$ git clone -n https://src.fedoraproject.org/rpms/ghc-simple-cmd.git /var/lib/mock/f45-build-10768-424/root/chroot_tmpdir/scmroot/ghc-simple-cmd
Cloning into '/var/lib/mock/f45-build-10768-424/root/chroot_tmpdir/scmroot/ghc-simple-cmd'...
$ git fetch origin b8b79d00c123a9c3fa051233b767c96572182ed3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-simple-cmd
 * [new ref]         b8b79d00c123a9c3fa051233b767c96572182ed3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b8b79d0 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild