Guide on pinning Nixpkgs to specific versions using various methods.
Field note
This guide explains how to specify remote Nix expressions like Nixpkgs, covering NIX_PATH, -I option, and fetchers, with examples and tips for finding specific commits.
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Ways to use it
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Product features
Use fetchurl, fetchTarball, fetchGit or Nixpkgs fetchers in Nix expressions.
Use status.nixos.org for latest tested commits and active release channels.
Pass Nixpkgs path via -I option to nix-build, nix-shell, etc.
Specify Nixpkgs location via NIX_PATH environment variable.
Local file paths, pinned commits, channel versions, shorthand syntax, and release branches.