$ git clone -n https://src.fedoraproject.org/rpms/golang-github-lestrrat-backoff-2.git /var/lib/mock/f39-build-1510275-35487/root/chroot_tmpdir/scmroot/golang-github-lestrrat-backoff-2
Cloning into '/var/lib/mock/f39-build-1510275-35487/root/chroot_tmpdir/scmroot/golang-github-lestrrat-backoff-2'...
$ git fetch origin 90a42cbf609274e75413a6d363b07d0e15642eb6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-lestrrat-backoff-2
 * [new ref]         90a42cbf609274e75413a6d363b07d0e15642eb6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 90a42cb Disable some tetss