$ git clone -n https://src.fedoraproject.org/rpms/ktimer.git /var/lib/mock/f41-build-side-1-2956324-35552/root/chroot_tmpdir/scmroot/ktimer
Cloning into '/var/lib/mock/f41-build-side-1-2956324-35552/root/chroot_tmpdir/scmroot/ktimer'...
$ git fetch origin b6100a55e6da14fdae9b8bc50c38b988037f0599:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ktimer
 * [new ref]         b6100a55e6da14fdae9b8bc50c38b988037f0599 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b6100a5 24.08.2