$ git clone -n https://src.fedoraproject.org/rpms/papirus-icon-theme.git /var/lib/mock/f45-build-21389-584/root/chroot_tmpdir/scmroot/papirus-icon-theme
Cloning into '/var/lib/mock/f45-build-21389-584/root/chroot_tmpdir/scmroot/papirus-icon-theme'...
$ git fetch origin 871667a994b44c57a305f2641879060b3fd0abcb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/papirus-icon-theme
 * [new ref]         871667a994b44c57a305f2641879060b3fd0abcb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 871667a Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild