$ git clone -n https://src.fedoraproject.org/rpms/kf6-kiconthemes.git /var/lib/mock/f42-build-862180-170674/root/chroot_tmpdir/scmroot/kf6-kiconthemes
Cloning into '/var/lib/mock/f42-build-862180-170674/root/chroot_tmpdir/scmroot/kf6-kiconthemes'...
$ git fetch origin b90d8cb3d8cef6ba9eadb8d2cb29355711600fea:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf6-kiconthemes
 * [new ref]         b90d8cb3d8cef6ba9eadb8d2cb29355711600fea -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b90d8cb 6.8.0