$ git clone -n https://src.fedoraproject.org/rpms/libomp18.git /var/lib/mock/f41-build-855735-167348/root/chroot_tmpdir/scmroot/libomp18
Cloning into '/var/lib/mock/f41-build-855735-167348/root/chroot_tmpdir/scmroot/libomp18'...
$ git fetch origin 82ac8fbd23292bf158977d84a7c2b30523ace100:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libomp18
 * [new ref]         82ac8fbd23292bf158977d84a7c2b30523ace100 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 82ac8fb Update to 18.1.8