nix-helpers: 9f418ad3f37833c04ccf6d26b87a20d5e9c09844
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: name: spec:
10: let name' = sanitizeName name + "-src";
11: in if spec.builtin or true then
12: builtins_fetchurl {
13: inherit (spec) url sha256;
14: name = name';
15: }
16: else
17: pkgs.fetchurl {
18: inherit (spec) url sha256;
19: name = name';
20: };
21:
22: fetch_tarball = pkgs: name: spec:
23: let name' = sanitizeName name + "-src";
24: in if spec.builtin or true then
25: builtins_fetchTarball {
26: name = name';
27: inherit (spec) url sha256;
28: }
29: else
30: pkgs.fetchzip {
31: name = name';
32: inherit (spec) url sha256;
33: };
34:
35: fetch_git = name: spec:
36: let
37: ref = if spec ? ref then
38: spec.ref
39: else if spec ? branch then
40: "refs/heads/${spec.branch}"
41: else if spec ? tag then
42: "refs/tags/${spec.tag}"
43: else
44: abort
45: "In git source '${name}': Please specify `ref`, `tag` or `branch`!";
46: in builtins.fetchGit {
47: url = spec.repo;
48: inherit (spec) rev;
49: inherit ref;
50: };
51:
52: fetch_local = spec: spec.path;
53:
54: fetch_builtin-tarball = name:
55: throw ''
56: [${name}] The niv type "builtin-tarball" is deprecated. You should instead use `builtin = true`.
57: $ niv modify ${name} -a type=tarball -a builtin=true'';
58:
59: fetch_builtin-url = name:
60: throw ''
61: [${name}] The niv type "builtin-url" will soon be deprecated. You should instead use `builtin = true`.
62: $ niv modify ${name} -a type=file -a builtin=true'';
63:
64: #
65: # Various helpers
66: #
67:
68: # https://github.com/NixOS/nixpkgs/pull/83241/files#diff-c6f540a4f3bfa4b0e8b6bafd4cd54e8bR695
69: sanitizeName = name:
70: (concatMapStrings (s: if builtins.isList s then "-" else s)
71: (builtins.split "[^[:alnum:]+._?=-]+"
72: ((x: builtins.elemAt (builtins.match "\\.*(.*)" x) 0) name)));
73:
74: # The set of packages used when specs are fetched using non-builtins.
75: mkPkgs = sources: system:
76: let
77: sourcesNixpkgs = import
78: (builtins_fetchTarball { inherit (sources.nixpkgs) url sha256; }) {
79: inherit system;
80: };
81: hasNixpkgsPath = builtins.any (x: x.prefix == "nixpkgs") builtins.nixPath;
82: hasThisAsNixpkgsPath = <nixpkgs> == ./.;
83: in if builtins.hasAttr "nixpkgs" sources then
84: sourcesNixpkgs
85: else if hasNixpkgsPath && !hasThisAsNixpkgsPath then
86: import <nixpkgs> { }
87: else
88: abort ''
89: Please specify either <nixpkgs> (through -I or NIX_PATH=nixpkgs=...) or
90: add a package called "nixpkgs" to your sources.json.
91: '';
92:
93: # The actual fetching function.
94: fetch = pkgs: name: spec:
95:
96: if !builtins.hasAttr "type" spec then
97: abort "ERROR: niv spec ${name} does not have a 'type' attribute"
98: else if spec.type == "file" then
99: fetch_file pkgs name spec
100: else if spec.type == "tarball" then
101: fetch_tarball pkgs name spec
102: else if spec.type == "git" then
103: fetch_git name spec
104: else if spec.type == "local" then
105: fetch_local spec
106: else if spec.type == "builtin-tarball" then
107: fetch_builtin-tarball name
108: else if spec.type == "builtin-url" then
109: fetch_builtin-url name
110: else
111: abort
112: "ERROR: niv spec ${name} has unknown type ${builtins.toJSON spec.type}";
113:
114: # If the environment variable NIV_OVERRIDE_${name} is set, then use
115: # the path directly as opposed to the fetched source.
