[BUG] PiSugar3 firmware update peculiarities

[mitpre]

Environment

• Pi hardware version: Raspberry Pi Zero W Rev 1.1
• OS version: Raspbian GNU/Linux 11 (bullseye) (debian 11.4)
• Application version: 1.7.1
• PiSugar 3 firmware version: 1.2.6

When doing the firmware update of my PiSugar 3 board with curl https://cdn.pisugar.com/release/PiSugarUpdate.sh | sudo bash you should be asked the to confirm that the following is true:

WARNING:
1. PLEASE CONFIRM THAT THE BATTERY IS FULLY CHARGED
2. SYSTEMD SERVICE pisugar-server MUST BE STOPPED
OTHERWISE UPGRADE MAY NOT SUCCEED!!!
CONFIRM? (y or n):

However, the script just flies past this point and continues without any input. Then at the end, few seconds after the update is completed as successful with the following message:

Upgrade finished!
Wait 1s, PiSugar will jump to application soon!
Wait for five seconds
Starting pisugar-server...
Upgrade complete!
If you need help, visit https://github.com/PiSugar/

You get the following message to the terminal Low battery, will power off after 16 seconds and soon thereafter everything powers off.

The PiSugar logs are the following:

Aug 15 16:43:27 rolete systemd[1]: Stopping pisugar-server...
Aug 15 16:43:28 rolete systemd[1]: pisugar-server.service: Succeeded.
Aug 15 16:43:28 rolete systemd[1]: Stopped pisugar-server.
Aug 15 16:43:28 rolete systemd[1]: pisugar-server.service: Consumed 3.056s CPU time.
Aug 15 16:44:01 rolete systemd[1]: Started pisugar-server.
Aug 15 16:44:01 rolete pisugar-server[548]: [2022-08-15T14:44:01Z INFO  pisugar_core::pisugar3] PiSugar3 battery bus: 0x01 addr: 0x57
Aug 15 16:44:01 rolete pisugar-server[548]: [2022-08-15T14:44:01Z INFO  pisugar_server] TCP listening...
Aug 15 16:44:01 rolete pisugar-server[548]: [2022-08-15T14:44:01Z INFO  pisugar_server] WS listening...
Aug 15 16:44:01 rolete pisugar-server[548]: [2022-08-15T14:44:01Z INFO  pisugar_server] UDS listening...
Aug 15 16:44:01 rolete pisugar-server[548]: [2022-08-15T14:44:01Z INFO  pisugar_server] Http web server listening...
Aug 15 16:44:01 rolete pisugar-server[548]: [2022-08-15T14:44:01Z INFO  pisugar_core] Init rtc...
Aug 15 16:44:01 rolete pisugar-server[548]: [2022-08-15T14:44:01Z INFO  pisugar_core] Init battery...
Aug 15 16:44:07 rolete pisugar-server[548]: [2022-08-15T14:44:07Z WARN  pisugar_server] Battery low: 0
Aug 15 16:44:07 rolete pisugar-server[548]: [2022-08-15T14:44:07Z WARN  pisugar_server] Low battery, will power off after 16 seconds
Aug 15 16:44:07 rolete pisugar-server[548]: [2022-08-15T14:44:07Z WARN  pisugar_server] Battery low: 0
Aug 15 16:44:07 rolete pisugar-server[555]: Shutdown scheduled for Mon 2022-08-15 16:44:07 CEST, use 'shutdown -c' to cancel.
Aug 15 16:44:07 rolete pisugar-server[548]: [2022-08-15T14:44:07Z WARN  pisugar_server] Battery low: 0
Aug 15 16:44:07 rolete pisugar-server[559]: Shutdown scheduled for Mon 2022-08-15 16:44:07 CEST, use 'shutdown -c' to cancel.
Aug 15 16:44:07 rolete pisugar-server[548]: [2022-08-15T14:44:07Z WARN  pisugar_server] Battery low: 0
Aug 15 16:44:07 rolete pisugar-server[561]: Shutdown scheduled for Mon 2022-08-15 16:44:07 CEST, use 'shutdown -c' to cancel.
Aug 15 16:44:07 rolete pisugar-server[548]: [2022-08-15T14:44:07Z WARN  pisugar_server] Battery low: 0
Aug 15 16:44:08 rolete systemd[1]: Stopping pisugar-server...
Aug 15 16:44:10 rolete systemd[1]: pisugar-server.service: Succeeded.
Aug 15 16:44:10 rolete systemd[1]: pisugar-server.service: Unit process 562 (sh) remains running after unit stopped.
Aug 15 16:44:10 rolete systemd[1]: pisugar-server.service: Unit process 563 (shutdown) remains running after unit stopped.
Aug 15 16:44:10 rolete systemd[1]: Stopped pisugar-server.
Aug 15 16:44:10 rolete pisugar-server[563]: Failed to call ScheduleShutdown in logind, no action will be taken: Message recipient disconnected from message bus without replying

The first four lines are for shutting the server down by the firmware update script. Then update happens, and afterwards the pisugar-server is started again with the fifth line.