Make it possible to run Python 3.4 tests optionally

smoke/venv.sh

@@ -8,10 +8,19 @@ VERSION=${VERSION:-3.8}
 PYTHON=${PYTHON:-python$VERSION}
 METHOD=${METHOD:-venv}
 TOX=${TOX:-true}
+INSTALL_OR_SKIP=${INSTALL_OR_SKIP:-false}
 
 # clean from possible older runs
 rm -rf venv .tox __pycache__ .pytest* test_*.py *.pyx *.c *.so ensurepiptestroot || :
 
+if [ "$INSTALL_OR_SKIP" == "true" ] && [ ! -f "/usr/bin/$PYTHON" ]; then
+  dnf -y install "/usr/bin/$PYTHON" || :
+  if [ ! -f "/usr/bin/$PYTHON" ]; then
+    echo "/usr/bin/$PYTHON not installable, skipping this test"
+    exit 0
+  fi
+fi
+
 # check the we can create the venv
 if [ "$METHOD" == "venv" ]; then
   $PYTHON -m venv venv

tests.yml

@@ -34,6 +34,9 @@
     - smoke39:
         dir: smoke
         run: VERSION=3.9 METHOD=venv ./venv.sh
+    - smoke34_optional:
+        dir: smoke
+        run: VERSION=3.4 METHOD=venv INSTALL_OR_SKIP=true ./venv.sh
     - smokepypy:
         dir: smoke
         run: VERSION=2.7 METHOD=virtualenv PYTHON=pypy ./venv.sh
@@ -50,6 +53,7 @@
         dir: flags
         run: python3-debug ./assertflags.py -Og
     required_packages:
+    - dnf
     - gcc
     - virtualenv
     - python2.7