Fix use of bytes in cliconf plugins for Python 3 (#37715)

* Remove raw byte-strings from cliconf plugins of supported platforms + edgeos

Remove uses of to_bytes, too

* Update CliConfBase docstring to reflect current position on byte strings

lib/ansible/plugins/cliconf/__init__.py

@@ -55,13 +55,11 @@ class CliconfBase(with_metaclass(ABCMeta, object)):
     """
     A base class for implementing cli connections
 
-    .. note:: Unlike most of Ansible, nearly all strings in
-        :class:`CliconfBase` plugins are byte strings.  This is because of
-        how close to the underlying platform these plugins operate.  Remember
-        to mark literal strings as byte string (``b"string"``) and to use
-        :func:`~ansible.module_utils._text.to_bytes` and
-        :func:`~ansible.module_utils._text.to_text` to avoid unexpected
-        problems.
+    .. note:: String inputs to :meth:`send_command` will be cast to byte strings
+         within this method and as such are not required to be made byte strings
+         beforehand.  Please avoid using literal byte strings (``b'string'``) in
+         :class:`CliConfBase` plugins as this can lead to unexpected errors when
+         running on Python 3
 
     List of supported rpc's:
         :get_config: Retrieves the specified configuration from the device

lib/ansible/plugins/cliconf/edgeos.py

@@ -10,7 +10,7 @@ import json
 
 from itertools import chain
 
-from ansible.module_utils._text import to_bytes, to_text
+from ansible.module_utils._text import to_text
 from ansible.module_utils.network.common.utils import to_list
 from ansible.plugins.cliconf import CliconfBase
 
@@ -21,7 +21,7 @@ class Cliconf(CliconfBase):
         device_info = {}
 
         device_info['network_os'] = 'edgeos'
-        reply = self.get(b'show version')
+        reply = self.get('show version')
         data = to_text(reply, errors='surrogate_or_strict').strip()
 
         match = re.search(r'Version:\s*v?(\S+)', data)
@@ -32,24 +32,21 @@ class Cliconf(CliconfBase):
         if match:
             device_info['network_os_model'] = match.group(1)
 
-        reply = self.get(b'show host name')
+        reply = self.get('show host name')
         reply = to_text(reply, errors='surrogate_or_strict').strip()
         device_info['network_os_hostname'] = reply
 
         return device_info
 
     def get_config(self, source='running', format='text'):
-        return self.send_command(b'show configuration commands')
+        return self.send_command('show configuration commands')
 
     def edit_config(self, command):
-        for cmd in chain([b'configure'], to_list(command)):
+        for cmd in chain(['configure'], to_list(command)):
             self.send_command(cmd)
 
     def get(self, command, prompt=None, answer=None, sendonly=False):
-        return self.send_command(to_bytes(command),
-                                 prompt=to_bytes(prompt),
-                                 answer=to_bytes(answer),
-                                 sendonly=sendonly)
+        return self.send_command(command, prompt=prompt, answer=answer, sendonly=sendonly)
 
     def commit(self, comment=None):
         if comment:
@@ -59,7 +56,7 @@ class Cliconf(CliconfBase):
         self.send_command(command)
 
     def discard_changes(self, *args, **kwargs):
-        self.send_command(b'discard')
+        self.send_command('discard')
 
     def get_capabilities(self):
         result = {}

lib/ansible/plugins/cliconf/eos.py

@@ -33,13 +33,13 @@ class Cliconf(CliconfBase):
         device_info = {}
 
         device_info['network_os'] = 'eos'
-        reply = self.get(b'show version | json')
+        reply = self.get('show version | json')
         data = json.loads(reply)
 
         device_info['network_os_version'] = data['version']
         device_info['network_os_model'] = data['modelName']
 
-        reply = self.get(b'show hostname | json')
+        reply = self.get('show hostname | json')
         data = json.loads(reply)
 
         device_info['network_os_hostname'] = data['hostname']
@@ -52,9 +52,9 @@ class Cliconf(CliconfBase):
         if source not in lookup:
             return self.invalid_params("fetching configuration from %s is not supported" % source)
 
-        cmd = b'show %s ' % lookup[source]
+        cmd = 'show %s ' % lookup[source]
         if format and format is not 'text':
-            cmd += b'| %s ' % format
+            cmd += '| %s ' % format
 
         cmd += ' '.join(to_list(flags))
         cmd = cmd.strip()
@@ -62,7 +62,7 @@ class Cliconf(CliconfBase):
 
     @enable_mode
     def edit_config(self, command):
-        for cmd in chain([b'configure'], to_list(command), [b'end']):
+        for cmd in chain(['configure'], to_list(command), ['end']):
             self.send_command(cmd)
 
     def get(self, command, prompt=None, answer=None, sendonly=False):

lib/ansible/plugins/cliconf/ios.py

@@ -24,7 +24,7 @@ import json
 
 from itertools import chain
 
-from ansible.module_utils._text import to_bytes, to_text
+from ansible.module_utils._text import to_text
 from ansible.module_utils.network.common.utils import to_list
 from ansible.plugins.cliconf import CliconfBase, enable_mode
 
@@ -35,7 +35,7 @@ class Cliconf(CliconfBase):
         device_info = {}
 
         device_info['network_os'] = 'ios'
-        reply = self.get(b'show version')
+        reply = self.get('show version')
         data = to_text(reply, errors='surrogate_or_strict').strip()
 
         match = re.search(r'Version (\S+),', data)

lib/ansible/plugins/cliconf/iosxr.py

@@ -24,7 +24,7 @@ import json
 
 from itertools import chain
 
-from ansible.module_utils._text import to_bytes, to_text
+from ansible.module_utils._text import to_text
 from ansible.module_utils.network.common.utils import to_list
 from ansible.plugins.cliconf import CliconfBase
 
@@ -35,7 +35,7 @@ class Cliconf(CliconfBase):
         device_info = {}
 
         device_info['network_os'] = 'iosxr'
-        reply = self.get(b'show version | utility head -n 20')
+        reply = self.get('show version | utility head -n 20')
         data = to_text(reply, errors='surrogate_or_strict').strip()
 
         match = re.search(r'Version (\S+)$', data, re.M)
@@ -61,9 +61,9 @@ class Cliconf(CliconfBase):
         if source not in lookup:
             return self.invalid_params("fetching configuration from %s is not supported" % source)
         if filter:
-            cmd = to_bytes('show {0} {1}'.format(lookup[source], filter), errors='surrogate_or_strict')
+            cmd = 'show {0} {1}'.format(lookup[source], filter)
         else:
-            cmd = to_bytes('show {0}'.format(lookup[source]), errors='surrogate_or_strict')
+            cmd = 'show {0}'.format(lookup[source])
 
         return self.send_command(cmd)
 
@@ -94,10 +94,10 @@ class Cliconf(CliconfBase):
             command = 'commit comment {0}'.format(comment)
         else:
             command = 'commit'
-        self.send_command(to_bytes(command))
+        self.send_command(command)
 
     def discard_changes(self):
-        self.send_command(b'abort')
+        self.send_command('abort')
 
     def get_capabilities(self):
         result = {}

lib/ansible/plugins/cliconf/junos.py

@@ -23,7 +23,7 @@ import json
 import re
 from itertools import chain
 
-from ansible.module_utils._text import to_bytes, to_text
+from ansible.module_utils._text import to_text
 from ansible.module_utils.network.common.utils import to_list
 from ansible.plugins.cliconf import CliconfBase
 
@@ -78,15 +78,15 @@ class Cliconf(CliconfBase):
             comment: Optional commit description.
         """
         comment = kwargs.get('comment', None)
-        command = b'commit'
+        command = 'commit'
         if comment:
-            command += b' comment {0}'.format(comment)
-        command += b' and-quit'
+            command += ' comment {0}'.format(comment)
+        command += ' and-quit'
         return self.send_command(command)
 
     def discard_changes(self):
-        command = b'rollback 0'
-        for cmd in chain(to_list(command), b'exit'):
+        command = 'rollback 0'
+        for cmd in chain(to_list(command), 'exit'):
             self.send_command(cmd)
 
     def get_capabilities(self):
@@ -97,7 +97,7 @@ class Cliconf(CliconfBase):
         return json.dumps(result)
 
     def compare_configuration(self, rollback_id=None):
-        command = b'show | compare'
+        command = 'show | compare'
         if rollback_id is not None:
-            command += b' rollback %s' % int(rollback_id)
+            command += ' rollback %s' % int(rollback_id)
         return self.send_command(command)

lib/ansible/plugins/cliconf/nxos.py

@@ -53,7 +53,7 @@ class Cliconf(CliconfBase):
     def get_config(self, source='running', format='text', flags=None):
         lookup = {'running': 'running-config', 'startup': 'startup-config'}
 
-        cmd = 'show {} '.format(lookup[source])
+        cmd = 'show {0} '.format(lookup[source])
         if flags:
             cmd += ' '.join(flags)
         cmd = cmd.strip()

lib/ansible/plugins/cliconf/vyos.py

@@ -24,7 +24,7 @@ import json
 
 from itertools import chain
 
-from ansible.module_utils._text import to_bytes, to_text
+from ansible.module_utils._text import to_text
 from ansible.module_utils.network.common.utils import to_list
 from ansible.plugins.cliconf import CliconfBase
 
@@ -35,7 +35,7 @@ class Cliconf(CliconfBase):
         device_info = {}
 
         device_info['network_os'] = 'vyos'
-        reply = self.get(b'show version')
+        reply = self.get('show version')
         data = to_text(reply, errors='surrogate_or_strict').strip()
 
         match = re.search(r'Version:\s*(\S+)', data)
@@ -46,17 +46,17 @@ class Cliconf(CliconfBase):
         if match:
             device_info['network_os_model'] = match.group(1)
 
-        reply = self.get(b'show host name')
+        reply = self.get('show host name')
         device_info['network_os_hostname'] = to_text(reply, errors='surrogate_or_strict').strip()
 
         return device_info
 
     def get_config(self, source='running', format='text'):
-        return self.send_command(b'show configuration commands')
+        return self.send_command('show configuration commands')
 
     def edit_config(self, command):
         for cmd in chain(['configure'], to_list(command)):
-            self.send_command(to_bytes(cmd))
+            self.send_command(cmd)
 
     def get(self, command, prompt=None, answer=None, sendonly=False):
         return self.send_command(command, prompt=prompt, answer=answer, sendonly=sendonly)
@@ -66,10 +66,10 @@ class Cliconf(CliconfBase):
             command = 'commit comment "{0}"'.format(comment)
         else:
             command = 'commit'
-        self.send_command(to_bytes(command))
+        self.send_command(command)
 
     def discard_changes(self, *args, **kwargs):
-        self.send_command(b'exit discard')
+        self.send_command('exit discard')
 
     def get_capabilities(self):
         result = {}

test/sanity/pylint/ignore.txt

@@ -67,8 +67,6 @@ lib/ansible/modules/storage/infinidat/infini_vol.py ansible-format-automatic-spe
 lib/ansible/modules/storage/purestorage/purefa_host.py ansible-format-automatic-specification
 lib/ansible/modules/storage/purestorage/purefa_pg.py ansible-format-automatic-specification
 lib/ansible/modules/system/firewalld.py ansible-format-automatic-specification
-lib/ansible/plugins/cliconf/junos.py ansible-no-format-on-bytestring 3
-lib/ansible/plugins/cliconf/nxos.py ansible-format-automatic-specification
 test/runner/injector/importer.py missing-docstring 3.7
 test/runner/injector/injector.py missing-docstring 3.7
 test/runner/lib/ansible_util.py missing-docstring 3.7