This might actually work. It's an incremental improvement at best.

diff --git a/lib/cmdlib/cluster.py b/lib/cmdlib/cluster.py
index 7d15c36..09cea79 100644
--- a/lib/cmdlib/cluster.py
+++ b/lib/cmdlib/cluster.py
@@ -1163,44 +1163,7 @@ class LUClusterSetParams(LogicalUnit):
               self.new_os_hvp[os_name][hv_name].update(hv_dict)

     # os parameters
-    self.new_osp = objects.FillDict(cluster.osparams, {})
-    if self.op.osparams:
-      for os_name, osp in self.op.osparams.items():
-        if os_name not in self.new_osp:
-          self.new_osp[os_name] = {}
-
-        self.new_osp[os_name] = GetUpdatedParams(self.new_osp[os_name], osp,
-                                                 use_none=True)
-
-        if not self.new_osp[os_name]:
-          # we removed all parameters
-          del self.new_osp[os_name]
-
-    # private os params
-    self.new_osp_private = objects.FillDict(cluster.osparams_private_cluster,
-                                            {})
-    if self.op.osparams_private_cluster:
-      for os_name, osp in self.op.osparams_private_cluster.items():
-        if os_name not in self.new_osp_private:
-          self.new_osp_private[os_name] = {}
-
-        self.new_osp_private[os_name] = GetUpdatedParams(
-          self.new_osp_private[os_name], osp, use_none=True
-        )
-
-        if not self.new_osp_private[os_name]:
-          # we removed all parameters
-          del self.new_osp_private[os_name]
-
-    # Remove os validity check
-    changed_oses = (set(self.new_osp.keys()) |
set(self.new_osp_private.keys()))
-    for os_name in changed_oses:
-      os_params = cluster.SimpleFillOS(os_name,
-                                       self.new_osp.get(os_name, {}),
-                                       self.new_osp_private.get(os_name, {}))
-      # check the parameter validity (remote check)
-      CheckOSParams(self, False, [self.cfg.GetMasterNode()],
-                    os_name, os_params)
+    self._BuildOSParams(cluster)

     # changes to the hypervisor list
     if self.op.enabled_hypervisors is not None:
@@ -1254,6 +1217,37 @@ class LUClusterSetParams(LogicalUnit):
                                    " specified" % self.op.default_iallocator,
                                    errors.ECODE_INVAL)

+  def _BuildOSParams(self, cluster):
+    "Calculate the new OS parameters for this operation."
+
+    def _GetNewParams(source, new_params):
+      "Wrapper around GetUpdatedParams."
+      if new_params is None:
+        return source
+      result = objects.FillDict(source, {}) # deep copy of source
+      for os_name in new_params:
+        result[os_name] = GetUpdatedParams(result.get(os_name, {}),
+                                           new_params[os_name],
+                                           use_none=True)
+        if not result[os_name]:
+          del result[os_name] # we removed all parameters
+      return result
+
+    self.new_osp = _GetNewParams(cluster.osparams,
+                                 self.op.osparams)
+    self.new_osp_private = _GetNewParams(cluster.osparams_private_cluster,
+                                         self.op.osparams_private_cluster)
+
+    # Remove os validity check
+    changed_oses = (set(self.new_osp.keys()) |
set(self.new_osp_private.keys()))
+    for os_name in changed_oses:
+      os_params = cluster.SimpleFillOS(os_name,
+                                       self.new_osp.get(os_name, {}),
+                                       self.new_osp_private.get(os_name, {}))
+      # check the parameter validity (remote check)
+      CheckOSParams(self, False, [self.cfg.GetMasterNode()],
+                    os_name, os_params)
+
   def _CheckDiskTemplateConsistency(self):
     """Check whether the disk templates that are going to be disabled
        are still in use by some instances.

On Wed, Feb 5, 2014 at 11:28 PM, Santi Raffa <[email protected]> wrote:
> On Wed, Feb 5, 2014 at 6:46 PM, Jose A. Lopes <[email protected]> wrote:
>>> -        else:
>>> -          # check the parameter validity (remote check)
>>> -          CheckOSParams(self, False, [self.cfg.GetMasterNode()],
>>> -                        os_name, self.new_osp[os_name])
>>> +
>>> +    # private os params
>>> +    self.new_osp_private = 
>>> objects.FillDict(cluster.osparams_private_cluster,
>>> +                                            {})
>>> +    if self.op.osparams_private_cluster:
>>> +      for os_name, osp in self.op.osparams_private_cluster.items():
>>> +        if os_name not in self.new_osp_private:
>>> +          self.new_osp_private[os_name] = {}
>>> +
>>> +        self.new_osp_private[os_name] = GetUpdatedParams(
>>> +          self.new_osp_private[os_name], osp, use_none=True
>>> +        )
>>> +
>>> +        if not self.new_osp_private[os_name]:
>>> +          # we removed all parameters
>>> +          del self.new_osp_private[os_name]
>>> +
>>
>> Can we extract the code above to a separate function/method and thus
>> avoid the code duplication for osparams and private osparams?
>
> This refactoring makes me quite nervous. This is my best shot at it. I
> have not tested it.
>
> diff --git a/lib/cmdlib/cluster.py b/lib/cmdlib/cluster.py
> index 7d15c36..f9da4aa 100644
> --- a/lib/cmdlib/cluster.py
> +++ b/lib/cmdlib/cluster.py
> @@ -1163,44 +1163,7 @@ class LUClusterSetParams(LogicalUnit):
>                self.new_os_hvp[os_name][hv_name].update(hv_dict)
>
>      # os parameters
> -    self.new_osp = objects.FillDict(cluster.osparams, {})
> -    if self.op.osparams:
> -      for os_name, osp in self.op.osparams.items():
> -        if os_name not in self.new_osp:
> -          self.new_osp[os_name] = {}
> -
> -        self.new_osp[os_name] = GetUpdatedParams(self.new_osp[os_name], osp,
> -                                                 use_none=True)
> -
> -        if not self.new_osp[os_name]:
> -          # we removed all parameters
> -          del self.new_osp[os_name]
> -
> -    # private os params
> -    self.new_osp_private = objects.FillDict(cluster.osparams_private_cluster,
> -                                            {})
> -    if self.op.osparams_private_cluster:
> -      for os_name, osp in self.op.osparams_private_cluster.items():
> -        if os_name not in self.new_osp_private:
> -          self.new_osp_private[os_name] = {}
> -
> -        self.new_osp_private[os_name] = GetUpdatedParams(
> -          self.new_osp_private[os_name], osp, use_none=True
> -        )
> -
> -        if not self.new_osp_private[os_name]:
> -          # we removed all parameters
> -          del self.new_osp_private[os_name]
> -
> -    # Remove os validity check
> -    changed_oses = (set(self.new_osp.keys()) |
> set(self.new_osp_private.keys()))
> -    for os_name in changed_oses:
> -      os_params = cluster.SimpleFillOS(os_name,
> -                                       self.new_osp.get(os_name, {}),
> -                                       self.new_osp_private.get(os_name, {}))
> -      # check the parameter validity (remote check)
> -      CheckOSParams(self, False, [self.cfg.GetMasterNode()],
> -                    os_name, os_params)
> +    self._BuildOSParams(cluster, os_name)
>
>      # changes to the hypervisor list
>      if self.op.enabled_hypervisors is not None:
> @@ -1254,6 +1217,35 @@ class LUClusterSetParams(LogicalUnit):
>                                     " specified" % self.op.default_iallocator,
>                                     errors.ECODE_INVAL)
>
> +  def _BuildOSParams(self, cluster, os_name):
> +    "Calculate the new OS parameters for this operation."
> +
> +    def _GetNewParams(source, new_params):
> +      "Wrapper around GetUpdatedParams."
> +      result = objects.FillDict(source, {}) # deep copy of source
> +      for os_name in new_params:
> +        result[os_name] = GetUpdatedParams(result.get(os_name, {}),
> +                                           new_params[os_name],
> +                                           use_none=True)
> +        if not result[os_name]:
> +          del result[os_name] # we removed all parameters
> +      return result
> +
> +    self.new_osp = _GetNewParams(cluster.osparams,
> +                                 self.op.osparams)
> +    self.new_osp_private = _GetNewParams(cluster.osparams_private_cluster,
> +                                         self.op.osparams_private_cluster)
> +
> +    # Remove os validity check
> +    changed_oses = (set(self.new_osp.keys()) |
> set(self.new_osp_private.keys()))
> +    for os_name in changed_oses:
> +      os_params = cluster.SimpleFillOS(os_name,
> +                                       self.new_osp.get(os_name, {}),
> +                                       self.new_osp_private.get(os_name, {}))
> +      # check the parameter validity (remote check)
> +      CheckOSParams(self, False, [self.cfg.GetMasterNode()],
> +                    os_name, os_params)
> +
>    def _CheckDiskTemplateConsistency(self):
>      """Check whether the disk templates that are going to be disabled
>         are still in use by some instances.
>
>
> --
> Raffa Santi
> Google Germany GmbH
> Dienerstr. 12
> 80331 München
>
>
> Registergericht und -nummer: Hamburg, HRB 86891
> Sitz der Gesellschaft: Hamburg
> Geschäftsführer: Graham Law, Christine Elizabeth Flores



-- 
Raffa Santi
Google Germany GmbH
Dienerstr. 12
80331 München


Registergericht und -nummer: Hamburg, HRB 86891
Sitz der Gesellschaft: Hamburg
Geschäftsführer: Graham Law, Christine Elizabeth Flores

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