diff --git a/mercurial/util.py b/mercurial/util.py
--- a/mercurial/util.py
+++ b/mercurial/util.py
@@ -1660,13 +1660,7 @@
     b.reverse()
     return pycompat.ossep.join((['..'] * len(a)) + b) or '.'
 
-# the location of data files matching the source code
-if procutil.mainfrozen() and getattr(sys, 'frozen', None) != 'macosx_app':
-    # executable version (py2exe) doesn't support __file__
-    datapath = os.path.dirname(pycompat.sysexecutable)
-else:
-    datapath = os.path.dirname(pycompat.fsencode(__file__))
-
+datapath = procutil.datapath()
 i18n.setdatapath(datapath)
 
 def checksignature(func):
diff --git a/mercurial/utils/procutil.py b/mercurial/utils/procutil.py
--- a/mercurial/utils/procutil.py
+++ b/mercurial/utils/procutil.py
@@ -535,3 +535,12 @@
             # mission accomplished, this child needs to exit and not
             # continue the hg process here.
             os._exit(returncode)
+
+def datapath():
+    """Return location of data/resource files that are part of the source."""
+    if mainfrozen() and getattr(sys, 'frozen', None) != 'macosx_app':
+        # executable version (py2exe) doesn't support __file__
+        return os.path.dirname(pycompat.sysexecutable)
+    else:
+        return os.path.dirname(
+            os.path.dirname(pycompat.fsencode(__file__)))