pub struct PathBuf {
inner: OsString,
}
Expand description
An owned, mutable path (akin to String
).
This type provides methods like push
and set_extension
that mutate
the path in place. It also implements Deref
to Path
, meaning that
all methods on Path
slices are available on PathBuf
values as well.
More details about the overall approach can be found in the module documentation.
Examples
You can use push
to build up a PathBuf
from
components:
use std::path::PathBuf;
let mut path = PathBuf::new();
path.push(r"C:\");
path.push("windows");
path.push("system32");
path.set_extension("dll");
RunHowever, push
is best used for dynamic situations. This is a better way
to do this when you know all of the components ahead of time:
use std::path::PathBuf;
let path: PathBuf = [r"C:\", "windows", "system32.dll"].iter().collect();
RunWe can still do better than this! Since these are all strings, we can use
From::from
:
use std::path::PathBuf;
let path = PathBuf::from(r"C:\windows\system32.dll");
RunWhich method works best depends on what kind of situation you’re in.
Fields§
§inner: OsString
Implementations§
source§impl PathBuf
impl PathBuf
fn as_mut_vec(&mut self) -> &mut Vec<u8> ⓘ
1.44.0 · sourcepub fn with_capacity(capacity: usize) -> PathBuf
pub fn with_capacity(capacity: usize) -> PathBuf
Creates a new PathBuf
with a given capacity used to create the
internal OsString
. See with_capacity
defined on OsString
.
Examples
use std::path::PathBuf;
let mut path = PathBuf::with_capacity(10);
let capacity = path.capacity();
// This push is done without reallocating
path.push(r"C:\");
assert_eq!(capacity, path.capacity());
Runsourcepub fn push<P: AsRef<Path>>(&mut self, path: P)
pub fn push<P: AsRef<Path>>(&mut self, path: P)
Extends self
with path
.
If path
is absolute, it replaces the current path.
On Windows:
- if
path
has a root but no prefix (e.g.,\windows
), it replaces everything except for the prefix (if any) ofself
. - if
path
has a prefix but no root, it replacesself
. - if
self
has a verbatim prefix (e.g.\\?\C:\windows
) andpath
is not empty, the new path is normalized: all references to.
and..
are removed.
Consider using Path::join
if you need a new PathBuf
instead of
using this function on a cloned PathBuf
.
Examples
Pushing a relative path extends the existing path:
use std::path::PathBuf;
let mut path = PathBuf::from("/tmp");
path.push("file.bk");
assert_eq!(path, PathBuf::from("/tmp/file.bk"));
RunPushing an absolute path replaces the existing path:
use std::path::PathBuf;
let mut path = PathBuf::from("/tmp");
path.push("/etc");
assert_eq!(path, PathBuf::from("/etc"));
Runfn _push(&mut self, path: &Path)
sourcepub fn pop(&mut self) -> bool
pub fn pop(&mut self) -> bool
Truncates self
to self.parent
.
Returns false
and does nothing if self.parent
is None
.
Otherwise, returns true
.
Examples
use std::path::{Path, PathBuf};
let mut p = PathBuf::from("/spirited/away.rs");
p.pop();
assert_eq!(Path::new("/spirited"), p);
p.pop();
assert_eq!(Path::new("/"), p);
Runsourcepub fn set_file_name<S: AsRef<OsStr>>(&mut self, file_name: S)
pub fn set_file_name<S: AsRef<OsStr>>(&mut self, file_name: S)
Updates self.file_name
to file_name
.
If self.file_name
was None
, this is equivalent to pushing
file_name
.
Otherwise it is equivalent to calling pop
and then pushing
file_name
. The new path will be a sibling of the original path.
(That is, it will have the same parent.)
Examples
use std::path::PathBuf;
let mut buf = PathBuf::from("/");
assert!(buf.file_name() == None);
buf.set_file_name("foo.txt");
assert!(buf == PathBuf::from("/foo.txt"));
assert!(buf.file_name().is_some());
buf.set_file_name("bar.txt");
assert!(buf == PathBuf::from("/bar.txt"));
buf.set_file_name("baz");
assert!(buf == PathBuf::from("/baz"));
Runfn _set_file_name(&mut self, file_name: &OsStr)
sourcepub fn set_extension<S: AsRef<OsStr>>(&mut self, extension: S) -> bool
pub fn set_extension<S: AsRef<OsStr>>(&mut self, extension: S) -> bool
Updates self.extension
to Some(extension)
or to None
if
extension
is empty.
