Compress test execution logs

The volume of logs we collect in CI jobs are extensive. This
patch ensures that the logs collected are compressed to reduce
the space taken in CI systems.

PYTHONUNBUFFERED is also set to ensure that the console log
from the CI jobs is recorded in the exact order of execution.

Related-Bug: #1620849
Change-Id: I82a3b0b4fd05dba19bf0f44752f15b95bad647a9

bindep.txt

@@ -36,3 +36,6 @@ python-ndg-httpsclient      [platform:ubuntu !platform:ubuntu-trusty]
 python2-pyasn1              [platform:rpm]
 pyOpenSSL                   [platform:rpm]
 python-ndg_httpsclient      [platform:rpm]
+
+# Required for compressing collected log files in CI
+gzip

tox.ini

@@ -27,6 +27,7 @@ whitelist_externals =
     wget
 setenv =
     VIRTUAL_ENV={envdir}
+    PYTHONUNBUFFERED=1
 
 
 [testenv:docs]
@@ -142,7 +143,7 @@ commands =
 
 [testenv:functional]
 # Ignore_errors is set to true so that the logs are collected at the
-#  end of the run. This will not produce a failse positive. Any
+#  end of the run. This will not produce a false positive. Any
 #  exception will be mark the run as failed and exit 1 after all of
 #  the commands have been iterated through.
 ignore_errors = True
@@ -161,9 +162,6 @@ commands =
                      -e "rolename={toxinidir}" \
                      -e "install_test_packages=True" \
                      {toxinidir}/tests/test.yml -vvvv
-    bash -c 'mkdir -p {toxinidir}/logs'
-    bash -c 'rsync -av --ignore-errors /var/log/ /openstack/log/ {toxinidir}/logs/ || true'
-
     # Idempotency test
     bash -c 'ansible-playbook -i {toxinidir}/tests/inventory \
                      -e "rolename={toxinidir}" \
@@ -171,6 +169,10 @@ commands =
                      | grep -q "changed=0.*failed=0" \
                      && (echo "Idempotence test: pass" && exit 0) \
                      || (echo "Idempotence test: fail" && exit 1)'
+    bash -c 'mkdir -p {toxinidir}/logs'
+    bash -c 'rsync --archive --verbose --ignore-errors /var/log/ /openstack/log/ {toxinidir}/logs/ || true'
+    bash -c 'find "{toxinidir}/logs/" -type f | sed "p;s|$|.txt|" | xargs -n2 mv'
+    bash -c 'command gzip --best --recursive "{toxinidir}/logs/"'
 
 
 [testenv:linters]