$ git clone -n https://src.fedoraproject.org/rpms/k3b.git /var/lib/mock/f42-build-side-1-3504952-45986/root/chroot_tmpdir/scmroot/k3b
Cloning into '/var/lib/mock/f42-build-side-1-3504952-45986/root/chroot_tmpdir/scmroot/k3b'...
$ git fetch origin 58087691b8a0776d27ebdf71740e9fd33588e9b4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/k3b
 * [new ref]         58087691b8a0776d27ebdf71740e9fd33588e9b4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5808769 25.04.0