doc/packaging_apps.md

App packaging

This document aimed to learn you how to package an application for YunoHost.

Requirements

To package an application, here are the requirements:

• An account on a git server as GitHub to publish the application;
• Control a minimum git, Shell and other programming stuffs;
• A testing virtual machine or a distant server to package and test the package.

Content

A YunoHost package is composed of:

• A manifest.json file
• A scripts directory, which contains five Shell scripts: install, remove, upgrade, backup and restore
• Optional directories, containing sources or conf files
• A LICENSE file containing the license of the package
• A presentation page of your package in a README.md file

 A basic package feel free to use it as a framework.

Manifest

Manifest

Scripts

Scripts

Architecture and arguments

Since YunoHost has a unified architecture, you will be able to guess most of the settings you need. But if you need variable ones, like the domain or web path, you will have to ask the administrator at installation (see arguments section in the manifest above).

Arguments management

Nginx configuration

Nginx configuration

Multi-instance

Multi-instance

Hooks

YunoHost provides a hook system, which is accessible via the packager's script callbacks in moulinette (CLI). The scripts have to be placed in the hooks repository at the root of the YunoHost package, and must be named priority-hook_name, for example: hooks/50-post_user_create will be executed after each user creation.

Note: priority is optional, default is 50.

Take a look at the ownCloud package for a working example.

Helpers

Helpers

Test it!

In order to test your package, you can execute your script standalone as admin (do not forget to append required arguments):

su - admin -c "/bin/bash /path/to/my/script my_arg1 my_arg2"

Or you can use moulinette:

yunohost app install /path/to/my/app/package

Note that it also works with a Git URL:

yunohost app install https://github.com/author/my_app_package.git

Enhance package

You will find points to verify quality of your scripts:

• scripts should use sudo cp -a ../sources/. $final_path instead of sudo cp -a ../sources/* $final_path;
• install script must contain support in case of script errors to delete residuals files thanks to set -e and trap;
• install script should use command line method instead of curl call through web install form;
• install script should save install answers;
• application sources should be checked with a control sum (sha256, sha1 or md5) or a PGP signature;
• scripts had been tested on Debian Jessie as well as 32 bits, 64 bits and ARM architectures;
• backup and restore scripts are present and functional.

Package script checker

Package checker

This is a Python script which check:

• that the package is up to date wich last specifications
• that all files are present
• that the manifest don't have syntax error
• that scripts exit well before modifing the system during verifications.

Publish and ask for testing your application

• Publishing a post on the Forum with the App integration category, to ask tests and returns on your application.

• Ask to add your application in the app repository to be displayed in the non-official apps list. Precise his progress state: notworking, inprogress, or working.

Officalization of an application

To become an official application, it must be enough tested, stable and should works on 64 bits, 32 bits et ARM processors architectures and on Debian Jessie. If you think thoses conditions are gather, ask for official integration of your application.