TinyIPA: Precompile python code for faster load

This patch adds code into the tinyipa build process and IPA itself to
allow the required python code to be PYTHONOPTIMIZE precompiled into
pyo files, this speeds up IPA startup time in a nested virt by 50%.

Change-Id: Ib60c420719ea52a602c1752b572d3b217c2cefc7

imagebuild/tinyipa/build_files/bootlocal.sh

@@ -17,5 +17,9 @@ if ! type "ironic-python-agent" > /dev/null ; then
   python /tmp/get-pip.py --no-wheel --no-index --find-links=file:///tmp/wheelhouse ironic_python_agent
 fi
 
+export PYTHONOPTIMIZE=1
+
 # Run IPA
+echo "Starting Ironic Python Agent:"
+date
 ironic-python-agent

imagebuild/tinyipa/finalise-tinyipa.sh

@@ -87,6 +87,14 @@ sudo cp "$WORKDIR/build_files/bootlocal.sh" "$FINALDIR/opt/."
 
 # Disable ZSwap
 sudo sed -i '/# Main/a NOZSWAP=1' "$FINALDIR/etc/init.d/tc-config"
+# sudo cp $WORKDIR/build_files/tc-config $FINALDIR/etc/init.d/tc-config
+
+# Precompile all python
+set +e
+$CHROOT_CMD /bin/bash -c "python -OO -m compileall /usr/local/lib/python2.7"
+set -e
+find $FINALDIR/usr/local/lib/python2.7 -name "*.py" -not -path "*ironic_python_agent/api/config.py" | sudo xargs rm
+find $FINALDIR/usr/local/lib/python2.7 -name "*.pyc" | sudo xargs rm
 
 # Allow an extension to be added to the generated files by specifying
 # $BRANCH_PATH e.g. export BRANCH_PATH=master results in tinyipa-master.gz etc

ironic_python_agent/api/app.py

@@ -34,6 +34,7 @@ def get_pecan_config():
     :returns: pecan configuration object.
     """
     filename = config.__file__.replace('.pyc', '.py')
+    filename = filename.replace('.pyo', '.py')
     return pecan.configuration.conf_from_file(filename)