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Add reboot with BootNext

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Jan Schär 2025-03-08 16:56:37 +01:00
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commit bee5eb3984
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contestops/readme.md
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@ -168,14 +168,39 @@ rsync -e "ssh -F local.ssh_config" -av --chown contestant:contestant backups/con
Stop the periodic backup command with Ctrl+C.
Rename the `backups` folder to e.g. `backups-day1`.
You can shut down all machines.
Machines should be rebooted from USB stick between contests (e.g. between practice and actual contest) to ensure all data is erased.
There is a script which helps with this: It sets the color scheme to dark as a visual marker for not yet rebooted machines, and then shows a question dialog.
You can then insert a boot USB stick and press Enter, and the machine will reboot.
```
parallel-ssh -x "-F local.ssh_config" -h hostlist "nohup reboot-interactive > /dev/null 2> /dev/null &"
```
If the machines don't boot from USB stick by default, you can run the following command beforehand to make them boot from USB stick.
This is especially useful when the boot menu is password protected, because then you don't need to enter the password again.
This command sets the EFI BootNext setting to the current boot option.
The BootNext setting only applies for the next boot, and is then deleted by the EFI, so you have to run the command again before rebooting again.
This should also work when you power off the machines and turn them back on later (e.g. on the next day).
```
parallel-ssh -x "-F local.ssh_config" -h hostlist 'efibootmgr --bootnext $(efibootmgr | grep -xE "BootCurrent: [0-9a-fA-F]{4}" | cut "-d " -f2)'
```
An alternative to setting BootNext is to reboot using kexec.
This is a partial reboot which does not go through EFI, so it is faster, but less reliable.
For example, in my testing it only works once; the second time the screen stays blank.
You can try improving the reliability, but otherwise I would avoid this method.
```
parallel-ssh -x "-F local.ssh_config" -h hostlist 'kexec --kexec-file-syscall --load /vmlinuz --initrd=/initrd.img --append="$(cat /proc/cmdline)"'
```
When the event is over, you can shut down all machines:
```
parallel-ssh -x "-F local.ssh_config" -h hostlist poweroff
```
Machines should be shut down and booted again from USB stick between contests (e.g. between practice and actual contest) to ensure all data is erased.
## Contest lock screen
The contest lock screen is a gnome extension which can lock the screen and show a countdown until the contest starts.