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pub struct StartupAck {
writer: std::os::unix::io::RawFd,
}
impl StartupAck {
pub fn ack(&self) -> anyhow::Result<()> {
nix::unistd::write(self.writer, &[0])?;
nix::unistd::close(self.writer)?;
Ok(())
}
}
impl Drop for StartupAck {
fn drop(&mut self) {
// best effort close here, can't do better in a destructor
let _ = nix::unistd::close(self.writer);
}
}
pub fn daemonize() -> anyhow::Result<StartupAck> {
rbw::dirs::make_all()?;
let stdout = std::fs::OpenOptions::new()
.append(true)
.create(true)
.open(rbw::dirs::agent_stdout_file())?;
let stderr = std::fs::OpenOptions::new()
.append(true)
.create(true)
.open(rbw::dirs::agent_stderr_file())?;
let (r, w) = nix::unistd::pipe()?;
let daemonize = daemonize::Daemonize::new()
.pid_file(rbw::dirs::pid_file())
.stdout(stdout)
.stderr(stderr);
let res = match daemonize.execute() {
daemonize::Outcome::Parent(_) => {
// unwraps are necessary because not really a good way to handle
// errors here otherwise
let _ = nix::unistd::close(w);
let mut buf = [0; 1];
nix::unistd::read(r, &mut buf).unwrap();
nix::unistd::close(r).unwrap();
std::process::exit(0);
}
daemonize::Outcome::Child(res) => res,
};
let _ = nix::unistd::close(r);
match res {
Ok(_) => (),
Err(e) => {
// XXX super gross, but daemonize removed the ability to match
// on specific error types for some reason?
if e.to_string().contains("unable to lock pid file") {
// this means that there is already an agent running, so
// return a special exit code to allow the cli to detect
// this case and not error out
std::process::exit(23);
} else {
panic!("failed to daemonize: {e}");
}
}
}
Ok(StartupAck { writer: w })
}
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