$ git clone -n http://git.inferitos.ru/rpms/opencv /var/lib/mock/inferit-8_8-build-15448-23060/root/chroot_tmpdir/scmroot/opencv
Cloning into '/var/lib/mock/inferit-8_8-build-15448-23060/root/chroot_tmpdir/scmroot/opencv'...
$ git fetch origin changed/i8c/opencv-3.4.6-8.el8:KOJI_FETCH_HEAD
From http://git.inferitos.ru/rpms/opencv
 * [new tag]         changed/i8c/opencv-3.4.6-8.el8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 82538f9 edit changelog for import opencv-3.4.6-8.el8