[OE-core] [PATCH 1/2] recipetool: ignore zero-length setup.py files

[Paul Eggleton]

If a setup.py file exists it ought to have something in it before we
consider the source tree to be a Python module and treating it as such.
(A counter-example is https://www.bro.org/downloads/binpac-0.50.tar.gz -
it's not clear why this has a zero-length setup.py in it but we should
pay no attention to it.)

Fixes [YOCTO #12923].

Signed-off-by: Paul Eggleton <paul.eggleton at linux.intel.com>
---
 scripts/lib/recipetool/create_buildsys_python.py | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/scripts/lib/recipetool/create_buildsys_python.py b/scripts/lib/recipetool/create_buildsys_python.py
index ac9bc9237ce..adfa3779561 100644
--- a/scripts/lib/recipetool/create_buildsys_python.py
+++ b/scripts/lib/recipetool/create_buildsys_python.py
@@ -154,8 +154,13 @@ class PythonRecipeHandler(RecipeHandler):
         if 'buildsystem' in handled:
             return False
 
-        if not RecipeHandler.checkfiles(srctree, ['setup.py']):
-            return
+        # Check for non-zero size setup.py files
+        setupfiles = RecipeHandler.checkfiles(srctree, ['setup.py'])
+        for fn in setupfiles:
+            if os.path.getsize(fn):
+                break
+        else:
+            return False
 
         # setup.py is always parsed to get at certain required information, such as
         # distutils vs setuptools
-- 
2.20.1