RE: [PATCH v7] image-postproc: gate systemd preset-all on masked unit state

["'Prusty, Badrikesh' via isar-users" <isar-users@googlegroups.com>]

Hi,

Apologies for delayed response.

> The proposed handling below is not a replacement for masking the unit,
> but a fix for the error you experienced during preset-all.
> 
> Based on the example you gave, that would result in something like:
> 
> ```
> cat meta-isar/recipes-example/no-ctrl-alt-del/files/postinst
> #!/bin/sh
> 
> systemctl mask ctrl-alt-del.target
> 
> echo "disable reboot.target" > /usr/lib/systemd/system-preset/00-
> reboot-target-mask.preset
> ```
>

I tried the suggested solution, and it is working as expected, the build completed
without any issues.

Initially there was concern this might affect systemctl reboot or reboot commands,
but both works as expected. Found out reboot.target is merely an alias for ctrl-alt-del.target,
and the actual reboot is performed by system-reboot.service which remains unaffected.

```
$ cat /usr/lib/systemd/system/reboot.target
[Unit]
Description=System Reboot
Documentation=man:systemd.special(7)
DefaultDependencies=no
Requires=systemd-reboot.service
After=systemd-reboot.service
AllowIsolate=yes
JobTimeoutSec=30min
JobTimeoutAction=reboot-force

[Install]
Alias=ctrl-alt-del.target
```

Many thanks,
Badri

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