diff --git a/cvmfs.sh b/cvmfs.sh
new file mode 100644
index 0000000..02627f1
--- /dev/null
+++ b/cvmfs.sh
@@ -0,0 +1,25 @@
+#!/bin/bash
+# requires: createrepo reposync wget curl
+set -e
+set -o pipefail
+
+_here=`dirname $(realpath $0)`
+apt_sync="${_here}/apt-sync.py" 
+yum_sync="${_here}/yum-sync.py"
+
+BASE_PATH="${TUNASYNC_WORKING_DIR}"
+BASE_URL="${TUNASYNC_UPSTREAM_URL:-"https://cvmrepo.s3-website.cern.ch/cvmrepo"}"
+
+APT_PATH="${BASE_PATH}/apt"
+YUM_PATH="${BASE_PATH}/yum"
+export REPO_SIZE_FILE=/tmp/reposize.$RANDOM
+
+# =================== APT repos ===============================
+"$apt_sync" --delete "${BASE_URL}/apt" bionic-prod,bookworm-prod,bullseye-prod,buster-prod,focal-prod,jammy-prod,jessie-prod,noble-prod,precise-prod,stable,stretch-prod,trusty-prod,xenial-prod main i386,amd64 "$APT_PATH"
+echo "APT finished"
+
+# =================== YUM/DNF repos ==========================
+"$yum_sync" "${BASE_URL}/yum/@{comp}/EL/@{os_ver}/@{arch}" 6-9 cvmfs,cvmfs-config,cvmfs-kernel aarch64,i386,ppc64le,x86_64 "@{comp}-EL@{os_ver}-@{arch}" "$YUM_PATH"
+echo "YUM finished"
+
+"${_here}/helpers/size-sum.sh" $REPO_SIZE_FILE --rm