Added limit to image-list in a preparatory step toward addressing bug 1001345.

Currently novaclient doesn't use the limit or marker params.
As a step to addressing bug 1001345 which requires pagination,
this patch introduces the use of limit as an option
passed to the image-list function.

Change-Id: Ia32f9e923b4eb9bcdde3b7bc1722c59d7791d104

novaclient/v1_1/images.py

@@ -2,6 +2,7 @@
 """
 Image interface.
 """
+import urllib
 
 from novaclient import base
 
@@ -37,16 +38,21 @@ class ImageManager(base.ManagerWithFind):
         """
         return self._get("/images/%s" % base.getid(image), "image")
 
-    def list(self, detailed=True):
+    def list(self, detailed=True, limit=None):
         """
         Get a list of all images.
 
         :rtype: list of :class:`Image`
+        :param limit: maximum number of images to return.
         """
-        if detailed is True:
-            return self._list("/images/detail", "images")
-        else:
-            return self._list("/images", "images")
+        params = {}
+        detail = ''
+        if detailed:
+            detail = '/detail'
+        if limit:
+            params['limit'] = int(limit)
+        query = '?%s' % urllib.urlencode(params) if params else ''
+        return self._list('/images%s%s' % (detail, query), 'images')
 
     def delete(self, image):
         """

novaclient/v1_1/shell.py

@@ -712,9 +712,14 @@ def do_network_create(cs, args):
     cs.networks.create(**kwargs)
 
 
+@utils.arg('--limit',
+     dest="limit",
+     metavar="<limit>",
+     help='number of images to return per request')
 def do_image_list(cs, _args):
     """Print a list of available images to boot from."""
-    image_list = cs.images.list()
+    limit = _args.limit
+    image_list = cs.images.list(limit=limit)
 
     def parse_server_name(image):
         try:

tests/v1_1/test_images.py

@@ -18,6 +18,10 @@ class ImagesTest(utils.TestCase):
         cs.assert_called('GET', '/images')
         [self.assertTrue(isinstance(i, images.Image)) for i in il]
 
+    def test_list_images_with_limit(self):
+        il = cs.images.list(limit=4)
+        cs.assert_called('GET', '/images/detail?limit=4')
+
     def test_get_image_details(self):
         i = cs.images.get(1)
         cs.assert_called('GET', '/images/1')