[fix] proxy and certbot now exit properly with code 0

- also fixed (currently not used) saving log to file

proxy/files/entrypoint.sh

@@ -11,6 +11,7 @@ log_file="" # leave empty for stdout
 # variables
 domain_file="$temp_path/domains.txt"
 certs_updated="$cert_root_path/.updated"
+certs_daemon_pid=-1
 
 #functions
 function log()
@@ -35,11 +36,36 @@ function log()
             echo "[$time]:[$prefix]:[$0][$func]: $@" 2>&1
             ;;
         *)
-            echo "[$time]:[$prefix]:[$0][$func]: $@" >> log_path
+            echo "[$time]:[$prefix]:[$0][$func]: $@" >> $log_file
             ;;
     esac
 }
 
+function sleep_wait()
+{
+    # waiting on sleep to be able to handle SIGTERM
+    sleep $1 &
+    wait $!
+}
+
+function exit_handler()
+{
+    # TODO: because nginx is started in foreground and replaces
+    # the shell via exec, this handler is never called, however as there 
+    # is no cleanup for the certs_daemon it doesn't really matter
+    if [ $certs_daemon_pid -gt 0 ] ; then
+        log exit_handler "stopping certs_daemon"
+        kill -SIGTERM $certs_daemon_pid
+    fi
+    log exit_handler "shutting down nginx"
+    nginx -s quit
+    log exit_handler "container shutting down"
+    exit
+}
+
+trap "exit_handler" SIGINT
+trap "exit_handler" SIGTERM
+
 function var_to_file()
 {
     local var=$1
@@ -89,13 +115,13 @@ function certs_daemon()
         # wait for nginx to start
         while [ ! -f "$nginx_pid" ]; do
             log certs_daemon "Waiting for nginx to start"
-            sleep 1
+            sleep_wait 1
         done
         
         # wait for inital cert update
         while [ ! -f "$certs_updated" ]; do
             log certs_daemon "Waiting for initial cert update"
-            sleep 1
+            sleep_wait 1
         done
         
         # reload nginx
@@ -107,6 +133,7 @@ function certs_daemon()
             nginx -s reload
         done
     ) &
+    certs_daemon_pid=$!
 }
 
 function nginx_handler()
@@ -121,13 +148,12 @@ function nginx_handler()
     while ! read_file cert_exists "$domain_file" && [ "$retries" -lt "$server_retries" ]; do
         log nginx_handler "Waiting for certs to be created"
         retries=$(( retries+1 ))
-        sleep 1
+        sleep_wait 1
     done
 
     # starting nginx in foreground
     log nginx_handler "Starting nginx in foreground"
-    nginx -g "daemon off;"
-
+    exec nginx -g "daemon off;"
 }
 
 function main()