Remove the PID file after exit

Fix #25

acme_common/src/lib.rs

@@ -1,7 +1,7 @@
 use daemonize::Daemonize;
 use std::fs::File;
 use std::io::prelude::*;
-use std::process;
+use std::{fs, process};
 
 pub mod crypto;
 pub mod error;
@@ -57,6 +57,13 @@ fn write_pid_file(pid_file: &str) -> Result<(), error::Error> {
     Ok(())
 }
 
+pub fn clean_pid_file(pid_file: Option<&str>) -> Result<(), error::Error> {
+    if let Some(f) = pid_file {
+        fs::remove_file(f)?;
+    }
+    Ok(())
+}
+
 #[cfg(test)]
 mod tests {
     use super::to_idna;

acmed/src/main.rs

@@ -1,5 +1,5 @@
 use crate::main_event_loop::MainEventLoop;
-use acme_common::init_server;
+use acme_common::{clean_pid_file, init_server};
 use clap::{App, Arg};
 use log::error;
 
@@ -126,6 +126,7 @@ fn main() {
         Ok(s) => s,
         Err(e) => {
             error!("{}", e);
+            let _ = clean_pid_file(matches.value_of("pid-file"));
             std::process::exit(1);
         }
     };

tacd/src/main.rs

@@ -3,7 +3,7 @@ mod openssl_server;
 use crate::openssl_server::start as server_start;
 use acme_common::crypto::X509Certificate;
 use acme_common::error::Error;
-use acme_common::to_idna;
+use acme_common::{clean_pid_file, to_idna};
 use clap::{App, Arg, ArgMatches};
 use log::{debug, error, info};
 use std::fs::File;
@@ -151,6 +151,7 @@ fn main() {
         Ok(_) => {}
         Err(e) => {
             error!("{}", e);
+            let _ = clean_pid_file(matches.value_of("pid-file"));
             std::process::exit(1);
         }
     };