diff --git a/constants.py b/constants.py
index 957413d..b24ea30 100644
--- a/constants.py
+++ b/constants.py
@@ -37,7 +37,8 @@ REPOSITORIES = [
 ]
 
 DEFAULT_PACKAGE_BRANCH = 'dev'
-KUPFER_HTTPS = 'https://gitlab.com/kupfer/packages/prebuilts/-/raw/%branch%/$arch/$repo'
+KUPFER_HTTPS_BASE = 'https://gitlab.com/kupfer/packages/prebuilts/-/raw/%branch%'
+KUPFER_HTTPS = KUPFER_HTTPS_BASE + '/$arch/$repo'
 
 Arch: TypeAlias = str
 ARCHES = [
@@ -160,5 +161,8 @@ SRCINFO_FILE = '.SRCINFO'
 SRCINFO_METADATA_FILE = '.srcinfo_meta.json'
 SRCINFO_INITIALISED_FILE = ".srcinfo_initialised.json"
 
+SRCINFO_TARBALL_FILE = "srcinfos.tar.gz"
+SRCINFO_TARBALL_URL = f'{KUPFER_HTTPS_BASE}/{SRCINFO_TARBALL_FILE}'
+
 FLAVOUR_INFO_FILE = 'flavourinfo.json'
 FLAVOUR_DESCRIPTION_PREFIX = 'kupfer flavour:'