Returns false
and does nothing if self.file_name
is None
,
returns true
and updates the extension otherwise.
If self.extension
is None
, the extension is added; otherwise
it is replaced.
If extension
is the empty string, self.extension
will be None
afterwards, not Some("")
.
Caveats
The new extension
may contain dots and will be used in its entirety,
but only the part after the final dot will be reflected in
self.extension
.
If the file stem contains internal dots and extension
is empty, part
of the old file stem will be considered the new self.extension
.
See the examples below.
Examples
use std::path::{Path, PathBuf};
let mut p = PathBuf::from("/feel/the");
p.set_extension("force");
assert_eq!(Path::new("/feel/the.force"), p.as_path());
p.set_extension("dark.side");
assert_eq!(Path::new("/feel/the.dark.side"), p.as_path());
p.set_extension("cookie");
assert_eq!(Path::new("/feel/the.dark.cookie"), p.as_path());
p.set_extension("");
assert_eq!(Path::new("/feel/the.dark"), p.as_path());
p.set_extension("");
assert_eq!(Path::new("/feel/the"), p.as_path());
p.set_extension("");
assert_eq!(Path::new("/feel/the"), p.as_path());
Runfn _set_extension(&mut self, extension: &OsStr) -> bool
1.70.0 · sourcepub fn as_mut_os_string(&mut self) -> &mut OsString
pub fn as_mut_os_string(&mut self) -> &mut OsString
Yields a mutable reference to the underlying OsString
instance.
Examples
use std::path::{Path, PathBuf};
let mut path = PathBuf::from("/foo");
path.push("bar");
assert_eq!(path, Path::new("/foo/bar"));
// OsString's `push` does not add a separator.
path.as_mut_os_string().push("baz");
assert_eq!(path, Path::new("/foo/barbaz"));
Runsourcepub fn into_os_string(self) -> OsString
pub fn into_os_string(self) -> OsString
1.63.0 · sourcepub fn try_reserve(&mut self, additional: usize) -> Result<(), TryReserveError>
pub fn try_reserve(&mut self, additional: usize) -> Result<(), TryReserveError>
Invokes try_reserve
on the underlying instance of OsString
.
1.44.0 · sourcepub fn reserve_exact(&mut self, additional: usize)
pub fn reserve_exact(&mut self, additional: usize)
Invokes reserve_exact
on the underlying instance of OsString
.
1.63.0 · sourcepub fn try_reserve_exact(
&mut self,
additional: usize
) -> Result<(), TryReserveError>
pub fn try_reserve_exact( &mut self, additional: usize ) -> Result<(), TryReserveError>
Invokes try_reserve_exact
on the underlying instance of OsString
.
1.44.0 · sourcepub fn shrink_to_fit(&mut self)
pub fn shrink_to_fit(&mut self)
Invokes shrink_to_fit
on the underlying instance of OsString
.
Methods from Deref<Target = Path>§
fn as_u8_slice(&self) -> &[u8] ⓘ
1.70.0 · sourcepub fn as_mut_os_str(&mut self) -> &mut OsStr
pub fn as_mut_os_str(&mut self) -> &mut OsStr
sourcepub fn to_str(&self) -> Option<&str>
pub fn to_str(&self) -> Option<&str>
Yields a &str
slice if the Path
is valid unicode.
This conversion may entail doing a check for UTF-8 validity. Note that validation is performed because non-UTF-8 strings are perfectly valid for some OS.
Examples
use std::path::Path;
let path = Path::new("foo.txt");
assert_eq!(path.to_str(), Some("foo.txt"));
Runsourcepub fn to_string_lossy(&self) -> Cow<'_, str>
pub fn to_string_lossy(&self) -> Cow<'_, str>
Converts a Path
to a Cow<str>
.
Any non-Unicode sequences are replaced with
U+FFFD REPLACEMENT CHARACTER
.
