container-pid 2.0.0

Resolve container names to their PIDs
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43

use std::env;
use std::ffi::OsString;
use std::fs;
use std::io::ErrorKind;
use std::path::PathBuf;

use crate::Container;
use crate::Error;
use crate::RawPid;

#[derive(Clone, Debug)]
pub(crate) struct ProcessId {}

/// TODO make this configureable?
fn get_path() -> PathBuf {
    PathBuf::from(&env::var_os("CNTR_PROC").unwrap_or_else(|| OsString::from("/proc")))
}

impl Container for ProcessId {
    fn lookup(&self, container_id: &str) -> Result<RawPid, Error> {
        let pid = container_id
            .parse::<RawPid>()
            .map_err(|source| Error::InvalidProcessId(container_id.to_string(), source))?;

        let proc_path = get_path().join(pid.to_string());
        match fs::metadata(&proc_path) {
            Err(e) => {
                if e.kind() == ErrorKind::NotFound {
                    Err(Error::NoSuchProcess(pid))
                } else {
                    Err(Error::Io {
                        path: proc_path,
                        source: e,
                    })
                }
            }
            Ok(_) => Ok(pid),
        }
    }
    fn check_required_tools(&self) -> Result<(), Error> {
        Ok(())
    }
}