$ git clone -n https://src.fedoraproject.org/rpms/ksystemstats.git /var/lib/mock/f40-build-2126231-50780/root/chroot_tmpdir/scmroot/ksystemstats
Cloning into '/var/lib/mock/f40-build-2126231-50780/root/chroot_tmpdir/scmroot/ksystemstats'...
$ git fetch origin b24d578b6f731e6ff1161fc882532320d42834fb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ksystemstats
 * [new ref]         b24d578b6f731e6ff1161fc882532320d42834fb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b24d578 5.91.0