[−][src]Trait openat_ext::OpenatDirExt

pub trait OpenatDirExt {
    fn open_file_optional<P: AsPath>(&self, p: P) -> Result<Option<File>>;

    fn remove_file_optional<P: AsPath>(&self, p: P) -> Result<()>;

    fn sub_dir_optional<P: AsPath>(&self, p: P) -> Result<Option<Dir>>;

    fn metadata_optional<P: AsPath>(&self, p: P) -> Result<Option<Metadata>>;

    fn get_file_type(&self, e: &Entry) -> Result<SimpleType>;

    fn exists<P: AsPath>(&self, p: P) -> Result<bool>;

    fn ensure_dir<P: AsPath>(&self, p: P, mode: mode_t) -> Result<()>;

    fn ensure_dir_all<P: AsPath>(&self, p: P, mode: mode_t) -> Result<()>;

    fn new_file_writer<'a, P: AsRef<Path>>(
        &'a self, 
        destname: P, 
        mode: mode_t
    ) -> Result<FileWriter<'_>>;

    fn write_file_with<P: AsRef<Path>, F, T, E>(
        &self, 
        destname: P, 
        mode: mode_t, 
        f: F
    ) -> Result<T, E>
    where
        F: Fn(&mut BufWriter<File>) -> Result<T, E>,
        E: From<Error>,
    { ... }

    fn write_file_with_sync<P: AsRef<Path>, F, T, E>(
        &self, 
        destname: P, 
        mode: mode_t, 
        f: F
    ) -> Result<T, E>
    where
        F: Fn(&mut BufWriter<File>) -> Result<T, E>,
        E: From<Error>,
    { ... }

    fn write_file_contents<P: AsRef<Path>, C: AsRef<[u8]>>(
        &self, 
        destname: P, 
        mode: mode_t, 
        contents: C
    ) -> Result<()> { ... }
}

Helper functions for openat::Dir

Required methods

fn open_file_optional<P: AsPath>(&self, p: P) -> Result<Option<File>>

Checking for nonexistent files (ENOENT) is by far the most common case of inspecting error codes in Unix. Rust has a nice Option<> type, so this helper makes use of it and returns Ok(None) for nonexistent files. All other errors are Err, and extant files are Ok(Some<file>)) of course.

fn remove_file_optional<P: AsPath>(&self, p: P) -> Result<()>

Remove a file from the given directory.

fn sub_dir_optional<P: AsPath>(&self, p: P) -> Result<Option<Dir>>

Like open_file_optional() except opens a directory via openat::dir::sub_dir.

fn metadata_optional<P: AsPath>(&self, p: P) -> Result<Option<Metadata>>

Like metadata() except returns Ok(None) for nonexistent paths.

fn get_file_type(&self, e: &Entry) -> Result<SimpleType>

On modern filesystems the directory entry contains the type; if available, return it. Otherwise invoke stat().

fn exists<P: AsPath>(&self, p: P) -> Result<bool>

Returns true iff file exists (may be a directory or symlink). Symbolic links are not followed.

fn ensure_dir<P: AsPath>(&self, p: P, mode: mode_t) -> Result<()>

Create a directory but don't error if it already exists.

fn ensure_dir_all<P: AsPath>(&self, p: P, mode: mode_t) -> Result<()>

Create directory and all parents as necessary; no error is returned if directory already exists.

fn new_file_writer<'a, P: AsRef<Path>>(
    &'a self,
    destname: P,
    mode: mode_t
) -> Result<FileWriter<'_>>

Create a FileWriter which provides a std::io::BufWriter and then atomically creates the file at the destination, renaming it over an existing one if necessary.

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Provided methods

fn write_file_with<P: AsRef<Path>, F, T, E>(
    &self,
    destname: P,
    mode: mode_t,
    f: F
) -> Result<T, E> where
    F: Fn(&mut BufWriter<File>) -> Result<T, E>,
    E: From<Error>, 

Atomically create or replace the destination file, calling the provided function to generate the contents. Note that the contents of the file will not be explicitly sync'd to disk; if you want to do so you need to invoke writer.flush()?; writer.get_ref().sync_all() for example.

fn write_file_with_sync<P: AsRef<Path>, F, T, E>(
    &self,
    destname: P,
    mode: mode_t,
    f: F
) -> Result<T, E> where
    F: Fn(&mut BufWriter<File>) -> Result<T, E>,
    E: From<Error>, 

Like write_file_with() but explicitly synchronizes the target to disk.

fn write_file_contents<P: AsRef<Path>, C: AsRef<[u8]>>(
    &self,
    destname: P,
    mode: mode_t,
    contents: C
) -> Result<()>

Atomically create or replace the destination file with the provided contents.

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Implementations on Foreign Types

impl OpenatDirExt for Dir[src]

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Implementors

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