[systemd-devel] udev rule, continue to next rule only if preb failed

[daggs]

Greetings Lennart,

> Sent: Friday, May 26, 2023 at 11:23 AM
> From: "Lennart Poettering" <lennart at poettering.net>
> To: "daggs" <daggs at gmx.com>
> Cc: systemd-devel at lists.freedesktop.org
> Subject: Re: [systemd-devel] udev rule, continue to next rule only if preb failed
>
> On Do, 25.05.23 20:25, daggs (daggs at gmx.com) wrote:
>
> > Greetings,
> >
> > I'm trying to implement the following behavior:
> > if a usb is added ot removed, run a script before all other existing rules but continue to existing iff the script failed
> > I've added the following rule to /etc/udev/rules.d/5-usb_vm.rules:
> > ACTION=="add", SUBSYSTEM=="usb", RUN="/usr/local/bin/handle_udev_action"
> > ACTION=="remove", SUBSYSTEM=="usb", RUN="/usr/local/bin/handle_udev_action"
> >
> > /usr/local/bin/handle_udev_action runs exit 1 iff the device is a specific one (for testing)
> > but the code continues to the next rule.
> > is there any way to stop it if the script returned 9?
>
> Please see documentation. RUN= is invoked *after* the rules have
> finished execution.
>
> There's IMPORT{program}=, which is run as part of rule processing, but it can only be used for very quickly
> running programs, and you have to communicate results of your script
> via properties you write to stdout rather than exit status.
>
> Lennart
>
> --
> Lennart Poettering, Berlin
>

thank you for the information, I'll into it

Dagg