libvirt: automatic fallback to qemu

molecule_vagrant/modules/vagrant.py

@@ -285,7 +285,14 @@
       {% endif %}
       {% endif %}
       {% if instance.provider == 'libvirt' %}
+        {% if no_kvm is sameas true and 'driver' not in instance.provider_options %}
+      libvirt.driver='qemu'
+        {% endif %}
+        {% set libvirt_use_qemu = no_kvm %}
         {% if 'driver' in instance.provider_options and 'qemu' in instance.provider_options['driver'] %}
+          {% set libvirt_use_qemu = true %}
+        {% endif %}
+        {% if libvirt_use_qemu is sameas true %}
           {% if 'cpu_mode' not in instance.provider_options %}
       # When using qemu instead of kvm, some libvirt systems
       # will use EPYC as vCPU model inside the new VM.
@@ -543,6 +550,7 @@ def _write_vagrantfile(self):
             VAGRANTFILE_TEMPLATE,
             instances=instances,
             cachier=self.cachier,
+            no_kvm=not os.path.exists("/dev/kvm"),
         )
         molecule.util.write_file(self._vagrantfile, template)
 

molecule_vagrant/test/functional/test_func.py

@@ -21,6 +21,7 @@
 
 import pytest
 import os
+import vagrant
 
 from molecule import util
 from molecule import logger
@@ -53,10 +54,10 @@ def test_command_init_scenario(temp_dir):
         env = os.environ
         if "TESTBOX" in env:
             conf["platforms"][0]["box"] = env["TESTBOX"]
-        if not os.path.exists("/dev/kvm"):
+        if "vagrant-libvirt" in list(
+            map(lambda x: x.name, vagrant.Vagrant().plugin_list())
+        ):
             conf["driver"]["provider"] = {"name": "libvirt"}
-            for p in conf["platforms"]:
-                p["provider_options"] = {"driver": '"qemu"'}
         util.write_file(confpath, util.safe_dump(conf))
 
         cmd = ["molecule", "--debug", "test", "-s", "test-scenario"]
@@ -77,10 +78,6 @@ def test_command_init_scenario(temp_dir):
 )
 def test_vagrant_root(temp_dir, scenario):
 
-    env = os.environ
-    if not os.path.exists("/dev/kvm"):
-        env.update({"VIRT_DRIVER": "'qemu'"})
-
     scenario_directory = os.path.join(
         os.path.dirname(util.abs_path(__file__)), os.path.pardir, "scenarios"
     )
@@ -93,10 +90,6 @@ def test_vagrant_root(temp_dir, scenario):
 
 def test_multi_node(temp_dir):
 
-    env = os.environ
-    if not os.path.exists("/dev/kvm"):
-        env.update({"VIRT_DRIVER": "'qemu'"})
-
     scenario_directory = os.path.join(
         os.path.dirname(util.abs_path(__file__)), os.path.pardir, "scenarios"
     )

molecule_vagrant/test/scenarios/molecule/config_options/molecule.yml

@@ -9,8 +9,6 @@ platforms:
   - name: instance
     config_options:
       synced_folder: true
-    provider_options:
-      driver: ${VIRT_DRIVER:-kvm}
     box: ${TESTBOX:-centos/7}
     instance_raw_config_args:
       - 'vm.synced_folder ".", "/vagrant", type: "rsync"'

molecule_vagrant/test/scenarios/molecule/multi-node/molecule.yml

@@ -17,7 +17,6 @@ platforms:
     memory: 256
     cpus: 1
     provider_options:
-      driver: ${VIRT_DRIVER:-kvm}
       # using session with network leads to troubles
       qemu_use_session: false
     config_options:
@@ -35,7 +34,6 @@ platforms:
     memory: 256
     cpus: 2
     provider_options:
-      driver: ${VIRT_DRIVER:-kvm}
       # using session with network leads to troubles
       qemu_use_session: false
     instance_raw_config_args:

molecule_vagrant/test/scenarios/molecule/network/molecule.yml

@@ -9,7 +9,6 @@ platforms:
   - name: instance
     box: ${TESTBOX:-centos/7}
     provider_options:
-      driver: ${VIRT_DRIVER:-kvm}
       # using session with network leads to troubles
       qemu_use_session: false
     interfaces:

molecule_vagrant/test/scenarios/molecule/provider_config_options/molecule.yml

@@ -9,7 +9,6 @@ platforms:
   - name: instance
     provider_options:
       nic_model_type: e1000
-      driver: ${VIRT_DRIVER:-kvm}
     box: ${TESTBOX:-centos/7}
 provisioner:
   name: ansible

molecule_vagrant/test/scenarios/molecule/vagrant_root/molecule.yml

@@ -9,8 +9,6 @@ driver:
 platforms:
   - name: instance
     box: ${TESTBOX:-centos/7}
-    provider_options:
-      driver: ${VIRT_DRIVER:-kvm}
     instance_raw_config_args:
       - "vm.provision :shell, inline: \"echo #{Dir.pwd} > /tmp/workdir\""
 provisioner: