How is it possible, that Signal still only provides a .deb package and no .rpm, or even better AppImage or Flatpak? There is an unofficial Flatpak but is it secure?
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Just because something is built out of love does not make it safe, and attestation is about safety. You wouldn’t trust an un-attested surgical device, just because there’s a really positive community around its design.
Signal is a life-or-death app for some people.
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The ‘appstore’ of some distributions, e.g. Linux Mint, displays a warning or hint for unofficial flatpaks. In Mint the display of unofficial flatpaks are toggled off by default and there is a warning or recommendation displayed against toggling on.
I’m not a developer so I can’t really check myself
I just read through the unofficial Flathub Flatpak for Signal and it is very simple. It fetches the .deb from Signal’s website, installs it in the sandbox, and uses a launcher script to tell the OS some basic toggles like should it start minimized or should it display a tray icon. In the script it makes use of zypak, which to my understanding is to tell electron (chromium) to allow sandboxing to be handled by Flatpak. Here is the repo and the build instructions is the .yaml file.
I mean it’s FOSS. Have you considered opening a PR to contribute what’s missing? You can be the change you want to see. I wouldn’t normally comment something like this. Your emphasis on “still” raised my hackles a little bit and led me to ask why you still haven’t made your own.
Not everyone is a developer and they closed issues on github so why bother?
There’s also Flare fwiw: