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tatey/1_sources.nix

Created February 23, 2023 23:17
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  1. tatey created this gist Feb 23, 2023.
    138 changes: 138 additions & 0 deletions 1_sources.nix
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    # This file has been generated by Niv.

    let

    #
    # The fetchers. fetch_<type> fetches specs of type <type>.
    #

    fetch_file = pkgs: spec:
    if spec.builtin or true then
    builtins_fetchurl { inherit (spec) url sha256; }
    else
    pkgs.fetchurl { inherit (spec) url sha256; };

    fetch_tarball = pkgs: name: spec:
    let
    ok = str: ! builtins.isNull (builtins.match "[a-zA-Z0-9+-._?=]" str);
    # sanitize the name, though nix will still fail if name starts with period
    name' = stringAsChars (x: if ! ok x then "-" else x) "${name}-src";
    in
    if spec.builtin or true then
    builtins_fetchTarball { name = name'; inherit (spec) url sha256; }
    else
    pkgs.fetchzip { name = name'; inherit (spec) url sha256; };

    fetch_git = spec:
    builtins.fetchGit { url = spec.repo; inherit (spec) rev ref; };

    fetch_local = spec: spec.path;

    fetch_builtin-tarball = name: throw
    ''[${name}] The niv type "builtin-tarball" is deprecated. You should instead use `builtin = true`.
    $ niv modify ${name} -a type=tarball -a builtin=true'';

    fetch_builtin-url = name: throw
    ''[${name}] The niv type "builtin-url" will soon be deprecated. You should instead use `builtin = true`.
    $ niv modify ${name} -a type=file -a builtin=true'';

    #
    # Various helpers
    #

    # The set of packages used when specs are fetched using non-builtins.
    mkPkgs = sources:
    let
    sourcesNixpkgs =
    import (builtins_fetchTarball { inherit (sources.nixpkgs) url sha256; }) {};
    hasNixpkgsPath = builtins.any (x: x.prefix == "nixpkgs") builtins.nixPath;
    hasThisAsNixpkgsPath = <nixpkgs> == ./.;
    in
    if builtins.hasAttr "nixpkgs" sources
    then sourcesNixpkgs
    else if hasNixpkgsPath && ! hasThisAsNixpkgsPath then
    import <nixpkgs> {}
    else
    abort
    ''
    Please specify either <nixpkgs> (through -I or NIX_PATH=nixpkgs=...) or
    add a package called "nixpkgs" to your sources.json.
    '';

    # The actual fetching function.
    fetch = pkgs: name: spec:

    if ! builtins.hasAttr "type" spec then
    abort "ERROR: niv spec ${name} does not have a 'type' attribute"
    else if spec.type == "file" then fetch_file pkgs spec
    else if spec.type == "tarball" then fetch_tarball pkgs name spec
    else if spec.type == "git" then fetch_git spec
    else if spec.type == "local" then fetch_local spec
    else if spec.type == "builtin-tarball" then fetch_builtin-tarball name
    else if spec.type == "builtin-url" then fetch_builtin-url name
    else
    abort "ERROR: niv spec ${name} has unknown type ${builtins.toJSON spec.type}";

    # Ports of functions for older nix versions

    # a Nix version of mapAttrs if the built-in doesn't exist
    mapAttrs = builtins.mapAttrs or (
    f: set: with builtins;
    listToAttrs (map (attr: { name = attr; value = f attr set.${attr}; }) (attrNames set))
    );

    # https://github.com/NixOS/nixpkgs/blob/0258808f5744ca980b9a1f24fe0b1e6f0fecee9c/lib/lists.nix#L295
    range = first: last: if first > last then [] else builtins.genList (n: first + n) (last - first + 1);

    # https://github.com/NixOS/nixpkgs/blob/0258808f5744ca980b9a1f24fe0b1e6f0fecee9c/lib/strings.nix#L257
    stringToCharacters = s: map (p: builtins.substring p 1 s) (range 0 (builtins.stringLength s - 1));

    # https://github.com/NixOS/nixpkgs/blob/0258808f5744ca980b9a1f24fe0b1e6f0fecee9c/lib/strings.nix#L269
    stringAsChars = f: s: concatStrings (map f (stringToCharacters s));
    concatStrings = builtins.concatStringsSep "";

    # fetchTarball version that is compatible between all the versions of Nix
    builtins_fetchTarball = { url, name, sha256 }@attrs:
    let
    inherit (builtins) lessThan nixVersion fetchTarball;
    in
    if lessThan nixVersion "1.12" then
    fetchTarball { inherit name url; }
    else
    fetchTarball attrs;

    # fetchurl version that is compatible between all the versions of Nix
    builtins_fetchurl = { url, sha256 }@attrs:
    let
    inherit (builtins) lessThan nixVersion fetchurl;
    in
    if lessThan nixVersion "1.12" then
    fetchurl { inherit url; }
    else
    fetchurl attrs;

    # Create the final "sources" from the config
    mkSources = config:
    mapAttrs (
    name: spec:
    if builtins.hasAttr "outPath" spec
    then abort
    "The values in sources.json should not have an 'outPath' attribute"
    else
    spec // { outPath = fetch config.pkgs name spec; }
    ) config.sources;

    # The "config" used by the fetchers
    mkConfig =
    { sourcesFile ? ./sources.json
    , sources ? builtins.fromJSON (builtins.readFile sourcesFile)
    , pkgs ? mkPkgs sources
    }: rec {
    # The sources, i.e. the attribute set of spec name to spec
    inherit sources;

    # The "pkgs" (evaluated nixpkgs) to use for e.g. non-builtin fetchers
    inherit pkgs;
    };
    in
    mkSources (mkConfig {}) // { __functor = _: settings: mkSources (mkConfig settings); }
    26 changes: 26 additions & 0 deletions 2_sources.json
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    {
    "niv": {
    "branch": "master",
    "description": "Easy dependency management for Nix projects",
    "homepage": "https://github.com/nmattia/niv",
    "owner": "nmattia",
    "repo": "niv",
    "rev": "ba57d5a29b4e0f2085917010380ef3ddc3cf380f",
    "sha256": "1kpsvc53x821cmjg1khvp1nz7906gczq8mp83664cr15h94sh8i4",
    "type": "tarball",
    "url": "https://github.com/nmattia/niv/archive/ba57d5a29b4e0f2085917010380ef3ddc3cf380f.tar.gz",
    "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
    },
    "nixpkgs": {
    "branch": "master",
    "description": "Nix Packages collection",
    "homepage": "",
    "owner": "NixOS",
    "repo": "nixpkgs",
    "rev": "84ee3aa55b34a5772533139edacadd1934f8a977",
    "sha256": "1a2fn16n5i27wp9a0b56jvch8kavvxslyicw7s82djfrbj65npgy",
    "type": "tarball",
    "url": "https://github.com/NixOS/nixpkgs/archive/84ee3aa55b34a5772533139edacadd1934f8a977.tar.gz",
    "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
    }
    }
    41 changes: 41 additions & 0 deletions gistfile1.txt
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    let
    sources = import ./nix/sources.nix;
    nixpkgs = import sources."nixpkgs" {};

    ruby = nixpkgs.ruby_3_1;
    bundler = nixpkgs.bundler.override { ruby = ruby; };

    nodejs = nixpkgs.nodejs-18_x;
    yarn = nixpkgs.yarn.override { nodejs = nodejs; };
    in
    nixpkgs.mkShell {
    buildInputs = [
    ruby
    bundler

    nodejs
    yarn

    nixpkgs.imagemagick
    nixpkgs.libiconv
    nixpkgs.libsass
    nixpkgs.niv
    nixpkgs.overmind
    nixpkgs.pkg-config
    nixpkgs.postgresql_12
    nixpkgs.zlib
    ];
    shellHook =
    let
    # We use the store-path for Ruby as our Bundler cache-key to avoid trying
    # to re-use native extensions that are linked against a Ruby that is no-longer in
    # the environment
    rubyId = nixpkgs.lib.last (nixpkgs.lib.strings.splitString "/" "${ruby}");
    in ''
    if [ -z "$BUNDLE_PATH" ]; then
    export BUNDLE_PATH=.bundle/${rubyId}
    else
    export BUNDLE_PATH=$BUNDLE_PATH/${rubyId}
    fi
    '';
    }