# HG changeset patch
# User Gábor Stefanik <gabor.stefanik@nng.com>
# Date 1503328417 -7200
# Node ID 6987d6cd420c35a9dde0642cb6cd4008e59afa70
# Parent  f38bc05696713624628641e6a042d2219830ef09
client: raise ResponseError in _readchannel()

Make it clearer that this is an unrecoverable communication error.
ServerError alone is not always unrecoverable, as CapabilityError is considered
a subtype of it.

This way, a caller can check for ResponseError to identify errors that require
reopening the client to recover.

diff -r f38bc0569671 -r 6987d6cd420c hglib/client.py
--- a/hglib/client.py	Mon Aug 21 17:06:13 2017 +0200
+++ b/hglib/client.py	Mon Aug 21 17:13:37 2017 +0200
@@ -140,7 +140,7 @@
         data = self.server.stdout.read(hgclient.outputfmtsize)
         if not data:
             self.close()
-            raise error.ServerError()
+            raise error.ResponseError('no response received from server')
         channel, length = struct.unpack(hgclient.outputfmt, data)
         if channel in b('IL'):
             return channel, length