$ git clone -n https://src.fedoraproject.org/rpms/vim.git /var/lib/mock/f40-build-747178-112996/root/chroot_tmpdir/scmroot/vim
Cloning into '/var/lib/mock/f40-build-747178-112996/root/chroot_tmpdir/scmroot/vim'...
$ git fetch origin f2e1a4c7cbecd5219cda9c4815a4c9f340fd5c57:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/vim
 * [new ref]           f2e1a4c7cbecd5219cda9c4815a4c9f340fd5c57 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f2e1a4c7 - patchlevel 2120