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This is to improve image creation reproducibility. Since the nar format doesn't support hard link, the tar stream of a layer can be different if a dependency of a layer has been built locally or if it has been fetched from a binary cache. If the dependency has been build locally, it can contain hard links which are encoded in the tar stream. If the dependency has been fetched from a binary cache, the tar stream doesn't contain any hard link. So even if the content is the same, tar streams are different.
Nixpkgs is a collection of packages for the Nix package manager. It is periodically built and tested by the Hydra build daemon as so-called channels. To get channel information via git, add nixpkgs-channels as a remote:
% git remote add channels git://github.com/NixOS/nixpkgs-channels.git
For stability and maximum binary package support, it is recommended to maintain
custom changes on top of one of the channels, e.g. nixos-17.09 for the latest
release and nixos-unstable for the latest successful build of master:
% git remote update channels
% git rebase channels/nixos-17.09
For pull-requests, please rebase onto nixpkgs master.
NixOS Linux distribution source code is located inside
nixos/ folder.
- NixOS installation instructions
- Documentation (Nix Expression Language chapter)
- Manual (How to write packages for Nix)
- Manual (NixOS)
- Community maintained wiki
- Continuous package builds for unstable/master
- Continuous package builds for 17.09 release
- Tests for unstable/master
- Tests for 17.09 release
Communication: