[PATCH 2/2] wic: add support to look in all layers and get plugins

["João Henrique Ferreira de Freitas" <joaohf@gmail.com>]

Plugins are looked in 'scripts/lib/mic/plugins/[type]/' directory on all
BBLAYERS variable returned by bitbake environment. If found, it will
be load at runtime.

The user could create your own plugin and keep it inside its layers. For
now the path must be <layer-dir>/scripts/lib/mic/plugins/[type]/. Where
'type' could be 'imager' or 'source'.

Signed-off-by: João Henrique Ferreira de Freitas <joaohf@gmail.com>
---
 scripts/lib/mic/plugin.py | 28 +++++++++++++++++++++++-----
 1 file changed, 23 insertions(+), 5 deletions(-)

diff --git a/scripts/lib/mic/plugin.py b/scripts/lib/mic/plugin.py
index df03c15..bec33d6 100644
--- a/scripts/lib/mic/plugin.py
+++ b/scripts/lib/mic/plugin.py
@@ -20,12 +20,14 @@ import os, sys
 from mic import msger
 from mic import pluginbase
 from mic.utils import errors
-
+from mic.utils.oe.misc import *
 
 __ALL__ = ['PluginMgr', 'pluginmgr']
 
 PLUGIN_TYPES = ["imager", "source"] # TODO  "hook"
 
+PLUGIN_DIR = "/lib/mic/plugins" # relative to scripts
+SCRIPTS_PLUGIN_DIR = "scripts" + PLUGIN_DIR
 
 class PluginMgr(object):
     plugin_dirs = {}
@@ -42,8 +44,23 @@ class PluginMgr(object):
         mic_path = os.path.dirname(__file__)
         eos = mic_path.find('scripts') + len('scripts')
         scripts_path = mic_path[:eos]
+        self.scripts_path = scripts_path
+        self.plugin_dir = scripts_path + PLUGIN_DIR
+        self.layers_path = None
+
+    def _build_plugin_dir_list(self, dl, ptype):
+        if self.layers_path is None:
+            self.layers_path = get_bitbake_var("BBLAYERS")
+        layer_dirs = []
+
+        for layer_path in self.layers_path.split():
+            path = os.path.join(layer_path, SCRIPTS_PLUGIN_DIR, ptype)
+            layer_dirs.append(path)
 
-        self.plugin_dir = scripts_path + "/lib/mic/plugins"
+            path = os.path.join(dl, ptype)
+            layer_dirs.append(path)
+
+        return layer_dirs
 
     def append_dirs(self, dirs):
         for path in dirs:
@@ -56,7 +73,7 @@ class PluginMgr(object):
         path = os.path.abspath(os.path.expanduser(path))
 
         if not os.path.isdir(path):
-            msger.warning("Plugin dir is not a directory or does not exist: %s"\
+            msger.debug("Plugin dir is not a directory or does not exist: %s"\
                           % path)
             return
 
@@ -93,8 +110,9 @@ class PluginMgr(object):
         if ptype not in PLUGIN_TYPES:
             raise errors.CreatorError('%s is not valid plugin type' % ptype)
 
-        self._add_plugindir(os.path.join(self.plugin_dir, ptype))
-        self._load_all()
+        plugins_dir = self._build_plugin_dir_list(self.plugin_dir, ptype)
+
+        self.append_dirs(plugins_dir)
 
         return pluginbase.get_plugins(ptype)
 
-- 
1.8.3.2