[Unit]
Description=Reset user at boot by setting a kernel parameter.
Before=basic.target
After=local-fs.target systemd-tmpfiles-setup.service
DefaultDependencies=no
ConditionKernelCommandLine=reset-user

[Service]
Type=oneshot
RemainAfterExit=yes
ExecStart=/usr/local/bin/reset-user

[Install]
WantedBy=basic.target