container_pid/
lib.rs

1use anyhow::bail;
2use libc::pid_t;
3use std::fmt::Debug;
4
5use crate::result::Result;
6
7mod cmd;
8mod command;
9mod containerd;
10mod docker;
11mod kubernetes;
12mod lxc;
13mod lxd;
14mod nspawn;
15mod podman;
16mod process_id;
17mod result;
18
19pub trait Container: Debug {
20    fn lookup(&self, id: &str) -> Result<pid_t>;
21    fn check_required_tools(&self) -> Result<()>;
22}
23
24pub const AVAILABLE_CONTAINER_TYPES: &[&str] = &[
25    "process_id",
26    "podman",
27    "docker",
28    "nspawn",
29    "lxc",
30    "lxd",
31    "command",
32    "containerd",
33    "kubernetes",
34];
35
36fn default_order() -> Vec<Box<dyn Container>> {
37    let containers: Vec<Box<dyn Container>> = vec![
38        Box::new(process_id::ProcessId {}),
39        Box::new(podman::Podman {}),
40        Box::new(docker::Docker {}),
41        Box::new(nspawn::Nspawn {}),
42        Box::new(lxc::Lxc {}),
43        Box::new(lxd::Lxd {}),
44        Box::new(containerd::Containerd {}),
45        Box::new(kubernetes::Kubernetes {}),
46    ];
47    containers
48        .into_iter()
49        .filter(|c| c.check_required_tools().is_ok())
50        .collect()
51}
52
53pub fn lookup_container_type(name: &str) -> Option<Box<dyn Container>> {
54    Some(match name {
55        "process_id" => Box::new(process_id::ProcessId {}),
56        "podman" => Box::new(podman::Podman {}),
57        "docker" => Box::new(docker::Docker {}),
58        "nspawn" => Box::new(nspawn::Nspawn {}),
59        "lxc" => Box::new(lxc::Lxc {}),
60        "lxd" => Box::new(lxd::Lxd {}),
61        "containerd" => Box::new(containerd::Containerd {}),
62        "command" => Box::new(command::Command {}),
63        "kubernetes" => Box::new(kubernetes::Kubernetes {}),
64        _ => return None,
65    })
66}
67
68pub fn lookup_container_pid(
69    container_id: &str,
70    container_types: &[Box<dyn Container>],
71) -> Result<pid_t> {
72    for c in container_types {
73        c.check_required_tools()?;
74    }
75    let fallback: Vec<Box<dyn Container>> = default_order();
76    let types = if container_types.is_empty() {
77        fallback.as_slice()
78    } else {
79        container_types
80    };
81
82    let mut message = String::from("failed to find container - tried the following runtimes:");
83    for t in types {
84        match t.lookup(container_id) {
85            Ok(pid) => return Ok(pid),
86            Err(e) => {
87                message += &format!("\n  - {:?}: {}", t, e);
88            }
89        };
90    }
91
92    bail!("{}", message)
93}
container_pid/lib.rs

container_pid/
lib.rs
