docs: add installation steps for nix#2523
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sylvestre merged 2 commits intomozilla:mainfrom Dec 23, 2025
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## main #2523 +/- ##
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Coverage 71.06% 71.06%
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Files 64 64
Lines 35394 35394
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Hits 25153 25153
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(from previous PR) I tried this flake on my system and I noticed it still does instantiate a separate version of nixpkgs shown by the flake.lock (i think) {
inputs = {
nixpkgs.url = "github:NixOS/nixpkgs/nixos-24.11";
sccache.url = "github:troykomodo/sccache/cxx20-modules";
};
outputs = { self, nixpkgs, sccache, ... }:
let
system = "x86_64-linux";
pkgs = import nixpkgs {
inherit system;
overlays = [ sccache.overlays.default ];
};
in {
devShells.${system}.default = pkgs.mkShell {
buildInputs = [ pkgs.sccache ];
};
};
}the flake.lock contains {
"nodes": {
"flake-utils": {
"inputs": {
"systems": "systems"
},
"locked": {
"lastModified": 1731533236,
"narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
"owner": "numtide",
"repo": "flake-utils",
"rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
"type": "github"
},
"original": {
"owner": "numtide",
"repo": "flake-utils",
"type": "github"
}
},
"nixpkgs": {
"locked": {
"lastModified": 1765838191,
"narHash": "sha256-m5KWt1nOm76ILk/JSCxBM4MfK3rYY7Wq9/TZIIeGnT8=",
"owner": "NixOS",
"repo": "nixpkgs",
"rev": "c6f52ebd45e5925c188d1a20119978aa4ffd5ef6",
"type": "github"
},
"original": {
"owner": "NixOS",
"ref": "nixos-25.11",
"repo": "nixpkgs",
"type": "github"
}
},
"nixpkgs_2": {
"locked": {
"lastModified": 1765838191,
"narHash": "sha256-m5KWt1nOm76ILk/JSCxBM4MfK3rYY7Wq9/TZIIeGnT8=",
"owner": "NixOS",
"repo": "nixpkgs",
"rev": "c6f52ebd45e5925c188d1a20119978aa4ffd5ef6",
"type": "github"
},
"original": {
"owner": "NixOS",
"ref": "nixos-25.11",
"repo": "nixpkgs",
"type": "github"
}
},
"root": {
"inputs": {
"nixpkgs": "nixpkgs",
"sccache": "sccache"
}
},
"sccache": {
"inputs": {
"flake-utils": "flake-utils",
"nixpkgs": "nixpkgs_2"
},
"locked": {
"lastModified": 1766157939,
"narHash": "sha256-n0N62klMafQFR1MvktplfR1RZMYX5D5V8T0M3FkiPDM=",
"owner": "troykomodo",
"repo": "sccache",
"rev": "71e9190be7ca9c294be12f764b6f7205b3073780",
"type": "github"
},
"original": {
"owner": "troykomodo",
"ref": "troy/cxx20-modules",
"repo": "sccache",
"type": "github"
}
},
"systems": {
"locked": {
"lastModified": 1681028828,
"narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
"owner": "nix-systems",
"repo": "default",
"rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
"type": "github"
},
"original": {
"owner": "nix-systems",
"repo": "default",
"type": "github"
}
}
},
"root": "root",
"version": 7
}Adding this to the inputs caused the nixpkgs to only be represented once. sccache.inputs.nixpkgs.follows = "nixpkgs";Only question is did mess up the overlay or is this expected and its actually fine? |
doronbehar
reviewed
Dec 22, 2025
doronbehar
approved these changes
Dec 23, 2025
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Adds installation steps for nix after #2518
likely should have been in that PR, but I forgot.. Sorry!
cc @nbp
maybe cc @doronbehar (upstream nixpkgs maintainer for sccache)
not sure if the upstream can take advantage of this create exporting a flake now, just pinging for awareness.