$ git clone -n https://src.fedoraproject.org/rpms/RemoteBox.git /var/lib/mock/f39-build-1456699-32928/root/chroot_tmpdir/scmroot/RemoteBox
Cloning into '/var/lib/mock/f39-build-1456699-32928/root/chroot_tmpdir/scmroot/RemoteBox'...
$ git fetch origin 1fc2cf5c8fcd57e4f1e3406def4adcf18848815b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/RemoteBox
 * [new ref]         1fc2cf5c8fcd57e4f1e3406def4adcf18848815b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1fc2cf5 Update to 3.2