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//! Implementation based on [heim's](https://github.com/heim-rs/heim)
//! Unix disk usage.
use std::{
ffi::CString,
fs::File,
io::{self, BufRead, BufReader},
mem,
path::{Path, PathBuf},
str::FromStr,
};
use anyhow::bail;
use crate::app::data_harvester::disks::unix::{FileSystem, Usage};
/// Representation of partition details. Based on [`heim`](https://github.com/heim-rs/heim/tree/master).
pub(crate) struct Partition {
device: Option<String>,
mount_point: PathBuf,
fs_type: FileSystem,
}
impl Partition {
/// Returns the device name, if there is one.
#[inline]
pub fn device(&self) -> Option<&str> {
self.device.as_deref()
}
/// Returns the mount point for this partition.
#[inline]
pub fn mount_point(&self) -> &Path {
self.mount_point.as_path()
}
/// Returns the [`FileSystem`] of this partition.
#[inline]
pub fn fs_type(&self) -> &FileSystem {
&self.fs_type
}
/// Returns the device name for the partition.
pub fn get_device_name(&self) -> String {
if let Some(device) = self.device() {
// See if this disk is actually mounted elsewhere on Linux. This is a workaround properly map I/O
// in some cases (i.e. disk encryption, https://github.com/ClementTsang/bottom/issues/419).
if let Ok(path) = std::fs::read_link(device) {
if path.is_absolute() {
path.into_os_string()
.into_string()
.unwrap_or_else(|_| "Name Unavailable".to_string())
} else {
let mut combined_path = PathBuf::new();
combined_path.push(device);
combined_path.pop(); // Pop the current file...
combined_path.push(path);
if let Ok(canon_path) = std::fs::canonicalize(combined_path) {
// Resolve the local path into an absolute one...
canon_path
.into_os_string()
.into_string()
.unwrap_or_else(|_| "Name Unavailable".to_string())
} else {
device.to_owned()
}
}
} else {
device.to_owned()
}
} else {
"Name Unavailable".to_string()
}
}
/// Returns the usage stats for this partition.
pub fn usage(&self) -> anyhow::Result<Usage> {
let path = self
.mount_point
.to_str()
.ok_or_else(|| io::Error::from(io::ErrorKind::InvalidInput))
.and_then(|string| {
CString::new(string).map_err(|_| io::Error::from(io::ErrorKind::InvalidInput))
})
.map_err(|e| anyhow::anyhow!("invalid path: {e:?}"))?;
let mut vfs = mem::MaybeUninit::<libc::statvfs>::uninit();
// SAFETY: libc call, `path` is a valid C string and buf is a valid pointer to write to.
let result = unsafe { libc::statvfs(path.as_ptr(), vfs.as_mut_ptr()) };
if result == 0 {
// SAFETY: If result is 0, it succeeded, and vfs should be non-null.
let vfs = unsafe { vfs.assume_init() };
Ok(Usage::new(vfs))
} else {
Err(anyhow::anyhow!(
"statvfs had an issue getting info from {path:?}"
))
}
}
}
impl FromStr for Partition {
type Err = anyhow::Error;
fn from_str(line: &str) -> anyhow::Result<Partition> {
// Example: `/dev/sda3 /home ext4 rw,relatime,data=ordered 0 0`
let mut parts = line.splitn(5, ' ');
let device = match parts.next() {
Some("none") => None,
Some(device) => Some(device.to_string()),
None => {
bail!("missing device");
}
};
let mount_point = match parts.next() {
Some(point) => PathBuf::from(point),
None => {
bail!("missing mount point");
}
};
let fs_type = match parts.next() {
Some(fs) => FileSystem::from_str(fs)?,
_ => {
bail!("missing filesystem type");
}
};
Ok(Partition {
device,
mount_point,
fs_type,
})
}
}
#[allow(dead_code)]
/// Returns a [`Vec`] containing all partitions.
pub(crate) fn partitions() -> anyhow::Result<Vec<Partition>> {
const PROC_MOUNTS: &str = "/proc/mounts";
let mut results = vec![];
let mut reader = BufReader::new(File::open(PROC_MOUNTS)?);
let mut line = String::new();
// This saves us from doing a string allocation on each iteration compared to `lines()`.
while let Ok(bytes) = reader.read_line(&mut line) {
if bytes > 0 {
if let Ok(partition) = Partition::from_str(&line) {
results.push(partition);
}
line.clear();
} else {
break;
}
}
Ok(results)
}
/// Returns a [`Vec`] containing all *physical* partitions. This is defined by
/// [`FileSystem::is_physical()`].
pub(crate) fn physical_partitions() -> anyhow::Result<Vec<Partition>> {
const PROC_MOUNTS: &str = "/proc/mounts";
let mut results = vec![];
let mut reader = BufReader::new(File::open(PROC_MOUNTS)?);
let mut line = String::new();
// This saves us from doing a string allocation on each iteration compared to `lines()`.
while let Ok(bytes) = reader.read_line(&mut line) {
if bytes > 0 {
if let Ok(partition) = Partition::from_str(&line) {
if partition.fs_type().is_physical() {
results.push(partition);
}
}
line.clear();
} else {
break;
}
}
Ok(results)
}
|
