$ git clone -n https://src.fedoraproject.org/rpms/ghc-hosc.git /var/lib/mock/f45-build-10379-416/root/chroot_tmpdir/scmroot/ghc-hosc
Cloning into '/var/lib/mock/f45-build-10379-416/root/chroot_tmpdir/scmroot/ghc-hosc'...
$ git fetch origin b0abea2fa9f19e55cc01cfe627f3baf6b6b36b6c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-hosc
 * [new ref]         b0abea2fa9f19e55cc01cfe627f3baf6b6b36b6c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b0abea2 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild