Make os packages mutually exclusive

Last week I started experimenting with using rez on linux and osx, and quickly discovered that OS packages are not mutually exclusive (I think I may be the first person actually using rez on two operating systems at the same site). There is nothing stopping a resolve on osx from pulling in packages that require Linux. Making Linux and Darwin anti-packages of each other only protects against bad resolves by aborting the resolution.

My plan is to create an “os” package, with versions per os: os-darwin, os-linux, os-windows. Versions are inherently mutually exclusive, so it will prevent os-darwin and os-linux from being loaded simultaneously, and thus allow packages that require or vary on these to resolve properly.

To achieve this, we will first need to implement a new type of Version subclass that supports a string label.

name: os
version: linux

name: os
version: darwin

name: os
version: windows

similarly, architectures can be implemented with arch-i386 and arch-x86_64 packages.

name: arch
version: x86_64

name: arch
version: i386

lastly, specific versions of an operating system can be implemented as their own packages. e.g. osx-10.8.1, fedora-19, etc. Here are some complete examples from windows, with numeric versions taken from wikipedia.

name : windows
version: 7  # technically, this is version 6.1
requires:
- os-windows
variants:
- [arch-x86_64]
- [arch-i386]

name : windows
version: 6.0
version_alias: Vista
requires:
- os-windows
variants:
- [arch-x86_64]
- [arch-i386]

name : windows
version: 5.1
version_alias: XP
requires:
- os-windows
variants:
- [arch-x86_64]
- [arch-i386]

name : windows
version: 5.0
version_alias: 2000
requires:
- os-windows
- arch-i386

[nerdvegas]

Yes, we’ve standardized on platform/arch/os packages for a long time now. That’s juts default behavior though, you’re free to do this as you’d like. Note this entry in rezconfig.py:

implicit_packages = [ “~platform=={system.platform}”, “~arch=={system.arch}”, “~os=={system.os}”, ]

https://github.com/nerdvegas/rez/wiki/Basic-Concepts#weak-references Some packages may not be platform dependent, hence the weak references.

Hth A

On Mon, Apr 22, 2019 at 11:41 PM Marcus Ottosson [e-mail] wrote:

Is this implemented? 😃

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[mottosso]

Is this implemented? 😃