116: replace = name: drv:
117: let
118: saneName = stringAsChars
119: (c: if isNull (builtins.match "[a-zA-Z0-9]" c) then "_" else c) name;
120: ersatz = builtins.getEnv "NIV_OVERRIDE_${saneName}";
121: in if ersatz == "" then drv else ersatz;
122:
123: # Ports of functions for older nix versions
124:
125: # a Nix version of mapAttrs if the built-in doesn't exist
126: mapAttrs = builtins.mapAttrs or (f: set:
127: with builtins;
128: listToAttrs (map (attr: {
129: name = attr;
130: value = f attr set.${attr};
131: }) (attrNames set)));
132:
133: # https://github.com/NixOS/nixpkgs/blob/0258808f5744ca980b9a1f24fe0b1e6f0fecee9c/lib/lists.nix#L295
134: range = first: last:
135: if first > last then
136: [ ]
137: else
138: builtins.genList (n: first + n) (last - first + 1);
139:
140: # https://github.com/NixOS/nixpkgs/blob/0258808f5744ca980b9a1f24fe0b1e6f0fecee9c/lib/strings.nix#L257
141: stringToCharacters = s:
142: map (p: builtins.substring p 1 s) (range 0 (builtins.stringLength s - 1));
143:
144: # https://github.com/NixOS/nixpkgs/blob/0258808f5744ca980b9a1f24fe0b1e6f0fecee9c/lib/strings.nix#L269
145: stringAsChars = f: s: concatStrings (map f (stringToCharacters s));
146: concatMapStrings = f: list: concatStrings (map f list);
147: concatStrings = builtins.concatStringsSep "";
148:
149: # https://github.com/NixOS/nixpkgs/blob/8a9f58a375c401b96da862d969f66429def1d118/lib/attrsets.nix#L331
150: optionalAttrs = cond: as: if cond then as else { };
151:
152: # fetchTarball version that is compatible between all the versions of Nix
153: builtins_fetchTarball = { url, name ? null, sha256 }@attrs:
154: let inherit (builtins) lessThan nixVersion fetchTarball;
155: in if lessThan nixVersion "1.12" then
156: fetchTarball
157: ({ inherit url; } // (optionalAttrs (!isNull name) { inherit name; }))
158: else
159: fetchTarball attrs;
160:
161: # fetchurl version that is compatible between all the versions of Nix
162: builtins_fetchurl = { url, name ? null, sha256 }@attrs:
163: let inherit (builtins) lessThan nixVersion fetchurl;
164: in if lessThan nixVersion "1.12" then
165: fetchurl
166: ({ inherit url; } // (optionalAttrs (!isNull name) { inherit name; }))
167: else
168: fetchurl attrs;
169:
170: # Create the final "sources" from the config
171: mkSources = config:
172: mapAttrs (name: spec:
173: if builtins.hasAttr "outPath" spec then
174: abort
175: "The values in sources.json should not have an 'outPath' attribute"
176: else
177: spec // { outPath = replace name (fetch config.pkgs name spec); })
178: config.sources;
179:
180: # The "config" used by the fetchers
181: mkConfig = { sourcesFile ?
182: if builtins.pathExists ./sources.json then ./sources.json else null
183: , sources ? if isNull sourcesFile then
184: { }
185: else
186: builtins.fromJSON (builtins.readFile sourcesFile)
187: , system ? builtins.currentSystem, pkgs ? mkPkgs sources system }: rec {
188: # The sources, i.e. the attribute set of spec name to spec
189: inherit sources;
190:
191: # The "pkgs" (evaluated nixpkgs) to use for e.g. non-builtin fetchers
192: inherit pkgs;
193: };
194:
195: in mkSources (mkConfig { }) // {
196: __functor = _: settings: mkSources (mkConfig settings);
197: }
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