WebGUI doesn't work with snap sandboxing

[Axel-Naumann]

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Description

Hi,

starting the webgui (new TBrowser) opens a chromium window which complains:

Your file couldn’t be accessed
It may have been moved, edited, or deleted.
ERR_FILE_NOT_FOUND

I guess this corresponds to the following process:

axel       17508    3604  4 15:51 pts/0    00:00:01     /snap/chromium/2950/usr/lib/chromium-browser/chrome --password-store --disable-features=TFLiteLanguageDetectionEnabled --window-size=1200,700 --new-window --app=file:///tmp/root_start_t9pNYd.html

Note that this is a snap package; the browser might not be allowed to access files in /tmp as per https://forum.snapcraft.io/t/can-browsers-open-local-files/3016

(I can work around this, but I thought it'd still be worthwhile to report this.)

Cheers, Axel

Reproducer

new TBrowser with web gui.

ROOT version

master

Installation method

source

Operating system

Ubuntu 24.04

Additional context

No response

[linev]

Hi Axel,

Can you try to add --allow-file-access-from-files to the command line?
It can be done with the following entry in .rootrc file:

WebGui.ChromeInteractive: $prog $geometry --new-window  --allow-file-access-from-files --app='$url'  &