$ git clone -n https://src.fedoraproject.org/rpms/mtx.git /var/lib/mock/f38-build-714403-94801/root/chroot_tmpdir/scmroot/mtx
Cloning into '/var/lib/mock/f38-build-714403-94801/root/chroot_tmpdir/scmroot/mtx'...
$ git fetch origin cac8db934a4ee31b05e5b14c1ca5ec25bcfbcec6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mtx
 * [new ref]         cac8db934a4ee31b05e5b14c1ca5ec25bcfbcec6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cac8db9 Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild