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factor out a generic fetch from nixpkgs-compat

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Create fetch function which takes a valid flake input, and calls
fetchTarball with the revision and hash information from the flake.lock.

Useful for pulling the exact revision of flake inputs from not flake
expressions, such as those in shell.nix.
This commit is contained in:
Timothy DeHerrera 2020-12-28 23:08:11 -07:00
parent 828a939470
commit e7c0700959
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GPG key ID: 8985725DB5B0C122
4 changed files with 23 additions and 14 deletions
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17
compat/fetch.nix Normal file
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@ -0,0 +1,17 @@
let
inherit (builtins)
fetchTarball
fromJSON
readFile
;
lockfile = fromJSON (readFile ../flake.lock);
in
input:
let
locked = lockfile.nodes."${input}".locked;
inherit (locked) rev narHash owner repo;
in
fetchTarball {
url = "https://github.com/${owner}/${repo}/archive/${rev}.tar.gz";
sha256 = narHash;
}

5
compat/nixpkgs.nix Normal file
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@ -0,0 +1,5 @@
let
fetch = import ./fetch.nix;
nixpkgs = fetch "nixos";
in
nixpkgs

13
nixpkgs-compat.nix
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@ -1,13 +0,0 @@
let
inherit (builtins)
fetchTarball
fromJSON
readFile
;
nixos = (fromJSON (readFile ./flake.lock)).nodes.nixos.locked;
nixpkgs = fetchTarball {
url = "https://github.com/NixOS/nixpkgs/archive/${nixos.rev}.tar.gz";
sha256 = nixos.narHash;
};
in
nixpkgs

2
shell.nix
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@ -1,5 +1,5 @@
let
nixpkgs' = import ./nixpkgs-compat.nix;
nixpkgs = import ./compat/nixpkgs.nix;
in
{ pkgs ? import nixpkgs { }, nixpkgs ? nixpkgs' }:
let