$ git clone -n https://src.fedoraproject.org/rpms/opencv.git /var/lib/mock/f39-build-1967289-43301/root/chroot_tmpdir/scmroot/opencv
Cloning into '/var/lib/mock/f39-build-1967289-43301/root/chroot_tmpdir/scmroot/opencv'...
$ git fetch origin fb8443873603132bda5fa8869d067291f1a2dbfc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/opencv
 * [new ref]         fb8443873603132bda5fa8869d067291f1a2dbfc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fb84438 Update opencv to 4.8.1