Examples
Calling to_string_lossy
on a Path
with valid unicode:
use std::path::Path;
let path = Path::new("foo.txt");
assert_eq!(path.to_string_lossy(), "foo.txt");
RunHad path
contained invalid unicode, the to_string_lossy
call might
have returned "fo�.txt"
.
sourcepub fn to_path_buf(&self) -> PathBuf
pub fn to_path_buf(&self) -> PathBuf
sourcepub fn is_absolute(&self) -> bool
pub fn is_absolute(&self) -> bool
Returns true
if the Path
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
andhas_root
are equivalent. -
On Windows, a path is absolute if it has a prefix and starts with the root:
c:\windows
is absolute, whilec:temp
and\temp
are not.
Examples
use std::path::Path;
assert!(!Path::new("foo.txt").is_absolute());
Runsourcepub fn is_relative(&self) -> bool
pub fn is_relative(&self) -> bool
Returns true
if the Path
is relative, i.e., not absolute.
See is_absolute
’s documentation for more details.
Examples
use std::path::Path;
assert!(Path::new("foo.txt").is_relative());
Runfn prefix(&self) -> Option<Prefix<'_>>
sourcepub fn has_root(&self) -> bool
pub fn has_root(&self) -> bool
Returns true
if the Path
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 notc:windows
- has any non-disk prefix, e.g.,
\\server\share
- has no prefix and begins with a separator, e.g.,
Examples
use std::path::Path;
assert!(Path::new("/etc/passwd").has_root());
Runsourcepub fn parent(&self) -> Option<&Path>
pub fn parent(&self) -> Option<&Path>
Returns the Path
without its final component, if there is one.
This means it returns Some("")
for relative paths with one component.
Returns None
if the path terminates in a root or prefix, or if it’s
the empty string.
Examples
use std::path::Path;
let path = Path::new("/foo/bar");
let parent = path.parent().unwrap();
assert_eq!(parent, Path::new("/foo"));
let grand_parent = parent.parent().unwrap();
assert_eq!(grand_parent, Path::new("/"));
assert_eq!(grand_parent.parent(), None);
let relative_path = Path::new("foo/bar");
let parent = relative_path.parent();
assert_eq!(parent, Some(Path::new("foo")));
let grand_parent = parent.and_then(Path::parent);
assert_eq!(grand_parent, Some(Path::new("")));
let great_grand_parent = grand_parent.and_then(Path::parent);
assert_eq!(great_grand_parent, None);
Run1.28.0 · sourcepub fn ancestors(&self) -> Ancestors<'_> ⓘ
pub fn ancestors(&self) -> Ancestors<'_> ⓘ
Produces an iterator over Path
and its ancestors.
The iterator will yield the Path
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 std::path::Path;
let mut ancestors = Path::new("/foo/bar").ancestors();
assert_eq!(ancestors.next(), Some(Path::new("/foo/bar")));
assert_eq!(ancestors.next(), Some(Path::new("/foo")));
assert_eq!(ancestors.next(), Some(Path::new("/")));
assert_eq!(ancestors.next(), None);
let mut ancestors = Path::new("../foo/bar").ancestors();
assert_eq!(ancestors.next(), Some(Path::new("../foo/bar")));
assert_eq!(ancestors.next(), Some(Path::new("../foo")));
assert_eq!(ancestors.next(), Some(Path::new("..")));
assert_eq!(ancestors.next(), Some(Path::new("")));
assert_eq!(ancestors.next(), None);
Runsourcepub fn file_name(&self) -> Option<&OsStr>
pub fn file_name(&self) -> Option<&OsStr>
Returns the final component of the Path
, 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 std::path::Path;
use std::ffi::OsStr;
assert_eq!(Some(OsStr::new("bin")), Path::new("/usr/bin/").file_name());
assert_eq!(Some(OsStr::new("foo.txt")), Path::new("tmp/foo.txt").file_name());
assert_eq!(Some(OsStr::new("foo.txt")), Path::new("foo.txt/.").file_name());
assert_eq!(Some(OsStr::new("foo.txt")), Path::new("foo.txt/.//").file_name());
assert_eq!(None, Path::new("foo.txt/..").file_name());
assert_eq!(None, Path::new("/").file_name());
Run1.7.0 · sourcepub fn strip_prefix<P>(&self, base: P) -> Result<&Path, StripPrefixError>where
P: AsRef<Path>,
pub fn strip_prefix<P>(&self, base: P) -> Result<&Path, StripPrefixError>where P: AsRef<Path>,
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 std::path::{Path, PathBuf};
let path = Path::new("/test/haha/foo.txt");
assert_eq!(path.strip_prefix("/"), Ok(Path::new("test/haha/foo.txt")));
assert_eq!(path.strip_prefix("/test"), Ok(Path::new("haha/foo.txt")));
assert_eq!(path.strip_prefix("/test/"), Ok(Path::new("haha/foo.txt")));
assert_eq!(path.strip_prefix("/test/haha/foo.txt"), Ok(Path::new("")));
assert_eq!(path.strip_prefix("/test/haha/foo.txt/"), Ok(Path::new("")));
assert!(path.strip_prefix("test").is_err());
assert!(path.strip_prefix("/haha").is_err());
let prefix = PathBuf::from("/test/");
assert_eq!(path.strip_prefix(prefix), Ok(Path::new("haha/foo.txt")));
Runfn _strip_prefix(&self, base: &Path) -> Result<&Path, StripPrefixError>
sourcepub fn starts_with<P: AsRef<Path>>(&self, base: P) -> bool
pub fn starts_with<P: AsRef<Path>>(&self, base: P) -> bool
Determines whether base
is a prefix of self
.
Only considers whole path components to match.
Examples
use std::path::Path;
let path = Path::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!(!Path::new("/etc/foo.rs").starts_with("/etc/foo"));
Runfn _starts_with(&self, base: &Path) -> bool
sourcepub fn ends_with<P: AsRef<Path>>(&self, child: P) -> bool
pub fn ends_with<P: AsRef<Path>>(&self, child: P) -> bool
Determines whether child
is a suffix of self
.
Only considers whole path components to match.
Examples
use std::path::Path;
let path = Path::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
Runfn _ends_with(&self, child: &Path) -> bool
sourcepub fn file_stem(&self) -> Option<&OsStr>
pub fn file_stem(&self) -> Option<&OsStr>
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 std::path::Path;
assert_eq!("foo", Path::new("foo.rs").file_stem().unwrap());
assert_eq!("foo.tar", Path::new("foo.tar.gz").file_stem().unwrap());
RunSee Also
This method is similar to Path::file_prefix
, which extracts the portion of the file name
before the first .
sourcepub fn file_prefix(&self) -> Option<&OsStr>
🔬This is a nightly-only experimental API. (path_file_prefix
#86319)
pub fn file_prefix(&self) -> Option<&OsStr>
path_file_prefix
#86319)Extracts the prefix of self.file_name
.
The prefix is:
None
, if there is no file name;- The entire file name if there is no embedded
.
; - The portion of the file name before the first non-beginning
.
; - The entire file name if the file name begins with
.
and has no other.
s within; - The portion of the file name before the second
.
if the file name begins with.
Examples
use std::path::Path;
assert_eq!("foo", Path::new("foo.rs").file_prefix().unwrap());
assert_eq!("foo", Path::new("foo.tar.gz").file_prefix().unwrap());
RunSee Also
This method is similar to Path::file_stem
, which extracts the portion of the file name
before the last .
sourcepub fn extension(&self) -> Option<&OsStr>
pub fn extension(&self) -> Option<&OsStr>
Extracts the extension (without the leading dot) 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 std::path::Path;
assert_eq!("rs", Path::new("foo.rs").extension().unwrap());
assert_eq!("gz", Path::new("foo.tar.gz").extension().unwrap());
Runsourcepub fn join<P: AsRef<Path>>(&self, path: P) -> PathBuf
pub fn join<P: AsRef<Path>>(&self, path: P) -> PathBuf
Creates an owned PathBuf
with path
adjoined to self
.
If path
is absolute, it replaces the current path.
See PathBuf::push
for more details on what it means to adjoin a path.
Examples
use std::path::{Path, PathBuf};
assert_eq!(Path::new("/etc").join("passwd"), PathBuf::from("/etc/passwd"));
assert_eq!(Path::new("/etc").join("/bin/sh"), PathBuf::from("/bin/sh"));
Runfn _join(&self, path: &Path) -> PathBuf
sourcepub fn with_file_name<S: AsRef<OsStr>>(&self, file_name: S) -> PathBuf
pub fn with_file_name<S: AsRef<OsStr>>(&self, file_name: S) -> PathBuf
Creates an owned PathBuf
like self
but with the given file name.
See PathBuf::set_file_name
for more details.
Examples
use std::path::{Path, PathBuf};
let path = Path::new("/tmp/foo.png");
assert_eq!(path.with_file_name("bar"), PathBuf::from("/tmp/bar"));
assert_eq!(path.with_file_name("bar.txt"), PathBuf::from("/tmp/bar.txt"));
let path = Path::new("/tmp");
assert_eq!(path.with_file_name("var"), PathBuf::from("/var"));
Runfn _with_file_name(&self, file_name: &OsStr) -> PathBuf
sourcepub fn with_extension<S: AsRef<OsStr>>(&self, extension: S) -> PathBuf
pub fn with_extension<S: AsRef<OsStr>>(&self, extension: S) -> PathBuf
Creates an owned PathBuf
like self
but with the given extension.
See PathBuf::set_extension
for more details.
Examples
use std::path::{Path, PathBuf};
let path = Path::new("foo.rs");
assert_eq!(path.with_extension("txt"), PathBuf::from("foo.txt"));
let path = Path::new("foo.tar.gz");
assert_eq!(path.with_extension(""), PathBuf::from("foo.tar"));
assert_eq!(path.with_extension("xz"), PathBuf::from("foo.tar.xz"));
assert_eq!(path.with_extension("").with_extension("txt"), PathBuf::from("foo.txt"));
Runfn _with_extension(&self, extension: &OsStr) -> PathBuf
sourcepub fn components(&self) -> Components<'_> ⓘ
pub fn components(&self) -> Components<'_> ⓘ
Produces an iterator over the Component
s of the path.
When parsing the path, there is a small amount of normalization:
-
Repeated separators are ignored, so
a/b
anda//b
both havea
andb
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/.
anda/b
all havea
andb
as components, but./a/b
starts with an additionalCurDir
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 std::path::{Path, Component};
use std::ffi::OsStr;
let mut components = Path::new("/tmp/foo.txt").components();
assert_eq!(components.next(), Some(Component::RootDir));
assert_eq!(components.next(), Some(Component::Normal(OsStr::new("tmp"))));
assert_eq!(components.next(), Some(Component::Normal(OsStr::new("foo.txt"))));
assert_eq!(components.next(), None)
Runsourcepub fn iter(&self) -> Iter<'_> ⓘ
pub fn iter(&self) -> Iter<'_> ⓘ
Produces an iterator over the path’s components viewed as OsStr
slices.
For more information about the particulars of how the path is separated
into components, see components
.
Examples
use std::path::{self, Path};
use std::ffi::OsStr;
let mut it = Path::new("/tmp/foo.txt").iter();
assert_eq!(it.next(), Some(OsStr::new(&path::MAIN_SEPARATOR.to_string())));
assert_eq!(it.next(), Some(OsStr::new("tmp")));
assert_eq!(it.next(), Some(OsStr::new("foo.txt")));
assert_eq!(it.next(), None)
Runsourcepub fn display(&self) -> Display<'_>
pub fn display(&self) -> Display<'_>
Returns an object that implements Display
for safely printing paths
that may contain non-Unicode data. This may perform lossy conversion,
depending on the platform. If you would like an implementation which
escapes the path please use Debug
instead.
Examples
use std::path::Path;
let path = Path::new("/tmp/foo.rs");
println!("{}", path.display());
Run1.5.0 · sourcepub fn metadata(&self) -> Result<Metadata>
pub fn metadata(&self) -> Result<Metadata>
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 std::path::Path;
let path = Path::new("/Minas/tirith");
let metadata = path.metadata().expect("metadata call failed");
println!("{:?}", metadata.file_type());
Run1.5.0 · sourcepub fn symlink_metadata(&self) -> Result<Metadata>
pub fn symlink_metadata(&self) -> Result<Metadata>
Queries the metadata about a file without following symlinks.
This is an alias to fs::symlink_metadata
.
Examples
use std::path::Path;
let path = Path::new("/Minas/tirith");
let metadata = path.symlink_metadata().expect("symlink_metadata call failed");
println!("{:?}", metadata.file_type());
Run1.5.0 · sourcepub fn canonicalize(&self) -> Result<PathBuf>
pub fn canonicalize(&self) -> Result<PathBuf>
Returns the canonical, absolute form of the path with all intermediate components normalized and symbolic links resolved.
This is an alias to fs::canonicalize
.
Examples
use std::path::{Path, PathBuf};
let path = Path::new("/foo/test/../test/bar.rs");
assert_eq!(path.canonicalize().unwrap(), PathBuf::from("/foo/test/bar.rs"));
Run1.5.0 · sourcepub fn read_link(&self) -> Result<PathBuf>
pub fn read_link(&self) -> Result<PathBuf>
Reads a symbolic link, returning the file that the link points to.
This is an alias to fs::read_link
.
Examples
use std::path::Path;
let path = Path::new("/laputa/sky_castle.rs");
let path_link = path.read_link().expect("read_link call failed");
Run1.5.0 · sourcepub fn read_dir(&self) -> Result<ReadDir>
pub fn read_dir(&self) -> Result<ReadDir>
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 std::path::Path;
let path = Path::new("/laputa");
for entry in path.read_dir().expect("read_dir call failed") {
if let Ok(entry) = entry {
println!("{:?}", entry.path());
}
}
Run1.5.0 · sourcepub fn exists(&self) -> bool
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.
If you cannot access the metadata of the file, e.g. because of a
permission error or broken symbolic links, this will return false
.
Examples
use std::path::Path;
assert!(!Path::new("does_not_exist.txt").exists());
RunSee Also
This is a convenience function that coerces errors to false. If you want to
check errors, call Path::try_exists
.
1.63.0 · sourcepub fn try_exists(&self) -> Result<bool>
pub fn try_exists(&self) -> Result<bool>
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)
.
Path::exists()
only checks whether or not a path was both found and readable. By
contrast, try_exists
will return Ok(true)
or Ok(false)
, respectively, if the path
was verified to exist or not exist. If its existence can neither be confirmed nor
denied, it will propagate an Err(_)
instead. This can be the case if e.g. listing
permission is denied on one 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 std::path::Path;
assert!(!Path::new("does_not_exist.txt").try_exists().expect("Can't check existence of file does_not_exist.txt"));
assert!(Path::new("/root/secret_file.txt").try_exists().is_err());
Run1.5.0 · sourcepub fn is_file(&self) -> bool
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.
If you cannot access the metadata of the file, e.g. because of a
permission error or broken symbolic links, this will return false
.
Examples
use std::path::Path;
assert_eq!(Path::new("./is_a_directory/").is_file(), false);
assert_eq!(Path::new("a_file.txt").is_file(), true);
RunSee 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.
1.5.0 · sourcepub fn is_dir(&self) -> bool
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.
If you cannot access the metadata of the file, e.g. because of a
permission error or broken symbolic links, this will return false
.
Examples
use std::path::Path;
assert_eq!(Path::new("./is_a_directory/").is_dir(), true);
assert_eq!(Path::new("a_file.txt").is_dir(), false);
RunSee 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
.
1.58.0 · sourcepub fn is_symlink(&self) -> bool
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 std::path::Path;
use std::os::unix::fs::symlink;
let link_path = Path::new("link");
symlink("/origin_does_not_exist/", link_path).unwrap();
assert_eq!(link_path.is_symlink(), true);
assert_eq!(link_path.exists(), false);
RunSee Also
This is a convenience function that coerces errors to false. If you want to
check errors, call fs::symlink_metadata
and handle its Result
. Then call
fs::Metadata::is_symlink
if it was Ok
.
Trait Implementations§
source§impl<P: AsRef<Path>> Extend<P> for PathBuf
impl<P: AsRef<Path>> Extend<P> for PathBuf
source§fn extend<I: IntoIterator<Item = P>>(&mut self, iter: I)
fn extend<I: IntoIterator<Item = P>>(&mut self, iter: I)
source§fn extend_one(&mut self, p: P)
fn extend_one(&mut self, p: P)
extend_one
#72631)