settings: reload through SIGHUP

settings/settings.go

@@ -6,8 +6,10 @@ import (
 	"encoding/json"
 	"log"
 	"os"
+	"os/signal"
 	"path"
 	"time"
+	"syscall"
 
 	"gopkg.in/fsnotify.v1"
 )
@@ -117,6 +119,20 @@ func LoadAndWatchSettings(settingsPath string, reload func (FICSettings)) {
 		}
 	}
 
+	// Register SIGHUP
+	c := make(chan os.Signal, 1)
+	signal.Notify(c, syscall.SIGHUP)
+	go func(){
+		for range c {
+			log.Println("SIGHUP received, reloading settings...")
+			if config, err := ReadSettings(settingsPath); err != nil {
+				log.Println("ERROR: Unable to read challenge settings:", err)
+			} else {
+				reload(config)
+			}
+		}
+	}()
+
 	// Watch the configuration file
 	if watcher, err := fsnotify.NewWatcher(); err != nil {
 		log.Fatal(err)