$ git clone -n https://src.fedoraproject.org/rpms/kactivitymanagerd.git /var/lib/mock/f40-build-2095862-50398/root/chroot_tmpdir/scmroot/kactivitymanagerd
Cloning into '/var/lib/mock/f40-build-2095862-50398/root/chroot_tmpdir/scmroot/kactivitymanagerd'...
$ git fetch origin 821c7f3683d68f1336bdf79e2e2e38df0c4cdb58:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kactivitymanagerd
 * [new ref]         821c7f3683d68f1336bdf79e2e2e38df0c4cdb58 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 821c7f3 fix: upload missing sources