AppImage

[probonopd]

This PR, when merged, will compile this application on Travis CI upon each git push, and upload an AppImage to your GitHub Releases page.

Providing an AppImage would have, among others, these advantages:

• Applications packaged as an AppImage can run on many distributions (including Ubuntu, Fedora, openSUSE, CentOS, elementaryOS, Linux Mint, and others)
• One app = one file = super simple for users: just download one AppImage file, make it executable, and run
• No unpacking or installation necessary
• No root needed
• No system libraries changed
• Works out of the box, no installation of runtimes needed
• Optional desktop integration with appimaged
• Optional binary delta updates, e.g., for continuous builds (only download the binary diff) using AppImageUpdate
• Can optionally GPG2-sign your AppImages (inside the file)
• Works on Live ISOs
• Can use the same AppImages when dual-booting multiple distributions
• Can be listed in the AppImageHub central directory of available AppImages
• Can double as a self-extracting compressed archive with the --appimage-extract parameter
• No repositories needed. Suitable/optimized for air-gapped (offline) machines

Here is an overview of projects that are already distributing upstream-provided, official AppImages.

PLEASE NOTE: For this to work, you need to enable Travis CI for your repository as described here prior to merging this, if you haven't already done so. Also, You need to set up GITHUB_TOKEN in Travis CI for this to work; please see https://github.com/probonopd/uploadtool.

If you have questions, AppImage developers are on #AppImage on irc.freenode.net.

[probonopd]

An AppImage for testing is available at https://github.com/probonopd/Quaternion/releases

[KitsuneRal]

Many thanks for bringing this in such a complete way - I couldn't expect such a service. I'd like to do a couple of changes though, as described below.

[probonopd]

Thanks for merging.

Now it would be great if the continuous builds would appear on https://github.com/QMatrixClient/Quaternion/releases so that people can find them easily.

[KitsuneRal]

I've chosen to keep them at bintray instead, will update README.md soon: https://bintray.com/qmatrixclient/ci/Quaternion. GH Releases is kept for actual releases.

[KitsuneRal]

And many thanks for pushing this forward!

[probonopd]

Thank you. Looks like we need to use this.

libstdc++.so.6: version `CXXABI_1.3.9' not found (required by /run/firejail/appimage/.appimage-10328/usr/bin/../lib/libQt5QuickWidgets.so.5)

Please see https://github.com/AppImage/AppImageKit/wiki/Creating-AppImages#libstdcso6

[KitsuneRal]

For the record, the latest images have this workaround.

As mentioned elsewhere, I can only provide AppImages for testing. For AppImages as "official" binary releases (as much as I want something of that kind) I need some basic security for AppImageKit to be in place that would ensure that it's not easy to subvert AppImageKit toolchain. Yes I know that Travis and AppVeyor are unknown variables in this respect as well; but these are relatively large organisations at least, and their infrastructure cannot be easily subverted.

[probonopd]

Hi @KitsuneRal can you please define your exact needs, what would the AppImage project need to do in order to fulfill all of your security requirements? Please feel free to open an issue in https://github.com/AppImage/AppImageKit.

Thanks.