$ git clone -n https://src.fedoraproject.org/rpms/kde-gtk-config.git /var/lib/mock/f40-build-2546884-61911/root/chroot_tmpdir/scmroot/kde-gtk-config
Cloning into '/var/lib/mock/f40-build-2546884-61911/root/chroot_tmpdir/scmroot/kde-gtk-config'...
$ git fetch origin ce4fb23d82fe2e608c3589bf66ac1700f1c946aa:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kde-gtk-config
 * [new ref]         ce4fb23d82fe2e608c3589bf66ac1700f1c946aa -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ce4fb23 6.0.2