($s),
format!("`{}` did not contain `{}`", err, $s))
}
) }
pub struct TempDir(PathBuf);
impl TempDir {
fn join(&self, path: &str) -> PathBuf {
let TempDir(ref p) = *self;
p.join(path)
}
fn path<'a>(&'a self) -> &'a Path2 {
let TempDir(ref p) = *self;
p
}
}
impl Drop for TempDir {
fn drop(&mut self) {
// Gee, seeing how we're testing the fs module I sure hope that we
// at least implement this correctly!
let TempDir(ref p) = *self;
check!(fs::remove_dir_all(p));
}
}
pub fn tmpdir() -> TempDir {
let p = env::temp_dir();
let mut r = rand::thread_rng();
let ret = p.join(&format!("rust-{}", r.next_u32()));
check!(fs::create_dir(&ret));
TempDir(ret)
}
#[test]
fn file_test_io_smoke_test() {
let message = "it's alright. have a good time";
let tmpdir = tmpdir();
let filename = &tmpdir.join("file_rt_io_file_test.txt");
{
let mut write_stream = check!(File::create(filename));
check!(write_stream.write(message.as_bytes()));
}
{
let mut read_stream = check!(File::open(filename));
let mut read_buf = [0; 1028];
let read_str = match check!(read_stream.read(&mut read_buf)) {
0 => panic!("shouldn't happen"),
n => str::from_utf8(&read_buf[..n]).unwrap().to_string()
};
assert_eq!(read_str, message);
}
check!(fs::remove_file(filename));
}
#[test]
fn invalid_path_raises() {
let tmpdir = tmpdir();
let filename = &tmpdir.join("file_that_does_not_exist.txt");
let result = File::open(filename);
if cfg!(unix) {
error!(result, "o such file or directory");
}
// error!(result, "couldn't open path as file");
// error!(result, format!("path={}; mode=open; access=read", filename.display()));
}
#[test]
fn file_test_iounlinking_invalid_path_should_raise_condition() {
let tmpdir = tmpdir();
let filename = &tmpdir.join("file_another_file_that_does_not_exist.txt");
let result = fs::remove_file(filename);
if cfg!(unix) {
error!(result, "o such file or directory");
}
// error!(result, "couldn't unlink path");
// error!(result, format!("path={}", filename.display()));
}
#[test]
fn file_test_io_non_positional_read() {
let message: &str = "ten-four";
let mut read_mem = [0; 8];
let tmpdir = tmpdir();
let filename = &tmpdir.join("file_rt_io_file_test_positional.txt");
{
let mut rw_stream = check!(File::create(filename));
check!(rw_stream.write(message.as_bytes()));
}
{
let mut read_stream = check!(File::open(filename));
{
let read_buf = &mut read_mem[0..4];
check!(read_stream.read(read_buf));
}
{
let read_buf = &mut read_mem[4..8];
check!(read_stream.read(read_buf));
}
}
check!(fs::remove_file(filename));
let read_str = str::from_utf8(&read_mem).unwrap();
assert_eq!(read_str, message);
}
#[test]
fn file_test_io_seek_and_tell_smoke_test() {
let message = "ten-four";
let mut read_mem = [0; 4];
let set_cursor = 4 as u64;
let tell_pos_pre_read;
let tell_pos_post_read;
let tmpdir = tmpdir();
let filename = &tmpdir.join("file_rt_io_file_test_seeking.txt");
{
let mut rw_stream = check!(File::create(filename));
check!(rw_stream.write(message.as_bytes()));
}
{
let mut read_stream = check!(File::open(filename));
check!(read_stream.seek(SeekFrom::Start(set_cursor)));
tell_pos_pre_read = check!(read_stream.seek(SeekFrom::Current(0)));
check!(read_stream.read(&mut read_mem));
tell_pos_post_read = check!(read_stream.seek(SeekFrom::Current(0)));
}
check!(fs::remove_file(filename));
let read_str = str::from_utf8(&read_mem).unwrap();
assert_eq!(read_str, &message[4..8]);
assert_eq!(tell_pos_pre_read, set_cursor);
assert_eq!(tell_pos_post_read, message.len() as u64);
}
#[test]
fn file_test_io_seek_and_write() {
let initial_msg = "food-is-yummy";
let overwrite_msg = "-the-bar!!";
let final_msg = "foo-the-bar!!";
let seek_idx = 3;
let mut read_mem = [0; 13];
let tmpdir = tmpdir();
let filename = &tmpdir.join("file_rt_io_file_test_seek_and_write.txt");
{
let mut rw_stream = check!(File::create(filename));
check!(rw_stream.write(initial_msg.as_bytes()));
check!(rw_stream.seek(SeekFrom::Start(seek_idx)));
check!(rw_stream.write(overwrite_msg.as_bytes()));
}
{
let mut read_stream = check!(File::open(filename));
check!(read_stream.read(&mut read_mem));
}
check!(fs::remove_file(filename));
let read_str = str::from_utf8(&read_mem).unwrap();
assert!(read_str == final_msg);
}
#[test]
fn file_test_io_seek_shakedown() {
// 01234567890123
let initial_msg = "qwer-asdf-zxcv";
let chunk_one: &str = "qwer";
let chunk_two: &str = "asdf";
let chunk_three: &str = "zxcv";
let mut read_mem = [0; 4];
let tmpdir = tmpdir();
let filename = &tmpdir.join("file_rt_io_file_test_seek_shakedown.txt");
{
let mut rw_stream = check!(File::create(filename));
check!(rw_stream.write(initial_msg.as_bytes()));
}
{
let mut read_stream = check!(File::open(filename));
check!(read_stream.seek(SeekFrom::End(-4)));
check!(read_stream.read(&mut read_mem));
assert_eq!(str::from_utf8(&read_mem).unwrap(), chunk_three);
check!(read_stream.seek(SeekFrom::Current(-9)));
check!(read_stream.read(&mut read_mem));
assert_eq!(str::from_utf8(&read_mem).unwrap(), chunk_two);
check!(read_stream.seek(SeekFrom::Start(0)));
check!(read_stream.read(&mut read_mem));
assert_eq!(str::from_utf8(&read_mem).unwrap(), chunk_one);
}
check!(fs::remove_file(filename));
}
#[test]
fn file_test_stat_is_correct_on_is_file() {
let tmpdir = tmpdir();
let filename = &tmpdir.join("file_stat_correct_on_is_file.txt");
{
let mut opts = OpenOptions::new();
let mut fs = check!(opts.read(true).write(true)
.create(true).open(filename));
let msg = "hw";
fs.write(msg.as_bytes()).unwrap();
let fstat_res = check!(fs.metadata());
assert!(fstat_res.is_file());
}
let stat_res_fn = check!(fs::metadata(filename));
assert!(stat_res_fn.is_file());
let stat_res_meth = check!(filename.metadata());
assert!(stat_res_meth.is_file());
check!(fs::remove_file(filename));
}
#[test]
fn file_test_stat_is_correct_on_is_dir() {
let tmpdir = tmpdir();
let filename = &tmpdir.join("file_stat_correct_on_is_dir");
check!(fs::create_dir(filename));
let stat_res_fn = check!(fs::metadata(filename));
assert!(stat_res_fn.is_dir());
let stat_res_meth = check!(filename.metadata());
assert!(stat_res_meth.is_dir());
check!(fs::remove_dir(filename));
}
#[test]
fn file_test_fileinfo_false_when_checking_is_file_on_a_directory() {
let tmpdir = tmpdir();
let dir = &tmpdir.join("fileinfo_false_on_dir");
check!(fs::create_dir(dir));
assert!(dir.is_file() == false);
check!(fs::remove_dir(dir));
}
#[test]
fn file_test_fileinfo_check_exists_before_and_after_file_creation() {
let tmpdir = tmpdir();
let file = &tmpdir.join("fileinfo_check_exists_b_and_a.txt");
check!(check!(File::create(file)).write(b"foo"));
assert!(file.exists());
check!(fs::remove_file(file));
assert!(!file.exists());
}
#[test]
fn file_test_directoryinfo_check_exists_before_and_after_mkdir() {
let tmpdir = tmpdir();
