Struct camino_tempfile::Utf8TempPath

pub struct Utf8TempPath { /* private fields */ }

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.

Implementations

impl Utf8TempPath

pub fn close(self) -> Result<()>

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

use camino_tempfile::NamedUtf8TempFile;

let file = NamedUtf8TempFile::new()?;

// Close the file, but keep the path to it around.
let path = file.into_temp_path();

// By closing the `Utf8TempPath` 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()?;

pub fn persist<P: AsRef<Path>>( self, new_path: P ) -> Result<(), Utf8PathPersistError>

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 Utf8PathPersistError.

Notes

• This method accepts AsRef<Path> rather than AsRef<Utf8Path>, because in the success case it does not return anything.
• Temporary files cannot be persisted across filesystems.
• 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

use camino_tempfile::NamedUtf8TempFile;

let mut file = NamedUtf8TempFile::new()?;
writeln!(file, "Brian was here. Briefly.")?;

let path = file.into_temp_path();
path.persist("./saved_file.txt")?;

pub fn persist_noclobber<P: AsRef<Path>>( self, new_path: P ) -> Result<(), Utf8PathPersistError>

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 Utf8PathPersistError.

Notes

• This method accepts AsRef<Path> rather than AsRef<Utf8Path>, because in the success case it does not return anything.
• Temporary files cannot be persisted across filesystems.
• 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

use camino_tempfile::NamedUtf8TempFile;

let mut file = NamedUtf8TempFile::new()?;
writeln!(file, "Brian was here. Briefly.")?;

let path = file.into_temp_path();
path.persist_noclobber("./saved_file.txt")?;

pub fn keep(self) -> Result<Utf8PathBuf, Utf8PathPersistError>

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

use camino_tempfile::NamedUtf8TempFile;

let mut file = NamedUtf8TempFile::new()?;
writeln!(file, "Brian was here. Briefly.")?;

let path = file.into_temp_path();
let path = path.keep()?;

pub fn from_path(path: impl Into<Utf8PathBuf>) -> Self

Create a new Utf8TempPath 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.

Methods from Deref<Target = Utf8Path>

pub fn as_std_path(&self) -> &Path

Converts a Utf8Path to a Path.

This is equivalent to the AsRef<&Path> for &Utf8Path impl, but may aid in type inference.

Examples

use camino::Utf8Path;
use std::path::Path;

let utf8_path = Utf8Path::new("foo.txt");
let std_path: &Path = utf8_path.as_std_path();
assert_eq!(std_path.to_str(), Some("foo.txt"));

// Convert back to a Utf8Path.
let new_utf8_path = Utf8Path::from_path(std_path).unwrap();
assert_eq!(new_utf8_path, "foo.txt");

pub fn as_str(&self) -> &str

Yields the underlying str slice.

Unlike Path::to_str, this always returns a slice because the contents of a Utf8Path are guaranteed to be valid UTF-8.

Examples

use camino::Utf8Path;

let s = Utf8Path::new("foo.txt").as_str();
assert_eq!(s, "foo.txt");

pub fn as_os_str(&self) -> &OsStr

Yields the underlying OsStr slice.

Examples

use camino::Utf8Path;

let os_str = Utf8Path::new("foo.txt").as_os_str();
assert_eq!(os_str, std::ffi::OsStr::new("foo.txt"));

pub fn to_path_buf(&self) -> Utf8PathBuf

Converts a Utf8Path to an owned Utf8PathBuf.

Examples

use camino::{Utf8Path, Utf8PathBuf};

let path_buf = Utf8Path::new("foo.txt").to_path_buf();
assert_eq!(path_buf, Utf8PathBuf::from("foo.txt"));

pub fn is_absolute(&self) -> bool

Returns true if the Utf8Path is absolute, i.e., if it is independent of the current directory.

• On Unix, a path is absolute if it starts with the root, so is_absolute and has_root are equivalent.

