$ git clone -n https://src.fedoraproject.org/rpms/qzxing.git /var/lib/mock/f41-build-843745-162083/root/chroot_tmpdir/scmroot/qzxing
Cloning into '/var/lib/mock/f41-build-843745-162083/root/chroot_tmpdir/scmroot/qzxing'...
$ git fetch origin f3d41de7a65a693e373504fad05889f13f4c3a97:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/qzxing
 * [new ref]         f3d41de7a65a693e373504fad05889f13f4c3a97 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f3d41de Initial import (fedora#2299900)