Fix small prefix bug + jsonp tests.

Fix the wrong usage of the prefix removal array action
by just using the new util function that does these
actions correctly. 

Add in a couple of unit tests to verify the jsonp merging
and usage works as expected.

cloudinit/handlers/cloud_config.py

@@ -116,13 +116,12 @@ class CloudConfigPartHandler(handlers.Handler):
         return (payload_yaml, all_mergers)
 
     def _merge_patch(self, payload):
+        # JSON doesn't handle comments in this manner, so ensure that
+        # if we started with this 'type' that we remove it before
+        # attempting to load it as json (which the jsonpatch library will
+        # attempt to do).
         payload = payload.lstrip()
-        if payload.lower().startswith(JSONP_PREFIX):
+        payload = util.strip_prefix_suffix(payload, prefix=JSONP_PREFIX)
-            # JSON doesn't handle comments in this manner, so ensure that
-            # if we started with this 'type' that we remove it before
-            # attempting to load it as json (which the jsonpatch library will
-            # attempt to do).
-            payload = payload[JSONP_PREFIX:]
         patch = jsonpatch.JsonPatch.from_string(payload)
         LOG.debug("Merging by applying json patch %s", patch)
         self.cloud_buf = patch.apply(self.cloud_buf, in_place=False)

tests/unittests/test_userdata.py

@@ -6,6 +6,7 @@ import logging
 import os
 
 from email.mime.base import MIMEBase
+from email.mime.multipart import MIMEMultipart
 
 from cloudinit import handlers
 from cloudinit import helpers as c_helpers
@@ -50,6 +51,64 @@ class TestConsumeUserData(helpers.FilesystemMockingTestCase):
         self._log.addHandler(self._log_handler)
         return log_file
 
+    def test_simple_jsonp(self):
+        blob = '''
+#cloud-config-jsonp
+[
+     { "op": "add", "path": "/baz", "value": "qux" },
+     { "op": "add", "path": "/bar", "value": "qux2" }
+]
+'''
+
+        ci = stages.Init()
+        ci.datasource = FakeDataSource(blob)
+        new_root = self.makeDir()
+        self.patchUtils(new_root)
+        self.patchOS(new_root)
+        ci.fetch()
+        ci.consume_userdata()
+        cc_contents = util.load_file(ci.paths.get_ipath("cloud_config"))
+        cc = util.load_yaml(cc_contents)
+        self.assertEquals(2, len(cc))
+        self.assertEquals('qux', cc['baz'])
+        self.assertEquals('qux2', cc['bar'])
+
+    def test_mixed_cloud_config(self):
+        blob_cc = '''
+#cloud-config
+a: b
+c: d
+'''
+        message_cc = MIMEBase("text", "cloud-config")
+        message_cc.set_payload(blob_cc)
+
+        blob_jp = '''
+#cloud-config-jsonp
+[
+     { "op": "replace", "path": "/a", "value": "c" },
+     { "op": "remove", "path": "/c" }
+]
+'''
+
+        message_jp = MIMEBase('text', "cloud-config-jsonp")
+        message_jp.set_payload(blob_jp)
+
+        message = MIMEMultipart()
+        message.attach(message_cc)
+        message.attach(message_jp)
+
+        ci = stages.Init()
+        ci.datasource = FakeDataSource(str(message))
+        new_root = self.makeDir()
+        self.patchUtils(new_root)
+        self.patchOS(new_root)
+        ci.fetch()
+        ci.consume_userdata()
+        cc_contents = util.load_file(ci.paths.get_ipath("cloud_config"))
+        cc = util.load_yaml(cc_contents)
+        self.assertEquals(1, len(cc))
+        self.assertEquals('c', cc['a'])
+
     def test_merging_cloud_config(self):
         blob = '''
 #cloud-config