$ git clone -n https://src.fedoraproject.org/rpms/mtxclient.git /var/lib/mock/f38-build-side-42-init-devel-800433-28144/root/chroot_tmpdir/scmroot/mtxclient
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-800433-28144/root/chroot_tmpdir/scmroot/mtxclient'...
$ git fetch origin d5fbddc97d56995edacf5fc1d2147681af6e95c2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mtxclient
 * [new ref]         d5fbddc97d56995edacf5fc1d2147681af6e95c2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d5fbddc Updated to version 0.9.2.