$ git clone -n https://src.fedoraproject.org/rpms/rott.git /var/lib/mock/f45-build-34650-690/root/chroot_tmpdir/scmroot/rott
Cloning into '/var/lib/mock/f45-build-34650-690/root/chroot_tmpdir/scmroot/rott'...
$ git fetch origin b90b6ea0386db914bfeaf137a022a2aa76593d19:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rott
 * [new ref]         b90b6ea0386db914bfeaf137a022a2aa76593d19 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b90b6ea Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild