$ git clone -n https://src.fedoraproject.org/rpms/plasma-mobile.git /var/lib/mock/f42-bootstrap-3533979-46428/root/chroot_tmpdir/scmroot/plasma-mobile
Cloning into '/var/lib/mock/f42-bootstrap-3533979-46428/root/chroot_tmpdir/scmroot/plasma-mobile'...
$ git fetch origin 33e34f9cb26b842a3ba92c975c71ebaf0fcbbf8f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plasma-mobile
 * [new ref]         33e34f9cb26b842a3ba92c975c71ebaf0fcbbf8f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 33e34f9 6.3.5