$ git clone -n https://src.fedoraproject.org/rpms/vim.git /var/lib/mock/f40-build-2251924-54162/root/chroot_tmpdir/scmroot/vim
Cloning into '/var/lib/mock/f40-build-2251924-54162/root/chroot_tmpdir/scmroot/vim'...
$ git fetch origin e07dd4f3909c197c759dde86593932da18958b32:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/vim
 * [new ref]           e07dd4f3909c197c759dde86593932da18958b32 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e07dd4f3 - patchlevel 31