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use std::env;
use std::error;
use std::ffi::OsStr;
use std::fmt;
use std::fs::{self, File, OpenOptions};
use std::io::{self, Read, Seek, SeekFrom, Write};
use std::mem;
use std::ops::Deref;
#[cfg(unix)]
use std::os::unix::io::{AsFd, AsRawFd, BorrowedFd, RawFd};
#[cfg(target_os = "wasi")]
use std::os::wasi::io::{AsFd, AsRawFd, BorrowedFd, RawFd};
#[cfg(windows)]
use std::os::windows::io::{AsHandle, AsRawHandle, BorrowedHandle, RawHandle};
use std::path::{Path, PathBuf};
use crate::error::IoResultExt;
use crate::Builder;
mod imp;
/// Create a new temporary file.
///
/// The file will be created in the location returned by [`std::env::temp_dir()`].
///
/// # Security
///
/// This variant is secure/reliable in the presence of a pathological temporary file cleaner.
///
/// # Resource Leaking
///
/// The temporary file will be automatically removed by the OS when the last handle to it is closed.
/// This doesn't rely on Rust destructors being run, so will (almost) never fail to clean up the temporary file.
///
/// # Errors
///
/// If the file can not be created, `Err` is returned.
///
/// # Examples
///
/// ```
/// use tempfile::tempfile;
/// use std::io::{self, Write};
///
/// # fn main() {
/// # if let Err(_) = run() {
/// # ::std::process::exit(1);
/// # }
/// # }
/// # fn run() -> Result<(), io::Error> {
/// // Create a file inside of `std::env::temp_dir()`.
/// let mut file = tempfile()?;
///
/// writeln!(file, "Brian was here. Briefly.")?;
/// # Ok(())
/// # }
/// ```
///
pub fn tempfile() -> io::Result<File> {
tempfile_in(env::temp_dir())
}
/// Create a new temporary file in the specified directory.
///
/// # Security
///
/// This variant is secure/reliable in the presence of a pathological temporary file cleaner.
/// If the temporary file isn't created in [`std::env::temp_dir()`] then temporary file cleaners aren't an issue.
///
/// # Resource Leaking
///
/// The temporary file will be automatically removed by the OS when the last handle to it is closed.
/// This doesn't rely on Rust destructors being run, so will (almost) never fail to clean up the temporary file.
///
/// # Errors
///
/// If the file can not be created, `Err` is returned.
///
/// # Examples
///
/// ```
/// use tempfile::tempfile_in;
/// use std::io::{self, Write};
///
/// # fn main() {
/// # if let Err(_) = run() {
/// # ::std::process::exit(1);
/// # }
/// # }
/// # fn run() -> Result<(), io::Error> {
/// // Create a file inside of the current working directory
/// let mut file = tempfile_in("./")?;
///
/// writeln!(file, "Brian was here. Briefly.")?;
/// # Ok(())
/// # }
/// ```
///
pub fn tempfile_in<P: AsRef<Path>>(dir: P) -> io::Result<File> {
imp::create(dir.as_ref())
}
/// Error returned when persisting a temporary file path fails.
#[derive(Debug)]
pub struct PathPersistError {
/// The underlying IO error.
pub error: io::Error,
/// The temporary file path that couldn't be persisted.
pub path: TempPath,
}
impl From<PathPersistError> for io::Error {
#[inline]
fn from(error: PathPersistError) -> io::Error {
error.error
}
}
impl From<PathPersistError> for TempPath {
#[inline]
fn from(error: PathPersistError) -> TempPath {
error.path
}
}
impl fmt::Display for PathPersistError {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "failed to persist temporary file path: {}", self.error)
}
}
impl error::Error for PathPersistError {
fn source(&self) -> Option<&(dyn error::Error + 'static)> {
Some(&self.error)
}
}
/// A path to a named temporary file without an open file handle.
///
/// This is useful when the temporary file needs to be used by a child process,
/// for example.
///
/// When dropped, the temporary file is deleted.
pub struct TempPath {
path: Box<Path>,
}
impl TempPath {
/// Close and remove the temporary file.
///
/// Use this if you want to detect errors in deleting the file.
///
/// # Errors
///
/// If the file cannot be deleted, `Err` is returned.
///
/// # Examples
///
/// ```no_run
/// # use std::io;
/// use tempfile::NamedTempFile;
///
/// # fn main() {
/// # if let Err(_) = run() {
/// # ::std::process::exit(1);
/// # }
/// # }
/// # fn run() -> Result<(), io::Error> {
/// let file = NamedTempFile::new()?;
///
/// // Close the file, but keep the path to it around.
/// let path = file.into_temp_path();
///
/// // By closing the `TempPath` explicitly, we can check that it has
/// // been deleted successfully. If we don't close it explicitly, the
/// // file will still be deleted when `file` goes out of scope, but we
/// // won't know whether deleting the file succeeded.
/// path.close()?;
/// # Ok(())
/// # }
/// ```
pub fn close(mut self) -> io::Result<()> {
let result = fs::remove_file(&self.path).with_err_path(|| &*self.path);
self.path = PathBuf::new().into_boxed_path();
mem::forget(self);
result
}
/// Persist the temporary file at the target path.
///
/// If a file exists at the target path, persist will atomically replace it.
/// If this method fails, it will return `self` in the resulting
/// [`PathPersistError`].
///
/// Note: Temporary files cannot be persisted across filesystems. Also
/// neither the file contents nor the containing directory are
/// synchronized, so the update may not yet have reached the disk when
/// `persist` returns.
///
/// # Security
///
/// Only use this method if you're positive that a temporary file cleaner
/// won't have deleted your file. Otherwise, you might end up persisting an
/// attacker controlled file.
///
/// # Errors
///
/// If the file cannot be moved to the new location, `Err` is returned.
///
/// # Examples
///
/// ```no_run
/// # use std::io::{self, Write};
/// use tempfile::NamedTempFile;
///
/// # fn main() {
/// # if let Err(_) = run() {
/// # ::std::process::exit(1);
/// # }
/// # }
/// # fn run() -> Result<(), io::Error> {
/// let mut file = NamedTempFile::new()?;
/// writeln!(file, "Brian was here. Briefly.")?;
///
/// let path = file.into_temp_path();
/// path.persist("./saved_file.txt")?;
/// # Ok(())
/// # }
/// ```
///
/// [`PathPersistError`]: struct.PathPersistError.html
pub fn persist<P: AsRef<Path>>(mut self, new_path: P) -> Result<(), PathPersistError> {
match imp::persist(&self.path, new_path.as_ref(), true) {
Ok(_) => {
// Don't drop `self`. We don't want to try deleting the old
// temporary file path. (It'll fail, but the failure is never
// seen.)
self.path = PathBuf::new().into_boxed_path();
mem::forget(self);
Ok(())
}
Err(e) => Err(PathPersistError {
error: e,
path: self,
}),
}
}
/// Persist the temporary file at the target path if and only if no file exists there.
///
/// If a file exists at the target path, fail. If this method fails, it will
/// return `self` in the resulting [`PathPersistError`].
///
/// Note: Temporary files cannot be persisted across filesystems. Also Note:
/// This method is not atomic. It can leave the original link to the
/// temporary file behind.
///
/// # Security
///
/// Only use this method if you're positive that a temporary file cleaner
/// won't have deleted your file. Otherwise, you might end up persisting an
/// attacker controlled file.
///
/// # Errors
///
/// If the file cannot be moved to the new location or a file already exists
/// there, `Err` is returned.
///
/// # Examples
///
/// ```no_run
/// # use std::io::{self, Write};
/// use tempfile::NamedTempFile;
///
/// # fn main() {
/// # if let Err(_) = run() {
/// # ::std::process::exit(1);
/// # }
/// # }
/// # fn run() -> Result<(), io::Error> {
/// let mut file = NamedTempFile::new()?;
/// writeln!(file, "Brian was here. Briefly.")?;
///
/// let path = file.into_temp_path();
/// path.persist_noclobber("./saved_file.txt")?;
/// # Ok(())
/// # }
/// ```
///
/// [`PathPersistError`]: struct.PathPersistError.html
pub fn persist_noclobber<P: AsRef<Path>>(
mut self,
new_path: P,
) -> Result<(), PathPersistError> {
match imp::persist(&self.path, new_path.as_ref(), false) {
Ok(_) => {
// Don't drop `self`. We don't want to try deleting the old
// temporary file path. (It'll fail, but the failure is never
// seen.)
self.path = PathBuf::new().into_boxed_path();
mem::forget(self);
Ok(())
}
Err(e) => Err(PathPersistError {
error: e,
path: self,
}),
}
}
/// Keep the temporary file from being deleted. This function will turn the
/// temporary file into a non-temporary file without moving it.
///
///
/// # Errors
///
/// On some platforms (e.g., Windows), we need to mark the file as
/// non-temporary. This operation could fail.
///
/// # Examples
///
/// ```no_run
/// # use std::io::{self, Write};
/// use tempfile::NamedTempFile;
///
/// # fn main() {
/// # if let Err(_) = run() {
/// # ::std::process::exit(1);
/// # }
/// # }
/// # fn run() -> Result<(), io::Error> {
/// let mut file = NamedTempFile::new()?;
/// writeln!(file, "Brian was here. Briefly.")?;
///
/// let path = file.into_temp_path();
/// let path = path.keep()?;
/// # Ok(())
/// # }
/// ```
///
/// [`PathPersistError`]: struct.PathPersistError.html
pub fn keep(mut self) -> Result<PathBuf, PathPersistError> {
match imp::keep(&self.path) {
Ok(_) => {
// Don't drop `self`. We don't want to try deleting the old
// temporary file path. (It'll fail, but the failure is never
// seen.)
let path = mem::replace(&mut self.path, PathBuf::new().into_boxed_path());
mem::forget(self);
Ok(path.into())
}
Err(e) => Err(PathPersistError {
error: e,
path: self,
}),
}
}
/// Create a new TempPath from an existing path. This can be done even if no
/// file exists at the given path.
///
/// This is mostly useful for interacting with libraries and external
/// components that provide files to be consumed or expect a path with no
/// existing file to be given.
pub fn from_path(path: impl Into<PathBuf>) -> Self {
Self {
path: path.into().into_boxed_path(),
}
}
}
impl fmt::Debug for TempPath {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
self.path.fmt(f)
}
}
impl Drop for TempPath {
fn drop(&mut self) {
let _ = fs::remove_file(&self.path);
}
}
impl Deref for TempPath {
type Target = Path;
fn deref(&self) -> &Path {
&self.path
}
}
impl AsRef<Path> for TempPath {
fn as_ref(&self) -> &Path {
&self.path
}
}
impl AsRef<OsStr> for TempPath {
fn as_ref(&self) -> &OsStr {
self.path.as_os_str()
}
}
/// A named temporary file.
///
/// The default constructor, [`NamedTempFile::new()`], creates files in
/// the location returned by [`std::env::temp_dir()`], but `NamedTempFile`
/// can be configured to manage a temporary file in any location
/// by constructing with [`NamedTempFile::new_in()`].
///
/// # Security
///
/// Most operating systems employ temporary file cleaners to delete old
/// temporary files. Unfortunately these temporary file cleaners don't always
/// reliably _detect_ whether the temporary file is still being used.
///
/// Specifically, the following sequence of events can happen:
///
/// 1. A user creates a temporary file with `NamedTempFile::new()`.
/// 2. Time passes.
/// 3. The temporary file cleaner deletes (unlinks) the temporary file from the
/// filesystem.
/// 4. Some other program creates a new file to replace this deleted temporary
/// file.
/// 5. The user tries to re-open the temporary file (in the same program or in a
/// different program) by path. Unfortunately, they'll end up opening the
/// file created by the other program, not the original file.
///
/// ## Operating System Specific Concerns
///
/// The behavior of temporary files and temporary file cleaners differ by
/// operating system.
///
/// ### Windows
///
/// On Windows, open files _can't_ be deleted. This removes most of the concerns
/// around temporary file cleaners.
///
/// Furthermore, temporary files are, by default, created in per-user temporary
/// file directories so only an application running as the same user would be
/// able to interfere (which they could do anyways). However, an application
/// running as the same user can still _accidentally_ re-create deleted
/// temporary files if the number of random bytes in the temporary file name is
/// too small.
///
/// So, the only real concern on Windows is:
///
/// 1. Opening a named temporary file in a world-writable directory.
/// 2. Using the `into_temp_path()` and/or `into_parts()` APIs to close the file
/// handle without deleting the underlying file.
/// 3. Continuing to use the file by path.
///
/// ### UNIX
///
/// Unlike on Windows, UNIX (and UNIX like) systems allow open files to be
/// "unlinked" (deleted).
///
/// #### MacOS
///
/// Like on Windows, temporary files are created in per-user temporary file
/// directories by default so calling `NamedTempFile::new()` should be
/// relatively safe.
///
/// #### Linux
///
/// Unfortunately, most _Linux_ distributions don't create per-user temporary
/// file directories. Worse, systemd's tmpfiles daemon (a common temporary file
/// cleaner) will happily remove open temporary files if they haven't been
/// modified within the last 10 days.
///
/// # Resource Leaking
///
/// If the program exits before the `NamedTempFile` destructor is
/// run, the temporary file will not be deleted. This can happen
/// if the process exits using [`std::process::exit()`], a segfault occurs,
/// receiving an interrupt signal like `SIGINT` that is not handled, or by using
/// a statically declared `NamedTempFile` instance (like with [`lazy_static`]).
///
/// Use the [`tempfile()`] function unless you need a named file path.
///
/// [`tempfile()`]: fn.tempfile.html
/// [`NamedTempFile::new()`]: #method.new
/// [`NamedTempFile::new_in()`]: #method.new_in
pub struct NamedTempFile<F = File> {
path: TempPath,
file: F,
}
impl<F> fmt::Debug for NamedTempFile<F> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "NamedTempFile({:?})", self.path)
}
}
impl<F> AsRef<Path> for NamedTempFile<F> {
#[inline]
fn as_ref(&self) -> &Path {
self.path()
}
}
/// Error returned when persisting a temporary file fails.
pub struct PersistError<F = File> {
/// The underlying IO error.
pub error: io::Error,
/// The temporary file that couldn't be persisted.
pub file: NamedTempFile<F>,
}
impl<F> fmt::Debug for PersistError<F> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "PersistError({:?})", self.error)
}
}
impl<F> From<PersistError<F>> for io::Error {
#[inline]
fn from(error: PersistError<F>) -> io::Error {
error.error
}
}
impl<F> From<PersistError<F>> for NamedTempFile<F> {
#[inline]
fn from(error: PersistError<F>) -> NamedTempFile<F> {
error.file
}
}
impl<F> fmt::Display for PersistError<F> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "failed to persist temporary file: {}", self.error)
}
}
impl<F> error::Error for PersistError<F> {
fn source(&self) -> Option<&(dyn error::Error + 'static)> {
Some(&self.error)
}
}
impl NamedTempFile<File> {
/// Create a new named temporary file.
///
/// See [`Builder`] for more configuration.
///
/// # Security
///
/// This will create a temporary file in the default temporary file
/// directory (platform dependent). This has security implications on many
/// platforms so please read the security section of this type's
/// documentation.
///
/// Reasons to use this method:
///
/// 1. The file has a short lifetime and your temporary file cleaner is
/// sane (doesn't delete recently accessed files).
///
/// 2. You trust every user on your system (i.e. you are the only user).
///
/// 3. You have disabled your system's temporary file cleaner or verified
/// that your system doesn't have a temporary file cleaner.
///
/// Reasons not to use this method:
///
/// 1. You'll fix it later. No you won't.
///
/// 2. You don't care about the security of the temporary file. If none of
/// the "reasons to use this method" apply, referring to a temporary
/// file by name may allow an attacker to create/overwrite your
/// non-temporary files. There are exceptions but if you don't already
/// know them, don't use this method.
///
/// # Errors
///
/// If the file can not be created, `Err` is returned.
///
/// # Examples
///
/// Create a named temporary file and write some data to it:
///
/// ```no_run
/// # use std::io::{self, Write};
/// use tempfile::NamedTempFile;
///
/// # fn main() {
/// # if let Err(_) = run() {
/// # ::std::process::exit(1);
/// # }
/// # }
/// # fn run() -> Result<(), ::std::io::Error> {
/// let mut file = NamedTempFile::new()?;
///
/// writeln!(file, "Brian was here. Briefly.")?;
/// # Ok(())
/// # }
/// ```
///
/// [`Builder`]: struct.Builder.html
pub fn new() -> io::Result<NamedTempFile> {
Builder::new().tempfile()
}
/// Create a new named temporary file in the specified directory.
///
/// This is equivalent to:
///
/// ```ignore
/// Builder::new().tempfile_in(dir)
/// ```
///
/// See [`NamedTempFile::new()`] for details.
///
/// [`NamedTempFile::new()`]: #method.new
pub fn new_in<P: AsRef<Path>>(dir: P) -> io::Result<NamedTempFile> {
Builder::new().tempfile_in(dir)
}
/// Create a new named temporary file with the specified filename prefix.
///
/// See [`NamedTempFile::new()`] for details.
///
/// [`NamedTempFile::new()`]: #method.new
pub fn with_prefix<S: AsRef<OsStr>>(prefix: S) -> io::Result<NamedTempFile> {
Builder::new().prefix(&prefix).tempfile()
}
/// Create a new named temporary file with the specified filename prefix,
/// in the specified directory.
///
/// This is equivalent to:
///
/// ```ignore
/// Builder::new().prefix(&prefix).tempfile_in(directory)
/// ```
///
/// See [`NamedTempFile::new()`] for details.
///
/// [`NamedTempFile::new()`]: #method.new
pub fn with_prefix_in<S: AsRef<OsStr>, P: AsRef<Path>>(
prefix: S,
dir: P,
) -> io::Result<NamedTempFile> {
Builder::new().prefix(&prefix).tempfile_in(dir)
}
}
impl<F> NamedTempFile<F> {
/// Get the temporary file's path.
///
/// # Security
///
/// Referring to a temporary file's path may not be secure in all cases.
/// Please read the security section on the top level documentation of this
/// type for details.
///
/// # Examples
///
/// ```no_run
/// # use std::io::{self, Write};
/// use tempfile::NamedTempFile;
///
/// # fn main() {
/// # if let Err(_) = run() {
/// # ::std::process::exit(1);
/// # }
/// # }
/// # fn run() -> Result<(), ::std::io::Error> {
/// let file = NamedTempFile::new()?;
///
/// println!("{:?}", file.path());
/// # Ok(())
/// # }
/// ```
#[inline]
pub fn path(&self) -> &Path {
&self.path
}
/// Close and remove the temporary file.
///
/// Use this if you want to detect errors in deleting the file.
///
/// # Errors
///
/// If the file cannot be deleted, `Err` is returned.
///
/// # Examples
///
/// ```no_run
/// # use std::io;
/// use tempfile::NamedTempFile;
///
/// # fn main() {
/// # if let Err(_) = run() {
/// # ::std::process::exit(1);
/// # }
/// # }
/// # fn run() -> Result<(), io::Error> {
/// let file = NamedTempFile::new()?;
///
/// // By closing the `NamedTempFile` explicitly, we can check that it has
/// // been deleted successfully. If we don't close it explicitly,
/// // the file will still be deleted when `file` goes out
/// // of scope, but we won't know whether deleting the file
/// // succeeded.
