exchange: use command executor for getbundle

exchange: use command executor for getbundle

The code consuming the bundle has been moved to inside the
context manager, as that is supposed to be part of the API.
(Although it doesn't matter for version 1 peers.)

Differential Revision: https://phab.mercurial-scm.org/D3316

--- a/mercurial/exchange.py	Fri Apr 13 11:45:38 2018 -0700
+++ b/mercurial/exchange.py	Fri Apr 13 11:37:37 2018 -0700
@@ -1648,17 +1648,22 @@
             kwargs['obsmarkers'] = True
             pullop.stepsdone.add('obsmarkers')
     _pullbundle2extraprepare(pullop, kwargs)
-    bundle = pullop.remote.getbundle('pull', **pycompat.strkwargs(kwargs))
-    try:
-        op = bundle2.bundleoperation(pullop.repo, pullop.gettransaction,
-                                     source='pull')
-        op.modes['bookmarks'] = 'records'
-        bundle2.processbundle(pullop.repo, bundle, op=op)
-    except bundle2.AbortFromPart as exc:
-        pullop.repo.ui.status(_('remote: abort: %s\n') % exc)
-        raise error.Abort(_('pull failed on remote'), hint=exc.hint)
-    except error.BundleValueError as exc:
-        raise error.Abort(_('missing support for %s') % exc)
+
+    with pullop.remote.commandexecutor() as e:
+        args = dict(kwargs)
+        args['source'] = 'pull'
+        bundle = e.callcommand('getbundle', args).result()
+
+        try:
+            op = bundle2.bundleoperation(pullop.repo, pullop.gettransaction,
+                                         source='pull')
+            op.modes['bookmarks'] = 'records'
+            bundle2.processbundle(pullop.repo, bundle, op=op)
+        except bundle2.AbortFromPart as exc:
+            pullop.repo.ui.status(_('remote: abort: %s\n') % exc)
+            raise error.Abort(_('pull failed on remote'), hint=exc.hint)
+        except error.BundleValueError as exc:
+            raise error.Abort(_('missing support for %s') % exc)
 
     if pullop.fetch:
         pullop.cgresult = bundle2.combinechangegroupresults(op)