find the root directory of a directory in rust

To find the root directory of a directory in Rust, we can use the std::path::Path and std::path::PathBuf structs from the standard library. The PathBuf struct allows us to create a path to a file or directory and manipulate it easily, while the Path struct provides methods for working with paths.

Here's an example code snippet that shows how to find the root directory of a directory:

main.rs
use std::path::{Path, PathBuf};

fn main() {
    let directory_path = Path::new("/home/user/my_directory");
    let root_directory_path = get_root_directory(&directory_path);
    println!("Root directory path: {:?}", root_directory_path);
}

fn get_root_directory(path: &Path) -> PathBuf {
    let mut current_path = path.to_path_buf();
    while let Some(parent) = current_path.parent() {
        current_path = parent.to_path_buf();
    }
    current_path
}
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In this example, we first create a Path object representing our directory path (/home/user/my_directory). We then pass it to the get_root_directory function, which takes a Path object as an argument and returns a PathBuf object that represents the root directory of the input path.

The get_root_directory function uses a loop to keep moving up the directory hierarchy until it reaches the root directory (i.e., a directory whose parent is itself). It does this by calling the parent method of the Path object until it returns None, indicating that the current path is the root directory. Finally, it returns the current path, which is a PathBuf object representing the root directory.