Struct std::fs::Permissions

pub struct Permissions(_);

Representation of the various permissions on a file.

This module only currently provides one bit of information, Permissions::readonly, which is exposed on all currently supported platforms. Unix-specific functionality, such as mode bits, is available through the PermissionsExt trait.

Implementations

impl Permissions

pub fn readonly(&self) -> bool

Returns true if these permissions describe a readonly (unwritable) file.

Examples

use std::fs::File;

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

    assert_eq!(false, metadata.permissions().readonly());
    Ok(())
}

pub fn set_readonly(&mut self, readonly: bool)

Modifies the readonly flag for this set of permissions. If the readonly argument is true, using the resulting Permission will update file permissions to forbid writing. Conversely, if it’s false, using the resulting Permission will update file permissions to allow writing.

This operation does not modify the filesystem. To modify the filesystem use the set_permissions function.

Examples

use std::fs::File;

fn main() -> std::io::Result<()> {
    let f = File::create("foo.txt")?;
    let metadata = f.metadata()?;
    let mut permissions = metadata.permissions();

    permissions.set_readonly(true);

    // filesystem doesn't change
    assert_eq!(false, metadata.permissions().readonly());

    // just this particular `permissions`.
    assert_eq!(true, permissions.readonly());
    Ok(())
}

Trait Implementations

impl Clone for Permissions

fn clone(&self) -> Permissions

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Permissions

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

Formats the value using the given formatter.

impl PartialEq<Permissions> for Permissions

fn eq(&self, other: &Permissions) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Permissions) -> bool

This method tests for !=.

impl PermissionsExt for Permissions

This is supported on Unix only.

fn mode(&self) -> u32

Returns the underlying raw st_mode bits that contain the standard Unix permissions for this file.

fn set_mode(&mut self, mode: u32)

Sets the underlying raw bits for this set of permissions.

fn from_mode(mode: u32) -> Permissions

Creates a new instance of Permissions from the given set of Unix permission bits.

impl Eq for Permissions

impl StructuralEq for Permissions

impl StructuralPartialEq for Permissions