• On Windows, a path is absolute if it has a prefix and starts with the root: c:\windows is absolute, while c:temp and \temp are not.

Examples

use camino::Utf8Path;

assert!(!Utf8Path::new("foo.txt").is_absolute());

pub fn is_relative(&self) -> bool

Returns true if the Utf8Path is relative, i.e., not absolute.

See is_absolute’s documentation for more details.

Examples

use camino::Utf8Path;

assert!(Utf8Path::new("foo.txt").is_relative());

pub fn has_root(&self) -> bool

Returns true if the Utf8Path has a root.

• On Unix, a path has a root if it begins with /.

• On Windows, a path has a root if it:

  • has no prefix and begins with a separator, e.g., \windows
  • has a prefix followed by a separator, e.g., c:\windows but not c:windows
  • has any non-disk prefix, e.g., \\server\share

Examples

use camino::Utf8Path;

assert!(Utf8Path::new("/etc/passwd").has_root());

pub fn parent(&self) -> Option<&Utf8Path>

Returns the Path without its final component, if there is one.

Returns None if the path terminates in a root or prefix.

Examples

use camino::Utf8Path;

let path = Utf8Path::new("/foo/bar");
let parent = path.parent().unwrap();
assert_eq!(parent, Utf8Path::new("/foo"));

let grand_parent = parent.parent().unwrap();
assert_eq!(grand_parent, Utf8Path::new("/"));
assert_eq!(grand_parent.parent(), None);

pub fn ancestors(&self) -> Utf8Ancestors<'_>

Produces an iterator over Utf8Path and its ancestors.

The iterator will yield the Utf8Path that is returned if the parent method is used zero or more times. That means, the iterator will yield &self, &self.parent().unwrap(), &self.parent().unwrap().parent().unwrap() and so on. If the parent method returns None, the iterator will do likewise. The iterator will always yield at least one value, namely &self.

Examples

use camino::Utf8Path;

let mut ancestors = Utf8Path::new("/foo/bar").ancestors();
assert_eq!(ancestors.next(), Some(Utf8Path::new("/foo/bar")));
assert_eq!(ancestors.next(), Some(Utf8Path::new("/foo")));
assert_eq!(ancestors.next(), Some(Utf8Path::new("/")));
assert_eq!(ancestors.next(), None);

let mut ancestors = Utf8Path::new("../foo/bar").ancestors();
assert_eq!(ancestors.next(), Some(Utf8Path::new("../foo/bar")));
assert_eq!(ancestors.next(), Some(Utf8Path::new("../foo")));
assert_eq!(ancestors.next(), Some(Utf8Path::new("..")));
assert_eq!(ancestors.next(), Some(Utf8Path::new("")));
assert_eq!(ancestors.next(), None);

pub fn file_name(&self) -> Option<&str>

Returns the final component of the Utf8Path, if there is one.

If the path is a normal file, this is the file name. If it’s the path of a directory, this is the directory name.

Returns None if the path terminates in ...

Examples

use camino::Utf8Path;

assert_eq!(Some("bin"), Utf8Path::new("/usr/bin/").file_name());
assert_eq!(Some("foo.txt"), Utf8Path::new("tmp/foo.txt").file_name());
assert_eq!(Some("foo.txt"), Utf8Path::new("foo.txt/.").file_name());
assert_eq!(Some("foo.txt"), Utf8Path::new("foo.txt/.//").file_name());
assert_eq!(None, Utf8Path::new("foo.txt/..").file_name());
assert_eq!(None, Utf8Path::new("/").file_name());

pub fn strip_prefix( &self, base: impl AsRef<Path> ) -> Result<&Utf8Path, StripPrefixError>

Returns a path that, when joined onto base, yields self.

Errors

If base is not a prefix of self (i.e., starts_with returns false), returns Err.