let dir = &tmpdir.join("before_and_after_dir");
assert!(!dir.exists());
check!(fs::create_dir(dir));
assert!(dir.exists());
assert!(dir.is_dir());
check!(fs::remove_dir(dir));
assert!(!dir.exists());
}
#[test]
fn file_test_directoryinfo_readdir() {
let tmpdir = tmpdir();
let dir = &tmpdir.join("di_readdir");
check!(fs::create_dir(dir));
let prefix = "foo";
for n in 0..3 {
let f = dir.join(&format!("{}.txt", n));
let mut w = check!(File::create(&f));
let msg_str = format!("{}{}", prefix, n.to_string());
let msg = msg_str.as_bytes();
check!(w.write(msg));
}
let files = check!(fs::read_dir(dir));
let mut mem = [0; 4];
for f in files {
let f = f.unwrap().path();
{
let n = f.file_stem().unwrap();
check!(check!(File::open(&f)).read(&mut mem));
let read_str = str::from_utf8(&mem).unwrap();
let expected = format!("{}{}", prefix, n.to_str().unwrap());
assert_eq!(expected, read_str);
}
check!(fs::remove_file(&f));
}
check!(fs::remove_dir(dir));
}
#[test]
fn file_test_walk_dir() {
let tmpdir = tmpdir();
let dir = &tmpdir.join("walk_dir");
check!(fs::create_dir(dir));
let dir1 = &dir.join("01/02/03");
check!(fs::create_dir_all(dir1));
check!(File::create(&dir1.join("04")));
let dir2 = &dir.join("11/12/13");
check!(fs::create_dir_all(dir2));
check!(File::create(&dir2.join("14")));
let files = check!(fs::walk_dir(dir));
let mut cur = [0; 2];
for f in files {
let f = f.unwrap().path();
let stem = f.file_stem().unwrap().to_str().unwrap();
let root = stem.as_bytes()[0] - b'0';
let name = stem.as_bytes()[1] - b'0';
assert!(cur[root as usize] < name);
cur[root as usize] = name;
}
check!(fs::remove_dir_all(dir));
}
#[test]
fn mkdir_path_already_exists_error() {
let tmpdir = tmpdir();
let dir = &tmpdir.join("mkdir_error_twice");
check!(fs::create_dir(dir));
let e = fs::create_dir(dir).err().unwrap();
assert_eq!(e.kind(), ErrorKind::AlreadyExists);
}
#[test]
fn recursive_mkdir() {
let tmpdir = tmpdir();
let dir = tmpdir.join("d1/d2");
check!(fs::create_dir_all(&dir));
assert!(dir.is_dir())
}
#[test]
fn recursive_mkdir_failure() {
let tmpdir = tmpdir();
let dir = tmpdir.join("d1");
let file = dir.join("f1");
check!(fs::create_dir_all(&dir));
check!(File::create(&file));
let result = fs::create_dir_all(&file);
assert!(result.is_err());
// error!(result, "couldn't recursively mkdir");
// error!(result, "couldn't create directory");
// error!(result, "mode=0700");
// error!(result, format!("path={}", file.display()));
}
#[test]
fn recursive_mkdir_slash() {
check!(fs::create_dir_all(&Path2::new("/")));
}
// FIXME(#12795) depends on lstat to work on windows
#[cfg(not(windows))]
#[test]
fn recursive_rmdir() {
let tmpdir = tmpdir();
let d1 = tmpdir.join("d1");
let dt = d1.join("t");
let dtt = dt.join("t");
let d2 = tmpdir.join("d2");
let canary = d2.join("do_not_delete");
check!(fs::create_dir_all(&dtt));
check!(fs::create_dir_all(&d2));
check!(check!(File::create(&canary)).write(b"foo"));
check!(fs::soft_link(&d2, &dt.join("d2")));
check!(fs::remove_dir_all(&d1));
assert!(!d1.is_dir());
assert!(canary.exists());
}
#[test]
fn unicode_path_is_dir() {
assert!(Path2::new(".").is_dir());
assert!(!Path2::new("test/stdtest/fs.rs").is_dir());
let tmpdir = tmpdir();
let mut dirpath = tmpdir.path().to_path_buf();
dirpath.push("test-가一ー你好");
check!(fs::create_dir(&dirpath));
assert!(dirpath.is_dir());
let mut filepath = dirpath;
filepath.push("unicode-file-\u{ac00}\u{4e00}\u{30fc}\u{4f60}\u{597d}.rs");
check!(File::create(&filepath)); // ignore return; touch only
assert!(!filepath.is_dir());
assert!(filepath.exists());
}
#[test]
fn unicode_path_exists() {
assert!(Path2::new(".").exists());
assert!(!Path2::new("test/nonexistent-bogus-path").exists());
let tmpdir = tmpdir();
let unicode = tmpdir.path();
let unicode = unicode.join(&format!("test-각丁ー再见"));
check!(fs::create_dir(&unicode));
assert!(unicode.exists());
assert!(!Path2::new("test/unicode-bogus-path-각丁ー再见").exists());
}
#[test]
fn copy_file_does_not_exist() {
let from = Path2::new("test/nonexistent-bogus-path");
let to = Path2::new("test/other-bogus-path");
match fs::copy(&from, &to) {
Ok(..) => panic!(),
Err(..) => {
assert!(!from.exists());
assert!(!to.exists());
}
}
}
#[test]
fn copy_src_does_not_exist() {
let tmpdir = tmpdir();
let from = Path2::new("test/nonexistent-bogus-path");
let to = tmpdir.join("out.txt");
check!(check!(File::create(&to)).write(b"hello"));
assert!(fs::copy(&from, &to).is_err());
assert!(!from.exists());
let mut v = Vec::new();
check!(check!(File::open(&to)).read_to_end(&mut v));
assert_eq!(v, b"hello");
}
#[test]
fn copy_file_ok() {
let tmpdir = tmpdir();
let input = tmpdir.join("in.txt");
let out = tmpdir.join("out.txt");
check!(check!(File::create(&input)).write(b"hello"));
check!(fs::copy(&input, &out));
let mut v = Vec::new();
check!(check!(File::open(&out)).read_to_end(&mut v));
assert_eq!(v, b"hello");
assert_eq!(check!(input.metadata()).permissions(),
check!(out.metadata()).permissions());
}
#[test]
fn copy_file_dst_dir() {
let tmpdir = tmpdir();
let out = tmpdir.join("out");
check!(File::create(&out));
match fs::copy(&*out, tmpdir.path()) {
Ok(..) => panic!(), Err(..) => {}
}
}
#[test]
fn copy_file_dst_exists() {
let tmpdir = tmpdir();
let input = tmpdir.join("in");
let output = tmpdir.join("out");
check!(check!(File::create(&input)).write("foo".as_bytes()));
check!(check!(File::create(&output)).write("bar".as_bytes()));
check!(fs::copy(&input, &output));
let mut v = Vec::new();
check!(check!(File::open(&output)).read_to_end(&mut v));
assert_eq!(v, b"foo".to_vec());
}
#[test]
fn copy_file_src_dir() {
let tmpdir = tmpdir();
let out = tmpdir.join("out");
match fs::copy(tmpdir.path(), &out) {
Ok(..) => panic!(), Err(..) => {}
}
assert!(!out.exists());
}
#[test]
fn copy_file_preserves_perm_bits() {
let tmpdir = tmpdir();
let input = tmpdir.join("in.txt");
let out = tmpdir.join("out.txt");
let attr = check!(check!(File::create(&input)).metadata());
let mut p = attr.permissions();
p.set_readonly(true);
check!(fs::set_permissions(&input, p));
check!(fs::copy(&input, &out));
assert!(check!(out.metadata()).permissions().readonly());
check!(fs::set_permissions(&input, attr.permissions()));
check!(fs::set_permissions(&out, attr.permissions()));
}
#[cfg(windows)]
#[test]
fn copy_file_preserves_streams() {
let tmp = tmpdir();
check!(check!(File::create(tmp.join("in.txt:bunny"))).write("carrot".as_bytes()));
assert_eq!(check!(fs::copy(tmp.join("in.txt"), tmp.join("out.txt"))), 6);
assert_eq!(check!(tmp.join("out.txt").metadata()).len(), 0);
let mut v = Vec::new();
check!(check!(File::open(tmp.join("out.txt:bunny"))).read_to_end(&mut v));
assert_eq!(v, b"carrot".to_vec());
}
#[cfg(not(windows))] // FIXME(#10264) operation not permitted?
#[test]
fn symlinks_work() {
let tmpdir = tmpdir();
let input = tmpdir.join("in.txt");
let out = tmpdir.join("out.txt");
check!(check!(File::create(&input)).write("foobar".as_bytes()));
check!(fs::soft_link(&input, &out));
// if cfg!(not(windows)) {
// assert_eq!(check!(lstat(&out)).kind, FileType::Symlink);
// assert_eq!(check!(out.lstat()).kind, FileType::Symlink);
// }
assert_eq!(check!(fs::metadata(&out)).len(),
check!(fs::metadata(&input)).len());
let mut v = Vec::new();
check!(check!(File::open(&out)).read_to_end(&mut v));
assert_eq!(v, b"foobar".to_vec());
}
#[cfg(not(windows))] // apparently windows doesn't like symlinks
#[test]
fn symlink_noexist() {
let tmpdir = tmpdir();
// symlinks can point to things that don't exist
check!(fs::soft_link(&tmpdir.join("foo"), &tmpdir.join("bar")));
assert_eq!(check!(fs::read_link(&tmpdir.join("bar"))),
tmpdir.join("foo"));
}
#[test]
fn readlink_not_symlink() {
let tmpdir = tmpdir();
match fs::read_link(tmpdir.path()) {
Ok(..) => panic!("wanted a failure"),
Err(..) => {}
}
}
#[test]
fn links_work() {
let tmpdir = tmpdir();
let input = tmpdir.join("in.txt");
let out = tmpdir.join("out.txt");
check!(check!(File::create(&input)).write("foobar".as_bytes()));
check!(fs::hard_link(&input, &out));
assert_eq!(check!(fs::metadata(&out)).len(),
check!(fs::metadata(&input)).len());
assert_eq!(check!(fs::metadata(&out)).len(),
check!(input.metadata()).len());
let mut v = Vec::new();
check!(check!(File::open(&out)).read_to_end(&mut v));
assert_eq!(v, b"foobar".to_vec());
// can't link to yourself
match fs::hard_link(&input, &input) {
Ok(..) => panic!("wanted a failure"),
Err(..) => {}
}
// can't link to something that doesn't exist
match fs::hard_link(&tmpdir.join("foo"), &tmpdir.join("bar")) {
Ok(..) => panic!("wanted a failure"),
Err(..) => {}
}
}
#[test]
fn chmod_works() {
let tmpdir = tmpdir();
let file = tmpdir.join("in.txt");
check!(File::create(&file));
let attr = check!(fs::metadata(&file));
assert!(!attr.permissions().readonly());
let mut p = attr.permissions();
p.set_readonly(true);
check!(fs::set_permissions(&file, p.clone()));
let attr = check!(fs::metadata(&file));
assert!(attr.permissions().readonly());
match fs::set_permissions(&tmpdir.join("foo"), p.clone()) {
Ok(..) => panic!("wanted an error"),
Err(..) => {}
}
p.set_readonly(false);
check!(fs::set_permissions(&file, p));
}
#[test]
fn sync_doesnt_kill_anything() {
let tmpdir = tmpdir();
let path = tmpdir.join("in.txt");
let mut file = check!(File::create(&path));
check!(file.sync_all());
check!(file.sync_data());
check!(file.write(b"foo"));
check!(file.sync_all());
check!(file.sync_data());
}
#[test]
fn truncate_works() {
let tmpdir = tmpdir();
let path = tmpdir.join("in.txt");
let mut file = check!(File::create(&path));
check!(file.write(b"foo"));
check!(file.sync_all());
// Do some simple things with truncation
assert_eq!(check!(file.metadata()).len(), 3);
check!(file.set_len(10));
assert_eq!(check!(file.metadata()).len(), 10);
check!(file.write(b"bar"));
check!(file.sync_all());
assert_eq!(check!(file.metadata()).len(), 10);
let mut v = Vec::new();
check!(check!(File::open(&path)).read_to_end(&mut v));
assert_eq!(v, b"foobar\0\0\0\0".to_vec());
// Truncate to a smaller length, don't seek, and then write something.
// Ensure that the intermediate zeroes are all filled in (we have `seek`ed
// past the end of the file).
check!(file.set_len(2));
assert_eq!(check!(file.metadata()).len(), 2);
check!(file.write(b"wut"));
check!(file.sync_all());
assert_eq!(check!(file.metadata()).len(), 9);
let mut v = Vec::new();
check!(check!(File::open(&path)).read_to_end(&mut v));
assert_eq!(v, b"fo\0\0\0\0wut".to_vec());
}
#[test]
fn open_flavors() {
use fs::OpenOptions as OO;
fn c<T: Clone>(t: &T) -> T { t.clone() }
let tmpdir = tmpdir();
let mut r = OO::new(); r.read(true);
let mut w = OO::new(); w.write(true);
let mut rw = OO::new(); rw.write(true).read(true);
match r.open(&tmpdir.join("a")) {
Ok(..) => panic!(), Err(..) => {}
}
// Perform each one twice to make sure that it succeeds the second time
// (where the file exists)
check!(c(&w).create(true).open(&tmpdir.join("b")));
assert!(tmpdir.join("b").exists());
check!(c(&w).create(true).open(&tmpdir.join("b")));
check!(w.open(&tmpdir.join("b")));
check!(c(&rw).create(true).open(&tmpdir.join("c")));
assert!(tmpdir.join("c").exists());
check!(c(&rw).create(true).open(&tmpdir.join("c")));
check!(rw.open(&tmpdir.join("c")));
check!(c(&w).append(true).create(true).open(&tmpdir.join("d")));
assert!(tmpdir.join("d").exists());
check!(c(&w).append(true).create(true).open(&tmpdir.join("d")));
check!(c(&w).append(true).open(&tmpdir.join("d")));
check!(c(&rw).append(true).create(true).open(&tmpdir.join("e")));
assert!(tmpdir.join("e").exists());
check!(c(&rw).append(true).create(true).open(&tmpdir.join("e")));
check!(c(&rw).append(true).open(&tmpdir.join("e")));
check!(c(&w).truncate(true).create(true).open(&tmpdir.join("f")));
assert!(tmpdir.join("f").exists());
check!(c(&w).truncate(true).create(true).open(&tmpdir.join("f")));
check!(c(&w).truncate(true).open(&tmpdir.join("f")));
check!(c(&rw).truncate(true).create(true).open(&tmpdir.join("g")));
assert!(tmpdir.join("g").exists());
check!(c(&rw).truncate(true).create(true).open(&tmpdir.join("g")));
check!(c(&rw).truncate(true).open(&tmpdir.join("g")));
check!(check!(File::create(&tmpdir.join("h"))).write("foo".as_bytes()));
check!(r.open(&tmpdir.join("h")));
{
let mut f = check!(r.open(&tmpdir.join("h")));
assert!(f.write("wut".as_bytes()).is_err());
}
assert_eq!(check!(fs::metadata(&tmpdir.join("h"))).len(), 3);
{
let mut f = check!(c(&w).append(true).open(&tmpdir.join("h")));
check!(f.write("bar".as_bytes()));
}
assert_eq!(check!(fs::metadata(&tmpdir.join("h"))).len(), 6);
{
let mut f = check!(c(&w).truncate(true).open(&tmpdir.join("h")));
check!(f.write("bar".as_bytes()));
}
assert_eq!(check!(fs::metadata(&tmpdir.join("h"))).len(), 3);
}
#[test]
fn binary_file() {
let mut bytes = [0; 1024];
StdRng::new().unwrap().fill_bytes(&mut bytes);
let tmpdir = tmpdir();
check!(check!(File::create(&tmpdir.join("test"))).write(&bytes));
let mut v = Vec::new();
check!(check!(File::open(&tmpdir.join("test"))).read_to_end(&mut v));
assert!(v == &bytes[..]);
}
#[test]
#[cfg(not(windows))]
fn unlink_readonly() {
let tmpdir = tmpdir();
let path = tmpdir.join("file");
check!(File::create(&path));
let mut perm = check!(fs::metadata(&path)).permissions();
perm.set_readonly(true);
check!(fs::set_permissions(&path, perm));
check!(fs::remove_file(&path));
}
#[test]
fn mkdir_trailing_slash() {
let tmpdir = tmpdir();
let path = tmpdir.join("file");
check!(fs::create_dir_all(&path.join("a/")));
}
#[test]
fn canonicalize_works_simple() {
let tmpdir = tmpdir();
let tmpdir = fs::canonicalize(tmpdir.path()).unwrap();
let file = tmpdir.join("test");
File::create(&file).unwrap();
assert_eq!(fs::canonicalize(&file).unwrap(), file);
}
#[test]
#[cfg(not(windows))]
fn realpath_works() {
let tmpdir = tmpdir();
let tmpdir = fs::canonicalize(tmpdir.path()).unwrap();
let file = tmpdir.join("test");
let dir = tmpdir.join("test2");
let link = dir.join("link");
let linkdir = tmpdir.join("test3");
File::create(&file).unwrap();
fs::create_dir(&dir).unwrap();
fs::soft_link(&file, &link).unwrap();
fs::soft_link(&dir, &linkdir).unwrap();
assert!(link.symlink_metadata().unwrap().file_type().is_symlink());
assert_eq!(fs::canonicalize(&tmpdir).unwrap(), tmpdir);
assert_eq!(fs::canonicalize(&file).unwrap(), file);
assert_eq!(fs::canonicalize(&link).unwrap(), file);
assert_eq!(fs::canonicalize(&linkdir).unwrap(), dir);
assert_eq!(fs::canonicalize(&linkdir.join("link")).unwrap(), file);
}
#[test]
#[cfg(not(windows))]
fn realpath_works_tricky() {
let tmpdir = tmpdir();
let tmpdir = fs::canonicalize(tmpdir.path()).unwrap();
let a = tmpdir.join("a");
let b = a.join("b");
let c = b.join("c");
let d = a.join("d");
let e = d.join("e");
let f = a.join("f");
fs::create_dir_all(&b).unwrap();
fs::create_dir_all(&d).unwrap();
File::create(&f).unwrap();
fs::soft_link("../d/e", &c).unwrap();
fs::soft_link("../f", &e).unwrap();
assert_eq!(fs::canonicalize(&c).unwrap(), f);
assert_eq!(fs::canonicalize(&e).unwrap(), f);
}
#[test]
fn dir_entry_methods() {
let tmpdir = tmpdir();
fs::create_dir_all(&tmpdir.join("a")).unwrap();
File::create(&tmpdir.join("b")).unwrap();
for file in tmpdir.path().read_dir().unwrap().map(|f| f.unwrap()) {
let fname = file.file_name();
match fname.to_str() {
Some("a") => {
assert!(file.file_type().unwrap().is_dir());
assert!(file.metadata().unwrap().is_dir());
}
Some("b") => {
assert!(file.file_type().unwrap().is_file());
assert!(file.metadata().unwrap().is_file());
}
f => panic!("unknown file name: {:?}", f),
}
}
}
#[test]
fn read_dir_not_found() {
let res = fs::read_dir("/path/that/does/not/exist");
assert_eq!(res.err().unwrap().kind(), ErrorKind::NotFound);
}
}