avoid key length errors with old mysql + jupyterhub 0.7

.travis.yml

@@ -22,15 +22,25 @@ before_install:
   - npm install -g configurable-http-proxy
   - |
     if [[ $JUPYTERHUB_TEST_DB_URL == mysql* ]]; then
+      service stop mysql || echo 'mysql not running'
+      docker run -d -e MYSQL_ALLOW_EMPTY_PASSWORD=1 -p 3306:3306 mysql:5.7
+      echo -n 'waiting for mysql'
+      for i in {1..60}; do
+        if mysql --user root -e '\q' 2>/dev/null; then
+          echo 'done'
+          break
+        else
+          echo -n '.'
+          sleep 1
+        fi
+      done
       mysql -e 'CREATE DATABASE jupyterhub CHARACTER SET utf8 COLLATE utf8_general_ci;'
       mysql -e 'CREATE DATABASE jupyterhub_upgrade CHARACTER SET utf8 COLLATE utf8_general_ci;'
       pip install 'mysql-connector<2.2'
-      ./old-hub-env/bin/python -m pip install 'mysql-connector<2.2'
     elif [[ $JUPYTERHUB_TEST_DB_URL == postgresql* ]]; then
       psql -c 'create database jupyterhub;' -U postgres
       psql -c 'create database jupyterhub_upgrade;' -U postgres
       pip install psycopg2
-      ./old-hub-env/bin/python -m pip install psycopg2
     fi
 install:
   - pip install -U pip

test-db-upgrade/test.sh

@@ -9,7 +9,7 @@ bash "$(dirname $0)"/init-db.sh
 
 # create virtualenv with jupyterhub 0.7
 echo "creating virutalenv in $ENVDIR"
-python -m virtualenv "$ENVDIR"
+python -m venv "$ENVDIR"
 $ENVDIR/bin/pip install -q -r old-requirements.txt
 
 echo "env-jupyterhub: $($ENVDIR/bin/jupyterhub --version)"