$ git clone -n https://src.fedoraproject.org/rpms/ghc-abstract-par.git /var/lib/mock/f45-build-9958-412/root/chroot_tmpdir/scmroot/ghc-abstract-par
Cloning into '/var/lib/mock/f45-build-9958-412/root/chroot_tmpdir/scmroot/ghc-abstract-par'...
$ git fetch origin 2aef2882d8c1c069f06afa9fdec71b6c6007e71a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-abstract-par
 * [new ref]         2aef2882d8c1c069f06afa9fdec71b6c6007e71a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2aef288 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild