run pylint3 and fixed report

This commit adds a pylint configuration and fixed all found issues.

Signed-off-by: Claudius Heine <ch@denx.de>

.pylintrc

@@ -0,0 +1,407 @@
+[MASTER]
+
+# Specify a configuration file.
+#rcfile=
+
+# Python code to execute, usually for sys.path manipulation such as
+# pygtk.require().
+#init-hook=
+
+# Add files or directories to the blacklist. They should be base names, not
+# paths.
+ignore=CVS
+
+# Add files or directories matching the regex patterns to the blacklist. The
+# regex matches against base names, not paths.
+ignore-patterns=
+
+# 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=1
+
+# 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=
+
+# Allow optimization of some AST trees. This will activate a peephole AST
+# optimizer, which will apply various small optimizations. For instance, it can
+# be used to obtain the result of joining multiple strings with the addition
+# operator. Joining a lot of strings can lead to a maximum recursion error in
+# Pylint and this flag can prevent that. It has one side effect, the resulting
+# AST will be different than the one from reality. This option is deprecated
+# and it will be removed in Pylint 2.0.
+optimize-ast=no
+
+
+[MESSAGES CONTROL]
+
+# Only show warnings with the listed confidence levels. Leave empty to show
+# all. Valid levels: HIGH, INFERENCE, INFERENCE_FAILURE, UNDEFINED
+confidence=
+
+# 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 (only on the command line, not in the configuration file where
+# it should appear only once). See also the "--disable" option for examples.
+#enable=
+
+# Disable the message, report, category or checker with the given id(s). You
+# can either give multiple identifiers separated by comma (,) or put this
+# option multiple times (only on the command line, not in the configuration
+# file where it should appear only once).You can also use "--disable=all" to
+# disable everything first and then reenable specific checks. For example, if
+# you want to run only the similarities checker, you can use "--disable=all
+# --enable=similarities". If you want to run only the classes checker, but have
+# no Warning level messages displayed, use"--disable=all --enable=classes
+# --disable=W"
+disable=too-few-public-methods,locally-disabled
+
+
+[REPORTS]
+
+# Set the output format. Available formats are text, parseable, colorized, msvs
+# (visual studio) and html. You can also give a reporter class, eg
+# mypackage.mymodule.MyReporterClass.
+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]". This option is deprecated
+# and it will be removed in Pylint 2.0.
+files-output=no
+
+# Tells whether to display a full report or only the messages
+reports=yes
+
+# 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)
+
+# Template used to display messages. This is a python new-style format string
+# used to format the message information. See doc for all details
+#msg-template=
+
+
+[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
+
+# Ignore imports when computing similarities.
+ignore-imports=no
+
+
+[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 name of dummy variables (i.e. expectedly
+# not used).
+dummy-variables-rgx=(_+[a-zA-Z0-9]*?$)|dummy
+
+# List of additional names supposed to be defined in builtins. Remember that
+# you should avoid to define new builtins when possible.
+additional-builtins=
+
+# List of strings which can identify a callback function by name. A callback
+# name must start or end with one of those strings.
+callbacks=cb_,_cb
+
+# List of qualified module names which can have objects that can redefine
+# builtins.
+redefining-builtins-modules=six.moves,future.builtins
+
+
+[SPELLING]
+
+# Spelling dictionary name. Available dictionaries: none. To make it working
+# install python-enchant package.
+spelling-dict=
+
+# List of comma separated words that should not be checked.
+spelling-ignore-words=
+
+# A path to a file that contains private dictionary; one word per line.
+spelling-private-dict-file=
+
+# Tells whether to store unknown words to indicated private dictionary in
+# --spelling-private-dict-file option instead of raising a message.
+spelling-store-unknown-words=no
+
+
+[FORMAT]
+
+# Maximum number of characters on a single line.
+max-line-length=100
+
+# Regexp for a line that is allowed to be longer than the limit.
+ignore-long-lines=^\s*(# )?<?https?://\S+>?$
+
+# Allow the body of an if to be on the same line as the test if there is no
+# else.
+single-line-if-stmt=no
+
+# List of optional constructs for which whitespace checking is disabled. `dict-
+# separator` is used to allow tabulation in dicts, etc.: {1  : 1,\n222: 2}.
+# `trailing-comma` allows a space between comma and closing bracket: (a, ).
+# `empty-line` allows space-only lines.
+no-space-check=trailing-comma,dict-separator
+
+# 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='    '
+
+# Number of spaces of indent required inside a hanging  or continued line.
+indent-after-paren=4
+
+# Expected format of line ending, e.g. empty (any line ending), LF or CRLF.
+expected-line-ending-format=
+
+
+[LOGGING]
+
+# Logging modules to check that the string format arguments are in logging
+# function parameter format
+logging-modules=logging
+
+
+[BASIC]
+
+# 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
+
+# Colon-delimited sets of names that determine each other's naming style when
+# the name regexes allow several styles.
+name-group=
+
+# Include a hint for the correct naming format with invalid-name
+include-naming-hint=yes
+
+# List of decorators that produce properties, such as abc.abstractproperty. Add
+# to this list to register other decorators that produce valid properties.
+property-classes=abc.abstractproperty
+
+# Regular expression matching correct argument names
+argument-rgx=[a-z_][a-z0-9_]{2,30}$
+
+# Naming hint for argument names
+argument-name-hint=[a-z_][a-z0-9_]{2,30}$
+
+# Regular expression matching correct attribute names
+attr-rgx=[a-z_][a-z0-9_]{2,30}$
+
+# Naming hint for attribute names
+attr-name-hint=[a-z_][a-z0-9_]{2,30}$
+
+# Regular expression matching correct class attribute names
+class-attribute-rgx=([A-Za-z_][A-Za-z0-9_]{2,30}|(__.*__))$
+
+# Naming hint for class attribute names
+class-attribute-name-hint=([A-Za-z_][A-Za-z0-9_]{2,30}|(__.*__))$
+
+# Regular expression matching correct method names
+method-rgx=[a-z_][a-z0-9_]{2,30}$
+
+# Naming hint for method names
+method-name-hint=[a-z_][a-z0-9_]{2,30}$
+
+# Regular expression matching correct constant names
+const-rgx=(([A-Z_][A-Z0-9_]*)|(__.*__))$
+
+# Naming hint for constant names
+const-name-hint=(([A-Z_][A-Z0-9_]*)|(__.*__))$
+
+# Regular expression matching correct module names
+module-rgx=(([a-z_][a-z0-9_]*)|([A-Z][a-zA-Z0-9]+))$
+
+# Naming hint for module names
+module-name-hint=(([a-z_][a-z0-9_]*)|([A-Z][a-zA-Z0-9]+))$
+
+# Regular expression matching correct variable names
+variable-rgx=[a-z_][a-z0-9_]{2,30}$
+
+# Naming hint for variable names
+variable-name-hint=[a-z_][a-z0-9_]{2,30}$
+
+# Regular expression matching correct function names
+function-rgx=[a-z_][a-z0-9_]{2,30}$
+
+# Naming hint for function names
+function-name-hint=[a-z_][a-z0-9_]{2,30}$
+
+# Regular expression matching correct inline iteration names
+inlinevar-rgx=[A-Za-z_][A-Za-z0-9_]*$
+
+# Naming hint for inline iteration names
+inlinevar-name-hint=[A-Za-z_][A-Za-z0-9_]*$
+
+# Regular expression matching correct class names
+class-rgx=[A-Z_][a-zA-Z0-9]+$
+
+# Naming hint for class names
+class-name-hint=[A-Z_][a-zA-Z0-9]+$
+
+# Regular expression which should only match function or class names that do
+# not require a docstring.
+no-docstring-rgx=^_
+
+# Minimum line length for functions/classes that require docstrings, shorter
+# ones are exempt.
+docstring-min-length=-1
+
+
+[ELIF]
+
+# Maximum number of nested blocks for function / method body
+max-nested-blocks=5
+
+
+[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. It
+# supports qualified module names, as well as Unix pattern matching.
+ignored-modules=
+
+# List of class names for which member attributes should not be checked (useful
+# for classes with dynamically set attributes). This supports the use of
+# qualified names.
+ignored-classes=optparse.Values,thread._local,_thread._local
+
+# List of members which are set dynamically and missed by pylint inference
+# system, and so shouldn't trigger E1101 when accessed. Python regular
+# expressions are accepted.
+generated-members=
+
+# List of decorators that produce context managers, such as
+# contextlib.contextmanager. Add to this list to register other decorators that
+# produce valid context managers.
+contextmanager-decorators=contextlib.contextmanager
+
+
+[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-branches=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
+
+# Maximum number of boolean expressions in a if statement
+max-bool-expr=5
+
+
+[IMPORTS]
+
+# Deprecated modules which should not be used, separated by a comma
+deprecated-modules=optparse
+
+# 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=
+
+# Force import order to recognize a module as part of the standard
+# compatibility libraries.
+known-standard-library=
+
+# Force import order to recognize a module as part of a third party library.
+known-third-party=enchant
+
+# Analyse import fallback blocks. This can be used to support both Python 2 and
+# 3 compatible code, which means that the block might have code that exists
+# only in one or another interpreter, leading to false positives when analysed.
+analyse-fallback-blocks=no
+
+
+[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
+
+# List of valid names for the first argument in a metaclass class method.
+valid-metaclass-classmethod-first-arg=mcs
+
+# List of member names, which should be excluded from the protected access
+# warning.
+exclude-protected=_asdict,_fields,_replace,_source,_make
+
+
+[EXCEPTIONS]
+
+# Exceptions that will emit a warning when being caught. Defaults to
+# "Exception"
+overgeneral-exceptions=Exception

