$ git clone -n https://src.fedoraproject.org/rpms/ghc-either.git /var/lib/mock/f45-build-10233-414/root/chroot_tmpdir/scmroot/ghc-either
Cloning into '/var/lib/mock/f45-build-10233-414/root/chroot_tmpdir/scmroot/ghc-either'...
$ git fetch origin 782414104ca4d68afa141a6d13e44f898653f0ea:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-either
 * [new ref]         782414104ca4d68afa141a6d13e44f898653f0ea -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7824141 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild