$ git clone -n https://src.fedoraproject.org/rpms/merkuro.git /var/lib/mock/f39-build-1643370-40234/root/chroot_tmpdir/scmroot/merkuro
Cloning into '/var/lib/mock/f39-build-1643370-40234/root/chroot_tmpdir/scmroot/merkuro'...
$ git fetch origin d1436774681d35d071e0e0c6316cd8c05a87eb69:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/merkuro
 * [new ref]         d1436774681d35d071e0e0c6316cd8c05a87eb69 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d143677 23.08.2