New Foundation API for Cross-Platform Resources?

rvenable · June 20, 2018, 1:40pm

In the WWDC 2018 talk about SPM, Rick Ballard mentions that SPM could eventually support resources via some new cross platform resource APIs in Foundation. What APIs was he referring to?

Aciid · June 20, 2018, 2:59pm

github.com

apple/swift-corelibs-foundation/blob/main/Docs/FHS Bundles.md

# Installed Bundles on UNIX-like Systems

This document covers {CF,NS,}Bundle behavior on Linux, with an eye to keeping things working for non-Linux OSes that have similar POSIX-y setups (in particular, the BSD family.) It covers _two_ different styles of bundle, which are suitable both for things that are installed systemwide (e.g. as part of a platform-supplied package manager), and for freestanding bundles that are embedded (e.g. resource bundles) or executed (e.g. app bundles) but not installed systemwide.

The aim of this proposal is to provide idiomatic ways for POSIX-y systems to use bundle API, including resource access, in a way equivalent to what Darwin OSes do for bundles installed in `/System` or `/Library`.

## Installed bundles

An installed bundle is intended to be installed in a directory hierarchy that models the use of `--prefix=…` in autoconf-like configuration tools. This is suitable for the kind of bundles that we would install in `/System/Library` or in `/Applications`, systemwide, on Darwin OSes: system frameworks, apps installed for all users, and so on.

This setup complies with the [Filesystem Hierarchy Standard (FHS) 3.0](https://refspecs.linuxfoundation.org/fhs.shtml), used by most Linux distributions. It also fits with the intent of the `/usr` and `/usr/local` directories of many BSD systems (e.g. from FreeBSD's [hier(7)][].)

[hier(7)]: https://www.freebsd.org/cgi/man.cgi?hier(7)

### Definition

An installed bundle exists if there is:

 - A directory with the `.resources` extension;
 - contained in a directory named `share`.

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