Examples

use camino::{Utf8Path, Utf8PathBuf};

let path = Utf8Path::new("/test/haha/foo.txt");

assert_eq!(path.strip_prefix("/"), Ok(Utf8Path::new("test/haha/foo.txt")));
assert_eq!(path.strip_prefix("/test"), Ok(Utf8Path::new("haha/foo.txt")));
assert_eq!(path.strip_prefix("/test/"), Ok(Utf8Path::new("haha/foo.txt")));
assert_eq!(path.strip_prefix("/test/haha/foo.txt"), Ok(Utf8Path::new("")));
assert_eq!(path.strip_prefix("/test/haha/foo.txt/"), Ok(Utf8Path::new("")));

assert!(path.strip_prefix("test").is_err());
assert!(path.strip_prefix("/haha").is_err());

let prefix = Utf8PathBuf::from("/test/");
assert_eq!(path.strip_prefix(prefix), Ok(Utf8Path::new("haha/foo.txt")));

pub fn starts_with(&self, base: impl AsRef<Path>) -> bool

Determines whether base is a prefix of self.

Only considers whole path components to match.

Examples

use camino::Utf8Path;

let path = Utf8Path::new("/etc/passwd");

assert!(path.starts_with("/etc"));
assert!(path.starts_with("/etc/"));
assert!(path.starts_with("/etc/passwd"));
assert!(path.starts_with("/etc/passwd/")); // extra slash is okay
assert!(path.starts_with("/etc/passwd///")); // multiple extra slashes are okay

assert!(!path.starts_with("/e"));
assert!(!path.starts_with("/etc/passwd.txt"));

assert!(!Utf8Path::new("/etc/foo.rs").starts_with("/etc/foo"));

pub fn ends_with(&self, base: impl AsRef<Path>) -> bool

Determines whether child is a suffix of self.

Only considers whole path components to match.

Examples

use camino::Utf8Path;

let path = Utf8Path::new("/etc/resolv.conf");

assert!(path.ends_with("resolv.conf"));
assert!(path.ends_with("etc/resolv.conf"));
assert!(path.ends_with("/etc/resolv.conf"));

assert!(!path.ends_with("/resolv.conf"));
assert!(!path.ends_with("conf")); // use .extension() instead

pub fn file_stem(&self) -> Option<&str>

Extracts the stem (non-extension) portion of self.file_name.

The stem is:

• None, if there is no file name;
• The entire file name if there is no embedded .;
• The entire file name if the file name begins with . and has no other .s within;
• Otherwise, the portion of the file name before the final .

Examples

use camino::Utf8Path;

assert_eq!("foo", Utf8Path::new("foo.rs").file_stem().unwrap());
assert_eq!("foo.tar", Utf8Path::new("foo.tar.gz").file_stem().unwrap());

pub fn extension(&self) -> Option<&str>

Extracts the extension of self.file_name, if possible.

The extension is:

• None, if there is no file name;
• None, if there is no embedded .;
• None, if the file name begins with . and has no other .s within;
• Otherwise, the portion of the file name after the final .

Examples

use camino::Utf8Path;

assert_eq!("rs", Utf8Path::new("foo.rs").extension().unwrap());
assert_eq!("gz", Utf8Path::new("foo.tar.gz").extension().unwrap());

pub fn join(&self, path: impl AsRef<Utf8Path>) -> Utf8PathBuf

Creates an owned Utf8PathBuf with path adjoined to self.

See Utf8PathBuf::push for more details on what it means to adjoin a path.

Examples

use camino::{Utf8Path, Utf8PathBuf};

assert_eq!(Utf8Path::new("/etc").join("passwd"), Utf8PathBuf::from("/etc/passwd"));

pub fn join_os(&self, path: impl AsRef<Path>) -> PathBuf

Creates an owned PathBuf with path adjoined to self.

See PathBuf::push for more details on what it means to adjoin a path.

Examples

use camino::Utf8Path;
use std::path::PathBuf;

assert_eq!(Utf8Path::new("/etc").join_os("passwd"), PathBuf::from("/etc/passwd"));

pub fn with_file_name(&self, file_name: impl AsRef<str>) -> Utf8PathBuf

Creates an owned Utf8PathBuf like self but with the given file name.

See Utf8PathBuf::set_file_name for more details.

Examples

use camino::{Utf8Path, Utf8PathBuf};

let path = Utf8Path::new("/tmp/foo.txt");
assert_eq!(path.with_file_name("bar.txt"), Utf8PathBuf::from("/tmp/bar.txt"));

let path = Utf8Path::new("/tmp");
assert_eq!(path.with_file_name("var"), Utf8PathBuf::from("/var"));

pub fn with_extension(&self, extension: impl AsRef<str>) -> Utf8PathBuf

Creates an owned Utf8PathBuf like self but with the given extension.

See Utf8PathBuf::set_extension for more details.

Examples

use camino::{Utf8Path, Utf8PathBuf};

let path = Utf8Path::new("foo.rs");
assert_eq!(path.with_extension("txt"), Utf8PathBuf::from("foo.txt"));

let path = Utf8Path::new("foo.tar.gz");
assert_eq!(path.with_extension(""), Utf8PathBuf::from("foo.tar"));
assert_eq!(path.with_extension("xz"), Utf8PathBuf::from("foo.tar.xz"));
assert_eq!(path.with_extension("").with_extension("txt"), Utf8PathBuf::from("foo.txt"));

pub fn components(&self) -> Utf8Components<'_>

Produces an iterator over the Utf8Components of the path.

When parsing the path, there is a small amount of normalization:

• Repeated separators are ignored, so a/b and a//b both have a and b as components.

• Occurrences of . are normalized away, except if they are at the beginning of the path. For example, a/./b, a/b/, a/b/. and a/b all have a and b as components, but ./a/b starts with an additional CurDir component.

• A trailing slash is normalized away, /a/b and /a/b/ are equivalent.

Note that no other normalization takes place; in particular, a/c and a/b/../c are distinct, to account for the possibility that b is a symbolic link (so its parent isn’t a).

Examples

use camino::{Utf8Component, Utf8Path};

let mut components = Utf8Path::new("/tmp/foo.txt").components();

assert_eq!(components.next(), Some(Utf8Component::RootDir));
assert_eq!(components.next(), Some(Utf8Component::Normal("tmp")));
assert_eq!(components.next(), Some(Utf8Component::Normal("foo.txt")));
assert_eq!(components.next(), None)

pub fn iter(&self) -> Iter<'_>

Produces an iterator over the path’s components viewed as str slices.

For more information about the particulars of how the path is separated into components, see components.

Examples

use camino::Utf8Path;

let mut it = Utf8Path::new("/tmp/foo.txt").iter();
assert_eq!(it.next(), Some(std::path::MAIN_SEPARATOR.to_string().as_str()));
assert_eq!(it.next(), Some("tmp"));
assert_eq!(it.next(), Some("foo.txt"));
assert_eq!(it.next(), None)

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

Queries the file system to get information about a file, directory, etc.

This function will traverse symbolic links to query information about the destination file.

This is an alias to fs::metadata.

Examples

use camino::Utf8Path;

let path = Utf8Path::new("/Minas/tirith");
let metadata = path.metadata().expect("metadata call failed");
println!("{:?}", metadata.file_type());

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

Queries the metadata about a file without following symlinks.

This is an alias to fs::symlink_metadata.

Examples

use camino::Utf8Path;

let path = Utf8Path::new("/Minas/tirith");
let metadata = path.symlink_metadata().expect("symlink_metadata call failed");
println!("{:?}", metadata.file_type());

pub fn canonicalize(&self) -> Result<PathBuf, Error>

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

This returns a PathBuf because even if a symlink is valid Unicode, its target may not be. For a version that returns a Utf8PathBuf, see canonicalize_utf8.

This is an alias to fs::canonicalize.

Examples

use camino::Utf8Path;
use std::path::PathBuf;

let path = Utf8Path::new("/foo/test/../test/bar.rs");
assert_eq!(path.canonicalize().unwrap(), PathBuf::from("/foo/test/bar.rs"));

pub fn canonicalize_utf8(&self) -> Result<Utf8PathBuf, Error>

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

This method attempts to convert the resulting PathBuf into a Utf8PathBuf. For a version that does not attempt to do this conversion, see canonicalize.

Errors

The I/O operation may return an error: see the fs::canonicalize documentation for more.

If the resulting path is not UTF-8, an io::Error is returned with the ErrorKind set to InvalidData and the payload set to a FromPathBufError.

Examples

use camino::{Utf8Path, Utf8PathBuf};

let path = Utf8Path::new("/foo/test/../test/bar.rs");
assert_eq!(path.canonicalize_utf8().unwrap(), Utf8PathBuf::from("/foo/test/bar.rs"));

pub fn read_link(&self) -> Result<PathBuf, Error>

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

This returns a PathBuf because even if a symlink is valid Unicode, its target may not be. For a version that returns a Utf8PathBuf, see read_link_utf8.

This is an alias to fs::read_link.

Examples

use camino::Utf8Path;

let path = Utf8Path::new("/laputa/sky_castle.rs");
let path_link = path.read_link().expect("read_link call failed");

pub fn read_link_utf8(&self) -> Result<Utf8PathBuf, Error>

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

This method attempts to convert the resulting PathBuf into a Utf8PathBuf. For a version that does not attempt to do this conversion, see read_link.

Errors

The I/O operation may return an error: see the fs::read_link documentation for more.

If the resulting path is not UTF-8, an io::Error is returned with the ErrorKind set to InvalidData and the payload set to a FromPathBufError.

Examples

use camino::Utf8Path;

let path = Utf8Path::new("/laputa/sky_castle.rs");
let path_link = path.read_link_utf8().expect("read_link call failed");

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

Returns an iterator over the entries within a directory.

The iterator will yield instances of io::Result<fs::DirEntry>. New errors may be encountered after an iterator is initially constructed.

This is an alias to fs::read_dir.

Examples

use camino::Utf8Path;

let path = Utf8Path::new("/laputa");
for entry in path.read_dir().expect("read_dir call failed") {
    if let Ok(entry) = entry {
        println!("{:?}", entry.path());
    }
}

pub fn read_dir_utf8(&self) -> Result<ReadDirUtf8, Error>

Returns an iterator over the entries within a directory.

The iterator will yield instances of io::Result<Utf8DirEntry>. New errors may be encountered after an iterator is initially constructed.

Errors

The I/O operation may return an error: see the fs::read_dir documentation for more.

If a directory entry is not UTF-8, an io::Error is returned with the ErrorKind set to InvalidData and the payload set to a FromPathBufError.

Examples

use camino::Utf8Path;

let path = Utf8Path::new("/laputa");
for entry in path.read_dir_utf8().expect("read_dir call failed") {
    if let Ok(entry) = entry {
        println!("{}", entry.path());
    }
}

pub fn exists(&self) -> bool

Returns true if the path points at an existing entity.

Warning: this method may be error-prone, consider using try_exists() instead! It also has a risk of introducing time-of-check to time-of-use (TOCTOU) bugs.

This function will traverse symbolic links to query information about the destination file. In case of broken symbolic links this will return false.

If you cannot access the directory containing the file, e.g., because of a permission error, this will return false.

Examples

use camino::Utf8Path;
assert!(!Utf8Path::new("does_not_exist.txt").exists());

See Also

This is a convenience function that coerces errors to false. If you want to check errors, call fs::metadata.

pub fn try_exists(&self) -> Result<bool, Error>

Returns Ok(true) if the path points at an existing entity.

This function will traverse symbolic links to query information about the destination file. In case of broken symbolic links this will return Ok(false).

As opposed to the exists() method, this one doesn’t silently ignore errors unrelated to the path not existing. (E.g. it will return Err(_) in case of permission denied on some of the parent directories.)

Note that while this avoids some pitfalls of the exists() method, it still can not prevent time-of-check to time-of-use (TOCTOU) bugs. You should only use it in scenarios where those bugs are not an issue.

Examples

use camino::Utf8Path;
assert!(!Utf8Path::new("does_not_exist.txt").try_exists().expect("Can't check existence of file does_not_exist.txt"));
assert!(Utf8Path::new("/root/secret_file.txt").try_exists().is_err());

pub fn is_file(&self) -> bool

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

This function will traverse symbolic links to query information about the destination file. In case of broken symbolic links this will return false.

If you cannot access the directory containing the file, e.g., because of a permission error, this will return false.

Examples

use camino::Utf8Path;
assert_eq!(Utf8Path::new("./is_a_directory/").is_file(), false);
assert_eq!(Utf8Path::new("a_file.txt").is_file(), true);

See Also

This is a convenience function that coerces errors to false. If you want to check errors, call fs::metadata and handle its Result. Then call fs::Metadata::is_file if it was Ok.

When the goal is simply to read from (or write to) the source, the most reliable way to test the source can be read (or written to) is to open it. Only using is_file can break workflows like diff <( prog_a ) on a Unix-like system for example. See fs::File::open or fs::OpenOptions::open for more information.

pub fn is_dir(&self) -> bool

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

This function will traverse symbolic links to query information about the destination file. In case of broken symbolic links this will return false.

If you cannot access the directory containing the file, e.g., because of a permission error, this will return false.

Examples

use camino::Utf8Path;
assert_eq!(Utf8Path::new("./is_a_directory/").is_dir(), true);
assert_eq!(Utf8Path::new("a_file.txt").is_dir(), false);

See Also

This is a convenience function that coerces errors to false. If you want to check errors, call fs::metadata and handle its Result. Then call fs::Metadata::is_dir if it was Ok.

pub fn is_symlink(&self) -> bool

Returns true if the path exists on disk and is pointing at a symbolic link.

This function will not traverse symbolic links. In case of a broken symbolic link this will also return true.

If you cannot access the directory containing the file, e.g., because of a permission error, this will return false.

Examples

use camino::Utf8Path;
use std::os::unix::fs::symlink;

let link_path = Utf8Path::new("link");
symlink("/origin_does_not_exist/", link_path).unwrap();
assert_eq!(link_path.is_symlink(), true);
assert_eq!(link_path.exists(), false);

See Also

This is a convenience function that coerces errors to false. If you want to check errors, call Utf8Path::symlink_metadata and handle its Result. Then call fs::Metadata::is_symlink if it was Ok.

Trait Implementations

impl AsRef<OsStr> for Utf8TempPath

fn as_ref(&self) -> &OsStr

Converts this type into a shared reference of the (usually inferred) input type.

impl AsRef<Path> for Utf8TempPath

fn as_ref(&self) -> &Path

Converts this type into a shared reference of the (usually inferred) input type.

impl AsRef<Utf8Path> for Utf8TempPath

fn as_ref(&self) -> &Utf8Path

Converts this type into a shared reference of the (usually inferred) input type.

impl AsRef<str> for Utf8TempPath

fn as_ref(&self) -> &str

Converts this type into a shared reference of the (usually inferred) input type.

impl Debug for Utf8TempPath

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

Formats the value using the given formatter.

impl Deref for Utf8TempPath

type Target = Utf8Path

The resulting type after dereferencing.

fn deref(&self) -> &Utf8Path

Dereferences the value.

impl From<Utf8PathPersistError> for Utf8TempPath

fn from(error: Utf8PathPersistError) -> Utf8TempPath

Converts to this type from the input type.