tests/kvm: Forward the test environment variables to the VM

This will help with finding the right libdefault.so and correctly setup
the GLib test framework.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2152>

src/tests/kvm/meson.build

@@ -27,6 +27,12 @@ endif
 
 virtme_run = find_program('virtme-run.sh')
 
+vm_env_entries = []
+foreach name, value: test_env_variables
+  vm_env_entries += ['@0@=@1@'.format(name, value)]
+endforeach
+vm_env = ' '.join(vm_env_entries)
+
 foreach test_case: privileged_tests
   test('kvm-' + test_case['name'], virtme_run,
     suite: ['core', 'mutter/kvm', 'mutter/kvm/' + test_case['suite']],
@@ -34,12 +40,14 @@ foreach test_case: privileged_tests
       kernel_image_target,
     ],
     workdir: mutter_srcdir,
+    env: test_env,
     args: [
       kernel_image_path,
       meta_dbus_runner.full_path(),
       '--kvm',
       test_case['executable'].full_path(),
       meson.current_build_dir(),
+      vm_env,
     ]
   )
 endforeach

src/tests/kvm/virtme-run.sh

@@ -8,6 +8,7 @@ WRAPPER="$2"
 WRAPPER_ARGS="$3"
 TEST_EXECUTABLE="$4"
 TEST_BUILD_DIR="$5"
+VM_ENV="$6"
 
 TEST_RESULT_FILE=$(mktemp -p "$TEST_BUILD_DIR" -t test-result-XXXXXX)
 echo 1 > "$TEST_RESULT_FILE"
@@ -16,6 +17,7 @@ VIRTME_ENV="\
 HOME=$HOME \
 LD_LIBRARY_PATH=$LD_LIBRARY_PATH \
 XDG_DATA_DIRS=$XDG_DATA_DIRS \
+$VM_ENV \
 "
 
 virtme-run \