$ git clone -n https://src.fedoraproject.org/rpms/ksystemstats.git /var/lib/mock/f41-build-side-1-3003339-36656/root/chroot_tmpdir/scmroot/ksystemstats
Cloning into '/var/lib/mock/f41-build-side-1-3003339-36656/root/chroot_tmpdir/scmroot/ksystemstats'...
$ git fetch origin 3c3a796e82ada04cf1bcdb8debc1a82bcac31032:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ksystemstats
 * [new ref]         3c3a796e82ada04cf1bcdb8debc1a82bcac31032 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3c3a796 6.2.1