Add referred parts' hash strings in __buildout_signature__, that invokes...

Add referred parts' hash strings in __buildout_signature__, that invokes rebuild of a part when one of its (recursive) dependencies are modified.

Also remove duplicates and sort entries in __buildout_signature__.

CHANGES.SlapOS.txt

+1.6.0-dev-SlapOS-013
+--------------------
+
+- Add referred parts' hash strings in __buildout_signature__, that invokes
+  rebuild of a part when one of its (recursive) dependencies are modified.
+
 1.6.0-dev-SlapOS-012
 --------------------
 

src/zc/buildout/buildout.py

@@ -933,7 +933,10 @@ class Buildout(UserDict.DictMixin):
                 options = self[part] = {}
             recipe, entry = _recipe(options)
             req = pkg_resources.Requirement.parse(recipe)
-            sig = _dists_sig(pkg_resources.working_set.resolve([req]))
+            sig = sorted(set(_dists_sig(pkg_resources.working_set.resolve([req]))))
+            for dependency in sorted(getattr(options, '_dependency', [])):
+                dependency_hash = md5(repr(self.get(dependency))).hexdigest()
+                sig.append('%s:%s' % (dependency, dependency_hash))
             options['__buildout_signature__'] = ' '.join(sig)
 
     def _read_installed_part_options(self):
@@ -1372,6 +1375,7 @@ class Options(UserDict.DictMixin):
         self._raw = data
         self._cooked = {}
         self._data = {}
+        self._dependency = set([])
 
     def _initialize(self):
         name = self.name
@@ -1503,6 +1507,8 @@ class Options(UserDict.DictMixin):
             section, option = s
             if not section:
                 section = self.name
+            elif section != 'buildout':
+                self._dependency.add(section)
             v = self.buildout[section].get(option, None, seen,
                                            lastlevel=lastlevel)
             if v is None: