$ git clone -n https://src.fedoraproject.org/rpms/rs.git /var/lib/mock/f45-build-34676-690/root/chroot_tmpdir/scmroot/rs
Cloning into '/var/lib/mock/f45-build-34676-690/root/chroot_tmpdir/scmroot/rs'...
$ git fetch origin 44bd6436fe10a8e7691276fe5de5101a743fd2f7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rs
 * [new ref]         44bd6436fe10a8e7691276fe5de5101a743fd2f7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 44bd643 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild