$ git clone -n https://src.fedoraproject.org/rpms/iguanaIR.git /var/lib/mock/f42-build-3406896-45143/root/chroot_tmpdir/scmroot/iguanaIR
Cloning into '/var/lib/mock/f42-build-3406896-45143/root/chroot_tmpdir/scmroot/iguanaIR'...
$ git fetch origin 42c0cc778a6d3433eb6277002fe57b5982a4a07c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/iguanaIR
 * [new ref]         42c0cc778a6d3433eb6277002fe57b5982a4a07c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 42c0cc7 Add sysusers.d config file to allow rpm to create users/groups automatically