$ git clone -n https://src.fedoraproject.org/rpms/perl-Tapper.git /var/lib/mock/f45-build-26456-617/root/chroot_tmpdir/scmroot/perl-Tapper
Cloning into '/var/lib/mock/f45-build-26456-617/root/chroot_tmpdir/scmroot/perl-Tapper'...
$ git fetch origin b788e297c385edd75008ca06c35547c9fce34ae4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Tapper
 * [new ref]         b788e297c385edd75008ca06c35547c9fce34ae4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b788e29 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild