Import patches-unapplied version 2.2.6-0ubuntu1 to ubuntu/zesty-proposed

Imported using git-ubuntu import.

Changelog parent: d064ab0bffd429382ea4fafeb144784d403848bd

New changelog entries:
  * New upstream release (LP: #1661750).
  * debian/control:
    - Change the maintainer to Ubuntu Developers (LP: #1657528).
    - Add the dependency of isc-dhcp-client as our maintainer scripts assume
      it's installed.
    - Add trailing commas to dependencies, add whitespaces.
  * Rename ephemeral-disk-warning.sh to ephemeral-disk-warning (lintian error).
  * debian/docs:
    - Remove LICENSE.txt as it's redundant.
  * debian/postinst:
    - Stop checking for update-initramfs existence using the absolute path, use
      the 'command' command instead to make lintian happy.
  * Remove debian/patches/disable-auto-update.patch:
    - We now ship with auto-updates enabled (LP: #1650522).
  * debian/maintscript:
    - Add a maintscript to rename the old logrotate file on upgrade from an
      ancient version of walinuxagent (LP: #1673152).

1 files changed, 10 insertions, 6 deletions

diff --git a/azurelinuxagent/ga/update.py b/azurelinuxagent/ga/update.py
index 996484b..59bc70c 100644
--- a/azurelinuxagent/ga/update.py
+++ b/azurelinuxagent/ga/update.py
@@ -701,11 +701,15 @@ class GuestAgent(object):
             if self._fetch(uri.uri):
                 break
             else:
-                if self.host is not None:
-                    logger.info("Download unsuccessful, falling back to host plugin")
+                if self.host is not None and self.host.ensure_initialized():
+                    logger.warn("Download unsuccessful, falling back to host plugin")
                     uri, headers = self.host.get_artifact_request(uri.uri, self.host.manifest_uri)
-                    if self._fetch(uri, headers=headers):
+                    if uri is not None \
+                            and headers is not None \
+                            and self._fetch(uri, headers=headers):
                         break
+                else:
+                    logger.warn("Download unsuccessful, host plugin not available")
 
         if not os.path.isfile(self.get_agent_pkg_path()):
             msg = u"Unable to download Agent {0} from any URI".format(self.name)
@@ -730,9 +734,9 @@ class GuestAgent(object):
                 logger.info(u"Agent {0} downloaded from {1}", self.name, uri)
         except restutil.HttpError as http_error:
             logger.verbose(u"Agent {0} download from {1} failed [{2}]",
-                        self.name,
-                        uri,
-                        http_error)
+                           self.name,
+                           uri,
+                           http_error)
         return package is not None
 
     def _load_error(self):