zulip_tools: Extract out `list_supervisor_processes`.

scripts/lib/zulip_tools.py

@@ -628,6 +628,21 @@ def has_application_server(once: bool = False) -> bool:
     )
 
 
+def list_supervisor_processes(*args: str) -> List[str]:
+    worker_status = subprocess.run(
+        ["supervisorctl", "status", *args],
+        universal_newlines=True,
+        stdout=subprocess.PIPE,
+    )
+    # `supercisorctl status` returns 3 if any are stopped, which is fine here.
+    if worker_status.returncode not in (0, 3):
+        worker_status.check_returncode()
+
+    processes = []
+    for status_line in worker_status.stdout.splitlines():
+        processes.append(status_line.split()[0])
+    return processes
+
 def has_process_fts_updates() -> bool:
     return (
         # Current path

scripts/restart-server

@@ -18,6 +18,7 @@ from scripts.lib.zulip_tools import (
     get_tornado_ports,
     has_application_server,
     has_process_fts_updates,
+    list_supervisor_processes,
     overwrite_symlink,
 )
 
@@ -76,15 +77,7 @@ if has_application_server():
     if action == "start" or args.less_graceful:
         workers.append("zulip-workers:*")
     else:
-        worker_status = subprocess.run(
-            ["supervisorctl", "status", "zulip-workers:*"],
-            universal_newlines=True,
-            stdout=subprocess.PIPE,
-        )
-        # `supercisorctl status` returns 3 if any are stopped, which is fine here.
-        if worker_status.returncode not in (0, 3):
-            worker_status.check_returncode()
-        workers.extend(status_line.split()[0] for status_line in worker_status.stdout.splitlines())
+        workers.extend(list_supervisor_processes("zulip-workers:*"))
 
     if has_application_server(once=True):
         workers.extend(