nix/sources.nix

   1 # This file has been generated by Niv.
   2
   3 let
   4
   5   #
   6   # The fetchers. fetch_<type> fetches specs of type <type>.
   7   #
   8
   9   fetch_file = pkgs: spec:
  10     if spec.builtin or true then
  11       builtins_fetchurl { inherit (spec) url sha256; }
  12     else
  13       pkgs.fetchurl { inherit (spec) url sha256; };
  14
  15   fetch_tarball = pkgs: name: spec:
  16     let
  17       ok = str: ! builtins.isNull (builtins.match "[a-zA-Z0-9+-._?=]" str);
  18       # sanitize the name, though nix will still fail if name starts with period
  19       name' = stringAsChars (x: if ! ok x then "-" else x) "${name}-src";
  20     in
  21       if spec.builtin or true then
  22         builtins_fetchTarball { name = name'; inherit (spec) url sha256; }
  23       else
  24         pkgs.fetchzip { name = name'; inherit (spec) url sha256; };
  25
  26   fetch_git = spec:
  27     builtins.fetchGit { url = spec.repo; inherit (spec) rev ref; };
  28
  29   fetch_builtin-tarball = name: throw
  30     ''[${name}] The niv type "builtin-tarball" is deprecated. You should instead use `builtin = true`.
  31         $ niv modify ${name} -a type=tarball -a builtin=true'';
  32
  33   fetch_builtin-url = name: throw
  34     ''[${name}] The niv type "builtin-url" will soon be deprecated. You should instead use `builtin = true`.
  35         $ niv modify ${name} -a type=file -a builtin=true'';
  36
  37   #
  38   # Various helpers
  39   #
  40
  41   # The set of packages used when specs are fetched using non-builtins.
  42   mkPkgs = sources:
  43     let
  44       sourcesNixpkgs =
  45         import (builtins_fetchTarball { inherit (sources.nixpkgs) url sha256; }) {};
  46       hasNixpkgsPath = builtins.any (x: x.prefix == "nixpkgs") builtins.nixPath;
  47       hasThisAsNixpkgsPath = <nixpkgs> == ./.;
  48     in
  49       if builtins.hasAttr "nixpkgs" sources
  50       then sourcesNixpkgs
  51       else if hasNixpkgsPath && ! hasThisAsNixpkgsPath then
  52         import <nixpkgs> {}
  53       else
  54         abort
  55           ''
  56             Please specify either <nixpkgs> (through -I or NIX_PATH=nixpkgs=...) or
  57             add a package called "nixpkgs" to your sources.json.
  58           '';
  59
  60   # The actual fetching function.
  61   fetch = pkgs: name: spec:
  62
  63     if ! builtins.hasAttr "type" spec then
  64       abort "ERROR: niv spec ${name} does not have a 'type' attribute"
  65     else if spec.type == "file" then fetch_file pkgs spec
  66     else if spec.type == "tarball" then fetch_tarball pkgs name spec
  67     else if spec.type == "git" then fetch_git spec
  68     else if spec.type == "builtin-tarball" then fetch_builtin-tarball name
  69     else if spec.type == "builtin-url" then fetch_builtin-url name
  70     else
  71       abort "ERROR: niv spec ${name} has unknown type ${builtins.toJSON spec.type}";
  72
  73   # Ports of functions for older nix versions
  74
  75   # a Nix version of mapAttrs if the built-in doesn't exist
  76   mapAttrs = builtins.mapAttrs or (
  77     f: set: with builtins;
  78     listToAttrs (map (attr: { name = attr; value = f attr set.${attr}; }) (attrNames set))
  79   );
  80
  81   # https://github.com/NixOS/nixpkgs/blob/0258808f5744ca980b9a1f24fe0b1e6f0fecee9c/lib/lists.nix#L295
  82   range = first: last: if first > last then [] else builtins.genList (n: first + n) (last - first + 1);
  83
  84   # https://github.com/NixOS/nixpkgs/blob/0258808f5744ca980b9a1f24fe0b1e6f0fecee9c/lib/strings.nix#L257
  85   stringToCharacters = s: map (p: builtins.substring p 1 s) (range 0 (builtins.stringLength s - 1));
  86
  87   # https://github.com/NixOS/nixpkgs/blob/0258808f5744ca980b9a1f24fe0b1e6f0fecee9c/lib/strings.nix#L269
  88   stringAsChars = f: s: concatStrings (map f (stringToCharacters s));
  89   concatStrings = builtins.concatStringsSep "";
  90
  91   # fetchTarball version that is compatible between all the versions of Nix
  92   builtins_fetchTarball = { url, name, sha256 }@attrs:
  93     let
  94       inherit (builtins) lessThan nixVersion fetchTarball;
  95     in
  96       if lessThan nixVersion "1.12" then
  97         fetchTarball { inherit name url; }
  98       else
  99         fetchTarball attrs;
 100
 101   # fetchurl version that is compatible between all the versions of Nix
 102   builtins_fetchurl = { url, sha256 }@attrs:
 103     let
 104       inherit (builtins) lessThan nixVersion fetchurl;
 105     in
 106       if lessThan nixVersion "1.12" then
 107         fetchurl { inherit url; }
 108       else
 109         fetchurl attrs;
 110
 111   # Create the final "sources" from the config
 112   mkSources = config:
 113     mapAttrs (
 114       name: spec:
 115         if builtins.hasAttr "outPath" spec
 116         then abort
 117           "The values in sources.json should not have an 'outPath' attribute"
 118         else
 119           spec // { outPath = fetch config.pkgs name spec; }
 120     ) config.sources;
 121
 122   # The "config" used by the fetchers
 123   mkConfig =
 124     { sourcesFile ? ./sources.json
 125     , sources ? builtins.fromJSON (builtins.readFile sourcesFile)
 126     , pkgs ? mkPkgs sources
 127     }: rec {
 128       # The sources, i.e. the attribute set of spec name to spec
 129       inherit sources;
 130
 131       # The "pkgs" (evaluated nixpkgs) to use for e.g. non-builtin fetchers
 132       inherit pkgs;
 133     };
 134 in
 135 mkSources (mkConfig {}) // { __functor = _: settings: mkSources (mkConfig settings); }