mirror of
https://github.com/containers/youki
synced 2024-05-21 15:06:07 +02:00
120 lines
3.3 KiB
Rust
120 lines
3.3 KiB
Rust
use std::path::Path;
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use anyhow::Result;
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use super::Controller;
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use crate::{
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common,
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stats::{self, PidStats, StatsProvider},
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};
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use oci_spec::{LinuxPids, LinuxResources};
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// Contains the maximum allowed number of active pids
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const CGROUP_PIDS_MAX: &str = "pids.max";
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pub struct Pids {}
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impl Controller for Pids {
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type Resource = LinuxPids;
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fn apply(linux_resources: &LinuxResources, cgroup_root: &Path) -> Result<()> {
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log::debug!("Apply pids cgroup config");
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if let Some(pids) = &linux_resources.pids {
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Self::apply(cgroup_root, pids)?;
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}
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Ok(())
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}
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fn needs_to_handle(linux_resources: &LinuxResources) -> Option<&Self::Resource> {
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if let Some(pids) = &linux_resources.pids {
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return Some(pids);
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}
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None
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}
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}
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impl StatsProvider for Pids {
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type Stats = PidStats;
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fn stats(cgroup_path: &Path) -> Result<Self::Stats> {
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stats::pid_stats(cgroup_path)
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}
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}
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impl Pids {
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fn apply(root_path: &Path, pids: &LinuxPids) -> Result<()> {
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let limit = if pids.limit > 0 {
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pids.limit.to_string()
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} else {
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"max".to_string()
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};
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common::write_cgroup_file_str(&root_path.join(CGROUP_PIDS_MAX), &limit)?;
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Ok(())
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use crate::test::{create_temp_dir, set_fixture};
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use oci_spec::LinuxPids;
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// Contains the current number of active pids
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const CGROUP_PIDS_CURRENT: &str = "pids.current";
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#[test]
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fn test_set_pids() {
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let tmp = create_temp_dir("test_set_pids").expect("create temp directory for test");
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set_fixture(&tmp, CGROUP_PIDS_MAX, "1000").expect("Set fixture for 1000 pids");
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let pids = LinuxPids { limit: 1000 };
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Pids::apply(&tmp, &pids).expect("apply pids");
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let content =
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std::fs::read_to_string(tmp.join(CGROUP_PIDS_MAX)).expect("Read pids contents");
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assert_eq!(pids.limit.to_string(), content);
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}
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#[test]
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fn test_set_pids_max() {
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let tmp = create_temp_dir("test_set_pids_max").expect("create temp directory for test");
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set_fixture(&tmp, CGROUP_PIDS_MAX, "0").expect("set fixture for 0 pids");
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let pids = LinuxPids { limit: 0 };
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Pids::apply(&tmp, &pids).expect("apply pids");
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let content =
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std::fs::read_to_string(tmp.join(CGROUP_PIDS_MAX)).expect("Read pids contents");
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assert_eq!("max".to_string(), content);
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}
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#[test]
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fn test_stat_pids() {
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let tmp = create_temp_dir("test_stat_pids").expect("create temp dir for test");
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set_fixture(&tmp, CGROUP_PIDS_CURRENT, "5\n").unwrap();
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set_fixture(&tmp, CGROUP_PIDS_MAX, "30\n").unwrap();
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let stats = Pids::stats(&tmp).expect("get cgroup stats");
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assert_eq!(stats.current, 5);
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assert_eq!(stats.limit, 30);
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}
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#[test]
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fn test_stat_pids_max() {
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let tmp = create_temp_dir("test_stat_pids_max").expect("create temp dir for test");
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set_fixture(&tmp, CGROUP_PIDS_CURRENT, "5\n").unwrap();
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set_fixture(&tmp, CGROUP_PIDS_MAX, "max\n").unwrap();
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let stats = Pids::stats(&tmp).expect("get cgroup stats");
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assert_eq!(stats.current, 5);
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assert_eq!(stats.limit, 0);
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}
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}
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