Module import style checking changes

* Implementing the * import detection (it is disabled for now)
* New style relative import testing based on syntax rules
* Old style relative import testing based on module search
* Inspection based solution replaced by PYTHONPATH search
  in order to avoid module compile and initialization steps
  (code execution) in a syntax checking phase.

This solution is faster and safer, but does not able to recognize
modules added dynamically to the module scope.

Change-Id: Ifc871f4fdbcd4a9a736170ceb4475f4f2cbe66bc

HACKING.rst

@@ -52,6 +52,7 @@ Imports
 -------
 - Do not import objects, only modules (*)
 - Do not import more than one module per line (*)
+- Do not use wildcard ``*`` import (*)
 - Do not make relative imports
 - Do not make new nova.db imports in nova/virt/*
 - Order your imports by the full module path
@@ -62,6 +63,8 @@ Imports
 - imports from ``migrate`` package
 - imports from ``sqlalchemy`` package
 - imports from ``nova.db.sqlalchemy.session`` module
+- imports from ``nova.openstack.common.log.logging`` package
+- imports from ``nova.db.sqlalchemy.migration.versioning_api`` package
 
 Example::
 

run_tests.sh

@@ -93,6 +93,8 @@ export venv_name
 export tools_dir
 export venv=${venv_path}/${venv_dir}
 
+SCRIPT_ROOT=$(dirname $(readlink -f "$0"))
+
 if [ $no_site_packages -eq 1 ]; then
   installvenvopts="--no-site-packages"
 fi
@@ -156,12 +158,11 @@ function run_pep8 {
   srcfiles=`find nova -type f -name "*.py" ! -wholename "nova\/openstack*"`
   srcfiles+=" `find bin -type f ! -name "nova.conf*" ! -name "*api-paste.ini*" ! -name "*~"`"
   srcfiles+=" `find tools -type f -name "*.py"`"
-  srcfiles+=" `find plugins -type f -name "*.py"`"
   srcfiles+=" `find smoketests -type f -name "*.py"`"
   srcfiles+=" setup.py"
 
   # Until all these issues get fixed, ignore.
-  ignore='--ignore=E12,E711,E721,E712,N403,N404'
+  ignore='--ignore=E12,E711,E721,E712,N403,N404,N303'
 
   # First run the hacking selftest, to make sure it's right
   echo "Running hacking.py self test"
@@ -171,6 +172,10 @@ function run_pep8 {
   echo "Running pep8"
   ${wrapper} python tools/hacking.py ${ignore} ${srcfiles}
 
+  PYTHONPATH=$SCRIPT_ROOT/plugins/xenserver/networking/etc/xensource/scripts ${wrapper} python tools/hacking.py ${ignore} ./plugins/xenserver/networking
+
+  PYTHONPATH=$SCRIPT_ROOT/plugins/xenserver/xenapi/etc/xapi.d/plugins ${wrapper} python tools/hacking.py ${ignore} ./plugins/xenserver/xenapi
+
   ${wrapper} bash tools/unused_imports.sh
   # NOTE(sdague): as of grizzly-2 these are passing however leaving the comment
   # in here in case we need to break it out when we get more of our hacking working

tox.ini

@@ -20,10 +20,15 @@ deps=
   pyflakes
 commands =
   python tools/hacking.py --doctest
-  python tools/hacking.py --ignore=E12,E711,E721,E712,N403,N404 --show-source \
-    --exclude=.venv,.git,.tox,dist,doc,*openstack/common*,*lib/python*,*egg,build .
-  python tools/hacking.py --ignore=E12,E711,E721,E712,N403,N404 --show-source \
-    --filename=nova* bin
+  python tools/hacking.py --ignore=E12,E711,E721,E712,N403,N404,N303 \
+    --show-source \
+    --exclude=.venv,.git,.tox,dist,doc,*openstack/common*,*lib/python*,*egg,build,./plugins/xenserver/networking/etc/xensource/scripts,./plugins/xenserver/xenapi/etc/xapi.d/plugins .
+  python tools/hacking.py --ignore=E12,E711,E721,E712,N403,N404,N303,N304 \
+    --show-source \
+    ./plugins/xenserver/networking/etc/xensource/scripts \
+    ./plugins/xenserver/xenapi/etc/xapi.d/plugins
+  python tools/hacking.py --ignore=E12,E711,E721,E712,N403,N404,N303 \
+    --show-source --filename=nova* bin
   bash tools/unused_imports.sh
 
 [testenv:pylint]