$ git clone -n https://src.fedoraproject.org/rpms/ghc-torrent.git /var/lib/mock/f45-build-10893-425/root/chroot_tmpdir/scmroot/ghc-torrent
Cloning into '/var/lib/mock/f45-build-10893-425/root/chroot_tmpdir/scmroot/ghc-torrent'...
$ git fetch origin 8906b3714605191584ee9cbe1d9cfd208d64f464:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-torrent
 * [new ref]         8906b3714605191584ee9cbe1d9cfd208d64f464 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8906b37 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild