Struct otter_api_tests::fs::Metadata 1.0.0[−][src]
pub struct Metadata(_);
Expand description
Metadata information about a file.
This structure is returned from the metadata
or
symlink_metadata
function or method and represents known
metadata about a file such as its permissions, size, modification
times, etc.
Implementations
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(()) }
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(()) }
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(()) }
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(()) }
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(()) }
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 may 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(()) }
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 may 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(()) }
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 may 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
Returns the device ID of this file (if it is a special one). Read more
Returns the last access time of the file, in seconds since Unix Epoch. Read more
Returns the last modification time of the file, in seconds since Unix Epoch. Read more
Returns the last status change time of the file, in seconds since Unix Epoch. Read more
other methods of this trait are now preferred
Gain a reference to the underlying stat
structure which contains
the raw information returned by the OS. Read more
Returns the device ID that this file represents. Only relevant for special file. Read more
Returns the size of the file (if it is a regular file or a symbolic link) in bytes. Read more
Returns the last access time of the file, in seconds since Unix Epoch. Read more
Returns the last modification time of the file, in seconds since Unix Epoch. Read more
Returns the last status change time of the file, in seconds since Unix Epoch. Read more
Returns the “preferred” block size for efficient filesystem I/O. Read more
Auto Trait Implementations
impl RefUnwindSafe for Metadata
impl UnwindSafe for Metadata
Blanket Implementations
Mutably borrows from an owned value. Read more
pub fn into_any(self: Box<T, Global>) -> Box<dyn Any + 'static, Global>ⓘNotable traits for Box<R, Global>
impl<R> Read for Box<R, Global> where
R: Read + ?Sized, impl<W> Write for Box<W, Global> where
W: Write + ?Sized, impl<I, A> Iterator for Box<I, A> where
A: Allocator,
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;impl<F, A> Future for Box<F, A> where
A: Allocator + 'static,
F: Future + Unpin + ?Sized, type Output = <F as Future>::Output;
pub fn into_any(self: Box<T, Global>) -> Box<dyn Any + 'static, Global>ⓘNotable traits for Box<R, Global>
impl<R> Read for Box<R, Global> where
R: Read + ?Sized, impl<W> Write for Box<W, Global> where
W: Write + ?Sized, impl<I, A> Iterator for Box<I, A> where
A: Allocator,
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;impl<F, A> Future for Box<F, A> where
A: Allocator + 'static,
F: Future + Unpin + ?Sized, type Output = <F as Future>::Output;
Convert Box<dyn Trait>
(where Trait: Downcast
) to Box<dyn Any>
. Box<dyn Any>
can
then be further downcast
into Box<ConcreteType>
where ConcreteType
implements Trait
. Read more
pub fn into_any_rc(self: Rc<T>) -> Rc<dyn Any + 'static>
pub fn into_any_rc(self: Rc<T>) -> Rc<dyn Any + 'static>
Convert Rc<Trait>
(where Trait: Downcast
) to Rc<Any>
. Rc<Any>
can then be
further downcast
into Rc<ConcreteType>
where ConcreteType
implements Trait
. Read more
Convert &Trait
(where Trait: Downcast
) to &Any
. This is needed since Rust cannot
generate &Any
’s vtable from &Trait
’s. Read more
pub fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)
pub fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)
Convert &mut Trait
(where Trait: Downcast
) to &Any
. This is needed since Rust cannot
generate &mut Any
’s vtable from &mut Trait
’s. Read more
impl<A> DynCastExt for A
impl<A> DynCastExt for A
pub fn dyn_cast<T>(
self
) -> Result<<A as DynCastExtHelper<T>>::Target, <A as DynCastExtHelper<T>>::Source> where
T: ?Sized,
A: DynCastExtHelper<T>,
pub fn dyn_cast<T>(
self
) -> Result<<A as DynCastExtHelper<T>>::Target, <A as DynCastExtHelper<T>>::Source> where
T: ?Sized,
A: DynCastExtHelper<T>,
Use this to cast from one trait object type to another. Read more
pub fn dyn_upcast<T>(self) -> <A as DynCastExtAdvHelper<T, T>>::Target where
T: ?Sized,
A: DynCastExtAdvHelper<T, T, Source = <A as DynCastExtAdvHelper<T, T>>::Target>,
pub fn dyn_upcast<T>(self) -> <A as DynCastExtAdvHelper<T, T>>::Target where
T: ?Sized,
A: DynCastExtAdvHelper<T, T, Source = <A as DynCastExtAdvHelper<T, T>>::Target>,
Use this to upcast a trait to one of its supertraits. Read more
pub fn dyn_cast_adv<F, T>(
self
) -> Result<<A as DynCastExtAdvHelper<F, T>>::Target, <A as DynCastExtAdvHelper<F, T>>::Source> where
T: ?Sized,
A: DynCastExtAdvHelper<F, T>,
F: ?Sized,
pub fn dyn_cast_adv<F, T>(
self
) -> Result<<A as DynCastExtAdvHelper<F, T>>::Target, <A as DynCastExtAdvHelper<F, T>>::Source> where
T: ?Sized,
A: DynCastExtAdvHelper<F, T>,
F: ?Sized,
pub fn dyn_cast_with_config<C>(
self
) -> Result<<A as DynCastExtAdvHelper<<C as DynCastConfig>::Source, <C as DynCastConfig>::Target>>::Target, <A as DynCastExtAdvHelper<<C as DynCastConfig>::Source, <C as DynCastConfig>::Target>>::Source> where
C: DynCastConfig,
A: DynCastExtAdvHelper<<C as DynCastConfig>::Source, <C as DynCastConfig>::Target>,
pub fn dyn_cast_with_config<C>(
self
) -> Result<<A as DynCastExtAdvHelper<<C as DynCastConfig>::Source, <C as DynCastConfig>::Target>>::Target, <A as DynCastExtAdvHelper<<C as DynCastConfig>::Source, <C as DynCastConfig>::Target>>::Source> where
C: DynCastConfig,
A: DynCastExtAdvHelper<<C as DynCastConfig>::Source, <C as DynCastConfig>::Target>,
Use this to cast from one trait object type to another. With this method the type parameter is a config type that uniquely specifies which cast should be preformed. Read more
fn instrument(self, span: Span) -> Instrumented<Self>ⓘNotable traits for Instrumented<T>
impl<T> Future for Instrumented<T> where
T: Future, type Output = <T as Future>::Output;
[src]
fn instrument(self, span: Span) -> Instrumented<Self>ⓘNotable traits for Instrumented<T>
impl<T> Future for Instrumented<T> where
T: Future, type Output = <T as Future>::Output;
[src]Instruments this type with the provided Span
, returning an
Instrumented
wrapper. Read more
fn in_current_span(self) -> Instrumented<Self>ⓘNotable traits for Instrumented<T>
impl<T> Future for Instrumented<T> where
T: Future, type Output = <T as Future>::Output;
[src]
fn in_current_span(self) -> Instrumented<Self>ⓘNotable traits for Instrumented<T>
impl<T> Future for Instrumented<T> where
T: Future, type Output = <T as Future>::Output;
[src]pub fn vzip(self) -> V