$ git clone -n https://src.fedoraproject.org/rpms/rpmdevtools.git /var/lib/mock/f42-bootstrap-3462912-45593/root/chroot_tmpdir/scmroot/rpmdevtools
Cloning into '/var/lib/mock/f42-bootstrap-3462912-45593/root/chroot_tmpdir/scmroot/rpmdevtools'...
$ git fetch origin 2e6a03f01b709b45a5eeb00e008253f8981bf12f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rpmdevtools
 * [new ref]         2e6a03f01b709b45a5eeb00e008253f8981bf12f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2e6a03f update to latest git 83b35ac changes