Support identical cron schedule (#87)

* Retry on lock being unavailable

* Refactor locking to return plain error

* Collect LockedTime in stats

* Add test case

* Add documentation for LOCK_TIMEOUT

* Log in case lock needs to be awaited

* Release resources created for awaiting lock

test/confd/02backup.env

@@ -0,0 +1,2 @@
+BACKUP_FILENAME="other.tar.gz"
+BACKUP_CRON_EXPRESSION="*/1 * * * *"

test/confd/docker-compose.yml

@@ -7,8 +7,9 @@ services:
     volumes:
       - ./local:/archive
       - app_data:/backup/app_data:ro
-      - ./backup.env:/etc/dockervolumebackup/conf.d/00backup.env
-      - ./never.env:/etc/dockervolumebackup/conf.d/10never.env
+      - ./01backup.env:/etc/dockervolumebackup/conf.d/01backup.env
+      - ./02backup.env:/etc/dockervolumebackup/conf.d/02backup.env
+      - ./03never.env:/etc/dockervolumebackup/conf.d/03never.env
       - /var/run/docker.sock:/var/run/docker.sock
 
   offen:

test/confd/run.sh

@@ -19,6 +19,12 @@ if [ ! -f ./local/conf.tar.gz ]; then
 fi
 echo "[TEST:PASS] Config from file was used."
 
+if [ ! -f ./local/other.tar.gz ]; then
+  echo "[TEST:FAIL] Run on same schedule did not succeed."
+  exit 1
+fi
+echo "[TEST:PASS] Run on same schedule succeeded."
+
 if [ -f ./local/never.tar.gz ]; then
   echo "[TEST:FAIL] Unexpected file was found."
   exit 1