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|
// This module defines unit settings parsing logig
//
// NOTE: ON UNIT PARSING LOGIC
// when parsing a unit in /etc/vigil/units/ we shoul ignore
// ANY broken/bad constructed toml unit configuration file
// without "crashing" logic.
//
// NOTE: ON GENERAL SERVICE LOGGING
// when vigil starts service, it should send out logs to vigil?
// or logs in such init systems are just taking the stdout+stderr
// of service and showing its output? idk 4 now, look into how its supposed to be
use crate::{log_warning, RUNLEVEL_STATE};
use serde::Deserialize;
use std::fs::{read_dir, read_to_string};
/*
[info]
name = "name"
description = "description"
version = "version"
[config]
exec = "path to exec"
runlevel =
restart=always|never
*/
#[derive(Deserialize)]
enum Restart {
#[serde(alias = "always")]
Always,
#[serde(alias = "never")]
Never,
}
#[derive(Deserialize, PartialEq, Eq)]
pub enum Runlevel {
/// The system is shutting down, runlevel int: 0
Shutdown,
/// One-user system debug-mode, runlevel int: 1
OneUser,
/// Multi-user CLI (TTY) with no network, runlevel int: 2
MultiNoNetwork,
/// Multi-user CLI with network, runlevel int: 3
MultiNetwork,
/// Multi-user mode with GUI, runlevel int: 5
MultiUserGUINetwork,
/// Runlevel is not critical for running the service, runlevel int: 4
Undefined,
/// System going too reboot, runlevel int: 6
Reboot,
}
#[allow(dead_code)]
#[derive(Deserialize)]
pub struct ServiceInfo {
/// Service name
name: String,
/// Service description
description: String,
/// Service version
version: String,
}
#[allow(dead_code)]
#[derive(Deserialize)]
pub struct ServiceConfig {
/// Execution command, like ExecStart in sysd
exec: String,
/// Runlevel, like after=*.target
runlevel: Runlevel,
/// Restart service: Always|Never
restart: Restart,
}
/// Main Unit-file struct
#[allow(dead_code)]
#[derive(Deserialize)]
pub struct Unit {
info: ServiceInfo,
config: ServiceConfig,
}
#[allow(dead_code)]
impl Restart {
pub fn as_str(&self) -> &'static str {
match self {
Restart::Always => "always",
Restart::Never => "never",
}
}
}
/// Function which starting services declared in `/etc/vigil/units/`
/// Based on the global runlevel variable, should be runned as second thread
pub fn execute_services() -> Result<(), Box<dyn std::error::Error>> {
let unit_list = parse_all_units()?;
loop {
match *RUNLEVEL_STATE.try_lock()? {
Runlevel::Undefined => {
for unit in &unit_list {
if unit.config.runlevel == Runlevel::Undefined {
std::process::Command::new(unit.config.exec.clone());
} else {
continue;
}
}
}
Runlevel::Reboot => {
todo!();
}
Runlevel::Shutdown => {
todo!();
}
Runlevel::OneUser => {
todo!();
}
Runlevel::MultiNoNetwork => {
todo!();
}
Runlevel::MultiNetwork => {
todo!();
}
Runlevel::MultiUserGUINetwork => {
todo!();
}
}
}
}
#[allow(dead_code)]
fn parse_all_units() -> Result<Vec<Unit>, Box<dyn std::error::Error>> {
let mut units: Vec<Unit> = Vec::new();
for unit in read_dir("/etc/vigil/units")? {
let unit_path = unit?.path();
let unit_str: String = match read_to_string(unit_path) {
Ok(content) => content,
Err(e) => {
log_warning(&format!("Error while reading unit: {}", e));
continue;
}
};
let deserialized: Result<Unit, _> = toml::from_str(&unit_str);
match deserialized {
Ok(unit) => {
units.push(unit);
}
Err(e) => {
log_warning(&format!("Error while parsing unit: {}", e));
continue;
}
};
}
Ok(units)
}
|
