$ git clone -n https://src.fedoraproject.org/rpms/ytree.git /var/lib/mock/f42-build-3354855-45022/root/chroot_tmpdir/scmroot/ytree
Cloning into '/var/lib/mock/f42-build-3354855-45022/root/chroot_tmpdir/scmroot/ytree'...
$ git fetch origin 870a53389c81e3c1a0cda2fe47effc9663ddb8aa:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ytree
 * [new ref]         870a53389c81e3c1a0cda2fe47effc9663ddb8aa -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 870a533 Rebuilt for https://fedoraproject.org/wiki/Fedora_42_Mass_Rebuild