diff -r 0fa30fbccc34 -r aff7b32b3c05 mercurial/hook.py
--- a/mercurial/hook.py	Fri Mar 31 11:08:11 2017 +0200
+++ b/mercurial/hook.py	Fri Mar 31 11:53:56 2017 +0200
@@ -127,6 +127,7 @@
         if tr and tr.writepending():
             env['HG_PENDING'] = repo.root
     env['HG_HOOKTYPE'] = htype
+    env['HG_HOOKNAME'] = name
 
     for k, v in args.iteritems():
         if callable(v):