Migrate to flake8.

Fixes bug 1172444.

Change-Id: Ia063ec67de9e6061ce38b948c9eb60b5589c7bb4

run_tests.sh

@@ -117,26 +117,8 @@ function copy_subunit_log {
 }
 
 function run_pep8 {
-  echo "Running pep8 ..."
-  srcfiles="cinderclient tests"
-  # Just run PEP8 in current environment
-  #
-  # NOTE(sirp): W602 (deprecated 3-arg raise) is being ignored for the
-  # following reasons:
-  #
-  #  1. It's needed to preserve traceback information when re-raising
-  #     exceptions; this is needed b/c Eventlet will clear exceptions when
-  #     switching contexts.
-  #
-  #  2. There doesn't appear to be an alternative, "pep8-tool" compatible way of doing this
-  #     in Python 2 (in Python 3 `with_traceback` could be used).
-  #
-  #  3. Can find no corroborating evidence that this is deprecated in Python 2
-  #     other than what the PEP8 tool claims. It is deprecated in Python 3, so,
-  #     perhaps the mistake was thinking that the deprecation applied to Python 2
-  #     as well.
-  pep8_opts="--ignore=E202,W602 --repeat"
-  ${wrapper} pep8 ${pep8_opts} ${srcfiles}
+  echo "Running flake8 ..."
+  ${wrapper} flake8
 }
 
 TESTRTESTS="testr run --parallel $testropts"

tools/test-requires

@@ -1,10 +1,15 @@
 distribute>=0.6.24
 
+# Install bounded pep8/pyflakes first, then let flake8 install
+pep8==1.4.5
+pyflakes==0.7.2
+flake8==2.0
+hacking>=0.5.3,<0.6
+
 coverage
 discover
 fixtures
 mock
-pep8==1.3.3
 sphinx>=1.1.2
 testrepository>=0.0.13
 testtools>=0.9.22

tox.ini

@@ -12,8 +12,7 @@ deps = -r{toxinidir}/tools/pip-requires
 commands = python setup.py testr --testr-args='{posargs}'
 
 [testenv:pep8]
-deps = pep8
-commands = pep8 --repeat --show-source cinderclient setup.py
+commands = flake8
 
 [testenv:venv]
 commands = {posargs}
@@ -23,3 +22,8 @@ commands = python setup.py testr --coverage --testr-args='{posargs}'
 
 [tox:jenkins]
 downloadcache = ~/cache/pip
+
+[flake8]
+show-source = True
+ignore = F,H
+exclude=.venv,.git,.tox,dist,doc,*openstack/common*,*lib/python*,*egg,build,tools