How to install for flathub Evolution?

[2e8]

Linux Mint (Ubuntu) repository has only old version of evolution (3.18). It looks like new versions are distributed as flathub only. I have installed Evolution (3.34) from flathub and Evolution-DecSync plugin for this version from deb, but don't see it in plugin list.

[39aldo39]

Unfortunately the plugin doesn't work for flathub. I'm also looking for other distribution options, but 3.18 is a very old version. Maybe the 3.28 version does work?

[2e8]

I have tried also the latest 3.34. It also doesn't work.

[cizmazia]

Installing Evolution via Flatpak seems to be the recommended way to get the latest version regardless of the distro. However, I am not familiar with Flatpak in order to be able to configure its sandbox permissions, so that your plugin is visible to Evolution. Any advice?

[39aldo39]

I don't see where they say that Flatpak is the recommended way. I am also not very familiar with it, but I think Evolution needs to have explicit plugin support for it to be possible (which may be complicated), or it has to be built into Evolution directly. Unfortunately, I don't think it will be supported anytime soon.

[cizmazia]

Thanks for your response.

There seem to be only Flatpak and the source code mentioned on the main page: https://wiki.gnome.org/Apps/Evolution

If we figured out how to make it work with the Flatpaked version that would make your plugin available on any distro.

[cizmazia]

I've attempted to add DecSync to the flatpak build config (but didn't know how to add all build dependencies): https://gitlab.gnome.org/GNOME/evolution/raw/master/flatpak/org.gnome.Evolution-stable.json

[39aldo39]

How have you tried it so far? Your link is to the original version.

[mcrha]

For what it's worth, once https://github.com/flathub/org.gnome.Evolution/pull/101 is accepted, you'll be able to build an extension for it in a similar way as is suggested here: https://github.com/flathub/org.gnome.Evolution/pull/101/commits/c808b65977955acd2f0fc162482a56d7bf4e94e4 Or something like this (which has lighter dependencies, most of them provided by the org.gnome.Evolution): org.gnome.Evolution.Extension.evolution-ews.json.txt (the .txt. extension doesn't belong there, but this website doesn't let me attach .json files).

[mcrha]

To add to my previous comment, the main problem would be with libdecsync, because it uses unsupported build system by the Flatpak - the only supported build systems are: autotools, cmake, cmake-ninja, meson, simple, qmake at the moment (search for buildsystem at https://docs.flatpak.org/en/latest/flatpak-builder-command-reference.html ). Thus I guess you either need to switch to a supported build system for the library or bundle it: https://docs.flatpak.org/en/latest/dependencies.html#bundling , though bundling is not ideal, from my point of view. Adding the whole build system to the flatpak build is out of question, I believe.

[racalle]

This cappability to use DecSync in flatpak will be perfect for syncing Google Calendar between devices without the need of suffering the privacy problem of installing the Google Play Services on Android

[DominiqueSite]

Support for out-of-tree extensions was added in January this year: https://github.com/flathub/org.gnome.Evolution/pull/108