recipes-google/flash/bmc-bios-update/bios-update-powercycle-hook.service

[Unit]
Description=BIOS update before powercycle
Before=gbmc-psu-hardreset.target

[Service]
ExecStart=/usr/bin/bios-update-powercycle-hook.sh
Type=oneshot

[Install]
WantedBy=gbmc-psu-hardreset.target