Hob: Implement Hob config parse hook

To make Hob's specific variable settings take effect, we add a Hob
config hook at the end of parsing for each configuration file, and in
the hook function, Hob will set its own variables to the data store.

This fixes:
[YOCTO #2210]
[YOCTO #2254]

(Bitbake rev: 0ec7d1bbfd2e09ae60f99e6134b20ffd1d9145b1)

Signed-off-by: Dongxiao Xu <dongxiao.xu@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/bb/ui/crumbs/builder.py

@@ -210,6 +210,30 @@ class Parameters:
         self.tmpdir = params["tmpdir"]
         self.enable_proxy = False
 
+def hob_conf_filter(fn, data):
+    if fn.endswith("/local.conf"):
+        distro = data.getVar("DISTRO_HOB")
+        if distro:
+            if distro != "defaultsetup":
+                data.setVar("DISTRO", distro)
+            else:
+                data.delVar("DISTRO")
+
+        keys = ["MACHINE_HOB", "SDKMACHINE_HOB", "PACKAGE_CLASSES_HOB", \
+                "BB_NUMBER_THREADS_HOB", "PARALLEL_MAKE_HOB", "DL_DIR_HOB", \
+                "SSTATE_DIR_HOB", "SSTATE_MIRROR_HOB", "INCOMPATIBLE_LICENSE_HOB"]
+        for key in keys:
+            var_hob = data.getVar(key)
+            if var_hob:
+                data.setVar(key.split("_HOB")[0], var_hob)
+        return
+
+    if fn.endswith("/bblayers.conf"):
+        layers = data.getVar("BBLAYERS_HOB")
+        if layers:
+            data.setVar("BBLAYERS", layers)
+        return
+
 class Builder(gtk.Window):
 
     (MACHINE_SELECTION,
@@ -296,6 +320,8 @@ class Builder(gtk.Window):
         self.handler.connect("command-succeeded",        self.handler_command_succeeded_cb)
         self.handler.connect("command-failed",           self.handler_command_failed_cb)
 
+        self.handler.set_config_filter(hob_conf_filter)
+
         self.initiate_new_build_async()
 
     def create_visual_elements(self):