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