$ git clone -n https://src.fedoraproject.org/rpms/vim.git /var/lib/mock/f40-build-2720033-73029/root/chroot_tmpdir/scmroot/vim
Cloning into '/var/lib/mock/f40-build-2720033-73029/root/chroot_tmpdir/scmroot/vim'...
$ git fetch origin 305932eca006eef0714a16101d8ef8d9992d0891:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/vim
 * [new ref]           305932eca006eef0714a16101d8ef8d9992d0891 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 305932ec - patchlevel 309