narrow: pass 'narrow_widen' as source while generating changegroup

narrow: pass 'narrow_widen' as source while generating changegroup

Extensions inspect the `source` parameter and add some custom logic on the basis
of value of that parameter. The parameter is also passed to hooks. So let's pass
the value as 'narrow_widen' to differentiate widening from pull.

Differential Revision: https://phab.mercurial-scm.org/D4787

--- a/hgext/narrow/narrowbundle2.py	Fri Sep 28 19:18:17 2018 +0300
+++ b/hgext/narrow/narrowbundle2.py	Fri Sep 28 19:21:24 2018 +0300
@@ -51,7 +51,7 @@
     caps[NARROWCAP] = ['v0']
     return caps
 
-def widen_bundle(repo, diffmatcher, common, known, cgversion, source, ellipses):
+def widen_bundle(repo, diffmatcher, common, known, cgversion, ellipses):
     """generates changegroup for widening a narrow clone
 
     repo is the localrepository instance
@@ -60,7 +60,6 @@
     common is set of common revs between server and client
     known is a set of revs known on the client side (used in ellipses)
     cgversion is the changegroup version to send
-    source is the command which called this codepath
     ellipses is boolean value telling whether to send ellipses data or not
 
     returns changegroup data of the changegroup built or return None if there
@@ -80,7 +79,7 @@
                                         filematcher=diffmatcher,
                                         fullnodes=commonnodes)
         cgdata = packer.generate(set([nullid]), list(commonnodes), False,
-                                 source, changelog=False)
+                                 'narrow_widen', changelog=False)
 
         return cgdata
 
@@ -114,8 +113,7 @@
     common = set(common or [nullid])
 
     if (oldinclude != include or oldexclude != exclude):
-        cgdata = widen_bundle(repo, diffmatch, common, [], version,
-                              source, False)
+        cgdata = widen_bundle(repo, diffmatch, common, [], version, False)
         if cgdata is not None:
             part = bundler.newpart('changegroup', data=cgdata)
             part.addparam('version', version)
@@ -194,7 +192,7 @@
                                             shallow=depth is not None,
                                             ellipsisroots=newellipsis,
                                             fullnodes=newfull)
-            cgdata = packer.generate(common, newvisit, False, source)
+            cgdata = packer.generate(common, newvisit, False, 'narrow_widen')
 
             part = bundler.newpart('changegroup', data=cgdata)
             part.addparam('version', version)
@@ -212,7 +210,7 @@
                                         shallow=depth is not None,
                                         ellipsisroots=ellipsisroots,
                                         fullnodes=relevant_nodes)
-        cgdata = packer.generate(common, visitnodes, False, source)
+        cgdata = packer.generate(common, visitnodes, False, 'narrow_widen')
 
         part = bundler.newpart('changegroup', data=cgdata)
         part.addparam('version', version)