$ git clone -n https://src.fedoraproject.org/rpms/R-chron.git /var/lib/mock/f40-build-2031969-47657/root/chroot_tmpdir/scmroot/R-chron
Cloning into '/var/lib/mock/f40-build-2031969-47657/root/chroot_tmpdir/scmroot/R-chron'...
$ git fetch origin 1b66c993462602ffad9837a9bcc6eaded6458f9a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-chron
 * [new ref]         1b66c993462602ffad9837a9bcc6eaded6458f9a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1b66c99 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild