bundle2: store the salvaged output on the exception object

The re-handling of output is happening in some 'unbundle' callers. We have to
transmit the output information to this place so we stick it on the exception.

This is the third step in our quest for preserving the server output on error
(issue4594). We want to be able to copy the output part from the aborted reply
into the exception bundle.

mercurial/bundle2.py

@@ -318,6 +318,10 b' def processbundle(repo, unbundler, trans'
         # type of bundle. We should probably clean up or drop this return code
         # craziness in a future version.
         exc.duringunbundle2 = True
+        salvaged = []
+        if op.reply is not None:
+            salvaged = op.reply.salvageoutput()
+        exc._bundle2salvagedoutput = salvaged
         raise
     return op
 

mercurial/exchange.py

@@ -1288,6 +1288,7 b' def unbundle(repo, cg, heads, source, ur'
         check_heads(repo, heads, 'uploading changes')
         # push can proceed
         if util.safehasattr(cg, 'params'):
+            r = None
             try:
                 wlock = repo.wlock()
                 lock = repo.lock()
@@ -1299,6 +1300,8 b' def unbundle(repo, cg, heads, source, ur'
                 tr.close()
             except Exception, exc:
                 exc.duringunbundle2 = True
+                if r is not None:
+                    exc._bundle2salvagedoutput = r.salvageoutput()
                 raise
         else:
             lock = repo.lock()