$ git clone -n https://src.fedoraproject.org/rpms/ghc-polyparse.git /var/lib/mock/f45-build-10619-419/root/chroot_tmpdir/scmroot/ghc-polyparse
Cloning into '/var/lib/mock/f45-build-10619-419/root/chroot_tmpdir/scmroot/ghc-polyparse'...
$ git fetch origin a75c1663926e6bab81c3a1d753e4d69abbfaac88:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-polyparse
 * [new ref]         a75c1663926e6bab81c3a1d753e4d69abbfaac88 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a75c166 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild