$ git clone -n https://src.fedoraproject.org/rpms/libpaper.git /var/lib/mock/f45-build-16742-490/root/chroot_tmpdir/scmroot/libpaper
Cloning into '/var/lib/mock/f45-build-16742-490/root/chroot_tmpdir/scmroot/libpaper'...
$ git fetch origin 850246f1bd4d31f922cd6e5b0d301916b570d670:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libpaper
 * [new ref]         850246f1bd4d31f922cd6e5b0d301916b570d670 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 850246f Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild