Use a list of url formats for downloading the appropriate touch image manifest for a given release.

boottest.py

@@ -69,22 +69,33 @@ class TouchManifest(object):
         self._manifest = self._load()
 
     def __fetch_manifest(self, project, series):
-        url = "http://cdimage.ubuntu.com/{}/daily-preinstalled/" \
-              "pending/{}-preinstalled-touch-armhf.manifest".format(
-                  project, series
-        )
+        # There are two url formats that may lead to the proper manifest
+        # file. The first form is for series that have been released,
+        # the second form is for the current development series.
+        # Only one of these is expected to exist for any given series.
+        url_list = [
+            "http://cdimage.ubuntu.com/{}/{}/daily-preinstalled/pending/" \
+            "{}-preinstalled-touch-armhf.manifest".format(
+                project, series, series),
+            "http://cdimage.ubuntu.com/{}/daily-preinstalled/pending/" \
+            "{}-preinstalled-touch-armhf.manifest".format(
+                project, series),
+        ]
+
         success = False
+        for url in url_list:
             if self.verbose:
-            print(
-                "I: [%s] - Fetching manifest from %s" % (
-                    time.asctime(), url))
-            print("I: [%s] - saving it to %s" % (time.asctime(), self.path))
+                print("I: [%s] - Fetching manifest from %s" %
+                      (time.asctime(), url))
+                print("I: [%s] - saving it to %s" %
+                      (time.asctime(), self.path))
             try:
                 response = urllib.urlopen(url)
+                if response.code == 200:
+                    break
             except IOError as e:
                 print("W: [%s] - error connecting to %s: %s" % (
                         time.asctime(), self.path, e))
-            return success  # failure
 
         # Only [re]create the manifest file if one was successfully downloaded
         # this allows for an existing image to be used if the download fails.