Struct anyhow_std::fs::Metadata

pub struct Metadata { /* private fields */ }

Wraps std::fs::Metadata to provide the path as error context

Implementations

impl Metadata

pub fn modified(&self) -> Result<SystemTime>

Extend std::fs::Metadata::modified to provide the path as error context

pub fn accessed(&self) -> Result<SystemTime>

Extend std::fs::Metadata::accessed to provide the path as error context

pub fn created(&self) -> Result<SystemTime>

Extend std::fs::Metadata::created to provide the path as error context

Methods from Deref<Target = Metadata>

pub fn file_type(&self) -> FileType

Returns the file type for this metadata.

Examples

fn main() -> std::io::Result<()> {
    use std::fs;

    let metadata = fs::metadata("foo.txt")?;

    println!("{:?}", metadata.file_type());
    Ok(())
}

pub fn is_dir(&self) -> bool

Returns true if this metadata is for a directory. The result is mutually exclusive to the result of Metadata::is_file, and will be false for symlink metadata obtained from symlink_metadata.

Examples

fn main() -> std::io::Result<()> {
    use std::fs;

    let metadata = fs::metadata("foo.txt")?;

    assert!(!metadata.is_dir());
    Ok(())
}

pub fn is_file(&self) -> bool

Returns true if this metadata is for a regular file. The result is mutually exclusive to the result of Metadata::is_dir, and will be false for symlink metadata obtained from symlink_metadata.

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 File::open or OpenOptions::open for more information.

Examples

use std::fs;

fn main() -> std::io::Result<()> {
    let metadata = fs::metadata("foo.txt")?;

    assert!(metadata.is_file());
    Ok(())
}

pub fn is_symlink(&self) -> bool

Returns true if this metadata is for a symbolic link.

Examples

use std::fs;
use std::path::Path;
use std::os::unix::fs::symlink;

fn main() -> std::io::Result<()> {
    let link_path = Path::new("link");
    symlink("/origin_does_not_exist/", link_path)?;

    let metadata = fs::symlink_metadata(link_path)?;

    assert!(metadata.is_symlink());
    Ok(())
}

pub fn len(&self) -> u64

Returns the size of the file, in bytes, this metadata is for.

Examples

use std::fs;

fn main() -> std::io::Result<()> {
    let metadata = fs::metadata("foo.txt")?;

    assert_eq!(0, metadata.len());
    Ok(())
}

pub fn permissions(&self) -> Permissions

Returns the permissions of the file this metadata is for.

Examples

use std::fs;

fn main() -> std::io::Result<()> {
    let metadata = fs::metadata("foo.txt")?;

    assert!(!metadata.permissions().readonly());
    Ok(())
}

pub fn modified(&self) -> Result<SystemTime, Error>

Returns the last modification time listed in this metadata.

The returned value corresponds to the mtime field of stat on Unix platforms and the ftLastWriteTime field on Windows platforms.

Errors

This field might not be available on all platforms, and will return an Err on platforms where it is not available.

Examples

use std::fs;

fn main() -> std::io::Result<()> {
    let metadata = fs::metadata("foo.txt")?;

    if let Ok(time) = metadata.modified() {
        println!("{time:?}");
    } else {
        println!("Not supported on this platform");
    }
    Ok(())
}

pub fn accessed(&self) -> Result<SystemTime, Error>

Returns the last access time of this metadata.

The returned value corresponds to the atime field of stat on Unix platforms and the ftLastAccessTime field on Windows platforms.

Note that not all platforms will keep this field update in a file’s metadata, for example Windows has an option to disable updating this time when files are accessed and Linux similarly has noatime.

Errors

This field might not be available on all platforms, and will return an Err on platforms where it is not available.

Examples

use std::fs;

fn main() -> std::io::Result<()> {
    let metadata = fs::metadata("foo.txt")?;

    if let Ok(time) = metadata.accessed() {
        println!("{time:?}");
    } else {
        println!("Not supported on this platform");
    }
    Ok(())
}

pub fn created(&self) -> Result<SystemTime, Error>

Returns the creation time listed in this metadata.

The returned value corresponds to the btime field of statx on Linux kernel starting from to 4.11, the birthtime field of stat on other Unix platforms, and the ftCreationTime field on Windows platforms.

Errors

This field might not be available on all platforms, and will return an Err on platforms or filesystems where it is not available.

Examples

use std::fs;

fn main() -> std::io::Result<()> {
    let metadata = fs::metadata("foo.txt")?;

    if let Ok(time) = metadata.created() {
        println!("{time:?}");
    } else {
        println!("Not supported on this platform or filesystem");
    }
    Ok(())
}

Trait Implementations

impl Debug for Metadata

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

Formats the value using the given formatter.

impl Deref for Metadata

type Target = Metadata

The resulting type after dereferencing.

fn deref(&self) -> &Self::Target

Dereferences the value.

impl From<(Metadata, PathBuf)> for Metadata

fn from(original: (Metadata, PathBuf)) -> Metadata

Converts to this type from the input type.

impl From<Metadata> for (Metadata, PathBuf)

fn from(original: Metadata) -> Self

Converts to this type from the input type.