$ git clone -n https://src.fedoraproject.org/rpms/k3b.git /var/lib/mock/f39-build-1729466-41247/root/chroot_tmpdir/scmroot/k3b
Cloning into '/var/lib/mock/f39-build-1729466-41247/root/chroot_tmpdir/scmroot/k3b'...
$ git fetch origin bb170742e9aafe1a42b418d83276fb99101261f9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/k3b
 * [new ref]         bb170742e9aafe1a42b418d83276fb99101261f9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bb17074 23.08.3