$ git clone -n https://src.fedoraproject.org/rpms/kf6-kiconthemes.git /var/lib/mock/f42-build-side-1-3587407-46931/root/chroot_tmpdir/scmroot/kf6-kiconthemes
Cloning into '/var/lib/mock/f42-build-side-1-3587407-46931/root/chroot_tmpdir/scmroot/kf6-kiconthemes'...
$ git fetch origin f650afe6dd95e7c0c4aac3c621fa8334566de356:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf6-kiconthemes
 * [new ref]         f650afe6dd95e7c0c4aac3c621fa8334566de356 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f650afe 6.16.0