$ git clone -n https://src.fedoraproject.org/rpms/kde-gtk-config.git /var/lib/mock/f42-build-862513-170850/root/chroot_tmpdir/scmroot/kde-gtk-config
Cloning into '/var/lib/mock/f42-build-862513-170850/root/chroot_tmpdir/scmroot/kde-gtk-config'...
$ git fetch origin 165a1bfa29f2f9844c580edfc8a61805ff2ee1f0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kde-gtk-config
 * [new ref]         165a1bfa29f2f9844c580edfc8a61805ff2ee1f0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 165a1bf 6.2.4