diff --git a/mercurial/utils/procutil.py b/mercurial/utils/procutil.py
--- a/mercurial/utils/procutil.py
+++ b/mercurial/utils/procutil.py
@@ -537,9 +537,13 @@
             # continue the hg process here.
             os._exit(returncode)
 
+def executablerelativeresources():
+    """Whether data/resource files are relative to the current executable."""
+    return mainfrozen() and getattr(sys, 'frozen', None) != 'macosx_app'
+
 def datapath():
     """Return location of data/resource files that are part of the source."""
-    if mainfrozen() and getattr(sys, 'frozen', None) != 'macosx_app':
+    if executablerelativeresources():
         # executable version (py2exe) doesn't support __file__
         return os.path.dirname(pycompat.sysexecutable)
     else: