$ git clone -n https://src.fedoraproject.org/rpms/plasma-systemmonitor.git /var/lib/mock/f42-build-3348009-45005/root/chroot_tmpdir/scmroot/plasma-systemmonitor
Cloning into '/var/lib/mock/f42-build-3348009-45005/root/chroot_tmpdir/scmroot/plasma-systemmonitor'...
$ git fetch origin 74c42a7da5f23cfe319ccf97fdaedb006b1aca4e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plasma-systemmonitor
 * [new ref]         74c42a7da5f23cfe319ccf97fdaedb006b1aca4e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 74c42a7 6.3.2