$ git clone -n https://src.fedoraproject.org/rpms/opencv.git /var/lib/mock/f42-build-863024-171338/root/chroot_tmpdir/scmroot/opencv
Cloning into '/var/lib/mock/f42-build-863024-171338/root/chroot_tmpdir/scmroot/opencv'...
$ git fetch origin 2c623cae488fefe13b667223653889a89302438c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/opencv
 * [new ref]         2c623cae488fefe13b667223653889a89302438c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2c623ca Rebuild (tesseract)