53 lines
1.9 KiB
Rust
53 lines
1.9 KiB
Rust
use crate::DResult;
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use log::info;
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use nix::{
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sys::signal::{kill, Signal},
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unistd::{getpid, Pid},
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};
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use std::error::Error;
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use std::fs::{read_to_string, write};
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use std::path::Path;
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pub fn replace_old_gameserver(pidfile: &str) -> DResult<()> {
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match read_to_string(pidfile) {
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Err(e) => {
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if e.kind() == std::io::ErrorKind::NotFound {
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info!("pidfile not found, assuming not already running");
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Ok(())
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} else {
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info!("Error reading pidfile (other than NotFound): {}", e);
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Err(Box::new(e) as Box<dyn Error + Send + Sync>)
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}
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}
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Ok(f) => {
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let pid: Pid = Pid::from_raw(
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f.parse()
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.map_err(|e| Box::new(e) as Box<dyn Error + Send + Sync>)?,
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);
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if pid == getpid() {
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info!("Pid in pidfile is me - ignoring");
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return Ok(());
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}
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match read_to_string(format!("/proc/{}/cmdline", pid)) {
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Ok(content) => {
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if content.contains("blastmud_game") {
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info!("pid in pidfile references blastmud_game; starting cutover");
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kill(pid, Signal::SIGUSR1)
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.map_err(|e| Box::new(e) as Box<dyn Error + Send + Sync>)
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} else {
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info!("Pid in pidfile is for process not including blastmud_game - ignoring pidfile");
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Ok(())
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}
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}
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Err(_) => {
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info!("Pid in pidfile is gone - ignoring pidfile");
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Ok(())
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}
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}
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}
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}?;
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info!("Writing new pidfile");
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write(Path::new(pidfile), format!("{}", std::process::id()))
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.map_err(|e| Box::new(e) as Box<dyn Error + Send + Sync>)
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}
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