$ git clone -n https://src.fedoraproject.org/rpms/ghc-cookie.git /var/lib/mock/f45-build-10136-413/root/chroot_tmpdir/scmroot/ghc-cookie
Cloning into '/var/lib/mock/f45-build-10136-413/root/chroot_tmpdir/scmroot/ghc-cookie'...
$ git fetch origin 47ddbb8213146b54da0c644f8f1a1ab7d150fc6a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-cookie
 * [new ref]         47ddbb8213146b54da0c644f8f1a1ab7d150fc6a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 47ddbb8 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild