Add --force-zero support for sync

snapraid-runner.conf.example

@@ -51,3 +51,7 @@ enabled = false
 plan = 12
 ; minimum block age (in days) for scrubbing. Only used with percentage plans
 older-than = 10
+
+[sync]
+; set to true to force sync files with zero size
+force-zero = false

snapraid-runner.py

@@ -42,7 +42,9 @@ def snapraid_command(command, args={}, *, allow_statuscodes=[]):
     arguments = ["--conf", config["snapraid"]["config"],
                  "--quiet"]
     for (k, v) in args.items():
-        arguments.extend(["--" + k, str(v)])
+        arguments.append("--" + k)
+        if v != '':
+            arguments.append(str(v))
     p = subprocess.Popen(
         [config["snapraid"]["executable"], command] + arguments,
         stdout=subprocess.PIPE,
@@ -154,7 +156,7 @@ def load_config(args):
     global config
     parser = configparser.RawConfigParser()
     parser.read(args.conf)
-    sections = ["snapraid", "logging", "email", "gotify", "smtp", "scrub"]
+    sections = ["snapraid", "logging", "email", "gotify", "smtp", "scrub", "sync"]
     config = dict((x, defaultdict(lambda: "")) for x in sections)
     for section in parser.sections():
         for (k, v) in parser.items(section):
@@ -175,6 +177,7 @@ def load_config(args):
     config["scrub"]["enabled"] = (config["scrub"]["enabled"].lower() == "true")
     config["email"]["short"] = (config["email"]["short"].lower() == "true")
     config["snapraid"]["touch"] = (config["snapraid"]["touch"].lower() == "true")
+    config["sync"]["force-zero"] = (config["sync"]["force-zero"].lower() == "true")
 
     # Migration
     if config["scrub"]["percentage"]:
@@ -302,8 +305,11 @@ def run():
         logging.info("No changes detected, no sync required")
     else:
         logging.info("Running sync...")
+        sync_args: dict[str, str] = {}
+        if config["sync"]["force-zero"]:
+            sync_args["force-zero"] = ""
         try:
-            snapraid_command("sync")
+            snapraid_command("sync", sync_args)
         except subprocess.CalledProcessError as e:
             logging.error(e)
             finish(False)