cmdserver: add option to not exit from message loop on SIGINT Sending SIGINT to server is the only way to interrupt a command running in command-server process. SIGINT will be caught at dispatch.dispatch() if we're lucky. Otherwise it will terminate the serer process. This is fundamentally unreliable as signals are delivered asynchronously. "cmdserver.shutdown-on-interrupt=False" mitigate the issue by making the server basically block SIGINT.

--- a/mercurial/configitems.py	Mon Jul 06 17:51:18 2020 +0200
+++ b/mercurial/configitems.py	Sat Jun 27 21:46:23 2020 +0900
@@ -212,6 +212,9 @@
     default=lambda: [b'chgserver', b'cmdserver', b'repocache'],
 )
 coreconfigitem(
+    b'cmdserver', b'shutdown-on-interrupt', default=True,
+)
+coreconfigitem(
     b'color', b'.*', default=None, generic=True,
 )
 coreconfigitem(