target/manager: Allow specifying usage of target_info cache

Allow disabling of the usage of the target_info cache. This is
useful when running on a one-off target and there is no benefit
of using caching the target information.

wa/framework/target/manager.py

@@ -37,6 +37,11 @@ class TargetManager(object):
                   Specifies whether the target should be disconnected from
                   at the end of the run.
                   """),
+        Parameter('cache_target_info', kind=bool, default=True,
+                  description="""
+                  Configure whether the cache should be used when collecting
+                  target information.
+                  """),
     ]
 
     def __init__(self, name, parameters, outdir):
@@ -50,6 +55,7 @@ def __init__(self, name, parameters, outdir):
         self.rpm = None
         self.parameters = parameters
         self.disconnect = parameters.get('disconnect')
+        self.cache_target_info = parameters.get('cache_target_info')
 
     def initialize(self):
         self._init_target()
@@ -89,18 +95,21 @@ def extract_results(self, context):
 
     @memoized
     def get_target_info(self):
-        info = get_target_info_from_cache(self.target.system_id)
+        if self.cache_target_info:
+            info = get_target_info_from_cache(self.target.system_id)
 
-        if info is None:
-            info = get_target_info(self.target)
-            cache_target_info(info)
-        else:
-            # If module configuration has changed form when the target info
-            # was previously cached, it is possible additional info will be
-            # available, so should re-generate the cache.
-            if module_name_set(info.modules) != module_name_set(self.target.modules):
+            if info is None:
                 info = get_target_info(self.target)
-                cache_target_info(info, overwrite=True)
+                cache_target_info(info)
+            else:
+                # If module configuration has changed form when the target info
+                # was previously cached, it is possible additional info will be
+                # available, so should re-generate the cache.
+                if module_name_set(info.modules) != module_name_set(self.target.modules):
+                    info = get_target_info(self.target)
+                    cache_target_info(info, overwrite=True)
+        else:
+            info = get_target_info(self.target)
 
         return info