$ git clone -n https://src.fedoraproject.org/rpms/R-systemfonts.git /var/lib/mock/f39-build-1510593-35499/root/chroot_tmpdir/scmroot/R-systemfonts
Cloning into '/var/lib/mock/f39-build-1510593-35499/root/chroot_tmpdir/scmroot/R-systemfonts'...
$ git fetch origin feb78ef7cc59410e2ebbdff66ac9f861986bf82c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-systemfonts
 * [new ref]         feb78ef7cc59410e2ebbdff66ac9f861986bf82c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at feb78ef Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild