# HG changeset patch
# User Augie Fackler <raf@durin42.com>
# Date 1512928257 18000
# Node ID c586d02f7cdad2615a094fffa160a305779cd32d
# Parent  7c37f08d303d7657269a39feeacc08607e2949eb
_readchannel: if a read failure is due to a broken server, report that

We can end up in this codepath if the specified hg binary fails to
start, and we're better off reporting that than the fact that we got
no response.

diff -r 7c37f08d303d -r c586d02f7cda hglib/client.py
--- a/hglib/client.py	Sun Dec 10 12:37:36 2017 -0500
+++ b/hglib/client.py	Sun Dec 10 12:50:57 2017 -0500
@@ -147,7 +147,10 @@
     def _readchannel(self):
         data = self.server.stdout.read(hgclient.outputfmtsize)
         if not data:
-            self.close()
+            ret, serr = self._close()
+            if ret != 0:
+                raise error.ServerError('server exited with status %d: %s'
+                                        % (ret, serr.strip()))
             raise error.ResponseError('no response received from server')
         channel, length = struct.unpack(hgclient.outputfmt, data)
         if channel in b('IL'):
@@ -271,6 +274,10 @@
             self.close()
             raise
         except error.ServerError:
+            if self.server is None:
+                # server is already closed, hopefully the ServerError
+                # we got has enough information.
+                raise
             ret, serr = self._close()
             raise error.ServerError('server exited with status %d: %s'
                                     % (ret, serr.strip()))