diff options
Diffstat (limited to 'third_party/rust/tempfile/src/file/mod.rs')
| -rw-r--r-- | third_party/rust/tempfile/src/file/mod.rs | 1124 |
1 files changed, 1124 insertions, 0 deletions
diff --git a/third_party/rust/tempfile/src/file/mod.rs b/third_party/rust/tempfile/src/file/mod.rs new file mode 100644 index 0000000000..8a28343e04 --- /dev/null +++ b/third_party/rust/tempfile/src/file/mod.rs @@ -0,0 +1,1124 @@ +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(()) +/// # } +/// ``` +/// +/// [`std::env::temp_dir()`]: https://doc.rust-lang.org/std/env/fn.temp_dir.html +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(()) +/// # } +/// ``` +/// +/// [`std::env::temp_dir()`]: https://doc.rust-lang.org/std/env/fn.temp_dir.html +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 +/// [`std::env::temp_dir()`]: https://doc.rust-lang.org/std/env/fn.temp_dir.html +/// [`std::process::exit()`]: http://doc.rust-lang.org/std/process/fn.exit.html +/// [`lazy_static`]: https://github.com/rust-lang-nursery/lazy-static.rs/issues/62 +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, + }) +} |