Add pylint checks for python files in metal

Created a pylint.rc file for running pylint
Added a pylint task to zuul

Targets the following python files:
 - redfish docker code
 - hwmond_notify
Other python components in metal are not being included
because they are being removed in later commits.

Story: 2004515
Task: 37956
Change-Id: I782672c366e56d1f1597d40f5754444b2fa76b9e
Signed-off-by: Al Bailey <Al.Bailey@windriver.com>

.zuul.yaml

@@ -8,10 +8,12 @@
       jobs:
         - openstack-tox-linters
         - openstack-tox-pep8
+        - openstack-tox-pylint
     gate:
       jobs:
         - openstack-tox-linters
         - openstack-tox-pep8
+        - openstack-tox-pylint
 
 - job:
     name: flock-devstack-metal

pylint.rc

@@ -0,0 +1,256 @@
+[MASTER]
+# Specify a configuration file.
+rcfile=pylint.rc
+
+# Python code to execute, usually for sys.path manipulation such as
+# pygtk.require().
+#init-hook=
+
+# Add files or directories to the blacklist. Should be base names, not paths.
+ignore=tests
+
+# Pickle collected data for later comparisons.
+persistent=yes
+
+# List of plugins (as comma separated values of python modules names) to load,
+# usually to register additional checkers.
+load-plugins=
+
+# Use multiple processes to speed up Pylint.
+jobs=4
+
+# Allow loading of arbitrary C extensions. Extensions are imported into the
+# active Python interpreter and may run arbitrary code.
+unsafe-load-any-extension=no
+
+# A comma-separated list of package or module names from where C extensions may
+# be loaded. Extensions are loading into the active Python interpreter and may
+# run arbitrary code
+extension-pkg-whitelist=lxml.etree,greenlet
+
+
+
+[MESSAGES CONTROL]
+# Enable the message, report, category or checker with the given id(s). You can
+# either give multiple identifier separated by comma (,) or put this option
+# multiple time.
+#enable=
+
+# Disable the message, report, category or checker with the given id(s). You
+# can either give multiple identifier separated by comma (,) or put this option
+# multiple time (only on the command line, not in the configuration file where
+# it should appear only once).
+# See "Messages Control" section of
+# https://pylint.readthedocs.io/en/latest/user_guide
+# ** The following (C)onvention checks are being disabled:
+# C0103: Constant name doesn't conform to '(([A-Z_][A-Z0-9_]*)|(__.*__))$' pattern (invalid-name)
+# C0114: Missing module docstring (missing-module-docstring)
+# C0302: Too many lines in module (too-many-lines)
+# C1801: Do not use `len(SEQUENCE)` without comparison to determine if a sequence is empty (len-as-condition)
+# ** The following (R)efactor checks are being disabled:
+# R0205: Class from object, can be safely removed from bases in python3 (useless-object-inheritance)
+# R0902: Too many instance attributes (too-many-instance-attributes)
+# R0912: Too many branches (too-many-branches)
+# R0913: Too many arguments (too-many-arguments)
+# R0915: Too many statements (too-many-statements)
+# R1705: Unnecessary "else" after "return" (no-else-return)
+# R1723: Unnecessary "else" after "break" (no-else-break)
+# R1724: Unnecessary "else" after "continue" (no-else-continue)
+# ** The following (W)arnings should be fixed:
+# W0703: Catching too general exception Exception (broad-except)
+disable=C0103,C0114,C0302,C1801,
+        R0205,R0902,R0912,R0913,R0915,R1705,R1723,R1724,
+        W0703
+
+#disable=C, R, fixme
+
+[REPORTS]
+# Set the output format. Available formats are text, parseable, colorized, msvs
+# (visual studio) and html
+output-format=text
+
+# Put messages in a separate file for each module / package specified on the
+# command line instead of printing them on stdout. Reports (if any) will be
+# written in a file name "pylint_global.[txt|html]".
+files-output=no
+
+# Tells whether to display a full report or only the messages
+reports=no
+
+# Python expression which should return a note less than 10 (10 is the highest
+# note). You have access to the variables errors warning, statement which
+# respectively contain the number of errors / warnings messages and the total
+# number of statements analyzed. This is used by the global evaluation report
+# (RP0004).
+evaluation=10.0 - ((float(5 * error + warning + refactor + convention) / statement) * 10)
+
+
+[SIMILARITIES]
+# Minimum lines number of a similarity.
+min-similarity-lines=4
+
+# Ignore comments when computing similarities.
+ignore-comments=yes
+
+# Ignore docstrings when computing similarities.
+ignore-docstrings=yes
+
+
+[FORMAT]
+# Maximum number of characters on a single line.
+max-line-length=85
+
+# Maximum number of lines in a module
+max-module-lines=1000
+
+# String used as indentation unit. This is usually 4 spaces or "\t" (1 tab).
+indent-string='    '
+
+
+[TYPECHECK]
+# Tells whether missing members accessed in mixin class should be ignored. A
+# mixin class is detected if its name ends with "mixin" (case insensitive).
+ignore-mixin-members=yes
+
+# List of module names for which member attributes should not be checked
+# (useful for modules/projects where namespaces are manipulated during runtime
+# and thus existing member attributes cannot be deduced by static analysis
+ignored-modules=distutils,eventlet.green.subprocess,six,six.moves
+
+# List of classes names for which member attributes should not be checked
+# (useful for classes with attributes dynamically set).
+# pylint is confused by sqlalchemy Table, as well as sqlalchemy Enum types
+# ie: (unprovisioned, identity)
+# LookupDict in requests library confuses pylint
+ignored-classes=SQLObject, optparse.Values, thread._local, _thread._local,
+                Table, unprovisioned, identity, LookupDict
+
+# List of members which are set dynamically and missed by pylint inference
+# system, and so shouldn't trigger E0201 when accessed. Python regular
+# expressions are accepted.
+generated-members=REQUEST,acl_users,aq_parent
+
+
+[BASIC]
+# List of builtins function names that should not be used, separated by a comma
+bad-functions=map,filter,apply,input
+
+# Regular expression which should only match correct module names
+module-rgx=(([a-z_][a-z0-9_]*)|([A-Z][a-zA-Z0-9]+))$
+
+# Regular expression which should only match correct module level names
+const-rgx=(([A-Z_][A-Z0-9_]*)|(__.*__))$
+
+# Regular expression which should only match correct class names
+class-rgx=[A-Z_][a-zA-Z0-9]+$
+
+# Regular expression which should only match correct function names
+function-rgx=[a-z_][a-z0-9_]{2,30}$
+
+# Regular expression which should only match correct method names
+method-rgx=[a-z_][a-z0-9_]{2,30}$
+
+# Regular expression which should only match correct instance attribute names
+attr-rgx=[a-z_][a-z0-9_]{2,30}$
+
+# Regular expression which should only match correct argument names
+argument-rgx=[a-z_][a-z0-9_]{2,30}$
+
+# Regular expression which should only match correct variable names
+variable-rgx=[a-z_][a-z0-9_]{2,30}$
+
+# Regular expression which should only match correct list comprehension /
+# generator expression variable names
+inlinevar-rgx=[A-Za-z_][A-Za-z0-9_]*$
+
+# Good variable names which should always be accepted, separated by a comma
+good-names=i,j,k,ex,Run,_
+
+# Bad variable names which should always be refused, separated by a comma
+bad-names=foo,bar,baz,toto,tutu,tata
+
+# Regular expression which should only match functions or classes name which do
+# not require a docstring
+no-docstring-rgx=__.*__
+
+
+[MISCELLANEOUS]
+# List of note tags to take in consideration, separated by a comma.
+notes=FIXME,XXX,TODO
+
+
+[VARIABLES]
+# Tells whether we should check for unused import in __init__ files.
+init-import=no
+
+# A regular expression matching the beginning of the name of dummy variables
+# (i.e. not used).
+dummy-variables-rgx=_|dummy
+
+# List of additional names supposed to be defined in builtins. Remember that
+# you should avoid to define new builtins when possible.
+additional-builtins=
+
+
+[IMPORTS]
+# Deprecated modules which should not be used, separated by a comma
+deprecated-modules=regsub,string,TERMIOS,Bastion,rexec
+
+# Create a graph of every (i.e. internal and external) dependencies in the
+# given file (report RP0402 must not be disabled)
+import-graph=
+
+# Create a graph of external dependencies in the given file (report RP0402 must
+# not be disabled)
+ext-import-graph=
+
+# Create a graph of internal dependencies in the given file (report RP0402 must
+# not be disabled)
+int-import-graph=
+
+
+[DESIGN]
+# Maximum number of arguments for function / method
+max-args=5
+
+# Argument names that match this expression will be ignored. Default to name
+# with leading underscore
+ignored-argument-names=_.*
+
+# Maximum number of locals for function / method body
+max-locals=15
+
+# Maximum number of return / yield for function / method body
+max-returns=6
+
+# Maximum number of branch for function / method body
+max-branchs=12
+
+# Maximum number of statements in function / method body
+max-statements=50
+
+# Maximum number of parents for a class (see R0901).
+max-parents=7
+
+# Maximum number of attributes for a class (see R0902).
+max-attributes=7
+
+# Minimum number of public methods for a class (see R0903).
+min-public-methods=2
+
+# Maximum number of public methods for a class (see R0904).
+max-public-methods=20
+
+
+[CLASSES]
+# List of method names used to declare (i.e. assign) instance attributes.
+defining-attr-methods=__init__,__new__,setUp
+
+# List of valid names for the first argument in a class method.
+valid-classmethod-first-arg=cls
+
+
+[EXCEPTIONS]
+# Exceptions that will emit a warning when being caught. Defaults to
+# "Exception"
+overgeneral-exceptions=Exception

tox.ini

@@ -38,6 +38,19 @@ commands =
             -o -type f -name '*.yaml'       \
             -print0 | xargs -0 yamllint"
 
+[testenv:pylint]
+basepython = python3
+usedevelop = False
+description =
+    Pylint check
+deps = {[testenv]deps}
+       redfish
+       pylint
+commands =
+     pylint {posargs} --rcfile=./pylint.rc \
+         tools/rvmc/centos/docker/rvmc.py \
+         mtce/src/hwmon/scripts/hwmond_notify.py
+
 [testenv:pep8]
 basepython = python3
 usedevelop = False