Add a --generate-only option

docker/configure_workers_and_start.py

@@ -53,6 +53,7 @@
 import re
 import subprocess
 import sys
+from argparse import ArgumentParser
 from collections import defaultdict
 from dataclasses import dataclass, field
 from itertools import chain
@@ -969,6 +970,14 @@ def generate_worker_log_config(
 
 
 def main(args: List[str], environ: MutableMapping[str, str]) -> None:
+ parser = ArgumentParser()
+ parser.add_argument(
+ "--generate-only",
+ action="store_true",
+ help="Only generate configuration; don't run Synapse.",
+ )
+ opts = parser.parse_args(args)
+
  config_dir = environ.get("SYNAPSE_CONFIG_DIR", "/data")
  config_path = environ.get("SYNAPSE_CONFIG_PATH", config_dir + "/homeserver.yaml")
  data_dir = environ.get("SYNAPSE_DATA_DIR", "/data")
@@ -1010,6 +1019,10 @@ def main(args: List[str], environ: MutableMapping[str, str]) -> None:
  else:
  log("Worker config exists—not regenerating")
 
+ if opts.generate_only:
+ log("--generate-only: won't run Synapse")
+ return
+
  # Lifted right out of start.py
  jemallocpath = "/usr/lib/%s-linux-gnu/libjemalloc.so.2" % (platform.machine(),)