$ git clone -n https://src.fedoraproject.org/rpms/gnome-kiosk.git /var/lib/mock/f39-build-1645721-40352/root/chroot_tmpdir/scmroot/gnome-kiosk
Cloning into '/var/lib/mock/f39-build-1645721-40352/root/chroot_tmpdir/scmroot/gnome-kiosk'...
$ git fetch origin 0119f42fc46796bf9371d416737072c963ca5392:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gnome-kiosk
 * [new ref]         0119f42fc46796bf9371d416737072c963ca5392 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0119f42 Update to 45.0