$ git clone -n https://src.fedoraproject.org/rpms/buffer.git /var/lib/mock/f41-build-875059-16267/root/chroot_tmpdir/scmroot/buffer
Cloning into '/var/lib/mock/f41-build-875059-16267/root/chroot_tmpdir/scmroot/buffer'...
$ git fetch origin 5ee388736f627496932a70a71933975196591488:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/buffer
 * [new ref]         5ee388736f627496932a70a71933975196591488 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5ee3887 Eliminate use of obsolete %patchN syntax (#2283636)