$ git clone -n https://src.fedoraproject.org/rpms/vim.git /var/lib/mock/f40-build-2044673-48733/root/chroot_tmpdir/scmroot/vim
Cloning into '/var/lib/mock/f40-build-2044673-48733/root/chroot_tmpdir/scmroot/vim'...
$ git fetch origin 5863537d72823092bb3a3caa393ebae0b3bc3e29:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/vim
 * [new ref]           5863537d72823092bb3a3caa393ebae0b3bc3e29 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5863537d - patchlevel 2167