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couple improvements in shell.nix

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Gabriel Fontes 2022-04-29 17:25:38 -03:00
parent fa0748a598
commit a4d2b03b3c
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1 changed files with 11 additions and 7 deletions
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18
shell.nix
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@ -1,16 +1,17 @@
# Shell for bootstrapping flake-enabled nix and home-manager, from any nix version # Shell for bootstrapping flake-enabled nix and home-manager, from any nix version
{ pkgs ? let { pkgs ? let
system = builtins.currentSystem or "Unknown system"; inherit (builtins) currentSystem pathExists fromJSON readFile;
nixpkgs = nixpkgs =
if builtins.pathExists ./flake.lock if pathExists ./flake.lock
then then
# If we have a lock, fetch locked nixpkgs # If we have a lock, fetch locked nixpkgs
let lock = (builtins.fromJSON (builtins.readFile ./flake.lock)).nodes.nixpkgs.locked; let
inherit ((fromJSON (readFile ./flake.lock)).nodes.nixpkgs) locked;
in in
fetchTarball { fetchTarball {
url = "https://github.com/nixos/nixpkgs/archive/${lock.rev}.tar.gz"; url = "https://github.com/nixos/nixpkgs/archive/${locked.rev}.tar.gz";
sha256 = lock.narHash; sha256 = locked.narHash;
} }
else else
# If not (probably because not flake-enabled), fetch nixos-unstable impurely # If not (probably because not flake-enabled), fetch nixos-unstable impurely
@ -18,13 +19,16 @@
url = "https://github.com/nixos/nixpkgs/archive/nixos-unstable.tar.gz"; url = "https://github.com/nixos/nixpkgs/archive/nixos-unstable.tar.gz";
}; };
system = currentSystem;
overlays = [ ];
in in
import nixpkgs { inherit system; } import nixpkgs { inherit system overlays; }
, ... , ...
}: }:
let let
# Enable experimental features without having to specify the argument # Enable experimental features without having to specify the argument
nix = (pkgs.writeShellScriptBin) "nix" '' nix = pkgs.writeShellScriptBin "nix" ''
exec ${pkgs.nixFlakes}/bin/nix --experimental-features "nix-command flakes" "$@" exec ${pkgs.nixFlakes}/bin/nix --experimental-features "nix-command flakes" "$@"
''; '';
in in