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README.md

Service Layer Abstraction Modules

The Service Layer Abstraction Modules (SLAM) are Nix expressions for building NixOS-like operating systems. SLAM borrows code from NixOS and has some compatible options. It differs in an explicitly open design when interfacing with the system-layer, where system-layer is defined as the confluence of service-managers, messaging buses, configuration management, and monitoring.

SLAM is a derivative of finix which is upstream in regards to support for the finit supervisor.

See the Synit wiki for more information.

Portability

SLAM supports NixOS modular-services which are referred to here as "portable-services". SLAM allows a choice of primary service-manager and provides the ability to run secondary service-managers as portable-services.

service-manager composability matrix
finit
Host		 s6
Host		 Synit
Host		 NixOS
Host
Finit
Guest		 unknown unknown unknown unknown
s6
Guest		 unknown planned supported supported
Synit
Guest		 unknown supported supported supported
NixOS
Guest		 nope nope nope nope
Abstract
Services		 supported supported supported supported

Running a tertiary service-manager as a portable service in a portable service is not supported.

Installation and Booting

The modules are currently provided as-is without documented procedures for installation or managing bootloaders. A system.topLevel attribute is provided within the option tree that roughly corresponds to NixOS and contains a bootspec file that is compatible with NixOS tooling.

Timeline

  • 2003 Nix project started by Eelco Dolstra.
  • 2006-01-18 The Purely Functional Software Deployment Model published by Eelco Dolstra.
  • 2006-08-24 NixOS: the Nix based operating system published by Armijn Hemel. Uses System V init.
  • 2006-11-19 NixOS migrates to Upstart.
  • 2012-04-18 Guix first commit from Ludovic Courtès.
  • 2013-01-21 NixOS migrates to systemd.
  • 2016-06-03 not-os first commit from Michael Bishop.
  • 2017-11-03 vpsadminos forked from not-os by Richard Marko.
  • 2018-05-13 NixWRT announced by Daniel Barlow.
  • 2019-07-30 Sigil first commit.
  • 2020-01-28 nix-processmgmt framework first commit from Sander van der Burg.
  • 2021-03-13 NixOS Init Freedom first commit from Guido Witmond.
  • 2021-03-23 NixNG first commit from Richard Brežák.
  • 2021-08-18 Spectrum first commit from Alyssa Ross.
  • 2022-01-17 ZilchOS first commit from Alexander Sosedkin.
  • 2022-09-19 Liminix first commit from Daniel Barlow.
  • 2023-10-05 Portable Service Layer RFC submitted by Sander van der Burg.
  • 2023-12-24 NixBSD first commit from Audrey Dutcher.
  • 2024-12-28 SixOS first demo commit from Adam Joseph.
  • 2025-01-08 Modular Services PR submitted by Robert Hensing.
  • 2025-03-29 Finix first commit from Aaron Andersen.
  • 2025-11-11 SLAM forked from Finix.

License

Some modules are available only under the terms of the Peer Production License. Modules not explicitly licensed are under the same terms as Nixpkgs.