README.md

@@ -29,7 +29,8 @@ Dependencies & installation
 This projects depends on
 
 - Python 3
-- PyYAML
+- distro Python 3 package
+- PyYAML Python 3 package
 
 If you need Python 2 support consider sending patches. The most
 obvious place to start is to use the trollius package intead of

kas/__init__.py

@@ -19,6 +19,9 @@
 # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 # SOFTWARE.
+"""
+    kas - setup tool for bitbake based projects
+"""
 
 from .__version__ import __version__
 

kas/__main__.py

@@ -21,6 +21,9 @@
 # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 # SOFTWARE.
+"""
+    The main entry point of kas, a setup tool for bitbake based projects
+"""
 
 from .kas import main
 

kas/__version__.py

@@ -1 +1,28 @@
+# kas - setup tool for bitbake based projects
+#
+# Copyright (c) Siemens AG, 2017
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be
+# included in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+"""
+    This module contains the version of kas.
+"""
+__license__ = 'MIT'
+__copyright__ = 'Copyright (c) Siemens AG, 2017'
+
 __version__ = '0.9.0'

kas/build.py

@@ -19,6 +19,9 @@
 # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 # SOFTWARE.
+"""
+    The build plugin for kas.
+"""
 
 import os
 from .config import load_config
@@ -33,6 +36,10 @@ __copyright__ = 'Copyright (c) Siemens AG, 2017'
 
 
 class Build:
+    """
+        This class implements the build plugin for kas.
+    """
+
     def __init__(self, parser):
         bld_psr = parser.add_parser('build')
 
@@ -49,6 +56,11 @@ class Build:
                              default=[])
 
     def run(self, args):
+        """
+            Executes the build command of the kas plugin.
+        """
+        # pylint: disable=no-self-use
+
         if args.cmd != 'build':
             return False
 
@@ -82,14 +94,21 @@ class Build:
 
 
 class BuildCommand(Command):
+    """
+        Implement the bitbake build step.
+    """
+
     def __init__(self, task):
-        Command.__init__
+        super().__init__()
         self.task = task
 
     def __str__(self):
         return 'build'
 
     def execute(self, config):
+        """
+            Executes the bitbake build command.
+        """
         # Start bitbake build of image
         bitbake = find_program(config.environ['PATH'], 'bitbake')
         run_cmd([bitbake, '-k', config.get_bitbake_target(), '-c', self.task],

kas/config.py

@@ -19,14 +19,31 @@
 # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 # SOFTWARE.
+"""
+    This module contains the implementation of the kas configuration.
+"""
 
 import os
 import sys
 import logging
 import errno
 import json
-import platform
 import yaml
+
+try:
+    from distro import id as get_distro_id
+except ImportError:
+    import platform
+
+    def get_distro_id():
+        """
+            Wrapper around platform.dist to simulate distro.id
+            platform.dist is deprecated and will be removed in python 3.7
+            Use the 'distro' package instead.
+        """
+        # pylint: disable=deprecated-method
+        return platform.dist()[0]
+
 from .repos import Repo
 from .libkas import run_cmd
 
@@ -35,24 +52,39 @@ __copyright__ = 'Copyright (c) Siemens AG, 2017'
 
 
 class Config:
+    """
+        This is an abstract class, that defines the interface of the
+        kas configuration.
+    """
     def __init__(self):
         self.__kas_work_dir = os.environ.get('KAS_WORK_DIR', os.getcwd())
+        self.environ = {}
 
     @property
     def build_dir(self):
+        """
+            The path of the build directory.
+        """
         return os.path.join(self.__kas_work_dir, 'build')
 
     @property
     def kas_work_dir(self):
+        """
+            The path to the kas work directory.
+        """
         return self.__kas_work_dir
 
     def setup_environ(self):
-        (distro, version, id) = platform.dist()
-        if distro in ['fedora', 'SuSE']:
+        """
+            Sets the environment variables for process that are
+            started by kas.
+        """
+        distro_id = get_distro_id()
+        if distro_id in ['fedora', 'SuSE']:
             self.environ = {'LC_ALL': 'en_US.utf8',
                             'LANG': 'en_US.utf8',
                             'LANGUAGE': 'en_US'}
-        elif distro in ['Ubuntu', 'debian']:
+        elif distro_id in ['Ubuntu', 'debian']:
             self.environ = {'LC_ALL': 'en_US.UTF-8',
                             'LANG': 'en_US.UTF-8',
                             'LANGUAGE': 'en_US:en'}
@@ -61,17 +93,27 @@ class Config:
             self.environ = {}
 
     def get_repo_ref_dir(self):
+        """
+            The path to the directory that contains the repository references.
+        """
+        # pylint: disable=no-self-use
+
         return os.environ.get('KAS_REPO_REF_DIR', None)
 
 
 class ConfigPython(Config):
+    """
+        Implementation of a configuration that uses a Python script.
+    """
     def __init__(self, filename, target):
+        # pylint: disable=exec-used
+
         super().__init__()
         self.filename = os.path.abspath(filename)
         try:
-            with open(self.filename) as file:
+            with open(self.filename) as fds:
                 env = {}
-                data = file.read()
+                data = fds.read()
                 exec(data, env)
                 self._config = env
         except IOError:
@@ -82,80 +124,119 @@ class ConfigPython(Config):
         self.setup_environ()
 
     def __str__(self):
-        s = 'target: {}\n'.format(self.target)
-        s += 'repos:\n'
-        for r in self.get_repos():
-            s += '  {}\n'.format(r.__str__())
-        s += 'environ:\n'
-        for k, v in self.environ.items():
-            s += '  {} = {}\n'.format(k, v)
-        s += 'proxy:\n'
-        for k, v in self.get_proxy_config().items():
-            s += '  {} = {}\n'.format(k, v)
-        return s
+        output = 'target: {}\n'.format(self.target)
+        output += 'repos:\n'
+        for repo in self.get_repos():
+            output += '  {}\n'.format(repo.__str__())
+        output += 'environ:\n'
+        for key, value in self.environ.items():
+            output += '  {} = {}\n'.format(key, value)
+        output += 'proxy:\n'
+        for key, value in self.get_proxy_config().items():
+            output += '  {} = {}\n'.format(key, value)
+        return output
 
     def pre_hook(self, fname):
+        """
+            Returns a function that is executed before every command or None.
+        """
         try:
             self._config[fname + '_prepend'](self)
         except KeyError:
             pass
 
     def post_hook(self, fname):
+        """
+            Returs a function that is executed after every command or None.
+        """
         try:
             self._config[fname + '_append'](self)
         except KeyError:
             pass
 
     def get_hook(self, fname):
+        """
+            Returns a function that is executed instead of the command or None.
+        """
         try:
             return self._config[fname]
         except KeyError:
             return None
 
     def create_config(self, target):
+        """
+            Sets the configuration for `target`
+        """
         self.target = target
         self.repos = self._config['get_repos'](self, target)
 
     def get_proxy_config(self):
+        """
+            Returns the proxy settings
+        """
         return self._config['get_proxy_config']()
 
     def get_repos(self):
+        """
+            Returns the list of repos
+        """
         return iter(self.repos)
 
     def get_target(self):
+        """
+            Returns the target
+        """
         return self.target
 
     def get_bitbake_target(self):
+        """
+            Return the bitbake target
+        """
         try:
             return self._config['get_bitbake_target'](self)
         except KeyError:
             return self.target
 
     def get_bblayers_conf_header(self):
+        """
+            Returns the bblayers.conf header
+        """
         try:
             return self._config['get_bblayers_conf_header']()
         except KeyError:
             return ''
 
     def get_local_conf_header(self):
+        """
+            Returns the local.conf header
+        """
         try:
             return self._config['get_local_conf_header']()
-        except:
+        except KeyError:
             return ''
 
     def get_machine(self):
+        """
+            Returns the machine
+        """
         try:
             return self._config['get_machine'](self)
         except KeyError:
             return 'qemu'
 
     def get_distro(self):
+        """
+            Returns the distro
+        """
         try:
             return self._config['get_distro'](self)
         except KeyError:
             return 'poky'
 
     def get_gitlabci_config(self):
+        """
+            Returns the GitlabCI configuration
+        """
         try:
             return self._config['get_gitlabci_config'](self)
         except KeyError:
@@ -163,21 +244,37 @@ class ConfigPython(Config):
 
 
 class ConfigStatic(Config):
-    def __init__(self, filename, target):
+    """
+        An abstract class for static configuration files
+    """
+
+    def __init__(self, filename, _):
         super().__init__()
         self.filename = os.path.abspath(filename)
-        self._config = []
+        self._config = {}
 
-    def pre_hook(self, target):
+    def pre_hook(self, _):
+        """
+            Not used
+        """
         pass
 
-    def post_hook(self, target):
+    def post_hook(self, _):
+        """
+            Not used
+        """
         pass
 
-    def get_hook(self, fname):
-        return None
+    def get_hook(self, _):
+        """
+            Not used
+        """
+        pass
 
     def get_proxy_config(self):
+        """
+            Returns the proxy settings
+        """
         try:
             return self._config['proxy_config']
         except KeyError:
@@ -186,6 +283,9 @@ class ConfigStatic(Config):
                     'no_proxy': os.environ.get('no_proxy', '')}
 
     def get_repos(self):
+        """
+            Returns the list of repos
+        """
         repos = []
         for repo in self._config['repos']:
             try:
@@ -196,57 +296,75 @@ class ConfigStatic(Config):
             url = repo['url']
             if url == '':
                 # in-tree configuration
-                (rc, output) = run_cmd(['/usr/bin/git',
-                                        'rev-parse',
-                                        '--show-toplevel'],
-                                       cwd=os.path.dirname(self.filename),
-                                       env=self.environ)
+                (_, output) = run_cmd(['/usr/bin/git',
+                                       'rev-parse',
+                                       '--show-toplevel'],
+                                      cwd=os.path.dirname(self.filename),
+                                      env=self.environ)
                 url = output.strip()
-                r = Repo(url=url,
-                         path=url,
-                         sublayers=sublayers)
-                r.disable_git_operations()
+                rep = Repo(url=url,
+                           path=url,
+                           sublayers=sublayers)
+                rep.disable_git_operations()
             else:
                 name = os.path.basename(os.path.splitext(url)[0])
-                r = Repo(url=url,
-                         path=os.path.join(self.kas_work_dir, name),
-                         refspec=repo['refspec'],
-                         sublayers=sublayers)
-            repos.append(r)
+                rep = Repo(url=url,
+                           path=os.path.join(self.kas_work_dir, name),
+                           refspec=repo['refspec'],
+                           sublayers=sublayers)
+            repos.append(rep)
 
         return repos
 
     def get_bitbake_target(self):
+        """
+            Return the bitbake target
+        """
         try:
             return self._config['target']
         except KeyError:
             return 'core-image-minimal'
 
     def get_bblayers_conf_header(self):
+        """
+            Returns the bblayers.conf header
+        """
         try:
             return self._config['bblayers_conf_header']
         except KeyError:
             return ''
 
     def get_local_conf_header(self):
+        """
+            Returns the local.conf header
+        """
         try:
             return self._config['local_conf_header']
         except KeyError:
             return ''
 
     def get_machine(self):
+        """
+            Returns the machine
+        """
         try:
             return self._config['machine']
         except KeyError:
             return 'qemu'
 
     def get_distro(self):
+        """
+            Returns the distro
+        """
         try:
             return self._config['distro']
         except KeyError:
             return 'poky'
 
     def get_gitlabci_config(self):
+        """
+            Returns the GitlabCI configuration
+        """
         try:
             return self._config['gitlabci_config']
         except KeyError:
@@ -254,47 +372,60 @@ class ConfigStatic(Config):
 
 
 class ConfigJson(ConfigStatic):
+    """
+        Implements the configuration based on JSON files
+    """
+
     def __init__(self, filename, target):
         super().__init__(filename, target)
         self.filename = os.path.abspath(filename)
         try:
-            with open(self.filename, 'r') as f:
-                self._config = json.load(f)
+            with open(self.filename, 'r') as fds:
+                self._config = json.load(fds)
         except json.decoder.JSONDecodeError as msg:
-            logging.error('Could not load JSON config: {}'.format(msg))
+            logging.error('Could not load JSON config: %s', msg)
             sys.exit(1)
         self.setup_environ()
 
     def get_bblayers_conf_header(self):
-        list = super().get_bblayers_conf_header()
+        header_list = super().get_bblayers_conf_header()
         conf = ''
-        for line in list:
+        for line in header_list:
             conf += str(line) + '\n'
         return conf
 
     def get_local_conf_header(self):
-        list = super().get_local_conf_header()
+        header_list = super().get_local_conf_header()
         conf = ''
-        for line in list:
+        for line in header_list:
             conf += str(line) + '\n'
         return conf
 
 
 class ConfigYaml(ConfigStatic):
+    """
+        Implements  the configuration based on Yaml files
+    """
+
     def __init__(self, filename, target):
         super().__init__(filename, target)
         self.filename = os.path.abspath(filename)
         try:
-            with open(self.filename, 'r') as f:
-                self._config = yaml.load(f)
+            with open(self.filename, 'r') as fds:
+                self._config = yaml.load(fds)
         except yaml.loader.ParserError as msg:
-            logging.error('Could not load YAML config: {}'.format(msg))
+            logging.error('Could not load YAML config: %s', msg)
             sys.exit(1)
         self.setup_environ()
 
 
 def load_config(filename, target):
-    f, ext = os.path.splitext(filename)
+    """
+        Return configuration generated from `filename`.
+    """
+    # pylint: disable=redefined-variable-type
+
+    (_, ext) = os.path.splitext(filename)
     if ext == '.py':
         cfg = ConfigPython(filename, target)
     elif ext == '.json':

kas/kas.py

@@ -21,6 +21,10 @@
 # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 # SOFTWARE.
+"""
+    This module is the main entry point for kas, setup tool for bitbake based
+    projects
+"""
 
 import argparse
 import traceback
@@ -31,9 +35,9 @@ import pkg_resources
 
 try:
     import colorlog
-    have_colorlog = True
+    HAVE_COLORLOG = True
 except ImportError:
-    have_colorlog = False
+    HAVE_COLORLOG = False
 
 from .build import Build
 from .shell import Shell
@@ -44,27 +48,34 @@ __copyright__ = 'Copyright (c) Siemens AG, 2017'
 
