$ git clone -n https://src.fedoraproject.org/rpms/merkuro.git /var/lib/mock/f39-build-2120292-50737/root/chroot_tmpdir/scmroot/merkuro
Cloning into '/var/lib/mock/f39-build-2120292-50737/root/chroot_tmpdir/scmroot/merkuro'...
$ git fetch origin 8221296349f5e7c0868bd4dbc309e0e056d7f521:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/merkuro
 * [new ref]         8221296349f5e7c0868bd4dbc309e0e056d7f521 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8221296 23.08.4