Struct walkdir::Error

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pub struct Error { /* private fields */ }
Expand description

An error produced by recursively walking a directory.

This error type is a light wrapper around std::io::Error. In particular, it adds the following information:

  • The depth at which the error occurred in the file tree, relative to the root.
  • The path, if any, associated with the IO error.
  • An indication that a loop occurred when following symbolic links. In this case, there is no underlying IO error.

To maintain good ergonomics, this type has a impl From<Error> for std::io::Error defined which preserves the original context. This allows you to use an io::Result with methods in this crate if you don’t care about accessing the underlying error data in a structured form.

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impl Error

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pub fn path(&self) -> Option<&Path>

Returns the path associated with this error if one exists.

For example, if an error occurred while opening a directory handle, the error will include the path passed to std::fs::read_dir.

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pub fn loop_ancestor(&self) -> Option<&Path>

Returns the path at which a cycle was detected.

If no cycle was detected, None is returned.

A cycle is detected when a directory entry is equivalent to one of its ancestors.

To get the path to the child directory entry in the cycle, use the path method.

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pub fn depth(&self) -> usize

Returns the depth at which this error occurred relative to the root.

The smallest depth is 0 and always corresponds to the path given to the new function on WalkDir. Its direct descendents have depth 1, and their descendents have depth 2, and so on.

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pub fn io_error(&self) -> Option<&Error>

Inspect the original io::Error if there is one.

None is returned if the Error doesn’t correspond to an io::Error. This might happen, for example, when the error was produced because a cycle was found in the directory tree while following symbolic links.

This method returns a borrowed value that is bound to the lifetime of the Error. To obtain an owned value, the into_io_error can be used instead.

This is the original io::Error and is not the same as impl From<Error> for std::io::Error which contains additional context about the error.

§Example
use std::io;
use std::path::Path;

use walkdir::WalkDir;

for entry in WalkDir::new("foo") {
    match entry {
        Ok(entry) => println!("{}", entry.path().display()),
        Err(err) => {
            let path = err.path().unwrap_or(Path::new("")).display();
            println!("failed to access entry {}", path);
            if let Some(inner) = err.io_error() {
                match inner.kind() {
                    io::ErrorKind::InvalidData => {
                        println!(
                            "entry contains invalid data: {}",
                            inner)
                    }
                    io::ErrorKind::PermissionDenied => {
                        println!(
                            "Missing permission to read entry: {}",
                            inner)
                    }
                    _ => {
                        println!(
                            "Unexpected error occurred: {}",
                            inner)
                    }
                }
            }
        }
    }
}
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pub fn into_io_error(self) -> Option<Error>

Similar to io_error except consumes self to convert to the original io::Error if one exists.

Trait Implementations§

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impl Debug for Error

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

Formats the value using the given formatter. Read more
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impl Display for Error

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

Formats the value using the given formatter. Read more
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impl Error for Error

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fn description(&self) -> &str

👎Deprecated since 1.42.0: use the Display impl or to_string()
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fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0: replaced by Error::source, which can support downcasting
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fn source(&self) -> Option<&(dyn Error + 'static)>

The lower-level source of this error, if any. Read more
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fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)
Provides type based access to context intended for error reports. Read more
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impl From<Error> for Error

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fn from(walk_err: Error) -> Error

Convert the Error to an io::Error, preserving the original Error as the “inner error”. Note that this also makes the display of the error include the context.

This is different from into_io_error which returns the original io::Error.

Auto Trait Implementations§

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impl !RefUnwindSafe for Error

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impl Send for Error

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impl Sync for Error

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impl Unpin for Error

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impl !UnwindSafe for Error

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> ToString for T
where T: Display + ?Sized,

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default fn to_string(&self) -> String

Converts the given value to a String. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.