sgx_tstd/src/untrusted/path.rs

// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License..

use crate::untrusted::fs;
use crate::io;
use crate::path::Path;
use crate::path::PathBuf;

pub trait PathEx {
    fn metadata(&self) -> io::Result<fs::Metadata>;
    fn symlink_metadata(&self) -> io::Result<fs::Metadata>;
    fn canonicalize(&self) -> io::Result<PathBuf>;
    fn read_link(&self) -> io::Result<PathBuf>;
    fn read_dir(&self) -> io::Result<fs::ReadDir>;
    fn exists(&self) -> bool;
    fn is_file(&self) -> bool;
    fn is_dir(&self) -> bool;
}

impl PathEx for Path {
    /// Queries the file system to get information about a file, directory, etc.
    ///
    /// This function will traverse symbolic links to query information about the
    /// destination file.
    ///
    /// This is an alias to [`fs::metadata`].
    ///
    /// [`fs::metadata`]: ../fs/fn.metadata.html
    ///
    fn metadata(&self) -> io::Result<fs::Metadata> {
        fs::metadata(self)
    }

    /// Queries the metadata about a file without following symlinks.
    ///
    /// This is an alias to [`fs::symlink_metadata`].
    ///
    /// [`fs::symlink_metadata`]: ../fs/fn.symlink_metadata.html
    ///
    fn symlink_metadata(&self) -> io::Result<fs::Metadata> {
        fs::symlink_metadata(self)
    }

    /// Returns the canonical form of the path with all intermediate components
    /// normalized and symbolic links resolved.
    ///
    /// This is an alias to [`fs::canonicalize`].
    ///
    /// [`fs::canonicalize`]: ../fs/fn.canonicalize.html
    ///
    fn canonicalize(&self) -> io::Result<PathBuf> {
        fs::canonicalize(self)
    }

    /// Reads a symbolic link, returning the file that the link points to.
    ///
    /// This is an alias to [`fs::read_link`].
    ///
    /// [`fs::read_link`]: ../fs/fn.read_link.html
    ///
    fn read_link(&self) -> io::Result<PathBuf> {
        fs::read_link(self)
    }

    fn read_dir(&self) -> io::Result<fs::ReadDir> {
        fs::read_dir(self)
    }
    /// Returns whether the path points at an existing entity.
    ///
    /// This function will traverse symbolic links to query information about the
    /// destination file. In case of broken symbolic links this will return `false`.
    ///
    /// If you cannot access the directory containing the file, e.g. because of a
    /// permission error, this will return `false`.
    ///
    fn exists(&self) -> bool {
        fs::metadata(self).is_ok()
    }

    /// Returns whether the path exists on disk and is pointing at a regular file.
    ///
    /// This function will traverse symbolic links to query information about the
    /// destination file. In case of broken symbolic links this will return `false`.
    ///
    /// If you cannot access the directory containing the file, e.g. because of a
    /// permission error, this will return `false`.
    ///
    fn is_file(&self) -> bool {
        fs::metadata(self).map(|m| m.is_file()).unwrap_or(false)
    }

    /// Returns whether the path exists on disk and is pointing at a directory.
    ///
    /// This function will traverse symbolic links to query information about the
    /// destination file. In case of broken symbolic links this will return `false`.
    ///
    /// If you cannot access the directory containing the file, e.g. because of a
    /// permission error, this will return `false`.
    ///
    fn is_dir(&self) -> bool {
        fs::metadata(self).map(|m| m.is_dir()).unwrap_or(false)
    }
}