$ git clone -n https://src.fedoraproject.org/rpms/skyviewer.git /var/lib/mock/f45-build-36056-701/root/chroot_tmpdir/scmroot/skyviewer
Cloning into '/var/lib/mock/f45-build-36056-701/root/chroot_tmpdir/scmroot/skyviewer'...
$ git fetch origin 7b5d257eda204583857146ea272f2ceadc1d88ec:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/skyviewer
 * [new ref]         7b5d257eda204583857146ea272f2ceadc1d88ec -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7b5d257 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild