VT-102: improve spack operation creator

dedal/spack_factory/SpackOperationCreator.py

+import os
+
 from dedal.configuration.SpackConfig import SpackConfig
 from dedal.spack_factory.SpackOperation import SpackOperation
 from dedal.spack_factory.SpackOperationCreateCache import SpackOperationCreateCache
@@ -7,7 +9,16 @@ from dedal.spack_factory.SpackOperationUseCache import SpackOperationUseCache
 class SpackOperationCreator:
     @staticmethod
     def get_spack_operator(spack_config: SpackConfig = None, use_cache: bool = False) -> SpackOperation:
-        if spack_config is None:
+        env_vars = [os.environ.get('CONCRETIZE_OCI_HOST'),
+                    os.environ.get('CONCRETIZE_OCI_PROJECT'),
+                    os.environ.get('CONCRETIZE_OCI_USERNAME'),
+                    os.environ.get('CONCRETIZE_OCI_PASSWORD'),
+                    os.environ.get('BUILDCACHE_OCI_HOST'),
+                    os.environ.get('BUILDCACHE_OCI_PROJECT'),
+                    os.environ.get('BUILDCACHE_OCI_USERNAME'),
+                    os.environ.get('BUILDCACHE_OCI_PASSWORD')
+                    ]
+        if spack_config is None or None in env_vars:
             return SpackOperation()
         elif spack_config.concretization_dir is None and spack_config.buildcache_dir is None:
             return SpackOperation(spack_config)

dedal/tests/integration_tests/spack_operation_creator_test.py

+import os
+
 from dedal.spack_factory.SpackOperationCreateCache import SpackOperationCreateCache
 
 from dedal.configuration.SpackConfig import SpackConfig
@@ -29,6 +31,18 @@ def test_spack_creator_scratch_3():
     spack_operation = SpackOperationCreator.get_spack_operator(spack_config)
     assert isinstance(spack_operation, SpackOperation)
 
+def test_spack_creator_scratch_4(tmp_path):
+    concretize_oci_host = os.environ.get('CONCRETIZE_OCI_HOST')
+    os.environ.pop('CONCRETIZE_OCI_HOST', None)
+    install_dir = tmp_path
+    env = SpackDescriptor('test-spack-env', install_dir, test_spack_env_git)
+    repo = SpackDescriptor('ebrains-spack-builds', install_dir, ebrains_spack_builds_git)
+    spack_config = SpackConfig(env, install_dir=install_dir, concretization_dir=install_dir, buildcache_dir=install_dir)
+    spack_config.add_repo(repo)
+    spack_operation = SpackOperationCreator.get_spack_operator(spack_config)
+    os.environ['CONCRETIZE_OCI_HOST'] = concretize_oci_host
+    assert isinstance(spack_operation, SpackOperation)
+
 
 def test_spack_creator_create_cache(tmp_path):
     install_dir = tmp_path