$ git clone -n https://src.fedoraproject.org/rpms/rrdtool.git /var/lib/mock/f40-build-2205071-51982/root/chroot_tmpdir/scmroot/rrdtool
Cloning into '/var/lib/mock/f40-build-2205071-51982/root/chroot_tmpdir/scmroot/rrdtool'...
$ git fetch origin cc5c2286c7cf7b6753b65a34b0bdd29191aab2d2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rrdtool
 * [new ref]         cc5c2286c7cf7b6753b65a34b0bdd29191aab2d2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cc5c228 Rebuild for https://fedoraproject.org/wiki/Changes/Ruby_3.3