wic: reimplement PluginMgr.get_plugin_methods

Simplified the implementation of get_plugin_methods:
- get rid of looping over the dicrtionary, used access by key instead
- get rid of filling a dictionary that passed as a parameter

(From OE-Core rev: 875d4eede61b548d64f426c2ef077cc17e50cd45)

Signed-off-by: Ed Bartosh <ed.bartosh@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

scripts/lib/wic/help.py

@@ -374,7 +374,7 @@ DESCRIPTION
     This scheme is extensible - adding more hooks is a simple matter
     of adding more plugin methods to SourcePlugin and derived classes.
     The code that then needs to call the plugin methods uses
-    plugin.get_source_plugin_methods() to find the method(s) needed by
+    plugin.get_plugin_methods() to find the method(s) needed by
     the call; this is done by filling up a dict with keys containing
     the method names of interest - on success, these will be filled in
     with the actual methods. Please see the implementation for

scripts/lib/wic/partition.py

@@ -170,14 +170,11 @@ class Partition():
             splitted = self.sourceparams.split(',')
             srcparams_dict = dict(par.split('=') for par in splitted if par)
 
-        partition_methods = {
-            "do_stage_partition": None,
-            "do_prepare_partition": None,
-            "do_configure_partition": None
-        }
+        partition_methods = ["do_configure_partition", "do_stage_partition",
+                             "do_prepare_partition"]
 
-        methods = PluginMgr.get_source_plugin_methods(self.source,
-                                                      partition_methods)
+        methods = PluginMgr.get_plugin_methods('source', self.source,
+                                               partition_methods)
         methods["do_configure_partition"](self, srcparams_dict, creator,
                                           cr_workdir, oe_builddir, bootimg_dir,
                                           kernel_dir, native_sysroot)

scripts/lib/wic/plugin.py

@@ -109,22 +109,18 @@ class PluginMgr:
         return pluginbase.get_plugins(ptype)
 
     @classmethod
-    def get_source_plugin_methods(cls, source_name, methods):
+    def get_plugin_methods(cls, ptype, pname, methods):
         """
         The methods param is a dict with the method names to find.  On
         return, the dict values will be filled in with pointers to the
         corresponding methods.  If one or more methods are not found,
         None is returned.
         """
-        return_methods = None
-        for _source_name, klass in cls.get_plugins('source').items():
-            if _source_name == source_name:
-                for _method_name in methods:
-                    if not hasattr(klass, _method_name):
-                        logger.warning("Unimplemented %s source interface for: %s",
-                                       _method_name, _source_name)
-                        return None
-                    func = getattr(klass, _method_name)
-                    methods[_method_name] = func
-                    return_methods = methods
-        return return_methods
+        result = {}
+        plugin = cls.get_plugins(ptype).get(pname)
+        for method in methods:
+            if not hasattr(plugin, method):
+                raise WicError("Unimplemented %s plugin interface for: %s" %
+                               (method, pname))
+            result[method] = getattr(plugin, method)
+        return result

scripts/lib/wic/plugins/imager/direct.py

@@ -198,11 +198,11 @@ class DirectPlugin(ImagerPlugin):
         disk_name = self.parts[0].disk
         if source_plugin:
             name = "do_install_disk"
-            methods = PluginMgr.get_source_plugin_methods(source_plugin,
-                                                          {name: None})
-            methods["do_install_disk"](self._image, disk_name, self, self.workdir,
-                                       self.oe_builddir, self.bootimg_dir,
-                                       self.kernel_dir, self.native_sysroot)
+            method = PluginMgr.get_plugin_methods('source', source_plugin,
+                                                   [name])[name]
+            method(self._image, disk_name, self, self.workdir,
+                   self.oe_builddir, self.bootimg_dir,
+                   self.kernel_dir, self.native_sysroot)
 
         full_path = self._image.path
         # Generate .bmap