Notification on GUI from shell script

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Kevin Windrem asked Jan 11, '22

Notification on GUI from shell script

I have a shell script that needs to put up a warning on the GUI (like "toast" used in the QML code).

Is there a way??

I am using a blind install mechanism to install my SetupHelper package. It turns out people inadvertently leave the SD card/USB stick containing the venus-data.tar.tz file on it inserted in the GX device, so the next reboot steps on the work just done.

Short of removing venus-data.tar.gz from the media I can't figure out a way to prevent the mechanism from activating again on the next boot. I hate do be that drastic because installers may wish to use the same USB stick on several GX devices.

I'm open to ideas.

Venus OS

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Modifications Space

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Answer 1 · 2022-01-12T12:37:40Z

bathnm answered · Jan 12, 2022 at 12:37 PM

@Kevin Windrem If there is no ability to send a message to the GUI, rather than delete how about....

1) Write the devices serial number or something unique as an empty file on the sd-card. Then check if that file exists and if it does do not re-run. A re-install can then be triggered by deleting the file for that device from the sd-card

OR

2) putting a version number on the file name, then check the file name version against the installed version.

None are ideal....

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Kevin Windrem commented · Jan 12, 2022 at 04:39 PM

The venus-data.tgz mechanism has no control. It unpacks the archive and places everything in /data. What Victron and others including myself have done is include an rcS.local file in the archive, so a second reboot does something. But the first boot has already done "damage".

I have implemented a workaround that no longer requires a notification: I changed my archive to include include an alternate directory for SetupHelper (SetupHelper-blind), so the original folder is not touched by the mechanism. I then run a script that does version checks and only updates SetupHelper if SetupHelper-blind is a newer version.

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Answer 2 · 2022-01-12T16:31:42Z

mvader (Victron Energy) answered · Jan 12, 2022 at 04:31 PM

Would this help? https://github.com/victronenergy/venus/issues/853

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Kevin Windrem commented · Jan 12, 2022 at 04:48 PM

Not sure. I can't get to https://victrondevelopment.slack.com

I did propose a change a while back that would provide a mechanism with more control:

modify /etc/init.d/update-data.sh to look for a program to run so we didn't need to use the venus-data.tgz mechanism at all.

if update-data.sh checked for and ran an AutoRun.sh file on the media, then we would have control of what happened.

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mvader (Victron Energy) ♦♦ Kevin Windrem commented · Jan 12, 2022 at 10:51 PM

Yes, you won’t need to see the slack, see my comment under the main issue. Looks like exactly your suggestion- right?

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Kevin Windrem mvader (Victron Energy) ♦♦ commented · Jan 12, 2022 at 11:27 PM

Yes, if the main issue is upon inserting SD/USB media, that is exactly my suggestion as well.

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mvader (Victron Energy) ♦♦ Kevin Windrem commented · Jan 13, 2022 at 04:50 AM

Hi it will most likely be on boot; not on insertion; since iirc we don’t detect insertion properly on all hardware. But I’ll leave that decision to the experts.

Another possible advantage fr during boot is that you’d know the state of venus os when the script is called (booting)

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