systemctl's Introduction

systemctl

Small rust crate to interact with systemd units

Environment

SYSTEMCTL_PATH custom env. variable describes the absolute location path of systemctl binary, by default this crate uses /usr/bin/systemctl, but that can be customized:

SYSTEMCTL_PATH=/home/$me/bin/systemctl cargo build

Unit / service operation

Nominal service operations:

systemctl::stop("systemd-journald.service")
    .unwrap();
systemctl::restart("systemd-journald.service")
    .unwrap();

if let Ok(true) = systemctl::exists("ntpd") {
    let is_active = systemctl::is_active("ntpd")
        .unwrap();
}

Service enumeration

use systemctl;
// list all units
systemctl::list_units(None, None, None);

// list all services 
// by adding a --type filter
systemctl::list_units(Some("service"), None, None);

// list all services currently `enabled` 
// by adding a --state filter
systemctl::list_units(Some("service"), Some("enabled"), None);

// list all services starting with cron
systemctl::list_units(Some("service"), None, Some("cron*"));

Unit structure

Use the unit structure for more information

let unit = systemctl::Unit::from_systemctl("sshd")
    .unwrap();
unit.restart().unwrap();
println!("active: {}", unit.active);
println!("preset: {}", unit.preset);

if let Some(docs) = unit.docs { // doc pages available
    for doc in docs {
        if let Some(page) = doc.as_man() {
            // `man` page exists 
        }
        if let Some(url) = doc.as_url() {
            // `url` is indicated
        }
    }
}

println!("auto_start (enabled): {}", unit.auto_start);
println!("config script : {}", unit.script);
println!("pid: {}", unit.pid);
println!("Running task(s): {}", unit.tasks.unwrap());
println!("Memory consumption: {}", unit.memory.unwrap());