$ git clone -n https://src.fedoraproject.org/rpms/dtkgui.git /var/lib/mock/f42-build-side-1-3568055-46743/root/chroot_tmpdir/scmroot/dtkgui
Cloning into '/var/lib/mock/f42-build-side-1-3568055-46743/root/chroot_tmpdir/scmroot/dtkgui'...
$ git fetch origin 920395d0f1d01b70b9d3a936fd3ac15968e68b17:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/dtkgui
 * [new ref]         920395d0f1d01b70b9d3a936fd3ac15968e68b17 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 920395d Rebuild (qt5)