$ git clone -n https://src.fedoraproject.org/rpms/mtxclient.git /var/lib/mock/f40-build-770694-125877/root/chroot_tmpdir/scmroot/mtxclient
Cloning into '/var/lib/mock/f40-build-770694-125877/root/chroot_tmpdir/scmroot/mtxclient'...
$ git fetch origin 57aee5815b030e9ac41d7dcc910984c82500a92e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mtxclient
 * [new ref]         57aee5815b030e9ac41d7dcc910984c82500a92e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 57aee58 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild