factor out a generic fetch from nixpkgs-compat
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.
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17
compat/fetch.nix
Normal file
17
compat/fetch.nix
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@ -0,0 +1,17 @@
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let
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inherit (builtins)
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fetchTarball
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fromJSON
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readFile
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;
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lockfile = fromJSON (readFile ../flake.lock);
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in
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input:
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let
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locked = lockfile.nodes."${input}".locked;
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inherit (locked) rev narHash owner repo;
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in
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fetchTarball {
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url = "https://github.com/${owner}/${repo}/archive/${rev}.tar.gz";
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sha256 = narHash;
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}
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5
compat/nixpkgs.nix
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5
compat/nixpkgs.nix
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@ -0,0 +1,5 @@
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let
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fetch = import ./fetch.nix;
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nixpkgs = fetch "nixos";
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in
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nixpkgs
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@ -1,13 +0,0 @@
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let
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inherit (builtins)
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fetchTarball
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fromJSON
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readFile
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;
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nixos = (fromJSON (readFile ./flake.lock)).nodes.nixos.locked;
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nixpkgs = fetchTarball {
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url = "https://github.com/NixOS/nixpkgs/archive/${nixos.rev}.tar.gz";
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sha256 = nixos.narHash;
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};
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in
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nixpkgs
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