$ git clone -n https://src.fedoraproject.org/rpms/kf6-kiconthemes.git /var/lib/mock/f41-build-side-1-2751347-31100/root/chroot_tmpdir/scmroot/kf6-kiconthemes
Cloning into '/var/lib/mock/f41-build-side-1-2751347-31100/root/chroot_tmpdir/scmroot/kf6-kiconthemes'...
$ git fetch origin 666ea2e7f03823a606eac0431f6fe38a9f1b0eec:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf6-kiconthemes
 * [new ref]         666ea2e7f03823a606eac0431f6fe38a9f1b0eec -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 666ea2e 6.6.0