diff --git a/changelog.d/16828.misc b/changelog.d/16828.misc
new file mode 100644
index 0000000000..6425062bb1
--- /dev/null
+++ b/changelog.d/16828.misc
@@ -0,0 +1 @@
+Add a `--generate-only` option to the Complement launcher.
\ No newline at end of file
diff --git a/docker/configure_workers_and_start.py b/docker/configure_workers_and_start.py
index dff8f1733a..fdaa16cc23 100755
--- a/docker/configure_workers_and_start.py
+++ b/docker/configure_workers_and_start.py
@@ -58,6 +58,7 @@ import platform
import re
import subprocess
import sys
+from argparse import ArgumentParser
from collections import defaultdict
from itertools import chain
from pathlib import Path
@@ -1024,6 +1025,14 @@ 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")
@@ -1065,6 +1074,10 @@ 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(),)
@@ -1087,4 +1100,4 @@ def main(args: List[str], environ: MutableMapping[str, str]) -> None:
if __name__ == "__main__":
- main(sys.argv, os.environ)
+ main(sys.argv[1:], os.environ)
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