storyboard: Allow run_command on multiple nodes

It can now take a list of node names.  Also fixes sudo in ssh_support,
which I accidentally broke in the previous commit.

2 files changed, 18 insertions, 13 deletions

diff --git a/rumba/ssh_support.py b/rumba/ssh_support.py
index e23a18e..06e7699 100644
--- a/rumba/ssh_support.py
+++ b/rumba/ssh_support.py
@@ -406,7 +406,7 @@ def aptitude_install(testbed, node, packages):
             return s
     else:
         def sudo(s):
-            return 'sudo' + s
+            return 'sudo ' + s
 
     package_install = " DEBIAN_FRONTEND=noninteractive apt-get install "
     for package in packages:
diff --git a/rumba/storyboard.py b/rumba/storyboard.py
index c6da6cb..6d9739c 100644
--- a/rumba/storyboard.py
+++ b/rumba/storyboard.py
@@ -729,25 +729,30 @@ class StoryBoard(_SBEntity):
         action = functools.partial(self.run_command, node, command)
         self._script.add_event(Event(action, ev_time=t))
 
-    def run_command(self, node, command):
+    def run_command(self, nodes, command):
         """
-        Runs a command (or several) on a given node, immediately.
+        Runs a command (or several) on a given (set of) node(s), immediately.
 
-        :param node: the node on which the command should be run
-        :type node: `rumba.model.Node` or `str`
+        :param nodes: the nodes on which the command should be run
+        :type nodes: `rumba.model.Node` or `str` or a list of these
         :param command: the command(s) to be run
         :type command: `str` or `list` of `str`
         """
         if self.experiment is None:
             raise ValueError("Experiment needed to run commands.")
-        if isinstance(node, str):
-            node = self.node_map[node]
-        if node not in self.experiment.nodes:
-            raise ValueError('Cannot run command on node %s, '
-                             'not in experiment.' % (node.name,))
-        if isinstance(command, str):
-            command = [command]
-        node.execute_commands(command)
+        if not isinstance(nodes, list):
+            _nodes = [nodes]
+        else:
+            _nodes = nodes
+        for _node in _nodes:
+            if isinstance(_node, str):
+                _node = self.node_map[_node]
+            if _node not in self.experiment.nodes:
+                raise ValueError('Cannot run command on node %s, '
+                                 'not in experiment.' % (_node.name,))
+            if isinstance(command, str):
+                command = [command]
+            _node.execute_commands(command)
 
     def add_event(self, event):
         """