diff --git a/cfg_checker/common/const.py b/cfg_checker/common/const.py
index 1ae2bba..490d879 100644
--- a/cfg_checker/common/const.py
+++ b/cfg_checker/common/const.py
@@ -65,3 +65,23 @@
     "rgw": "storage_rados",
     "unk": "uknown"
 }
+
+ubuntu_releases = ["trusty", "xenial", "ubuntu"]
+all_arch = ["amd64"]
+repo_types = {
+    "main": "Officially supported software",
+    "restricted": "Supported software that is not "
+                  "available under a completely free license",
+    "universe": "Community maintained software, "
+                "i.e. not officially supported software",
+    "multiverse": "Software that is not free",
+    "contrib": "Free software, but is dependent to non-free software",
+    "uknown": "No specific description available"
+}
+
+_repos_info_archive = "repo.info.tgz"
+_repos_versions_archive = "repo.versions.tgz"
+_pkg_desc_archive = "pkg.descriptions.tgz"
+
+_repos_index_filename = "repoindex.json"
+_repos_versions_filename = "versions.json"
diff --git a/cfg_checker/common/file_utils.py b/cfg_checker/common/file_utils.py
index d508121..684fc30 100644
--- a/cfg_checker/common/file_utils.py
+++ b/cfg_checker/common/file_utils.py
@@ -82,3 +82,14 @@
     }
 
     return _dict
+
+
+def get_gzipped_file(url):
+    # imports
+    from io import BytesIO
+    from requests import get
+    import gzip
+    # download a file
+    _bytes = BytesIO(get(url).content)
+    with gzip.GzipFile(fileobj=_bytes) as gz:
+        return gz.read()