[OE-core] [meta-oe][PATCH v2 1/4] context.py: Do not mask exceptions needlessly.

[Paulo Neves]

There were a lot of assumptions in the controller import
code of context.py which were not true anymore.  These
assumptions reflected themselves by catching exceptions and
re-raising them with unhelpful error messages in other parts
of the code.

This commit does not fix the classes controller classes that
became broken after the refactor but at least it allows for
the exceptions to be thrown where the imports fail, thus
actually showing what exactly went wrong with the import.

An example of such an improvement is that before if the
controller class failed during it's init contructor the
controller would just be skipped and the task would just
complain it could not find the controller.  Now for example,
if there is a NamerError due to a variable not being
declared, the user will get that report.

Signed-off-by: Paulo Neves <ptsneves at gmail.com>
---
 meta/lib/oeqa/runtime/context.py | 14 ++++----------
 1 file changed, 4 insertions(+), 10 deletions(-)

diff --git a/meta/lib/oeqa/runtime/context.py b/meta/lib/oeqa/runtime/context.py
index 0294003..a7f3823 100644
--- a/meta/lib/oeqa/runtime/context.py
+++ b/meta/lib/oeqa/runtime/context.py
@@ -112,12 +112,9 @@ class OERuntimeTestContextExecutor(OETestContextExecutor):
             # XXX: Don't base your targets on this code it will be refactored
             # in the near future.
             # Custom target module loading
-            try:
-                target_modules_path = kwargs.get('target_modules_path', '')
-                controller = OERuntimeTestContextExecutor.getControllerModule(target_type, target_modules_path)
-                target = controller(logger, target_ip, server_ip, **kwargs)
-            except ImportError as e:
-                raise TypeError("Failed to import %s from available controller modules" % target_type)
+            target_modules_path = kwargs.get('target_modules_path', '')
+            controller = OERuntimeTestContextExecutor.getControllerModule(target_type, target_modules_path)
+            target = controller(logger, target_ip, server_ip, **kwargs)
 
         return target
 
@@ -173,10 +170,7 @@ class OERuntimeTestContextExecutor(OETestContextExecutor):
     def _loadControllerFromModule(target, modulename):
         obj = None
         # import module, allowing it to raise import exception
-        try:
-            module = __import__(modulename, globals(), locals(), [target])
-        except Exception as e:
-            return obj
+        module = __import__(modulename, globals(), locals(), [target])
         # look for target class in the module, catching any exceptions as it
         # is valid that a module may not have the target class.
         try:
-- 
2.7.4