Samueldr at 18:09, 3 April 2024

2024-04-03T18:09:43Z

← Older revision		Revision as of 18:09, 3 April 2024
Line 11:		Line 11:
	let		let
	# Look here for information about how to generate `nixpkgs-version.json`.		# Look here for information about how to generate `nixpkgs-version.json`.
	# → https://nixos.~~wiki~~/wiki/FAQ/Pinning_Nixpkgs		# → https://wiki.nixos.org/wiki/FAQ/Pinning_Nixpkgs
	pinned = builtins.fromJSON (builtins.readFile ./nixpkgs.lock);		pinned = builtins.fromJSON (builtins.readFile ./nixpkgs.lock);
	inherit (pinned) url rev;		inherit (pinned) url rev;

imported>Expelledboy: Thinking to add a lock file example, but failing

2020-11-05T20:04:34Z

Thinking to add a lock file example, but failing

New page

I would like to achieve something like a lock file, but optionally used.

<nowiki>

# This allows overriding pkgs by passing `--arg production ...`
{
production ? false,
nixpkgs ? import <nixpkgs> {}
}:

let
# Look here for information about how to generate `nixpkgs-version.json`.
# → https://nixos.wiki/wiki/FAQ/Pinning_Nixpkgs
pinned = builtins.fromJSON (builtins.readFile ./nixpkgs.lock);
inherit (pinned) url rev;
ref = "nixos-unstable";

# Load packages from the pinned version.
pinnedNixpkgs = import (builtins.fetchGit {
inherit ref url rev;
}) {};

# Update ./nixpkgs.lock
nixpkgsUpdate = nixpkgs.writeScriptBin "update-nixpkgs" ''
#!/bin/sh
${nixpkgs.nix-prefetch-git}/bin/nix-prefetch-git ${url} refs/heads/${ref} > nixpkgs.lock
'';

pkgs = if production then pinnedNixpkgs else nixpkgs;
in

with pkgs; mkShell {
buildInputs = [
nodejs
nixpkgsUpdate
];
}

</nowiki>

Obviously this doens't work, but its close... not sure what I missed

Talk:FAQ/Pinning Nixpkgs - Revision history

Samueldr at 18:09, 3 April 2024

imported>Expelledboy: Thinking to add a lock file example, but failing