Include part signature inside shared signature

slapos/recipe/cmmi/__init__.py

@@ -40,6 +40,16 @@ class Recipe(object):
             self.original_options = options.copy()
             options.update(platform_options)
 
+        environment_section = options.get('environment-section')
+        self.environ = (
+            buildout[environment_section].copy()
+            if environment_section else {})
+
+        # Trigger computation of part signature for shared signature.
+        # From now on, we should not pull new dependencies.
+        # Ignore if buildout is too old.
+        options.get('__buildout_signature__')
+
         shared = ((options.get('shared', '').lower() == 'true') and
                   buildout['buildout'].get('shared-part-list', None))
         if shared:
@@ -98,13 +108,7 @@ class Recipe(object):
             if '@@LOCATION@@' in v:
                 options[k] = v.replace('@@LOCATION@@', location)
 
-        self.environ = {}
         self.original_environment = os.environ.copy()
-
-        environment_section = self.options.get('environment-section', '').strip()
-        if environment_section and environment_section in buildout:
-            # Use environment variables from the designated config section.
-            self.environ.update(buildout[environment_section])
         for variable in options.get('environment', '').splitlines():
             if variable.strip():
                 try: