$ git clone -n https://src.fedoraproject.org/rpms/ksystemstats.git /var/lib/mock/f40-build-803137-144186/root/chroot_tmpdir/scmroot/ksystemstats
Cloning into '/var/lib/mock/f40-build-803137-144186/root/chroot_tmpdir/scmroot/ksystemstats'...
$ git fetch origin aa591a0344ca9d0796370bc2fbd44028afb63461:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ksystemstats
 * [new ref]         aa591a0344ca9d0796370bc2fbd44028afb63461 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at aa591a0 6.0.3