Add image logging

Log stdout/stderr from the image build process.  Use the provider
and image name in the log selector so that admins can route
appropriately (or at least grep).

Change-Id: I7bc74ebfca3184340b51b083695b3441f0924e83

nodepool/nodepool.py

@@ -401,7 +401,10 @@ class ImageUpdater(threading.Thread):
                                (server_id, self.snap_image.id))
 
     def bootstrapServer(self, server, key):
-        ssh_kwargs = {}
+        log = logging.getLogger("nodepool.image.build.%s.%s" %
+                                (self.provider.name, self.image.name))
+
+        ssh_kwargs = dict(log=log)
         if key:
             ssh_kwargs['pkey'] = key
         else:
@@ -429,11 +432,9 @@ class ImageUpdater(threading.Thread):
             for k, v in os.environ.items():
                 if k.startswith('NODEPOOL_'):
                     env_vars += ' %s="%s"' % (k, v)
-            r = host.ssh("run setup script",
+            host.ssh("run setup script",
                      "cd /opt/nodepool-scripts && %s ./%s" %
                      (env_vars, self.image.setup))
-            if not r:
-                raise Exception("Unable to run setup scripts")
 
 
 class ConfigValue(object):

nodepool/nodeutils.py

@@ -50,7 +50,7 @@ def ssh_connect(ip, username, connect_kwargs={}, timeout=60):
             if e[0] not in [errno.ECONNREFUSED, errno.EHOSTUNREACH]:
                 log.exception('Exception while testing ssh access:')
 
-    out = client.ssh("test ssh access", "echo access okay")
+    out = client.ssh("test ssh access", "echo access okay", output=True)
     if "access okay" in out:
         return client
     return None

nodepool/sshclient.py

@@ -19,34 +19,40 @@
 # limitations under the License.
 
 import paramiko
-import sys
 
 
 class SSHClient(object):
     def __init__(self, ip, username, password=None, pkey=None,
-                 key_filename=None):
+                 key_filename=None, log=None):
         client = paramiko.SSHClient()
         client.load_system_host_keys()
         client.set_missing_host_key_policy(paramiko.WarningPolicy())
         client.connect(ip, username=username, password=password, pkey=pkey,
                        key_filename=key_filename)
         self.client = client
+        self.log = log
 
-    def ssh(self, action, command):
+    def ssh(self, action, command, output=False):
+        if self.log:
+            self.log.info(command)
         stdin, stdout, stderr = self.client.exec_command(command)
-        print command
-        output = ''
-        for x in stdout:
-            output += x
-            sys.stdout.write(x)
+        out = ''
+        for line in stdout:
+            if output:
+                out += line
+            if self.log:
+                self.log.info(line.rstrip())
+        for line in stderr:
+            if self.log:
+                self.log.error(line.rstrip())
         ret = stdout.channel.recv_exit_status()
-        print stderr.read()
         if ret:
             raise Exception("Unable to %s" % action)
-        return output
+        return out
 
     def scp(self, source, dest):
-        print 'copy', source, dest
+        if self.log:
+            self.log.info("Copy %s -> %s" % (source, dest))
         ftp = self.client.open_sftp()
         ftp.put(source, dest)
         ftp.close()