Catch HTTPException when reading from remote http repository.

If the server dies very early, an httplib.IncompleteRead exception may be
raised, because httplib can't read a single byte. Catching all HTTPException
subclasses here will prevent ugly backtraces for similar things, too.

mercurial/httprepo.py

@@ -9,7 +9,7 b' from node import *'
 from remoterepo import *
 from i18n import gettext as _
 from demandload import *
-demandload(globals(), "hg os urllib urllib2 urlparse zlib util")
+demandload(globals(), "hg os urllib urllib2 urlparse zlib util httplib")
 
 class httprepository(remoterepository):
     def __init__(self, ui, path):
@@ -129,8 +129,11 b' class httprepository(remoterepository):'
 
         def zgenerator(f):
             zd = zlib.decompressobj()
+            try:
             for chnk in f:
                 yield zd.decompress(chnk)
+            except httplib.HTTPException, inst:
+                raise IOError(None, _('connection ended unexpectedly'))
             yield zd.flush()
 
         return util.chunkbuffer(zgenerator(util.filechunkiter(f)))