$ git clone -n https://src.fedoraproject.org/rpms/kf6-kholidays.git /var/lib/mock/f42-build-863239-171518/root/chroot_tmpdir/scmroot/kf6-kholidays
Cloning into '/var/lib/mock/f42-build-863239-171518/root/chroot_tmpdir/scmroot/kf6-kholidays'...
$ git fetch origin dfc37a993a425b947c66687ca35f8b9ed9849875:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf6-kholidays
 * [new ref]         dfc37a993a425b947c66687ca35f8b9ed9849875 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dfc37a9 Frameworks 6.9