$ git clone -n https://src.fedoraproject.org/rpms/ghc-cborg.git /var/lib/mock/f45-build-10084-413/root/chroot_tmpdir/scmroot/ghc-cborg
Cloning into '/var/lib/mock/f45-build-10084-413/root/chroot_tmpdir/scmroot/ghc-cborg'...
$ git fetch origin 2c75d5ee442dff2bddbfb0eb23454f690b3e5c03:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-cborg
 * [new ref]         2c75d5ee442dff2bddbfb0eb23454f690b3e5c03 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2c75d5e Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild