61 lines
1.9 KiB
Nix
61 lines
1.9 KiB
Nix
{ rev # The Git revision of nixpkgs to fetch
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, sha256 # The SHA256 of the downloaded data
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, outputSha256 ? null # The SHA256 output hash
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, system ? builtins.currentSystem # This is overridable if necessary
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}:
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with {
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ifThenElse = { bool, thenValue, elseValue }: (
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if bool then thenValue else elseValue);
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};
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ifThenElse {
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bool = (0 <= builtins.compareVersions builtins.nixVersion "1.12");
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# In Nix 1.12, we can just give a `sha256` to `builtins.fetchTarball`.
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thenValue = (
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builtins.fetchTarball {
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url = "https://github.com/NixOS/nixpkgs/archive/${rev}.tar.gz";
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# builtins.fetchTarball does not need the sha256 hash of the
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# packed and compressed tarball but it _does_ need the
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# fixed-output sha256 hash.
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sha256 = outputSha256;
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});
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# This hack should at least work for Nix 1.11
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elseValue = (
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(rec {
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tarball = import <nix/fetchurl.nix> {
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url = "https://github.com/NixOS/nixpkgs/archive/${rev}.tar.gz";
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inherit sha256;
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};
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builtin-paths = import <nix/config.nix>;
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script = builtins.toFile "nixpkgs-unpacker" ''
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"$coreutils/mkdir" "$out"
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cd "$out"
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"$gzip" --decompress < "$tarball" | "$tar" -x --strip-components=1
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'';
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nixpkgs = builtins.derivation ({
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name = "nixpkgs-${builtins.substring 0 6 rev}";
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builder = builtins.storePath builtin-paths.shell;
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args = [ script ];
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inherit tarball system;
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tar = builtins.storePath builtin-paths.tar;
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gzip = builtins.storePath builtin-paths.gzip;
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coreutils = builtins.storePath builtin-paths.coreutils;
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} // (if null == outputSha256 then { } else {
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outputHashMode = "recursive";
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outputHashAlgo = "sha256";
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outputHash = outputSha256;
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}));
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}).nixpkgs);
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}
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