HC2VPP-313: <copy-config> examples using nnclient library

Shows how to configure VPP using nnclient library.

Requires following changes to ODL Netconf (HC2VPP-312):
- <copy-config> support:
  https://git.opendaylight.org/gerrit/#/c/69606/
- various fixes to make ODL Netconf compatible with nnclient:
  https://git.opendaylight.org/gerrit/#/c/71181/

and ncclient library with the following change:
https://github.com/marekgr/ncclient/commit/fbc31b06daf114c11dcb6bf1bcfac9127b2e0062

Change-Id: I3dceb8ead6e6f558a3c76f6c1c3b0ba5f7c52f93
Signed-off-by: Marek Gradzki <mgradzki@cisco.com>
(cherry picked from commit 2e96f3423a2619cd2aa9d188de513723416c15e6)

1 files changed, 107 insertions, 0 deletions

diff --git a/examples/ncclient/xmldiffs.py b/examples/ncclient/xmldiffs.py
new file mode 100755
index 000000000..b78fa8fc9
--- /dev/null
+++ b/examples/ncclient/xmldiffs.py
@@ -0,0 +1,107 @@
+#!/usr/bin/env python
+"""
+Usage: {prog} [OPTION] FILE1 FILE2
+
+Compare two XML files, ignoring element and attribute order.
+
+Any extra options are passed to the `diff' command.
+
+Copyright (c) 2017, Johannes H. Jensen.
+License: BSD, see LICENSE for more details.
+"""
+from __future__ import print_function, unicode_literals
+import sys
+import os
+import io
+import xml.etree.ElementTree as ET
+from tempfile import NamedTemporaryFile
+import subprocess
+
+def attr_str(k, v):
+    return "{}=\"{}\"".format(k,v)
+
+def node_str(n):
+    attrs = sorted(n.attrib.items())
+    astr = " ".join(attr_str(k,v) for k,v in attrs)
+    s = n.tag
+    if astr:
+        s += " " + astr
+    return s
+
+def node_key(n):
+    return node_str(n)
+
+def indent(s, level):
+    return "  " * level + s
+
+def write_sorted(stream, node, level=0):
+    children = node.getchildren()
+    text = (node.text or "").strip()
+    tail = (node.tail or "").strip()
+
+    if children or text:
+        children.sort(key=node_key)
+
+        stream.write(indent("<" + node_str(node) + ">\n", level))
+
+        if text:
+            stream.write(indent(text + "\n", level))
+
+        for child in children:
+            write_sorted(stream, child, level + 1)
+
+        stream.write(indent("</" + node.tag + ">\n", level))
+    else:
+        stream.write(indent("<" + node_str(node) + "/>\n", level))
+
+    if tail:
+        stream.write(indent(tail + "\n", level))
+
+if sys.version_info < (3, 0):
+    # Python 2
+    import codecs
+    def unicode_writer(fp):
+        return codecs.getwriter('utf-8')(fp)
+else:
+    # Python 3
+    def unicode_writer(fp):
+        return fp
+
+def xmldiffs(file1, file2, diffargs=["-u"]):
+    tree = ET.parse(file1)
+    tmp1 = unicode_writer(NamedTemporaryFile('w'))
+    write_sorted(tmp1, tree.getroot())
+    tmp1.flush()
+
+    tree = ET.parse(file2)
+    tmp2 = unicode_writer(NamedTemporaryFile('w'))
+    write_sorted(tmp2, tree.getroot())
+    tmp2.flush()
+
+    args = [ "diff" ]
+    args += diffargs
+    args += [ "--label", file1, "--label", file2 ]
+    args += [ tmp1.name, tmp2.name ]
+
+    return subprocess.call(args)
+
+def print_usage(prog):
+    print(__doc__.format(prog=prog).strip())
+
+if __name__ == '__main__':
+    args = sys.argv
+    prog = os.path.basename(args.pop(0))
+
+    if '-h' in args or '--help' in args:
+        print_usage(prog)
+        exit(0)
+
+    if len(args) < 2:
+        print_usage(prog)
+        exit(1)
+
+    file2 = args.pop(-1)
+    file1 = args.pop(-1)
+    diffargs = args if args else ["-u"]
+
+    exit(xmldiffs(file1, file2, diffargs))