Massive pylint + pep8 fixups!

38 files changed, 159 insertions, 161 deletions

diff --git a/bin/cloud-init b/bin/cloud-init
index 032d5f39..c1788ef4 100755
--- a/bin/cloud-init
+++ b/bin/cloud-init
@@ -75,6 +75,7 @@ def welcome(action):
     sys.stderr.flush()
     LOG.info(welcome_msg)
 
+
 def extract_fns(args):
     # Files are already opened so lets just pass that along
     # since it would of broke if it couldn't have
@@ -329,11 +330,11 @@ def main_single(name, args):
 
 def main():
     parser = argparse.ArgumentParser()
-    
+
     # Top level args
-    parser.add_argument('--version', '-v', action='version', 
+    parser.add_argument('--version', '-v', action='version',
                         version='%(prog)s ' + (version.version_string()))
-    parser.add_argument('--file', '-f', action='append', 
+    parser.add_argument('--file', '-f', action='append',
                         dest='files',
                         help=('additional yaml configuration'
                               ' files to use'),
@@ -345,18 +346,18 @@ def main():
     subparsers = parser.add_subparsers()
 
     # Each action and its sub-options (if any)
-    parser_init = subparsers.add_parser('init', 
+    parser_init = subparsers.add_parser('init',
                                         help=('initializes cloud-init and'
                                               ' performs initial modules'))
     parser_init.add_argument("--local", '-l', action='store_true',
                              help="start in local mode (default: %(default)s)",
                              default=False)
-    # This is used so that we can know which action is selected + 
+    # This is used so that we can know which action is selected +
     # the functor to use to run this subcommand
     parser_init.set_defaults(action=('init', main_init))
 
     # These settings are used for the 'config' and 'final' stages
-    parser_mod = subparsers.add_parser('modules', 
+    parser_mod = subparsers.add_parser('modules',
                                       help=('activates modules '
                                             'using a given configuration key'))
     parser_mod.add_argument("--mode", '-m', action='store',
@@ -368,7 +369,7 @@ def main():
 
     # These settings are used when you want to query information
     # stored in the cloud-init data objects/directories/files
-    parser_query = subparsers.add_parser('query', 
+    parser_query = subparsers.add_parser('query',
                                          help=('query information stored '
                                                'in cloud-init'))
     parser_query.add_argument("--name", '-n', action="store",
@@ -378,7 +379,7 @@ def main():
     parser_query.set_defaults(action=('query', main_query))
 
     # This subcommand allows you to run a single module
-    parser_single = subparsers.add_parser('single', 
+    parser_single = subparsers.add_parser('single',
                                          help=('run a single module '))
     parser_single.set_defaults(action=('single', main_single))
     parser_single.add_argument("--name", '-n', action="store",
@@ -394,10 +395,10 @@ def main():
                                     ' pass to this module'))
     parser_single.set_defaults(action=('single', main_single))
 
-
     args = parser.parse_args()
 
     # Setup basic logging to start (until reinitialized)
+    # iff in debug mode...
     if args.debug:
         logging.setupBasicLogging()
 
@@ -407,4 +408,3 @@ def main():
 
 if __name__ == '__main__':
     sys.exit(main())
-
diff --git a/cloudinit/cloud.py b/cloudinit/cloud.py
index 90679202..6cdcb76a 100644
--- a/cloudinit/cloud.py
+++ b/cloudinit/cloud.py
@@ -38,6 +38,7 @@ LOG = logging.getLogger(__name__)
 # as providing a backwards compatible object that can be maintained
 # while the stages/other objects can be worked on independently...
 
+
 class Cloud(object):
     def __init__(self, datasource, paths, cfg, distro, runners):
         self.datasource = datasource
@@ -71,7 +72,7 @@ class Cloud(object):
     # The rest of thes are just useful proxies
     def get_userdata(self):
         return self.datasource.get_userdata()
-    
+
     def get_instance_id(self):
         return self.datasource.get_instance_id()
 
diff --git a/cloudinit/config/__init__.py b/cloudinit/config/__init__.py
index 74e2f275..02e32462 100644
--- a/cloudinit/config/__init__.py
+++ b/cloudinit/config/__init__.py
@@ -25,7 +25,7 @@ from cloudinit import log as logging
 
 LOG = logging.getLogger(__name__)
 
-# This prefix is used to make it less 
+# This prefix is used to make it less
 # of a change that when importing
 # we will not find something else with the same
 # name in the lookup path...
diff --git a/cloudinit/config/cc_chef.py b/cloudinit/config/cc_chef.py
index 4e8ef346..74af2a7e 100644
--- a/cloudinit/config/cc_chef.py
+++ b/cloudinit/config/cc_chef.py
@@ -24,7 +24,7 @@ import os
 from cloudinit import templater
 from cloudinit import util
 
-ruby_version_default = "1.8"
+RUBY_VERSION_DEFAULT = "1.8"
 
 
 def handle(name, cfg, cloud, log, _args):
@@ -38,11 +38,11 @@ def handle(name, cfg, cloud, log, _args):
 
     # Ensure the chef directories we use exist
     c_dirs = [
-        '/etc/chef', 
-        '/var/log/chef', 
-        '/var/lib/chef', 
-        '/var/cache/chef', 
-        '/var/backups/chef', 
+        '/etc/chef',
+        '/var/log/chef',
+        '/var/lib/chef',
+        '/var/cache/chef',
+        '/var/backups/chef',
         '/var/run/chef',
     ]
     for d in c_dirs:
@@ -92,7 +92,7 @@ def handle(name, cfg, cloud, log, _args):
             # this will install and run the chef-client from gems
             chef_version = util.get_cfg_option_str(chef_cfg, 'version', None)
             ruby_version = util.get_cfg_option_str(chef_cfg, 'ruby_version',
-                                                   ruby_version_default)
+                                                   RUBY_VERSION_DEFAULT)
             install_chef_from_gems(cloud.distro, ruby_version, chef_version)
             # and finally, run chef-client
             log.debug('Running chef-client')
diff --git a/cloudinit/config/cc_disable_ec2_metadata.py b/cloudinit/config/cc_disable_ec2_metadata.py
index c7d26029..62cca7cc 100644
--- a/cloudinit/config/cc_disable_ec2_metadata.py
+++ b/cloudinit/config/cc_disable_ec2_metadata.py
@@ -24,13 +24,13 @@ from cloudinit.settings import PER_ALWAYS
 
 frequency = PER_ALWAYS
 
-reject_cmd = ['route', 'add', '-host', '169.254.169.254', 'reject']
+REJECT_CMD = ['route', 'add', '-host', '169.254.169.254', 'reject']
 
 
 def handle(name, cfg, _cloud, log, _args):
     disabled = util.get_cfg_option_bool(cfg, "disable_ec2_metadata", False)
     if disabled:
-        util.subp(reject_cmd)
+        util.subp(REJECT_CMD)
     else:
         log.debug(("Skipping transform named %s,"
                    " disabling the ec2 route not enabled"), name)
diff --git a/cloudinit/config/cc_final_message.py b/cloudinit/config/cc_final_message.py
index c257b6d0..fd59aa1e 100644
--- a/cloudinit/config/cc_final_message.py
+++ b/cloudinit/config/cc_final_message.py
@@ -28,7 +28,7 @@ from cloudinit.settings import PER_ALWAYS
 
 frequency = PER_ALWAYS
 
-final_message_def = ("Cloud-init v. {{version}} finished at {{timestamp}}."
+FINAL_MESSAGE_DEF = ("Cloud-init v. {{version}} finished at {{timestamp}}."
                      " Up {{uptime}} seconds.")
 
 
@@ -39,21 +39,21 @@ def handle(_name, cfg, cloud, log, args):
         msg_in = args[0]
     else:
         msg_in = util.get_cfg_option_str(cfg, "final_message")
-    
+
     if not msg_in:
         template_fn = cloud.get_template_filename('final_message')
         if template_fn:
             msg_in = util.load_file(template_fn)
 
     if not msg_in:
-        msg_in = final_message_def
+        msg_in = FINAL_MESSAGE_DEF
 
     uptime = util.uptime()
     ts = util.time_rfc2822()
     cver = version.version_string()
     try:
         subs = {
-            'uptime': uptime, 
+            'uptime': uptime,
             'timestamp': ts,
             'version': cver,
         }
diff --git a/cloudinit/config/cc_foo.py b/cloudinit/config/cc_foo.py
index 99135704..e81e7faa 100644
--- a/cloudinit/config/cc_foo.py
+++ b/cloudinit/config/cc_foo.py
@@ -30,19 +30,19 @@ from cloudinit.settings import PER_INSTANCE
 #    as well as any datasource provided configuration
 #    c) A cloud object that can be used to access various
 #    datasource and paths for the given distro and data provided
-#    by the various datasource instance types. 
+#    by the various datasource instance types.
 #    d) A argument list that may or may not be empty to this module.
 #    Typically those are from module configuration where the module
 #    is defined with some extra configuration that will eventually
 #    be translated from yaml into arguments to this module.
 # 2. A optional 'frequency' that defines how often this module should be ran.
-#    Typically one of PER_INSTANCE, PER_ALWAYS, PER_ONCE. If not 
-#    provided PER_INSTANCE will be assumed. 
+#    Typically one of PER_INSTANCE, PER_ALWAYS, PER_ONCE. If not
+#    provided PER_INSTANCE will be assumed.
 #    See settings.py for these constants.
 # 3. A optional 'distros' array/set/tuple that defines the known distros
 #    this module will work with (if not all of them). This is used to write
 #    a warning out if a module is being ran on a untested distribution for
-#    informational purposes. If non existent all distros are assumed and 
+#    informational purposes. If non existent all distros are assumed and
 #    no warning occurs.
 
 frequency = PER_INSTANCE
diff --git a/cloudinit/config/cc_keys_to_console.py b/cloudinit/config/cc_keys_to_console.py
index 40758198..a8fb3ba7 100644
--- a/cloudinit/config/cc_keys_to_console.py
+++ b/cloudinit/config/cc_keys_to_console.py
@@ -26,13 +26,13 @@ from cloudinit import util
 frequency = PER_INSTANCE
 
 # This is a tool that cloud init provides
-helper_tool = '/usr/lib/cloud-init/write-ssh-key-fingerprints'
+HELPER_TOOL = '/usr/lib/cloud-init/write-ssh-key-fingerprints'
 
 
 def handle(name, cfg, cloud, log, _args):
-    if not os.path.exists(helper_tool):
+    if not os.path.exists(HELPER_TOOL):
         log.warn(("Unable to activate transform %s,"
-                  " helper tool not found at %s"), name, helper_tool)
+                  " helper tool not found at %s"), name, HELPER_TOOL)
         return
 
     fp_blacklist = util.get_cfg_option_list(cfg,
@@ -42,7 +42,7 @@ def handle(name, cfg, cloud, log, _args):
                                               ["ssh-dss"])
 
     try:
-        cmd = [helper_tool]
+        cmd = [HELPER_TOOL]
         cmd.append(','.join(fp_blacklist))
         cmd.append(','.join(key_blacklist))
         (stdout, _stderr) = util.subp(cmd)
diff --git a/cloudinit/config/cc_landscape.py b/cloudinit/config/cc_landscape.py
index 29ce41b9..599276a7 100644
--- a/cloudinit/config/cc_landscape.py
+++ b/cloudinit/config/cc_landscape.py
@@ -62,7 +62,7 @@ def handle(name, cfg, cloud, log, _args):
     ls_cloudcfg = cfg.get("landscape", {})
 
     if not isinstance(ls_cloudcfg, dict):
-        raise Exception(("'landscape' key existed in config," 
+        raise Exception(("'landscape' key existed in config,"
                          " but not a dictionary type,"
                          " is a %s instead"), util.obj_name(ls_cloudcfg))
 
diff --git a/cloudinit/config/cc_mcollective.py b/cloudinit/config/cc_mcollective.py
index 4cec6494..ba5e13ca 100644
--- a/cloudinit/config/cc_mcollective.py
+++ b/cloudinit/config/cc_mcollective.py
@@ -52,7 +52,7 @@ def handle(name, cfg, cloud, log, _args):
         # It doesn't contain any sections so just add one temporarily
         # Use a hash id based off the contents,
         # just incase of conflicts... (try to not have any...)
-        # This is so that an error won't occur when reading (and no 
+        # This is so that an error won't occur when reading (and no
         # sections exist in the file)
         section_tpl = "[nullsection_%s]"
         attempts = 0
@@ -85,7 +85,7 @@ def handle(name, cfg, cloud, log, _args):
         # the previous server.cfg and create our new one
         old_fn = "%s.old" % (server_cfg_fn)
         util.rename(server_cfg_fn, old_fn)
-        # Now we got the whole file, write to disk except the section 
+        # Now we got the whole file, write to disk except the section
         # we added so that config parser won't error out when trying to read.
         # Note below, that we've just used ConfigParser because it generally
         # works.  Below, we remove the initial 'nullsection' header.
diff --git a/cloudinit/config/cc_mounts.py b/cloudinit/config/cc_mounts.py
index 700fbc44..ab097c2a 100644
--- a/cloudinit/config/cc_mounts.py
+++ b/cloudinit/config/cc_mounts.py
@@ -24,10 +24,10 @@ import re
 
 from cloudinit import util
 
-# shortname matches 'sda', 'sda1', 'xvda', 'hda', 'sdb', xvdb, vda, vdd1
-shortname_filter = r"^[x]{0,1}[shv]d[a-z][0-9]*$"
-shortname = re.compile(shortname_filter)
-ws = re.compile("[%s]+" % (whitespace))
+# Shortname matches 'sda', 'sda1', 'xvda', 'hda', 'sdb', xvdb, vda, vdd1
+SHORTNAME_FILTER = r"^[x]{0,1}[shv]d[a-z][0-9]*$"
+SHORTNAME = re.compile(SHORTNAME_FILTER)
+WS = re.compile("[%s]+" % (whitespace))
 
 
 def is_mdname(name):
@@ -55,7 +55,6 @@ def handle(_name, cfg, cloud, log, _args):
     if "mounts" in cfg:
         cfgmnt = cfg["mounts"]
 
-    
     for i in range(len(cfgmnt)):
         # skip something that wasn't a list
         if not isinstance(cfgmnt[i], list):
@@ -85,7 +84,7 @@ def handle(_name, cfg, cloud, log, _args):
                 cfgmnt[i][0] = renamed
                 log.debug("Mapped metadata name %s to %s", startname, renamed)
         else:
-            if shortname.match(startname):
+            if SHORTNAME.match(startname):
                 renamed = "/dev/%s" % startname
                 log.debug("Mapped shortname name %s to %s", startname, renamed)
                 cfgmnt[i][0] = renamed
@@ -171,7 +170,7 @@ def handle(_name, cfg, cloud, log, _args):
     fstab = util.load_file(cloud.paths.join(True, "/etc/fstab"))
     for line in fstab.splitlines():
         try:
-            toks = ws.split(line)
+            toks = WS.split(line)
             if toks[3].find(comment) != -1:
                 continue
         except:
diff --git a/cloudinit/config/cc_phone_home.py b/cloudinit/config/cc_phone_home.py
index a8752527..dcb07b66 100644
--- a/cloudinit/config/cc_phone_home.py
+++ b/cloudinit/config/cc_phone_home.py
@@ -26,8 +26,13 @@ from cloudinit.settings import PER_INSTANCE
 
 frequency = PER_INSTANCE
 
-post_list_all = ['pub_key_dsa', 'pub_key_rsa', 'pub_key_ecdsa',
-                 'instance_id', 'hostname']
+POST_LIST_ALL = [
+    'pub_key_dsa',
+    'pub_key_rsa',
+    'pub_key_ecdsa',
+    'instance_id',
+    'hostname'
+]
 
 
 # phone_home:
@@ -63,7 +68,7 @@ def handle(name, cfg, cloud, log, args):
                           " is not an integer, using %s instead"), tries)
 
     if post_list == "all":
-        post_list = post_list_all
+        post_list = POST_LIST_ALL
 
     all_keys = {}
     all_keys['instance_id'] = cloud.get_instance_id()
diff --git a/cloudinit/config/cc_puppet.py b/cloudinit/config/cc_puppet.py
index 5fb88bf2..5154efba 100644
--- a/cloudinit/config/cc_puppet.py
+++ b/cloudinit/config/cc_puppet.py
@@ -63,7 +63,7 @@ def handle(name, cfg, cloud, log, _args):
                 util.ensure_dir(pp_ssl_dir, 0771)
                 util.chownbyid(pp_ssl_dir,
                                pwd.getpwnam('puppet').pw_uid, 0)
-                pp_ssl_certs = cloud.paths.join(False, 
+                pp_ssl_certs = cloud.paths.join(False,
                                                 '/var/lib/puppet/ssl/certs/')
                 util.ensure_dir(pp_ssl_certs)
                 util.chownbyid(pp_ssl_certs,
diff --git a/cloudinit/config/cc_resizefs.py b/cloudinit/config/cc_resizefs.py
index 1690094a..c019989e 100644
--- a/cloudinit/config/cc_resizefs.py
+++ b/cloudinit/config/cc_resizefs.py
@@ -27,7 +27,7 @@ from cloudinit.settings import PER_ALWAYS
 
 frequency = PER_ALWAYS
 
-resize_fs_prefixes_cmds = [
+RESIZE_FS_PREFIXES_CMDS = [
     ('ext', 'resize2fs'),
     ('xfs', 'xfs_growfs'),
 ]
@@ -89,16 +89,16 @@ def handle(name, cfg, cloud, log, args):
         # occurs this temporary file will still benefit from
         # auto deletion
         tfh.unlink_now()
-    
+
         st_dev = nodeify_path(devpth, resize_what, log)
         fs_type = get_fs_type(st_dev, devpth, log)
         if not fs_type:
             log.warn("Could not determine filesystem type of %s", resize_what)
             return
-    
+
         resizer = None
         fstype_lc = fs_type.lower()
-        for (pfix, root_cmd) in resize_fs_prefixes_cmds:
+        for (pfix, root_cmd) in RESIZE_FS_PREFIXES_CMDS:
             if fstype_lc.startswith(pfix):
                 resizer = root_cmd
                 break
@@ -112,7 +112,7 @@ def handle(name, cfg, cloud, log, args):
         resize_cmd = [resizer, devpth]
 
         if resize_root == "noblock":
-            # Fork to a child that will run 
+            # Fork to a child that will run
             # the resize command
             util.fork_cb(do_resize, resize_cmd, log)
             # Don't delete the file now in the parent
diff --git a/cloudinit/config/cc_salt_minion.py b/cloudinit/config/cc_salt_minion.py
index 16f5286d..986e6db6 100644
--- a/cloudinit/config/cc_salt_minion.py
+++ b/cloudinit/config/cc_salt_minion.py
@@ -32,7 +32,7 @@ def handle(name, cfg, cloud, log, _args):
 
     # Start by installing the salt package ...
     cloud.distro.install_packages(["salt"])
-    
+
     # Ensure we can configure files at the right dir
     config_dir = salt_cfg.get("config_dir", '/etc/salt')
     config_dir = cloud.paths.join(False, config_dir)
diff --git a/cloudinit/config/cc_scripts_per_boot.py b/cloudinit/config/cc_scripts_per_boot.py
index 364e1d02..d3c47442 100644
--- a/cloudinit/config/cc_scripts_per_boot.py
+++ b/cloudinit/config/cc_scripts_per_boot.py
@@ -26,16 +26,16 @@ from cloudinit.settings import PER_ALWAYS
 
 frequency = PER_ALWAYS
 
-script_subdir = 'per-boot'
+SCRIPT_SUBDIR = 'per-boot'
 
 
 def handle(name, _cfg, cloud, log, _args):
     # Comes from the following:
     # https://forums.aws.amazon.com/thread.jspa?threadID=96918
-    runparts_path = os.path.join(cloud.get_cpath(), 'scripts', script_subdir)
+    runparts_path = os.path.join(cloud.get_cpath(), 'scripts', SCRIPT_SUBDIR)
     try:
         util.runparts(runparts_path)
     except:
         log.warn("Failed to run transform %s (%s in %s)",
-                 name, script_subdir, runparts_path)
+                 name, SCRIPT_SUBDIR, runparts_path)
         raise
diff --git a/cloudinit/config/cc_scripts_per_instance.py b/cloudinit/config/cc_scripts_per_instance.py
index d75ab47d..8e428ac2 100644
--- a/cloudinit/config/cc_scripts_per_instance.py
+++ b/cloudinit/config/cc_scripts_per_instance.py
@@ -26,16 +26,16 @@ from cloudinit.settings import PER_INSTANCE
 
 frequency = PER_INSTANCE
 
-script_subdir = 'per-instance'
+SCRIPT_SUBDIR = 'per-instance'
 
 
 def handle(name, _cfg, cloud, log, _args):
     # Comes from the following:
     # https://forums.aws.amazon.com/thread.jspa?threadID=96918
-    runparts_path = os.path.join(cloud.get_cpath(), 'scripts', script_subdir)
+    runparts_path = os.path.join(cloud.get_cpath(), 'scripts', SCRIPT_SUBDIR)
     try:
         util.runparts(runparts_path)
     except:
         log.warn("Failed to run transform %s (%s in %s)",
-                 name, script_subdir, runparts_path)
+                 name, SCRIPT_SUBDIR, runparts_path)
         raise
diff --git a/cloudinit/config/cc_scripts_per_once.py b/cloudinit/config/cc_scripts_per_once.py
index 80f8c325..e7a29a44 100644
--- a/cloudinit/config/cc_scripts_per_once.py
+++ b/cloudinit/config/cc_scripts_per_once.py
@@ -26,16 +26,16 @@ from cloudinit.settings import PER_ONCE
 
 frequency = PER_ONCE
 
-script_subdir = 'per-once'
+SCRIPT_SUBDIR = 'per-once'
 
 
 def handle(name, _cfg, cloud, log, _args):
     # Comes from the following:
     # https://forums.aws.amazon.com/thread.jspa?threadID=96918
-    runparts_path = os.path.join(cloud.get_cpath(), 'scripts', script_subdir)
+    runparts_path = os.path.join(cloud.get_cpath(), 'scripts', SCRIPT_SUBDIR)
     try:
         util.runparts(runparts_path)
     except:
         log.warn("Failed to run transform %s (%s in %s)",
-                 name, script_subdir, runparts_path)
+                 name, SCRIPT_SUBDIR, runparts_path)
         raise
diff --git a/cloudinit/config/cc_scripts_user.py b/cloudinit/config/cc_scripts_user.py
index f4fe3a2a..1ff05aae 100644
--- a/cloudinit/config/cc_scripts_user.py
+++ b/cloudinit/config/cc_scripts_user.py
@@ -26,17 +26,17 @@ from cloudinit.settings import PER_INSTANCE
 
 frequency = PER_INSTANCE
 
-script_subdir = 'scripts'
+SCRIPT_SUBDIR = 'scripts'
 
 
 def handle(name, _cfg, cloud, log, _args):
     # This is written to by the user data handlers
     # Ie, any custom shell scripts that come down
     # go here...
-    runparts_path = os.path.join(cloud.get_ipath_cur(), script_subdir)
+    runparts_path = os.path.join(cloud.get_ipath_cur(), SCRIPT_SUBDIR)
     try:
         util.runparts(runparts_path)
     except:
         log.warn("Failed to run transform %s (%s in %s)",
-                 name, script_subdir, runparts_path)
+                 name, SCRIPT_SUBDIR, runparts_path)
         raise
diff --git a/cloudinit/config/cc_set_passwords.py b/cloudinit/config/cc_set_passwords.py
index e7049f22..ce17f357 100644
--- a/cloudinit/config/cc_set_passwords.py
+++ b/cloudinit/config/cc_set_passwords.py
@@ -25,7 +25,7 @@ from cloudinit import util
 from string import letters, digits  # pylint: disable=W0402
 
 # We are removing certain 'painful' letters/numbers
-pw_set = (letters.translate(None, 'loLOI') +
+PW_SET = (letters.translate(None, 'loLOI') +
           digits.translate(None, '01'))
 
 
@@ -148,4 +148,4 @@ def handle(_name, cfg, cloud, log, args):
 
 
 def rand_user_password(pwlen=9):
-    return util.rand_str(pwlen, select_from=pw_set)
+    return util.rand_str(pwlen, select_from=PW_SET)
diff --git a/cloudinit/config/cc_ssh.py b/cloudinit/config/cc_ssh.py
index e5e99560..4019ae90 100644
--- a/cloudinit/config/cc_ssh.py
+++ b/cloudinit/config/cc_ssh.py
@@ -24,11 +24,11 @@ import glob
 from cloudinit import util
 from cloudinit import ssh_util
 
-DISABLE_ROOT_OPTS = ( "no-port-forwarding,no-agent-forwarding," 
-"no-X11-forwarding,command=\"echo \'Please login as the user \\\"$USER\\\" " 
+DISABLE_ROOT_OPTS = ("no-port-forwarding,no-agent-forwarding,"
+"no-X11-forwarding,command=\"echo \'Please login as the user \\\"$USER\\\" "
 "rather than the user \\\"root\\\".\';echo;sleep 10\"")
 
-key2file = {
+KEY_2_FILE = {
     "rsa_private": ("/etc/ssh/ssh_host_rsa_key", 0600),
     "rsa_public": ("/etc/ssh/ssh_host_rsa_key.pub", 0644),
     "dsa_private": ("/etc/ssh/ssh_host_dsa_key", 0600),
@@ -37,15 +37,17 @@ key2file = {
     "ecdsa_public": ("/etc/ssh/ssh_host_ecdsa_key.pub", 0644),
 }
 
-priv2pub = {
-    'rsa_private': 'rsa_public', 
+PRIV_2_PUB = {
+    'rsa_private': 'rsa_public',
     'dsa_private': 'dsa_public',
     'ecdsa_private': 'ecdsa_public',
 }
 
-key_gen_tpl = 'o=$(ssh-keygen -yf "%s") && echo "$o" root@localhost > "%s"'
+KEY_GEN_TPL = 'o=$(ssh-keygen -yf "%s") && echo "$o" root@localhost > "%s"'
 
-generate_keys = ['rsa', 'dsa', 'ecdsa']
+GENERATE_KEY_NAMES = ['rsa', 'dsa', 'ecdsa']
+
+KEY_FILE_TPL = '/etc/ssh/ssh_host_%s_key'
 
 
 def handle(_name, cfg, cloud, log, _args):
@@ -58,21 +60,21 @@ def handle(_name, cfg, cloud, log, _args):
                 util.del_file(f)
             except:
                 util.logexc(log, "Failed deleting key file %s", f)
-    
+
     if "ssh_keys" in cfg:
         # if there are keys in cloud-config, use them
         for (key, val) in cfg["ssh_keys"].iteritems():
-            if key in key2file:
-                tgt_fn = key2file[key][0]
-                tgt_perms = key2file[key][1]
+            if key in KEY_2_FILE:
+                tgt_fn = KEY_2_FILE[key][0]
+                tgt_perms = KEY_2_FILE[key][1]
                 util.write_file(cloud.paths.join(False, tgt_fn),
                                 val, tgt_perms)
 
-        for (priv, pub) in priv2pub.iteritems():
+        for (priv, pub) in PRIV_2_PUB.iteritems():
             if pub in cfg['ssh_keys'] or not priv in cfg['ssh_keys']:
                 continue
-            pair = (key2file[priv][0], key2file[pub][0])
-            cmd = ['sh', '-xc', key_gen_tpl % pair]
+            pair = (KEY_2_FILE[priv][0], KEY_2_FILE[pub][0])
+            cmd = ['sh', '-xc', KEY_GEN_TPL % pair]
             try:
                 # TODO: Is this guard needed?
                 with util.SeLinuxGuard("/etc/ssh", recursive=True):
@@ -84,12 +86,11 @@ def handle(_name, cfg, cloud, log, _args):
     else:
         # if not, generate them
         genkeys = util.get_cfg_option_list(cfg,
-                                            'ssh_genkeytypes', 
-                                            generate_keys)
+                                           'ssh_genkeytypes',
+                                           GENERATE_KEY_NAMES)
         for keytype in genkeys:
-            keyfile = '/etc/ssh/ssh_host_%s_key' % (keytype)
-            keyfile = cloud.paths.join(False, keyfile)
-            util.ensure_dir(os.path.dirname(keyfile)) 
+            keyfile = cloud.paths.join(False, KEY_FILE_TPL % (keytype))
+            util.ensure_dir(os.path.dirname(keyfile))
             if not os.path.exists(keyfile):
                 cmd = ['ssh-keygen', '-t', keytype, '-N', '', '-f', keyfile]
                 try:
diff --git a/cloudinit/distros/__init__.py b/cloudinit/distros/__init__.py
index 45dd85ec..25a60c52 100644
--- a/cloudinit/distros/__init__.py
+++ b/cloudinit/distros/__init__.py
@@ -157,4 +157,3 @@ def fetch(distro_name, mods=(__name__, )):
                            % (distro_name))
     distro_cls = getattr(mod, 'Distro')
     return distro_cls
-    
diff --git a/cloudinit/distros/rhel.py b/cloudinit/distros/rhel.py
index b67ae5b8..5cbefa6e 100644
--- a/cloudinit/distros/rhel.py
+++ b/cloudinit/distros/rhel.py
@@ -35,7 +35,7 @@ class Distro(distros.Distro):
 
     def __init__(self, name, cfg, paths):
         distros.Distro.__init__(self, name, cfg, paths)
-    
+
     def install_packages(self, pkglist):
         self.package_command('install', pkglist)
 
@@ -210,12 +210,12 @@ class Distro(distros.Distro):
     def package_command(self, command, args=None):
         cmd = ['yum']
         # If enabled, then yum will be tolerant of errors on the command line
-        # with regard to packages. 
-        # For example: if you request to install foo, bar and baz and baz is 
+        # with regard to packages.
+        # For example: if you request to install foo, bar and baz and baz is
         # installed; yum won't error out complaining that baz is already
-        # installed. 
+        # installed.
         cmd.append("-t")
-        # Determines whether or not yum prompts for confirmation 
+        # Determines whether or not yum prompts for confirmation
         # of critical actions. We don't want to prompt...
         cmd.append("-y")
         cmd.append(command)
@@ -223,8 +223,8 @@ class Distro(distros.Distro):
             cmd.extend(args)
         # Allow the output of this to flow outwards (ie not be captured)
         util.subp(cmd, capture=False)
-        
-        
+
+
 # This is a util function to translate a ubuntu /etc/network/interfaces 'blob'
 # to a rhel equiv. that can then be written to /etc/sysconfig/network-scripts/
 # TODO remove when we have python-netcf active...
diff --git a/cloudinit/distros/ubuntu.py b/cloudinit/distros/ubuntu.py
index 5a1b572e..fd7b7b8d 100644
--- a/cloudinit/distros/ubuntu.py
+++ b/cloudinit/distros/ubuntu.py
@@ -36,11 +36,11 @@ class Distro(distros.Distro):
 
     def __init__(self, name, cfg, paths):
         distros.Distro.__init__(self, name, cfg, paths)
-        # This will be used to restrict certain 
+        # This will be used to restrict certain
         # calls from repeatly happening (when they
         # should only happen say once per instance...)
         self._runner = helpers.Runners(paths)
-    
+
     def install_packages(self, pkglist):
         self._update_package_sources()
         self.package_command('install', pkglist)
@@ -131,4 +131,4 @@ class Distro(distros.Distro):
 
     def _update_package_sources(self):
         self._runner.run("update-sources", self.package_command,
-                         ["update"], freq=PER_INSTANCE)
\ No newline at end of file
+                         ["update"], freq=PER_INSTANCE)
diff --git a/cloudinit/handlers/__init__.py b/cloudinit/handlers/__init__.py
index c6f2119c..d52b1cba 100644
--- a/cloudinit/handlers/__init__.py
+++ b/cloudinit/handlers/__init__.py
@@ -104,7 +104,7 @@ def run_part(mod, data, ctype, filename, payload, frequency):
     except:
         mod_ver = 1
     try:
-        LOG.debug("Calling handler %s (%s, %s, %s) with frequency %s", 
+        LOG.debug("Calling handler %s (%s, %s, %s) with frequency %s",
                   mod, ctype, filename, mod_ver, frequency)
         if mod_ver >= 2:
             # Treat as v. 2 which does get a frequency
@@ -114,7 +114,7 @@ def run_part(mod, data, ctype, filename, payload, frequency):
             mod.handle_part(data, ctype, filename, payload)
     except:
         util.logexc(LOG, ("Failed calling handler %s (%s, %s, %s)"
-                         " with frequency %s"), 
+                         " with frequency %s"),
                     mod, ctype, filename,
                     mod_ver, frequency)
 
@@ -178,7 +178,7 @@ def walker_callback(pdata, ctype, filename, payload):
                  payload, pdata['frequency'])
 
 
-# Callback is a function that will be called with 
+# Callback is a function that will be called with
 # (data, content_type, filename, payload)
 def walk(msg, callback, data):
     partnum = 0
@@ -226,5 +226,3 @@ def type_from_starts_with(payload, default=None):
         if payload_lc.startswith(text):
             return INCLUSION_TYPES_MAP[text]
     return default
-
-
diff --git a/cloudinit/helpers.py b/cloudinit/helpers.py
index 45633e0f..4447d1ee 100644
--- a/cloudinit/helpers.py
+++ b/cloudinit/helpers.py
@@ -84,7 +84,7 @@ class FileSemaphores(object):
         try:
             util.del_dir(self.sem_path)
         except (IOError, OSError):
-            util.logexc(LOG, "Failed deleting semaphore directory %s", 
+            util.logexc(LOG, "Failed deleting semaphore directory %s",
                         self.sem_path)
 
     def _acquire(self, name, freq):
@@ -212,7 +212,7 @@ class Paths(object):
         self.cfgs = path_cfgs
         # Populate all the initial paths
         self.cloud_dir = self.join(False,
-                                   path_cfgs.get('cloud_dir', 
+                                   path_cfgs.get('cloud_dir',
                                                  '/var/lib/cloud'))
         self.instance_link = os.path.join(self.cloud_dir, 'instance')
         self.boot_finished = os.path.join(self.instance_link, "boot-finished")
@@ -237,7 +237,7 @@ class Paths(object):
         # Set when a datasource becomes active
         self.datasource = ds
 
-    # joins the paths but also appends a read 
+    # joins the paths but also appends a read
     # or write root if available
     def join(self, read_only, *paths):
         if read_only:
diff --git a/cloudinit/log.py b/cloudinit/log.py
index 478946f8..fc1428a2 100644
--- a/cloudinit/log.py
+++ b/cloudinit/log.py
@@ -20,7 +20,6 @@
 #    You should have received a copy of the GNU General Public License
 #    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-
 import logging
 import logging.handlers
 import logging.config
@@ -53,7 +52,6 @@ def setupBasicLogging():
     root.setLevel(DEBUG)
 
 
-
 def setupLogging(cfg=None):
     # See if the config provides any logging conf...
     if not cfg:
diff --git a/cloudinit/settings.py b/cloudinit/settings.py
index 8a1eaeb3..fac9b862 100644
--- a/cloudinit/settings.py
+++ b/cloudinit/settings.py
@@ -47,7 +47,7 @@ CFG_BUILTIN = {
         'paths': {
             'cloud_dir': '/var/lib/cloud',
             'templates_dir': '/etc/cloud/templates/',
-        }, 
+        },
         'distro': 'ubuntu',
     },
 }
diff --git a/cloudinit/sources/DataSourceCloudStack.py b/cloudinit/sources/DataSourceCloudStack.py
index b1817654..83c577e6 100644
--- a/cloudinit/sources/DataSourceCloudStack.py
+++ b/cloudinit/sources/DataSourceCloudStack.py
@@ -121,7 +121,7 @@ class DataSourceCloudStack(sources.DataSource):
                 None, self.metadata_address)
             self.metadata = boto_utils.get_instance_metadata(self.api_ver,
                 self.metadata_address)
-            LOG.debug("Crawl of metadata service took %s seconds", 
+            LOG.debug("Crawl of metadata service took %s seconds",
                       int(time.time() - start_time))
             return True
         except Exception:
diff --git a/cloudinit/sources/DataSourceConfigDrive.py b/cloudinit/sources/DataSourceConfigDrive.py
index 5da1ffea..9905dad4 100644
--- a/cloudinit/sources/DataSourceConfigDrive.py
+++ b/cloudinit/sources/DataSourceConfigDrive.py
@@ -36,7 +36,7 @@ CFG_DRIVE_FILES = [
     "meta.js",
 ]
 DEFAULT_METADATA = {
-    "instance-id": DEFAULT_IID, 
+    "instance-id": DEFAULT_IID,
     "dsmode": DEFAULT_MODE,
 }
 CFG_DRIVE_DEV_ENV = 'CLOUD_INIT_CONFIG_DRIVE_DEVICE'
diff --git a/cloudinit/sources/DataSourceEc2.py b/cloudinit/sources/DataSourceEc2.py
index 55447102..0598dfa2 100644
--- a/cloudinit/sources/DataSourceEc2.py
+++ b/cloudinit/sources/DataSourceEc2.py
@@ -38,7 +38,7 @@ DEF_MD_URL = "http://169.254.169.254"
 DEF_MD_VERSION = '2009-04-04'
 
 # Default metadata urls that will be used if none are provided
-# They will be checked for 'resolveability' and some of the 
+# They will be checked for 'resolveability' and some of the
 # following may be discarded if they do not resolve
 DEF_MD_URLS = [DEF_MD_URL, "http://instance-data:8773"]
 
@@ -69,7 +69,7 @@ class DataSourceEc2(sources.DataSource):
                 None, self.metadata_address)
             self.metadata = boto_utils.get_instance_metadata(self.api_ver,
                 self.metadata_address)
-            LOG.debug("Crawl of metadata service took %s seconds", 
+            LOG.debug("Crawl of metadata service took %s seconds",
                        int(time.time() - start_time))
             return True
         except Exception:
@@ -201,7 +201,7 @@ class DataSourceEc2(sources.DataSource):
             return None
 
         # Example:
-        # 'block-device-mapping': 
+        # 'block-device-mapping':
         # {'ami': '/dev/sda1',
         # 'ephemeral0': '/dev/sdb',
         # 'root': '/dev/sda1'}
diff --git a/cloudinit/sources/DataSourceMAAS.py b/cloudinit/sources/DataSourceMAAS.py
index bb8fbac1..104e7a54 100644
--- a/cloudinit/sources/DataSourceMAAS.py
+++ b/cloudinit/sources/DataSourceMAAS.py
@@ -251,6 +251,7 @@ datasources = [
   (DataSourceMAAS, (sources.DEP_FILESYSTEM, sources.DEP_NETWORK)),
 ]
 
+
 # Return a list of data sources that match this set of dependencies
 def get_datasource_list(depends):
     return sources.list_from_depends(depends, datasources)
diff --git a/cloudinit/sources/DataSourceNoCloud.py b/cloudinit/sources/DataSourceNoCloud.py
index 2b016d1c..8499a97c 100644
--- a/cloudinit/sources/DataSourceNoCloud.py
+++ b/cloudinit/sources/DataSourceNoCloud.py
@@ -154,7 +154,7 @@ class DataSourceNoCloud(sources.DataSource):
             (self.dsmode in ("local", seeded_interfaces))):
             LOG.info("Updating network interfaces from %s", self)
             self.distro.apply_network(md['network-interfaces'])
-            
+
         if md['dsmode'] == self.dsmode:
             self.seed = ",".join(found)
             self.metadata = md
diff --git a/cloudinit/ssh_util.py b/cloudinit/ssh_util.py
index fef3d40f..45dd5535 100644
--- a/cloudinit/ssh_util.py
+++ b/cloudinit/ssh_util.py
@@ -103,10 +103,10 @@ class AuthKeyLineParser(object):
             elif curc == '"':
                 quoted = not quoted
             i = i + 1
-    
+
         options = ent[0:i]
         options_lst = []
-        
+
         # Now use a csv parser to pull the options
         # out of the above string that we just found an endpoint for.
         #
@@ -211,7 +211,6 @@ def update_authorized_keys(fname, keys):
 
 
 def setup_user_keys(keys, user, key_prefix, paths):
-    
     # Make sure the users .ssh dir is setup accordingly
     pwent = pwd.getpwnam(user)
     ssh_dir = os.path.join(pwent.pw_dir, '.ssh')
diff --git a/cloudinit/stages.py b/cloudinit/stages.py
index ae6e2de5..84a965c2 100644
--- a/cloudinit/stages.py
+++ b/cloudinit/stages.py
@@ -287,7 +287,7 @@ class Init(object):
 
     def cloudify(self):
         # Form the needed options to cloudify our members
-        return cloud.Cloud(self.datasource, 
+        return cloud.Cloud(self.datasource,
                            self.paths, self.cfg,
                            self.distro, helpers.Runners(self.paths))
 
@@ -318,7 +318,7 @@ class Init(object):
     def consume(self, frequency=PER_INSTANCE):
         cdir = self.paths.get_cpath("handlers")
         idir = self.paths.get_ipath("handlers")
-    
+
         # Add the path to the plugins dir to the top of our list for import
         # instance dir should be read before cloud-dir
         if cdir and cdir not in sys.path:
@@ -417,7 +417,7 @@ class Modules(object):
             except:
                 util.logexc(LOG, ("Failed loading of datasource"
                                   " config object from %s"), self.datasource)
-        
+
         if self.base_cfg:
             t_cfgs.append(self.base_cfg)
 
diff --git a/cloudinit/url_helper.py b/cloudinit/url_helper.py
index 1c583eba..223278ce 100644
--- a/cloudinit/url_helper.py
+++ b/cloudinit/url_helper.py
@@ -47,11 +47,11 @@ class UrlResponse(object):
     @property
     def contents(self):
         return self._contents
-    
+
     @property
     def headers(self):
         return self._headers
-    
+
     def __str__(self):
         if not self.contents:
             return ''
@@ -66,7 +66,7 @@ class UrlResponse(object):
             return True
         else:
             return False
-    
+
 
 def readurl(url, data=None, timeout=None,
             retries=0, sec_between=1, headers=None):
@@ -89,8 +89,8 @@ def readurl(url, data=None, timeout=None,
 
     excepts = []
     LOG.info(("Attempting to open '%s' with %s attempts"
-                " (%s retries, timeout=%s) to be performed"), 
-             url, attempts, retries, timeout)
+              " (%s retries, timeout=%s) to be performed"),
+              url, attempts, retries, timeout)
     open_args = {}
     if timeout is not None:
         open_args['timeout'] = int(timeout)
@@ -112,7 +112,7 @@ def readurl(url, data=None, timeout=None,
             excepts.append(e)
         except urllib2.URLError as e:
             # This can be a message string or
-            # another exception instance 
+            # another exception instance
             # (socket.error for remote URLs, OSError for local URLs).
             if (isinstance(e.reason, (OSError)) and
                 e.reason.errno == errno.ENOENT):
@@ -128,7 +128,7 @@ def readurl(url, data=None, timeout=None,
 
     # Didn't work out
     LOG.warn("Failed reading from %s after %s attempts", url, attempts)
-    
+
     # It must of errored at least once for code
     # to get here so re-raise the last error
     LOG.debug("%s errors occured, re-raising the last one", len(excepts))
diff --git a/cloudinit/user_data.py b/cloudinit/user_data.py
index b7902d44..4babb8e5 100644
--- a/cloudinit/user_data.py
+++ b/cloudinit/user_data.py
@@ -65,33 +65,33 @@ class UserDataProcessor(object):
             # multipart/* are just containers
             if part.get_content_maintype() == 'multipart':
                 continue
-    
+
             ctype = None
             ctype_orig = part.get_content_type()
             payload = part.get_payload(decode=True)
-    
+
             if not ctype_orig:
                 ctype_orig = UNDEF_TYPE
-    
+
             if ctype_orig in TYPE_NEEDED:
                 ctype = handlers.type_from_starts_with(payload)
-    
+
             if ctype is None:
                 ctype = ctype_orig
-    
+
             if ctype in INCLUDE_TYPES:
                 self._do_include(payload, append_msg)
                 continue
-    
+
             if ctype in ARCHIVE_TYPES:
                 self._explode_archive(payload, append_msg)
                 continue
-    
+
             if 'Content-Type' in base_msg:
                 base_msg.replace_header('Content-Type', ctype)
             else:
                 base_msg['Content-Type'] = ctype
-    
+
             self._attach_part(append_msg, part)
 
     def _get_include_once_filename(self, entry):
@@ -108,8 +108,8 @@ class UserDataProcessor(object):
             lc_line = line.lower()
             if lc_line.startswith("#include-once"):
                 line = line[len("#include-once"):].lstrip()
-                # Every following include will now 
-                # not be refetched.... but will be 
+                # Every following include will now
+                # not be refetched.... but will be
                 # re-read from a local urlcache (if it worked)
                 include_once_on = True
             elif lc_line.startswith("#include"):
@@ -190,10 +190,10 @@ class UserDataProcessor(object):
         """
         if ATTACHMENT_FIELD not in outer_msg:
             outer_msg[ATTACHMENT_FIELD] = '0'
-    
+
         if new_count is not None:
             outer_msg.replace_header(ATTACHMENT_FIELD, str(new_count))
-    
+
         fetched_count = 0
         try:
             fetched_count = int(outer_msg.get(ATTACHMENT_FIELD))
@@ -234,7 +234,3 @@ def convert_string(raw_data, headers=None):
         msg = MIMEBase(maintype, subtype, *headers)
         msg.set_payload(data)
     return msg
-
-
-
-
diff --git a/cloudinit/util.py b/cloudinit/util.py
index 91d20a76..56c01fab 100644
--- a/cloudinit/util.py
+++ b/cloudinit/util.py
@@ -35,7 +35,7 @@ import pwd
 import random
 import shutil
 import socket
-import string # pylint: disable=W0402
+import string  # pylint: disable=W0402
 import subprocess
 import sys
 import tempfile
@@ -153,13 +153,15 @@ def SilentTemporaryFile(**kwargs):
     # file to unlink has been unlinked elsewhere..
     LOG.debug("Created temporary file %s", fh.name)
     fh.unlink = del_file
-    # Add a new method that will unlink 
+
+    # Add a new method that will unlink
     # right 'now' but still lets the exit
     # method attempt to remove it (which will
     # not throw due to our del file being quiet
     # about files that are not there)
     def unlink_now():
         fh.unlink(fh.name)
+
     setattr(fh, 'unlink_now', unlink_now)
     return fh
 
@@ -199,7 +201,7 @@ def is_false_str(val, addons=None):
 
 def translate_bool(val, addons=None):
     if not val:
-        # This handles empty lists and false and 
+        # This handles empty lists and false and
         # other things that python believes are false
         return False
     # If its already a boolean skip
@@ -214,7 +216,6 @@ def rand_str(strlen=32, select_from=None):
     return "".join([random.choice(select_from) for _x in range(0, strlen)])
 
 
-
 def read_conf(fname):
     try:
         return load_yaml(load_file(fname), default={})
@@ -275,7 +276,7 @@ def is_ipv4(instr):
 
 def merge_base_cfg(cfgfile, cfg_builtin=None):
     syscfg = read_conf_with_confd(cfgfile)
-    
+
     kern_contents = read_cc_from_cmdline()
     kerncfg = {}
     if kern_contents:
@@ -575,7 +576,7 @@ def load_yaml(blob, default=None, allowed=(dict,)):
     try:
         blob = str(blob)
         LOG.debug(("Attempting to load yaml from string "
-                 "of length %s with allowed root types %s"), 
+                 "of length %s with allowed root types %s"),
                  len(blob), allowed)
         converted = yaml.load(blob)
         if not isinstance(converted, allowed):
@@ -625,7 +626,7 @@ def read_conf_d(confd):
 
     # remove anything not ending in '.cfg'
     confs = [f for f in confs if f.endswith(".cfg")]
-    
+
     # remove anything not a file
     confs = [f for f in confs if os.path.isfile(os.path.join(confd, f))]
 
@@ -726,9 +727,9 @@ def get_fqdn_from_hosts(hostname, filename="/etc/hosts"):
     """
     For each host a single line should be present with
       the following information:
-    
-	     IP_address canonical_hostname [aliases...]
-    
+
+        IP_address canonical_hostname [aliases...]
+
       Fields of the entry are separated by any number of  blanks  and/or  tab
       characters.  Text  from	a "#" character until the end of the line is a
       comment, and is ignored.	 Host  names  may  contain  only  alphanumeric
@@ -747,7 +748,7 @@ def get_fqdn_from_hosts(hostname, filename="/etc/hosts"):
             if not line:
                 continue
 
-            # If there there is less than 3 entries 
+            # If there there is less than 3 entries
             # (IP_address, canonical_hostname, alias)
             # then ignore this line
             toks = line.split()
@@ -829,7 +830,7 @@ def close_stdin():
         os.dup2(fp.fileno(), sys.stdin.fileno())
 
 
-def find_devs_with(criteria=None, oformat='device', 
+def find_devs_with(criteria=None, oformat='device',
                     tag=None, no_cache=False, path=None):
     """
     find devices matching given criteria (via blkid)
@@ -841,23 +842,23 @@ def find_devs_with(criteria=None, oformat='device',
     blk_id_cmd = ['blkid']
     options = []
     if criteria:
-        # Search for block devices with tokens named NAME that 
+        # Search for block devices with tokens named NAME that
         # have the value 'value' and display any devices which are found.
         # Common values for NAME include  TYPE, LABEL, and UUID.
         # If there are no devices specified on the command line,
-        # all block devices will be searched; otherwise, 
+        # all block devices will be searched; otherwise,
         # only search the devices specified by the user.
         options.append("-t%s" % (criteria))
     if tag:
         # For each (specified) device, show only the tags that match tag.
         options.append("-s%s" % (tag))
     if no_cache:
-        # If you want to start with a clean cache 
-        # (i.e. don't report devices previously scanned 
+        # If you want to start with a clean cache
+        # (i.e. don't report devices previously scanned
         # but not necessarily available at this time), specify /dev/null.
         options.extend(["-c", "/dev/null"])
     if oformat:
-        # Display blkid's output using the specified format. 
+        # Display blkid's output using the specified format.
         # The format parameter may be:
         # full, value, list, device, udev, export
         options.append('-o%s' % (oformat))
@@ -1104,7 +1105,7 @@ def mounts():
                 (dev, mp, fstype, opts, _freq, _passno) = mpline.split()
             except:
                 continue
-            # If the name of the mount point contains spaces these 
+            # If the name of the mount point contains spaces these
             # can be escaped as '\040', so undo that..
             mp = mp.replace("\\040", " ")
             mounted[dev] = {