Check for oslo library usage

Occasionally oslo library usage sneaks in, so add a coding check
that checks for ^oslo\. in requirements.txt. We currently still
use oslo.test, so don't check test-requirements.txt. This should
fail to pass tests until I34357d5a594330d07f5cad372859d98efb5d3fde
merges.

Change-Id: I53108584ee47a7f1b6c7df90c49f95725cec69f9

HACKING.rst

@@ -1,4 +1,14 @@
 ovsdbapp Style Commandments
-===============================================
+===========================
 
-Read the OpenStack Style Commandments https://docs.openstack.org/hacking/latest/
+- Step 1: Read the OpenStack Style Commandments
+  https://docs.openstack.org/hacking/latest/
+
+- Step 2: Read on
+
+ovsdbapp-specific Commandments
+------------------------------
+
+- ovsdbapp is intended to be a simple wrapper on top of python-ovs. As such,
+  it must build and be deployable without any OpenStack dependencies (oslo
+  projects included). It does currently use oslo.test for testing.

tools/coding-checks.sh

@@ -27,12 +27,22 @@ process_options () {
         case $opt in
             -h|--help) usage;;
             -Y|--pylint) pylint=1;;
+            -O|--oslo) oslo=1;;
+            -a|--all) oslo=1; pylint=1;;
             *) join_args;;
         esac
         i=$((i+1))
     done
 }
 
+run_oslo () {
+    echo "Checking for oslo libraries in requirements.txt..."
+    if grep -q "^oslo[.-]" requirements.txt; then
+        echo "oslo libraries are not allowed"
+        exit 1
+    fi
+}
+
 run_pylint () {
     local target="${scriptargs:-all}"
 
@@ -56,10 +66,14 @@ run_pylint () {
 }
 
 scriptargs=
-pylint=1
+pylint=0
+oslo=0
 
 process_options $@
 
+if [ $oslo -eq 1 ]; then
+    run_oslo
+fi
 if [ $pylint -eq 1 ]; then
     run_pylint
     exit 0

tox.ini

@@ -19,7 +19,7 @@ commands = stestr run --slowest {posargs}
 [testenv:pep8]
 basepython = python2.7
 commands = flake8
-           {toxinidir}/tools/coding-checks.sh --pylint '{posargs}'
+           {toxinidir}/tools/coding-checks.sh --all '{posargs}'
 
 [testenv:venv]
 commands = {posargs}