[Unit]
Description=Use update-engine to do an OTA right after we get Internet
DefaultDependencies=No
After=network-online.target
Wants=network-online.target

[Service]
Type=oneshot

# This service should be considered started even after the ExecStart line below
# has finished.  If you want to run this service again, do:
# systemctl stop update-engine.service
# systemctl restart update-engine-oneshot
RemainAfterExit=yes

# Normally, the update-engine.service will sleep for a random amount of time
# between 1 second and 3600 seconds (1 hour).  This change will make sure that
# we only sleep for 1 second and then immediately try to download and install
# an OTA.
ExecStartPre=/bin/bash -c 'echo UPDATE_ENGINE_MAX_SLEEP=1 > /run/update-engine-oneshot.env'

# I wish I could find a cleaner way to do this, but this will literally use systemd to
# start the update-engine.service
ExecStart=/bin/systemctl start update-engine

[Install]
WantedBy=multi-user.target