[enh] add xz decompression for sources

[grosmanal]

The problem

Forgejo application is a single executable file. It is released compressed in xz format (https://codeberg.org/forgejo/forgejo/releases)
Yunohost does not allow to extract such archives with ynh_setup_source helper. The extraction has to be done in install script.
Since Yunohost supports tar.xz format (and many others), it should supports xz format as well.

Solution

Update ynh_setup_source helper to introduce the xz format.

PR Status

Ready to test

How to test

• get forgejo package source (https://github.com/YunoHost-Apps/forgejo_ynh)
• remove format and extract configuration from [resources.sources.main]
• set rename configuration to «forgejo» in [resources.sources.main]
• remove extraction line in scripts/install (xz -d "$install_dir/forgejo.xz")
• install the app

[zamentur]

tar.xz is already supported but not xz alone, should we add gzip and bzip2 (without tar) too ?

[zamentur]

Documentation should be change too:
https://github.com/YunoHost/yunohost/blob/dev/src/utils/resources.py#L318

[grosmanal]

tar.xz is already supported but not xz alone, should we add gzip and bzip2 (without tar) too ?

I can add it too. It seems a good idea for Yunohost to supports theses formats.

[grosmanal]

I'll make a PR for documentation soon (I hope 😄 )

[grosmanal]

Alongside xz / gz / bz2 extraction, I propose in this PR to rename the extracted file automaticaly (if rename is not set) to :

• the app name if it's the main source
• the source name otherwise

What do you think about this ?

[alexAubin]

@grosmanal : it's pretty much already what it does (except that "main" is kept to "main"), because unless you use the rename option of the resource, the assumption is that you don't care what the name is because it's gonna be extracted automagically anyway in 99% of cases

[alexAubin]

I'm confused by this because this will lead to inconsistent behavior between this case and other case (where the main source is just kept as "main" and not "$app") x_X ... What's the rationale for this ?

[grosmanal]

The goal is to allow the omission of rename in resource definition. (I just remember, writing this line, I've mentioned to set rename in the «how to test» section of this PR 🥴)

In the the forgejo app case, I thought it was logical to extract the archive to the same name as the application one.