$ git clone -n https://src.fedoraproject.org/rpms/kf6-purpose.git /var/lib/mock/f42-build-868106-175915/root/chroot_tmpdir/scmroot/kf6-purpose
Cloning into '/var/lib/mock/f42-build-868106-175915/root/chroot_tmpdir/scmroot/kf6-purpose'...
$ git fetch origin 6d67a469f4e8b00695df352c379012eef4b59a3c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf6-purpose
 * [new ref]         6d67a469f4e8b00695df352c379012eef4b59a3c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6d67a46 Rebuilt for https://fedoraproject.org/wiki/Fedora_42_Mass_Rebuild