 
 def create_logger():
+    """
+        Setup the logging environment
+    """
     log = logging.getLogger()  # root logger
     log.setLevel(logging.INFO)
-    format = '%(asctime)s - %(levelname)-8s - %(message)s'
+    format_str = '%(asctime)s - %(levelname)-8s - %(message)s'
     date_format = '%Y-%m-%d %H:%M:%S'
-    if have_colorlog and os.isatty(2):
-        cformat = '%(log_color)s' + format
+    if HAVE_COLORLOG and os.isatty(2):
+        cformat = '%(log_color)s' + format_str
         colors = {'DEBUG': 'reset',
                   'INFO': 'reset',
                   'WARNING': 'bold_yellow',
                   'ERROR': 'bold_red',
                   'CRITICAL': 'bold_red'}
-        f = colorlog.ColoredFormatter(cformat, date_format, log_colors=colors)
+        formatter = colorlog.ColoredFormatter(cformat, date_format,
+                                              log_colors=colors)
     else:
-        f = logging.Formatter(format, date_format)
-    ch = logging.StreamHandler()
-    ch.setFormatter(f)
-    log.addHandler(ch)
+        formatter = logging.Formatter(format_str, date_format)
+    stream_handler = logging.StreamHandler()
+    stream_handler.setFormatter(formatter)
+    log.addHandler(stream_handler)
     return logging.getLogger(__name__)
 
 
 def kas(argv):
+    """
+        The main entry point of kas.
+    """
     create_logger()
 
     parser = argparse.ArgumentParser(description='Steer ebs-yocto builds')
@@ -96,10 +107,15 @@ def kas(argv):
 
 
 def main():
+    """
+        The main function that operates as a wrapper around kas.
+    """
+    # pylint: disable=broad-except
+
     try:
         sys.exit(kas(sys.argv[1:]))
     except Exception as err:
-        logging.error('%s' % err)
+        logging.error('%s', err)
         traceback.print_exc()
         sys.exit(1)
 

kas/libcmds.py

@@ -19,12 +19,14 @@
 # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 # SOFTWARE.
+"""
+    This module contain common commands used by kas plugins.
+"""
 
 import tempfile
 import logging
 import shutil
 import os
-from urllib.parse import urlparse
 from .libkas import (ssh_cleanup_agent, ssh_setup_agent, ssh_no_host_key_check,
                      run_cmd, get_oe_environ)
 
@@ -33,41 +35,63 @@ __copyright__ = 'Copyright (c) Siemens AG, 2017'
 
 
 class Macro:
+    """
+        Contains commands and provide method to run them.
+    """
     def __init__(self):
         self.commands = []
 
     def add(self, command):
+        """
+            Appends commands to the command list.
+        """
         self.commands.append(command)
 
-    def run(self, config, skip=[]):
-        for c in self.commands:
-            name = str(c)
-            if name in skip:
+    def run(self, config, skip=None):
+        """
+            Runs command from the command list respective to the configuration.
+        """
+        skip = skip or []
+        for command in self.commands:
+            command_name = str(command)
+            if command_name in skip:
                 continue
-            pre = config.pre_hook(name)
-            if pre:
-                logging.debug('execute ' + pre)
-                pre(config)
-            cmd = config.get_hook(name)
-            if cmd:
-                logging.debug('execute ' + cmd)
-                cmd(config)
+            pre_hook = config.pre_hook(command_name)
+            if pre_hook:
+                logging.debug('execute %s', pre_hook)
+                pre_hook(config)
+            command_hook = config.get_hook(command_name)
+            if command_hook:
+                logging.debug('execute %s', command_hook)
+                command_hook(config)
             else:
-                logging.debug('execute ' + str(c))
-                c.execute(config)
-            post = config.post_hook(name)
-            if post:
-                logging.debug('execute ' + post)
-                post(config)
+                logging.debug('execute %s', command_name)
+                command.execute(config)
+            post_hook = config.post_hook(command_name)
+            if post_hook:
+                logging.debug('execute %s', post_hook)
+                post_hook(config)
 
 
 class Command:
+    """
+        An abstract class that defines the interface of a command.
+    """
+
     def execute(self, config):
+        """
+            This method executes the command.
+        """
         pass
 
 
 class SetupHome(Command):
+    """
+        Setups the home directory of kas.
+    """
+
     def __init__(self):
+        super().__init__()
         self.tmpdirname = tempfile.mkdtemp()
 
     def __del__(self):
@@ -77,14 +101,18 @@ class SetupHome(Command):
         return 'setup_home'
 
     def execute(self, config):
-        with open(self.tmpdirname + '/.wgetrc', 'w') as f:
-            f.write('\n')
-        with open(self.tmpdirname + '/.netrc', 'w') as f:
-            f.write('\n')
+        with open(self.tmpdirname + '/.wgetrc', 'w') as fds:
+            fds.write('\n')
+        with open(self.tmpdirname + '/.netrc', 'w') as fds:
+            fds.write('\n')
         config.environ['HOME'] = self.tmpdirname
 
 
 class SetupDir(Command):
+    """
+        Creates the build directory.
+    """
+
     def __str__(self):
         return 'setup_dir'
 
@@ -95,6 +123,10 @@ class SetupDir(Command):
 
 
 class SetupSSHAgent(Command):
+    """
+        Setup the ssh agent configuration.
+    """
+
     def __str__(self):
         return 'setup_ssh_agent'
 
@@ -104,7 +136,9 @@ class SetupSSHAgent(Command):
 
 
 class CleanupSSHAgent(Command):
-    """Remove all the identities and stop the ssh-agent instance"""
+    """
+        Remove all the identities and stop the ssh-agent instance.
+    """
 
     def __str__(self):
         return 'cleanup_ssh_agent'
@@ -114,6 +148,10 @@ class CleanupSSHAgent(Command):
 
 
 class SetupProxy(Command):
+    """
+        Setups proxy configuration in the kas environment.
+    """
+
     def __str__(self):
         return 'setup_proxy'
 
@@ -122,6 +160,10 @@ class SetupProxy(Command):
 
 
 class SetupEnviron(Command):
+    """
+        Setups the kas environment.
+    """
+
     def __str__(self):
         return 'setup_environ'
 
@@ -130,34 +172,39 @@ class SetupEnviron(Command):
 
 
 class WriteConfig(Command):
+    """
+        Writes bitbake configuration files into the build directory.
+    """
+
     def __str__(self):
         return 'write_config'
 
     def execute(self, config):
-        self._write_bblayers_conf(config)
-        self._write_local_conf(config)
+        def _write_bblayers_conf(config):
+            filename = config.build_dir + '/conf/bblayers.conf'
+            with open(filename, 'w') as fds:
+                fds.write(config.get_bblayers_conf_header())
+                fds.write('BBLAYERS ?= " \\\n')
+                for repo in config.get_repos():
+                    fds.write(' \\\n'.join(repo.layers + ['']))
+                fds.write('"\n')
 
-    def _append_layers(self, config, file):
-        for repo in config.get_repos():
-            file.write(' \\\n'.join(repo.layers + ['']))
+        def _write_local_conf(config):
+            filename = config.build_dir + '/conf/local.conf'
+            with open(filename, 'w') as fds:
+                fds.write(config.get_local_conf_header())
+                fds.write('MACHINE ?= "{}"\n'.format(config.get_machine()))
+                fds.write('DISTRO ?= "{}"\n'.format(config.get_distro()))
 
-    def _write_bblayers_conf(self, config):
-        filename = config.build_dir + '/conf/bblayers.conf'
-        with open(filename, 'w') as file:
-            file.write(config.get_bblayers_conf_header())
-            file.write('BBLAYERS ?= " \\\n')
-            self._append_layers(config, file)
-            file.write('"\n')
-
-    def _write_local_conf(self, config):
-        filename = config.build_dir + '/conf/local.conf'
-        with open(filename, 'w') as file:
-            file.write(config.get_local_conf_header())
-            file.write('MACHINE ?= "{}"\n'.format(config.get_machine()))
-            file.write('DISTRO ?= "{}"\n'.format(config.get_distro()))
+        _write_bblayers_conf(config)
+        _write_local_conf(config)
 
 
 class ReposFetch(Command):
+    """
+        Fetches repositories defined in the configuration
+    """
+
     def __str__(self):
         return 'repos_fetch'
 
@@ -170,8 +217,7 @@ class ReposFetch(Command):
                 os.makedirs(os.path.dirname(repo.path), exist_ok=True)
                 gitsrcdir = os.path.join(config.get_repo_ref_dir() or '',
                                          repo.qualified_name)
-                logging.debug('Looking for repo ref dir in {}'.
-                              format(gitsrcdir))
+                logging.debug('Looking for repo ref dir in %s', gitsrcdir)
                 if config.get_repo_ref_dir() and os.path.exists(gitsrcdir):
                     run_cmd(['/usr/bin/git',
                              'clone',
@@ -187,22 +233,26 @@ class ReposFetch(Command):
                 continue
 
             # Does refspec in the current repository?
-            (rc, output) = run_cmd(['/usr/bin/git', 'cat-file',
-                                    '-t', repo.refspec], env=config.environ,
-                                   cwd=repo.path, fail=False)
-            if rc == 0:
+            (retc, output) = run_cmd(['/usr/bin/git', 'cat-file',
+                                      '-t', repo.refspec], env=config.environ,
+                                     cwd=repo.path, fail=False)
+            if retc == 0:
                 continue
 
             # No it is missing, try to fetch
-            (rc, output) = run_cmd(['/usr/bin/git', 'fetch', '--all'],
-                                   env=config.environ,
-                                   cwd=repo.path, fail=False)
-            if rc:
-                logging.warning('Could not update repository {}: {}'.
-                                format(repo.name, output))
+            (retc, output) = run_cmd(['/usr/bin/git', 'fetch', '--all'],
+                                     env=config.environ,
+                                     cwd=repo.path, fail=False)
+            if retc:
+                logging.warning('Could not update repository %s: %s',
+                                repo.name, output)
 
 
 class ReposCheckout(Command):
+    """
+        Ensures that the right revision of each repo is check out.
+    """
+
     def __str__(self):
         return 'repos_checkout'
 
@@ -212,22 +262,21 @@ class ReposCheckout(Command):
                 continue
 
             # Check if repos is dirty
-            (rc, output) = run_cmd(['/usr/bin/git', 'diff', '--shortstat'],
-                                   env=config.environ, cwd=repo.path,
-                                   fail=False)
+            (_, output) = run_cmd(['/usr/bin/git', 'diff', '--shortstat'],
+                                  env=config.environ, cwd=repo.path,
+                                  fail=False)
             if len(output):
-                logging.warning('Repo {} is dirty. no checkout'.
-                                format(repo.name))
+                logging.warning('Repo %s is dirty. no checkout', repo.name)
                 continue
 
             # Check if current HEAD is what in the config file is defined.
-            (rc, output) = run_cmd(['/usr/bin/git', 'rev-parse',
-                                    '--verify', 'HEAD'], env=config.environ,
-                                   cwd=repo.path)
+            (_, output) = run_cmd(['/usr/bin/git', 'rev-parse',
+                                   '--verify', 'HEAD'],
+                                  env=config.environ, cwd=repo.path)
 
             if output.strip() == repo.refspec:
-                logging.info(('Repo {} has already checkout out correct '
-                              'refspec. nothing to do').format(repo.name))
+                logging.info('Repo %s has already checkout out correct '
+                             'refspec. nothing to do', repo.name)
                 continue
 
             run_cmd(['/usr/bin/git', 'checkout', '-q',

kas/libkas.py

@@ -19,6 +19,9 @@
 # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 # SOFTWARE.
+"""
+    This module contains the core implementation of kas.
+"""
 
 import re
 import os
@@ -33,38 +36,58 @@ __copyright__ = 'Copyright (c) Siemens AG, 2017'
 
 
 class LogOutput:
+    """
+        Handles the log output of executed applications
+    """
     def __init__(self, live):
         self.live = live
         self.stdout = []
         self.stderr = []
 
     def log_stdout(self, line):
+        """
+            This method is called when a line over stdout is received.
+        """
         if self.live:
             logging.info(line.strip())
         self.stdout.append(line)
 
     def log_stderr(self, line):
+        """
+            This method is called when a line over stderr is received.
+        """
         if self.live:
             logging.error(line.strip())
         self.stderr.append(line)
 
 
 @asyncio.coroutine
-def _read_stream(stream, cb):
+def _read_stream(stream, callback):
+    """
+        This asynchronious method reads from the output stream of the
+        application and transfers each line to the callback function.
+    """
     while True:
         line = yield from stream.readline()
         try:
             line = line.decode('utf-8')
-        except:
-            logging.warning('Could not decode line from stream - ignore it')
+        except UnicodeDecodeError as err:
+            logging.warning('Could not decode line from stream, ignore it: %s',
+                            err)
         if line:
-            cb(line)
+            callback(line)
         else:
             break
 
 
 @asyncio.coroutine
 def _stream_subprocess(cmd, cwd, env, shell, stdout_cb, stderr_cb):
+    """
+        This function starts the subprocess, sets up the output stream
+        handlers and waits until the process has existed
+    """
+    # pylint: disable=too-many-arguments
+
     if shell:
         process = yield from asyncio.create_subprocess_shell(
             cmd,
@@ -89,14 +112,18 @@ def _stream_subprocess(cmd, cwd, env, shell, stdout_cb, stderr_cb):
     return ret
 
 
-def run_cmd(cmd, cwd, env={}, fail=True, shell=False, liveupdate=True):
-    rc = 0
-    stdout = []
-    stderr = []
+def run_cmd(cmd, cwd, env=None, fail=True, shell=False, liveupdate=True):
+    """
+        Starts a command.
+    """
+    # pylint: disable=too-many-arguments
+
+    env = env or {}
+    retc = 0
     cmdstr = cmd
     if not shell:
         cmdstr = ' '.join(cmd)
-    logging.info('{}$ {}'.format(cwd, cmdstr))
+    logging.info('%s$ %s', cwd, cmdstr)
 
     logo = LogOutput(liveupdate)
     if asyncio.get_event_loop().is_closed():
@@ -105,22 +132,25 @@ def run_cmd(cmd, cwd, env={}, fail=True, shell=False, liveupdate=True):
     else:
         loop = asyncio.get_event_loop()
 
-    rc = loop.run_until_complete(
+    retc = loop.run_until_complete(
         _stream_subprocess(cmd, cwd, env, shell,
                            logo.log_stdout, logo.log_stderr))
     loop.close()
 
-    if rc and fail:
+    if retc and fail:
         msg = 'Command "{cwd}$ {cmd}" failed\n'.format(cwd=cwd, cmd=cmdstr)
         for line in logo.stderr:
             msg += line
         logging.error(msg)
-        sys.exit(rc)
+        sys.exit(retc)
 
-    return (rc, ''.join(logo.stdout))
+    return (retc, ''.join(logo.stdout))
 
 
 def find_program(paths, name):
+    """
+        Find a file within the paths array and returns its path.
+    """
     for path in paths.split(os.pathsep):
         prg = os.path.join(path, name)
         if os.path.isfile(prg):
@@ -129,6 +159,10 @@ def find_program(paths, name):
 
 
 def get_oe_environ(config, build_dir):
+    """
+        Create the openembedded environment variables.
+    """
+    # pylint: disable=too-many-locals
     # nasty side effect function: running oe-init-build-env also
     # creates the conf directory
 
@@ -142,19 +176,19 @@ def get_oe_environ(config, build_dir):
         sys.exit(1)
 
     get_bb_env_file = tempfile.mktemp()
-    with open(get_bb_env_file, 'w') as f:
+    with open(get_bb_env_file, 'w') as fds:
         script = """#!/bin/bash
         source oe-init-build-env $1 > /dev/null 2>&1
         env
         """
-        f.write(script)
+        fds.write(script)
     os.chmod(get_bb_env_file, 0o775)
 
     env = {}
     env['PATH'] = '/bin:/usr/bin'
 
-    (rc, output) = run_cmd([get_bb_env_file, build_dir],
-                           cwd=oe_path, env=env, liveupdate=False)
+    (_, output) = run_cmd([get_bb_env_file, build_dir],
+                          cwd=oe_path, env=env, liveupdate=False)
 
     os.remove(get_bb_env_file)
 
@@ -163,65 +197,77 @@ def get_oe_environ(config, build_dir):
         try:
             (key, val) = line.split('=', 1)
             env[key] = val
-        except:
+        except ValueError:
             pass
 
-    vars = ['SSTATE_DIR', 'DL_DIR', 'TMPDIR']
+    env_vars = ['SSTATE_DIR', 'DL_DIR', 'TMPDIR']
     if 'BB_ENV_EXTRAWHITE' in env:
-        ew = env['BB_ENV_EXTRAWHITE'] + ' '.join(vars)
-        env.update({'BB_ENV_EXTRAWHITE': ew})
+        extra_white = env['BB_ENV_EXTRAWHITE'] + ' '.join(env_vars)
+        env.update({'BB_ENV_EXTRAWHITE': extra_white})
 
-    vars.extend(['SSH_AGENT_PID', 'SSH_AUTH_SOCK',
-                 'SHELL', 'TERM'])
+    env_vars.extend(['SSH_AGENT_PID', 'SSH_AUTH_SOCK',
+                     'SHELL', 'TERM'])
 
