sysroot: add a set of base system files

util/lib/manifest.py

@@ -58,19 +58,21 @@ class Component:
 class Manifest:
     def __init__(self, path):
         self.path = path
+        self.base = None
         self.components = {}
 
     def load(self):
             with open(self.path, 'r') as f:
                 self.data = json.load(f)
 
-            if 'components' not in self.data:
-                return 0
+            if 'components' in self.data:
+                for n, t in self.data['components'].items():
+                    component = Component()
+                    component.deserialise(t)
+                    self.components[n] = component
 
-            for n, t in self.data['components'].items():
-                component = Component()
-                component.deserialise(t)
-                self.components[n] = component
+            if 'base' in self.data:
+                self.base = self.data['base']
 
 
     def save(self):
@@ -81,6 +83,9 @@ class Manifest:
 
             self.data['components'] = component_data
 
+            if self.base is not None:
+                self.data['base'] = self.base
+
             with open(self.path, 'w') as f:
                 json.dump(self.data, f, indent=4)
 
@@ -97,5 +102,14 @@ class Manifest:
         self.components[name] = component
         return component
 
+
+    def set_base(self, path):
+        self.base = path
+
+
+    def get_base(self):
+        return self.base
+
+
     def get_all_components(self):
         return self.components