# HG changeset patch
# User Yuya Nishihara <yuya@tcha.org>
# Date 1538901325 -32400
# Node ID d1338b4e39d0f916186c54231141d44545c5f8b0
# Parent  413b6b10fdd5273463015ee73496c5df6890b636
chgserver: catch Abort while parsing early args to shut down cleanly

_loadnewui() calls dispatcher functions, which may raise Abort if unparsable
arguments are passed in. The server should catch such errors and translate
them to the "exit 255" instruction so the client can finish the IPC session
cleanly.

Spotted while porting the chg client to Rust.

diff -r 413b6b10fdd5 -r d1338b4e39d0 mercurial/chgserver.py
--- a/mercurial/chgserver.py	Fri Oct 05 22:08:37 2018 +0900
+++ b/mercurial/chgserver.py	Sun Oct 07 17:35:25 2018 +0900
@@ -425,6 +425,13 @@
             self.ui.flush()
             self.cresult.write('exit 255')
             return
+        except error.Abort as inst:
+            self.ui.error(_("abort: %s\n") % inst)
+            if inst.hint:
+                self.ui.error(_("(%s)\n") % inst.hint)
+            self.ui.flush()
+            self.cresult.write('exit 255')
+            return
         newhash = hashstate.fromui(lui, self.hashstate.mtimepaths)
         insts = []
         if newhash.mtimehash != self.hashstate.mtimehash: