pylint fixes

a.) appease pylint on raring, as it doesn't like subprocess
    pylint: 0.26.0-1ubuntu1
    This is mentioned in comments at http://www.logilab.org/ticket/46273

b.) tests/unittests/test_util.py:
    the mountinfo lines are longer than 80 chars.
    Just disable long lines complaints for this file.

cloudinit/config/cc_power_state_change.py

@@ -100,7 +100,7 @@ def execmd(exe_args, output=None, data_in=None):
         proc = subprocess.Popen(exe_args, stdin=subprocess.PIPE,
                                 stdout=output, stderr=subprocess.STDOUT)
         proc.communicate(data_in)
-        ret = proc.returncode
+        ret = proc.returncode  # pylint: disable=E1101
     except Exception:
         doexit(EXIT_FAIL)
     doexit(ret)

cloudinit/util.py

@@ -462,7 +462,7 @@ def redirect_output(outfmt, errfmt, o_out=None, o_err=None):
             new_fp = open(arg, owith)
         elif mode == "|":
             proc = subprocess.Popen(arg, shell=True, stdin=subprocess.PIPE)
-            new_fp = proc.stdin
+            new_fp = proc.stdin  # pylint: disable=E1101
         else:
             raise TypeError("Invalid type for output format: %s" % outfmt)
 
@@ -484,7 +484,7 @@ def redirect_output(outfmt, errfmt, o_out=None, o_err=None):
             new_fp = open(arg, owith)
         elif mode == "|":
             proc = subprocess.Popen(arg, shell=True, stdin=subprocess.PIPE)
-            new_fp = proc.stdin
+            new_fp = proc.stdin  # pylint: disable=E1101
         else:
             raise TypeError("Invalid type for error format: %s" % errfmt)
 
@@ -1409,7 +1409,7 @@ def subp(args, data=None, rcs=None, env=None, capture=True, shell=False,
         (out, err) = sp.communicate(data)
     except OSError as e:
         raise ProcessExecutionError(cmd=args, reason=e)
-    rc = sp.returncode
+    rc = sp.returncode  # pylint: disable=E1101
     if rc not in rcs:
         raise ProcessExecutionError(stdout=out, stderr=err,
                                     exit_code=rc,

setup.py

@@ -61,9 +61,10 @@ def tiny_p(cmd, capture=True):
     sp = subprocess.Popen(cmd, stdout=stdout,
                     stderr=stderr, stdin=None)
     (out, err) = sp.communicate()
-    if sp.returncode not in [0]:
+    ret = sp.returncode  # pylint: disable=E1101
+    if ret not in [0]:
         raise RuntimeError("Failed running %s [rc=%s] (%s, %s)" 
-                            % (cmd, sp.returncode, out, err))
+                            % (cmd, ret, out, err))
     return (out, err)
 
 

tests/unittests/test_util.py

@@ -1,3 +1,5 @@
+# pylint: disable=C0301
+# the mountinfo data lines are too long
 import os
 import stat
 import yaml