Make data dir lock opt-in (#856)

src/daemon/config.rs

@@ -372,6 +372,9 @@ pub struct Config {
     #[serde(default = "ConfigDefaults::data_dir")]
     pub data_dir: PathBuf,
 
+    #[serde(default)] // default is false
+    pub data_dir_use_lock: bool,
+
     #[serde(default = "ConfigDefaults::always_recover_data")]
     pub always_recover_data: bool,
 
@@ -783,6 +786,7 @@ impl Config {
 
         let https_mode = HttpsMode::Generate;
         let data_dir = data_dir.to_path_buf();
+        let data_dir_use_lock = true; // ensure we touch this in tests
         let always_recover_data = false;
 
         let log_level = LevelFilter::Debug;
@@ -903,6 +907,7 @@ impl Config {
             port,
             https_mode,
             data_dir,
+            data_dir_use_lock,
             always_recover_data,
             pid_file,
             service_uri: None,

src/daemon/http/server.rs

@@ -113,7 +113,11 @@ fn test_data_dirs_or_die(config: &Config) {
 }
 
 pub async fn start_krill_daemon(config: Arc<Config>) -> Result<(), Error> {
-    let lock = KrillLock::create(&config);
+    let optional_lock = if config.data_dir_use_lock {
+        Some(KrillLock::create(&config))
+    } else {
+        None
+    };
 
     write_pid_file_or_die(&config);
     test_data_dirs_or_die(&config);
@@ -187,14 +191,18 @@ pub async fn start_krill_daemon(config: Arc<Config>) -> Result<(), Error> {
 
     let scheduler_task = scheduler.run();
 
-    try_join!(
-        server,
-        scheduler_task,
-        lock.handle_ctrl_c(),
-        #[cfg(unix)]
-        lock.handle_sig_term()
-    )
-    .map(|_| ())
+    if let Some(lock) = optional_lock {
+        try_join!(
+            server,
+            scheduler_task,
+            lock.handle_ctrl_c(),
+            #[cfg(unix)]
+            lock.handle_sig_term()
+        )
+        .map(|_| ())
+    } else {
+        try_join!(server, scheduler_task,).map(|_| ())
+    }
 }
 
 struct RequestLogger {