$ git clone -n https://src.fedoraproject.org/rpms/merkuro.git /var/lib/mock/f38-build-side-42-init-devel-1414009-31434/root/chroot_tmpdir/scmroot/merkuro
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1414009-31434/root/chroot_tmpdir/scmroot/merkuro'...
$ git fetch origin 436f9de23e5a2202b1053fd5ed889430312ca309:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/merkuro
 * [new ref]         436f9de23e5a2202b1053fd5ed889430312ca309 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 436f9de Initial import (fedora#2240100).