Add a noderun command

This command enables running various commands against the nodes.
While I was at it, fix permissions on some files in git.

confluent_client/bin/noderun

@@ -0,0 +1,86 @@
+#!/usr/bin/env python
+# vim: tabstop=4 shiftwidth=4 softtabstop=4
+
+# Copyright 2016 Lenovo
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import optparse
+import os
+import select
+import shlex
+import subprocess
+import sys
+
+path = os.path.dirname(os.path.realpath(__file__))
+path = os.path.realpath(os.path.join(path, '..', 'lib', 'python'))
+if path.startswith('/opt'):
+    sys.path.append(path)
+
+import confluent.client as client
+
+
+argparser = optparse.OptionParser(
+    usage="Usage: %prog node commandexpression",
+    epilog="Expressions are the same as in attributes, e.g. "
+           "'ipmitool -H {hardwaremanagement.manager}' will be expanded.")
+argparser.disable_interspersed_args()
+(options, args) = argparser.parse_args()
+if len(args) < 2:
+    argparser.print_help()
+    sys.exit(1)
+c = client.Command()
+cmdstr = " ".join(args[1:])
+
+nodeforpopen = {}
+popens = []
+for exp in c.create('/noderange/{0}/attributes/expression'.format(args[0]),
+                    {'expression': cmdstr}):
+    ex = exp['databynode']
+    for node in ex:
+        cmd = ex[node]['value'].encode('utf-8')
+        cmdv = shlex.split(cmd)
+        nopen = subprocess.Popen(
+            cmdv, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+        popens.append(nopen)
+        nodeforpopen[nopen] = node
+
+all = set([])
+pipedesc = {}
+exitcode = 0
+for pop in popens:
+    node = nodeforpopen[pop]
+    pipedesc[pop.stdout] = { 'node': node, 'popen': pop, 'type': 'stdout'}
+    pipedesc[pop.stderr] = {'node': node, 'popen': pop, 'type': 'stderr'}
+    all.add(pop.stdout)
+    all.add(pop.stderr)
+rdy, _, _ = select.select(all, [], [], 10)
+while all and rdy:
+    for r in rdy:
+        data = r.readline()
+        desc = pipedesc[r]
+        if data:
+            node = desc['node']
+            if desc['type'] == 'stdout':
+                sys.stdout.write('{0}: {1}'.format(node,data))
+            else:
+                sys.stderr.write('{0}: {1}'.format(node, data))
+        else:
+            pop = desc['popen']
+            ret = pop.poll()
+            if ret is not None:
+                exitcode = exitcode | ret
+                all.discard(r)
+    if all:
+        rdy, _, _ = select.select(all, [], [], 10)
+sys.exit(exitcode)