$ git clone -n https://src.fedoraproject.org/rpms/3dprinter-udev-rules.git /var/lib/mock/f42-build-side-1-3582708-46886/root/chroot_tmpdir/scmroot/3dprinter-udev-rules
Cloning into '/var/lib/mock/f42-build-side-1-3582708-46886/root/chroot_tmpdir/scmroot/3dprinter-udev-rules'...
$ git fetch origin 3e099e1f7c51a8cf25d18927487736e9b762383b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/3dprinter-udev-rules
 * [new ref]         3e099e1f7c51a8cf25d18927487736e9b762383b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3e099e1 Update to 0.4