/// file.close()?;
/// # Ok(())
/// # }
/// ```
pub fn close(self) -> io::Result<()> {
let NamedTempFile { path, .. } = self;
path.close()
}
/// Persist the temporary file at the target path.
///
/// If a file exists at the target path, persist will atomically replace it.
/// If this method fails, it will return `self` in the resulting
/// [`PersistError`].
///
/// Note: Temporary files cannot be persisted across filesystems. Also
/// neither the file contents nor the containing directory are
/// synchronized, so the update may not yet have reached the disk when
/// `persist` returns.
///
/// # Security
///
/// This method persists the temporary file using its path and may not be
/// secure in all cases. Please read the security section on the top
/// level documentation of this type for details.
///
/// # Errors
///
/// If the file cannot be moved to the new location, `Err` is returned.
///
/// # Examples
///
/// ```no_run
/// # use std::io::{self, Write};
/// use tempfile::NamedTempFile;
///
/// # fn main() {
/// # if let Err(_) = run() {
/// # ::std::process::exit(1);
/// # }
/// # }
/// # fn run() -> Result<(), io::Error> {
/// let file = NamedTempFile::new()?;
///
/// let mut persisted_file = file.persist("./saved_file.txt")?;
/// writeln!(persisted_file, "Brian was here. Briefly.")?;
/// # Ok(())
/// # }
/// ```
///
/// [`PersistError`]: struct.PersistError.html
pub fn persist<P: AsRef<Path>>(self, new_path: P) -> Result<F, PersistError<F>> {
let NamedTempFile { path, file } = self;
match path.persist(new_path) {
Ok(_) => Ok(file),
Err(err) => {
let PathPersistError { error, path } = err;
Err(PersistError {
file: NamedTempFile { path, file },
error,
})
}
}
}
/// Persist the temporary file at the target path if and only if no file exists there.
///
/// If a file exists at the target path, fail. If this method fails, it will
/// return `self` in the resulting PersistError.
///
/// Note: Temporary files cannot be persisted across filesystems. Also Note:
/// This method is not atomic. It can leave the original link to the
/// temporary file behind.
///
/// # Security
///
/// This method persists the temporary file using its path and may not be
/// secure in all cases. Please read the security section on the top
/// level documentation of this type for details.
///
/// # Errors
///
/// If the file cannot be moved to the new location or a file already exists there,
/// `Err` is returned.
///
/// # Examples
///
/// ```no_run
/// # use std::io::{self, Write};
/// use tempfile::NamedTempFile;
///
/// # fn main() {
/// # if let Err(_) = run() {
/// # ::std::process::exit(1);
/// # }
/// # }
/// # fn run() -> Result<(), io::Error> {
/// let file = NamedTempFile::new()?;
///
/// let mut persisted_file = file.persist_noclobber("./saved_file.txt")?;
/// writeln!(persisted_file, "Brian was here. Briefly.")?;
/// # Ok(())
/// # }
/// ```
pub fn persist_noclobber<P: AsRef<Path>>(self, new_path: P) -> Result<F, PersistError<F>> {
let NamedTempFile { path, file } = self;
match path.persist_noclobber(new_path) {
Ok(_) => Ok(file),
Err(err) => {
let PathPersistError { error, path } = err;
Err(PersistError {
file: NamedTempFile { path, file },
error,
})
}
}
}
/// Keep the temporary file from being deleted. This function will turn the
/// temporary file into a non-temporary file without moving it.
///
///
/// # Errors
///
/// On some platforms (e.g., Windows), we need to mark the file as
/// non-temporary. This operation could fail.
///
/// # Examples
///
/// ```no_run
/// # use std::io::{self, Write};
/// use tempfile::NamedTempFile;
///
/// # fn main() {
/// # if let Err(_) = run() {
/// # ::std::process::exit(1);
/// # }
/// # }
/// # fn run() -> Result<(), io::Error> {
/// let mut file = NamedTempFile::new()?;
/// writeln!(file, "Brian was here. Briefly.")?;
///
/// let (file, path) = file.keep()?;
/// # Ok(())
/// # }
/// ```
///
/// [`PathPersistError`]: struct.PathPersistError.html
pub fn keep(self) -> Result<(F, PathBuf), PersistError<F>> {
let (file, path) = (self.file, self.path);
match path.keep() {
Ok(path) => Ok((file, path)),
Err(PathPersistError { error, path }) => Err(PersistError {
file: NamedTempFile { path, file },
error,
}),
}
}
/// Get a reference to the underlying file.
pub fn as_file(&self) -> &F {
&self.file
}
/// Get a mutable reference to the underlying file.
pub fn as_file_mut(&mut self) -> &mut F {
&mut self.file
}
/// Convert the temporary file into a `std::fs::File`.
///
/// The inner file will be deleted.
pub fn into_file(self) -> F {
self.file
}
/// Closes the file, leaving only the temporary file path.
///
/// This is useful when another process must be able to open the temporary
/// file.
pub fn into_temp_path(self) -> TempPath {
self.path
}
/// Converts the named temporary file into its constituent parts.
///
/// Note: When the path is dropped, the file is deleted but the file handle
/// is still usable.
pub fn into_parts(self) -> (F, TempPath) {
(self.file, self.path)
}
/// Creates a `NamedTempFile` from its constituent parts.
///
/// This can be used with [`NamedTempFile::into_parts`] to reconstruct the
/// `NamedTempFile`.
pub fn from_parts(file: F, path: TempPath) -> Self {
Self { file, path }
}
}
impl NamedTempFile<File> {
/// Securely reopen the temporary file.
///
/// This function is useful when you need multiple independent handles to
/// the same file. It's perfectly fine to drop the original `NamedTempFile`
/// while holding on to `File`s returned by this function; the `File`s will
/// remain usable. However, they may not be nameable.
///
/// # Errors
///
/// If the file cannot be reopened, `Err` is returned.
///
/// # Security
///
/// Unlike `File::open(my_temp_file.path())`, `NamedTempFile::reopen()`
/// guarantees that the re-opened file is the _same_ file, even in the
/// presence of pathological temporary file cleaners.
///
/// # Examples
///
/// ```no_run
/// # use std::io;
/// use tempfile::NamedTempFile;
///
/// # fn main() {
/// # if let Err(_) = run() {
/// # ::std::process::exit(1);
/// # }
/// # }
/// # fn run() -> Result<(), io::Error> {
/// let file = NamedTempFile::new()?;
///
/// let another_handle = file.reopen()?;
/// # Ok(())
/// # }
/// ```
pub fn reopen(&self) -> io::Result<File> {
imp::reopen(self.as_file(), NamedTempFile::path(self))
.with_err_path(|| NamedTempFile::path(self))
}
}
impl<F: Read> Read for NamedTempFile<F> {
fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
self.as_file_mut().read(buf).with_err_path(|| self.path())
}
fn read_vectored(&mut self, bufs: &mut [io::IoSliceMut<'_>]) -> io::Result<usize> {
self.as_file_mut()
.read_vectored(bufs)
.with_err_path(|| self.path())
}
fn read_to_end(&mut self, buf: &mut Vec<u8>) -> io::Result<usize> {
self.as_file_mut()
.read_to_end(buf)
.with_err_path(|| self.path())
}
fn read_to_string(&mut self, buf: &mut String) -> io::Result<usize> {
self.as_file_mut()
.read_to_string(buf)
.with_err_path(|| self.path())
}
fn read_exact(&mut self, buf: &mut [u8]) -> io::Result<()> {
self.as_file_mut()
.read_exact(buf)
.with_err_path(|| self.path())
}
}
impl Read for &NamedTempFile<File> {
fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
self.as_file().read(buf).with_err_path(|| self.path())
}
fn read_vectored(&mut self, bufs: &mut [io::IoSliceMut<'_>]) -> io::Result<usize> {
self.as_file()
.read_vectored(bufs)
.with_err_path(|| self.path())
}
fn read_to_end(&mut self, buf: &mut Vec<u8>) -> io::Result<usize> {
self.as_file()
.read_to_end(buf)
.with_err_path(|| self.path())
}
fn read_to_string(&mut self, buf: &mut String) -> io::Result<usize> {
self.as_file()
.read_to_string(buf)
.with_err_path(|| self.path())
}
fn read_exact(&mut self, buf: &mut [u8]) -> io::Result<()> {
self.as_file().read_exact(buf).with_err_path(|| self.path())
}
}
impl<F: Write> Write for NamedTempFile<F> {
fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
self.as_file_mut().write(buf).with_err_path(|| self.path())
}
#[inline]
fn flush(&mut self) -> io::Result<()> {
self.as_file_mut().flush().with_err_path(|| self.path())
}
fn write_vectored(&mut self, bufs: &[io::IoSlice<'_>]) -> io::Result<usize> {
self.as_file_mut()
.write_vectored(bufs)
.with_err_path(|| self.path())
}
fn write_all(&mut self, buf: &[u8]) -> io::Result<()> {
self.as_file_mut()
.write_all(buf)
.with_err_path(|| self.path())
}
fn write_fmt(&mut self, fmt: fmt::Arguments<'_>) -> io::Result<()> {
self.as_file_mut()
.write_fmt(fmt)
.with_err_path(|| self.path())
}
}
impl Write for &NamedTempFile<File> {
fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
self.as_file().write(buf).with_err_path(|| self.path())
}
#[inline]
fn flush(&mut self) -> io::Result<()> {
self.as_file().flush().with_err_path(|| self.path())
}
fn write_vectored(&mut self, bufs: &[io::IoSlice<'_>]) -> io::Result<usize> {
self.as_file()
.write_vectored(bufs)
.with_err_path(|| self.path())
}
fn write_all(&mut self, buf: &[u8]) -> io::Result<()> {
self.as_file().write_all(buf).with_err_path(|| self.path())
}
fn write_fmt(&mut self, fmt: fmt::Arguments<'_>) -> io::Result<()> {
self.as_file().write_fmt(fmt).with_err_path(|| self.path())
}
}
impl<F: Seek> Seek for NamedTempFile<F> {
fn seek(&mut self, pos: SeekFrom) -> io::Result<u64> {
self.as_file_mut().seek(pos).with_err_path(|| self.path())
}
}
impl Seek for &NamedTempFile<File> {
fn seek(&mut self, pos: SeekFrom) -> io::Result<u64> {
self.as_file().seek(pos).with_err_path(|| self.path())
}
}
#[cfg(any(unix, target_os = "wasi"))]
impl<F: AsFd> AsFd for NamedTempFile<F> {
fn as_fd(&self) -> BorrowedFd<'_> {
self.as_file().as_fd()
}
}
#[cfg(any(unix, target_os = "wasi"))]
impl<F: AsRawFd> AsRawFd for NamedTempFile<F> {
#[inline]
fn as_raw_fd(&self) -> RawFd {
self.as_file().as_raw_fd()
}
}
#[cfg(windows)]
impl<F: AsHandle> AsHandle for NamedTempFile<F> {
#[inline]
fn as_handle(&self) -> BorrowedHandle<'_> {
self.as_file().as_handle()
}
}
#[cfg(windows)]
impl<F: AsRawHandle> AsRawHandle for NamedTempFile<F> {
#[inline]
fn as_raw_handle(&self) -> RawHandle {
self.as_file().as_raw_handle()
}
}
pub(crate) fn create_named(
mut path: PathBuf,
open_options: &mut OpenOptions,
) -> io::Result<NamedTempFile> {
// Make the path absolute. Otherwise, changing directories could cause us to
// delete the wrong file.
if !path.is_absolute() {
path = env::current_dir()?.join(path)
}
imp::create_named(&path, open_options)
.with_err_path(|| path.clone())
.map(|file| NamedTempFile {
path: TempPath {
path: path.into_boxed_path(),
},
file,
})
}