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use super::MountInfo;
use std::{
fs::File,
io::{self, BufRead, BufReader},
path::Path,
str::FromStr,
};
pub struct MountIter<R> {
file: R,
buffer: String,
}
impl MountIter<BufReader<File>> {
pub fn new() -> io::Result<Self> { Self::new_from_file("/proc/mounts") }
pub fn new_from_file<P: AsRef<Path>>(path: P) -> io::Result<Self> {
Ok(Self::new_from_reader(BufReader::new(File::open(path)?)))
}
}
impl<R: BufRead> MountIter<R> {
pub fn new_from_reader(readable: R) -> Self {
Self { file: readable, buffer: String::with_capacity(512) }
}
pub fn source_mounted_at<D: AsRef<Path>, P: AsRef<Path>>(
source: D,
path: P,
) -> io::Result<bool> {
let source = source.as_ref();
let path = path.as_ref();
let mut is_found = false;
let mounts = MountIter::new()?;
for mount in mounts {
let mount = mount?;
if mount.source == source {
is_found = mount.dest == path;
break;
}
}
Ok(is_found)
}
}
impl<R: BufRead> Iterator for MountIter<R> {
type Item = io::Result<MountInfo>;
fn next(&mut self) -> Option<Self::Item> {
loop {
self.buffer.clear();
match self.file.read_line(&mut self.buffer) {
Ok(read) if read == 0 => return None,
Ok(_) => {
let line = self.buffer.trim_start();
if !(line.starts_with('#') || line.is_empty()) {
return Some(MountInfo::from_str(line));
}
}
Err(why) => return Some(Err(why)),
}
}
}
}