$ git clone -n https://src.fedoraproject.org/rpms/rust-tower-http.git /var/lib/mock/f39-build-1509495-35440/root/chroot_tmpdir/scmroot/rust-tower-http
Cloning into '/var/lib/mock/f39-build-1509495-35440/root/chroot_tmpdir/scmroot/rust-tower-http'...
$ git fetch origin f0d8db654f6821262e2029a8129c175bb8c4747d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-tower-http
 * [new ref]         f0d8db654f6821262e2029a8129c175bb8c4747d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f0d8db6 Update to version 0.4.4; Fixes RHBZ#2236815