Default to systemwide installation for kernelspecs

IPython/kernel/kernelspec.py

@@ -143,16 +143,17 b' class KernelSpecManager(HasTraits):'
             raise NoSuchKernel(kernel_name)
         return KernelSpec.from_resource_dir(resource_dir)
     
-    def _get_destination_dir(self, kernel_name, system=False):
-        if system:
+    def _get_destination_dir(self, kernel_name, user=False):
+        if user:
+            return os.path.join(self.user_kernel_dir, kernel_name)
+        else:
             if SYSTEM_KERNEL_DIRS:
                 return os.path.join(SYSTEM_KERNEL_DIRS[-1], kernel_name)
             else:
                 raise EnvironmentError("No system kernel directory is available")
-        else:
-            return os.path.join(self.user_kernel_dir, kernel_name)
 
-    def install_kernel_spec(self, source_dir, kernel_name=None, system=False,
+
+    def install_kernel_spec(self, source_dir, kernel_name=None, user=False,
                             replace=False):
         """Install a kernel spec by copying its directory.
         
@@ -171,14 +172,14 b' class KernelSpecManager(HasTraits):'
             kernel_name = os.path.basename(source_dir)
         kernel_name = kernel_name.lower()
         
-        destination = self._get_destination_dir(kernel_name, system=system)
+        destination = self._get_destination_dir(kernel_name, user=user)
 
         if replace and os.path.isdir(destination):
             shutil.rmtree(destination)
 
         shutil.copytree(source_dir, destination)
 
-    def install_native_kernel_spec(self, system=False):
+    def install_native_kernel_spec(self, user=False):
         """Install the native kernel spec to the filesystem
         
         This allows a Python 3 frontend to use a Python 2 kernel, or vice versa.
@@ -189,7 +190,7 b' class KernelSpecManager(HasTraits):'
         kernel registry. If the process does not have appropriate permissions, 
         an :exc:`OSError` will be raised.
         """
-        path = self._get_destination_dir(NATIVE_KERNEL_NAME, system=system)
+        path = self._get_destination_dir(NATIVE_KERNEL_NAME, user=user)
         os.makedirs(path, mode=0o755)
         with open(pjoin(path, 'kernel.json'), 'w') as f:
             json.dump(self._native_kernel_dict, f, indent=1)
@@ -209,13 +210,13 b' def get_kernel_spec(kernel_name):'
     """
     return KernelSpecManager().get_kernel_spec(kernel_name)
 
-def install_kernel_spec(source_dir, kernel_name=None, system=False, replace=False):
+def install_kernel_spec(source_dir, kernel_name=None, user=False, replace=False):
     return KernelSpecManager().install_kernel_spec(source_dir, kernel_name,
-                                                    system, replace)
+                                                    user, replace)
 
 install_kernel_spec.__doc__ = KernelSpecManager.install_kernel_spec.__doc__
 
-def install_native_kernel_spec(self, system=False):
-    return KernelSpecManager().install_native_kernel_spec(system=system)
+def install_native_kernel_spec(user=False):
+    return KernelSpecManager().install_native_kernel_spec(user=user)
 
 install_native_kernel_spec.__doc__ = KernelSpecManager.install_native_kernel_spec.__doc__