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use partition_identity::PartitionID;
use std::char;
use std::ffi::OsString;
use std::fmt::{self, Display, Formatter};
use std::io::{self, Error, ErrorKind};
use std::os::unix::ffi::OsStringExt;
use std::path::PathBuf;
use std::str::FromStr;
#[derive(Debug, Default, Clone, Hash, Eq, PartialEq)]
pub struct MountInfo {
pub source: PathBuf,
pub dest: PathBuf,
pub fstype: String,
pub options: Vec<String>,
pub dump: i32,
pub pass: i32,
}
impl Display for MountInfo {
fn fmt(&self, fmt: &mut Formatter) -> fmt::Result {
write!(
fmt,
"{} {} {} {} {} {}",
self.source.display(),
self.dest.display(),
self.fstype,
if self.options.is_empty() {
"defaults".into()
} else {
self.options.join(",")
},
self.dump,
self.pass
)
}
}
impl FromStr for MountInfo {
type Err = io::Error;
fn from_str(line: &str) -> Result<Self, Self::Err> {
let mut parts = line.split_whitespace();
fn map_err(why: &'static str) -> io::Error {
Error::new(ErrorKind::InvalidData, why)
}
let source = parts.next().ok_or_else(|| map_err("missing source"))?;
let dest = parts.next().ok_or_else(|| map_err("missing dest"))?;
let fstype = parts.next().ok_or_else(|| map_err("missing type"))?;
let options = parts.next().ok_or_else(|| map_err("missing options"))?;
let dump = parts.next().map_or(Ok(0), |value| {
value.parse::<i32>().map_err(|_| map_err("dump value is not a number"))
})?;
let pass = parts.next().map_or(Ok(0), |value| {
value.parse::<i32>().map_err(|_| map_err("pass value is not a number"))
})?;
let path = Self::parse_value(source)?;
let path = path.to_str().ok_or_else(|| map_err("non-utf8 paths are unsupported"))?;
let source = if path.starts_with("/dev/disk/by-") {
Self::fetch_from_disk_by_path(path)?
} else {
PathBuf::from(path)
};
let path = Self::parse_value(dest)?;
let path = path.to_str().ok_or_else(|| map_err("non-utf8 paths are unsupported"))?;
let dest = PathBuf::from(path);
Ok(MountInfo {
source,
dest,
fstype: fstype.to_owned(),
options: options.split(',').map(String::from).collect(),
dump,
pass,
})
}
}
impl MountInfo {
#[deprecated]
pub fn parse_line(line: &str) -> io::Result<MountInfo> {
line.parse::<Self>()
}
fn fetch_from_disk_by_path(path: &str) -> io::Result<PathBuf> {
PartitionID::from_disk_by_path(path)
.map_err(|why| Error::new(ErrorKind::InvalidData, format!("{}: {}", path, why)))?
.get_device_path()
.ok_or_else(|| {
Error::new(ErrorKind::NotFound, format!("device path for {} was not found", path))
})
}
fn parse_value(value: &str) -> io::Result<OsString> {
let mut ret = Vec::new();
let mut bytes = value.bytes();
while let Some(b) = bytes.next() {
match b {
b'\\' => {
let mut code = 0;
for _i in 0..3 {
if let Some(b) = bytes.next() {
code *= 8;
code += u32::from_str_radix(&(b as char).to_string(), 8)
.map_err(|err| Error::new(ErrorKind::Other, err))?;
} else {
return Err(Error::new(ErrorKind::Other, "truncated octal code"));
}
}
ret.push(code as u8);
}
_ => {
ret.push(b);
}
}
}
Ok(OsString::from_vec(ret))
}
}