-    for v in vars:
-        if v in os.environ:
-            env[v] = os.environ[v]
+    for env_var in env_vars:
+        if env_var in os.environ:
+            env[env_var] = os.environ[env_var]
 
     return env
 
 
 def ssh_add_key(env, key):
-    p = Popen(['/usr/bin/ssh-add', '-'], stdin=PIPE, stdout=None,
-              stderr=PIPE, env=env)
-    error = p.communicate(input=str.encode(key))[1]
-    if p.returncode and error:
-        logging.error('failed to add ssh key: {}'.format(error))
+    """
+        Add ssh key to the ssh-agent
+    """
+    process = Popen(['/usr/bin/ssh-add', '-'], stdin=PIPE, stdout=None,
+                    stderr=PIPE, env=env)
+    (_, error) = process.communicate(input=str.encode(key))
+    if process.returncode and error:
+        logging.error('failed to add ssh key: %s', error)
 
 
 def ssh_cleanup_agent(config):
-    """Removes the identities and stop the ssh-agent instance """
+    """
+        Removes the identities and stop the ssh-agent instance
+    """
     # remove the identities
-    p = Popen(['/usr/bin/ssh-add', '-D'], env=config.environ)
-    p.wait()
-    if p.returncode != 0:
+    process = Popen(['/usr/bin/ssh-add', '-D'], env=config.environ)
+    process.wait()
+    if process.returncode != 0:
         logging.error('failed to delete SSH identities')
 
     # stop the ssh-agent
-    p = Popen(['/usr/bin/ssh-agent', '-k'], env=config.environ)
-    p.wait()
-    if p.returncode != 0:
+    process = Popen(['/usr/bin/ssh-agent', '-k'], env=config.environ)
+    process.wait()
+    if process.returncode != 0:
         logging.error('failed to stop SSH agent')
 
 
-def ssh_setup_agent(config, envkeys=['SSH_PRIVATE_KEY']):
+def ssh_setup_agent(config, envkeys=None):
+    """
+        Starts the ssh-agent
+    """
+    envkeys = envkeys or ['SSH_PRIVATE_KEY']
     output = os.popen('/usr/bin/ssh-agent -s').readlines()
     for line in output:
-        matches = re.search("(\S+)\=(\S+)\;", line)
+        matches = re.search(r"(\S+)\=(\S+)\;", line)
         if matches:
             config.environ[matches.group(1)] = matches.group(2)
 
-    for ek in envkeys:
-        key = os.environ.get(ek)
+    for envkey in envkeys:
+        key = os.environ.get(envkey)
         if key:
             ssh_add_key(config.environ, key)
         else:
-            logging.warning('{} is missing'.format(ek))
+            logging.warning('%s is missing', envkey)
 
 
-def ssh_no_host_key_check(config):
+def ssh_no_host_key_check(_):
+    """
+        Disables ssh host key check
+    """
     home = os.path.expanduser('~')
     if not os.path.exists(home + '/.ssh'):
         os.mkdir(home + '/.ssh')
-    with open(home + '/.ssh/config', 'w') as f:
-        f.write('Host *\n\tStrictHostKeyChecking no\n\n')
+    with open(home + '/.ssh/config', 'w') as fds:
+        fds.write('Host *\n\tStrictHostKeyChecking no\n\n')

kas/repos.py

@@ -19,6 +19,9 @@
 # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 # SOFTWARE.
+"""
+    This module contains the Repo class.
+"""
 
 import os
 from urllib.parse import urlparse
@@ -28,6 +31,10 @@ __copyright__ = 'Copyright (c) Siemens AG, 2017'
 
 
 class Repo:
+    """
+        Represents a repository in the kas configuration.
+    """
+
     def __init__(self, url, path, refspec=None, sublayers=None):
         self.url = url
         self.path = path
@@ -37,6 +44,9 @@ class Repo:
         self.git_operation_disabled = False
 
     def disable_git_operations(self):
+        """
+            Disabled all git operation for this repository.
+        """
         self.git_operation_disabled = True
 
     def __getattr__(self, item):
@@ -47,11 +57,12 @@ class Repo:
                 return [self.path + '/' + l for l in self.sublayers]
         elif item == 'qualified_name':
             url = urlparse(self.url)
-            return ('{url.netloc}{url.path}'.format(url=url)
-                                            .replace('@', '.')
-                                            .replace(':', '.')
-                                            .replace('/', '.')
-                                            .replace('*', '.'))
+            return ('{url.netloc}{url.path}'
+                    .format(url=url)
+                    .replace('@', '.')
+                    .replace(':', '.')
+                    .replace('/', '.')
+                    .replace('*', '.'))
 
     def __str__(self):
         return '%s:%s %s' % (self.url, self.refspec, self.sublayers)

kas/shell.py

@@ -19,6 +19,10 @@
 # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 # SOFTWARE.
+"""
+    This module contains a kas plugin that opens a shell within the kas
+    environment
+"""
 
 import subprocess
 from kas.config import load_config
@@ -29,6 +33,10 @@ __copyright__ = 'Copyright (c) Siemens AG, 2017'
 
 
 class Shell:
+    """
+        Implements a kas plugin that opens a shell within the kas environment.
+    """
+
     def __init__(self, parser):
         sh_prs = parser.add_parser('shell')
 
@@ -45,6 +53,11 @@ class Shell:
                             default='')
 
     def run(self, args):
+        """
+            Runs this kas plugin
+        """
+        # pylint: disable= no-self-use
+
         if args.cmd != 'shell':
             return False
 
@@ -63,8 +76,12 @@ class Shell:
 
 
 class ShellCommand(Command):
+    """
+        This class implements the command that starts a shell.
+    """
+
     def __init__(self, cmd):
-        Command.__init__(self)
+        super().__init__()
         self.cmd = []
         if cmd:
             self.cmd = cmd

setup.py

@@ -19,18 +19,21 @@
 # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 # SOFTWARE.
+"""
+    Setup script for kas, a setup tool for bitbake based projects
+"""
 
-from setuptools import setup, find_packages
 from os import path
+from setuptools import setup, find_packages
 
 from kas import __version__
 
 __license__ = 'MIT'
 __copyright__ = 'Copyright (c) Siemens AG, 2017'
 
-here = path.abspath(path.dirname(__file__))
-with open(path.join(here, 'README.md')) as f:
-    long_description = f.read()
+HERE = path.abspath(path.dirname(__file__))
+with open(path.join(HERE, 'README.md')) as f:
+    LONG_DESCRIPTION = f.read()
 
 
 setup(
@@ -38,7 +41,7 @@ setup(
     version=__version__,
 
     description='Setup tool for bitbake based projects',
-    long_description=long_description,
+    long_description=LONG_DESCRIPTION,
 
     license='MIT',