sources.nix
7316 bytes
1# This file has been generated by Niv.
2
3let
4
5 #
6 # The fetchers. fetch_<type> fetches specs of type <type>.
7 #
8
9 fetch_file = pkgs: name: spec:
10 let
11 name' = sanitizeName name + "-src";
12 in
13 if spec.builtin or true then
14 builtins_fetchurl { inherit (spec) url sha256; name = name'; }
15 else
16 pkgs.fetchurl { inherit (spec) url sha256; name = name'; };
17
18 fetch_tarball = pkgs: name: spec:
19 let
20 name' = sanitizeName name + "-src";
21 in
22 if spec.builtin or true then
23 builtins_fetchTarball { name = name'; inherit (spec) url sha256; }
24 else
25 pkgs.fetchzip { name = name'; inherit (spec) url sha256; };
26
27 fetch_git = name: spec:
28 let
29 ref =
30 spec.ref or (
31 if spec ? branch then "refs/heads/${spec.branch}" else
32 if spec ? tag then "refs/tags/${spec.tag}" else
33 abort "In git source '${name}': Please specify `ref`, `tag` or `branch`!"
34 );
35 submodules = spec.submodules or false;
36 submoduleArg =
37 let
38 nixSupportsSubmodules = builtins.compareVersions builtins.nixVersion "2.4" >= 0;
39 emptyArgWithWarning =
40 if submodules
41 then
42 builtins.trace
43 (
44 "The niv input \"${name}\" uses submodules "
45 + "but your nix's (${builtins.nixVersion}) builtins.fetchGit "
46 + "does not support them"
47 )
48 { }
49 else { };
50 in
51 if nixSupportsSubmodules
52 then { inherit submodules; }
53 else emptyArgWithWarning;
54 in
55 builtins.fetchGit
56 ({ url = spec.repo; inherit (spec) rev; inherit ref; } // submoduleArg);
57
58 fetch_local = spec: spec.path;
59
60 fetch_builtin-tarball = name: throw
61 ''[${name}] The niv type "builtin-tarball" is deprecated. You should instead use `builtin = true`.
62 $ niv modify ${name} -a type=tarball -a builtin=true'';
63
64 fetch_builtin-url = name: throw
65 ''[${name}] The niv type "builtin-url" will soon be deprecated. You should instead use `builtin = true`.
66 $ niv modify ${name} -a type=file -a builtin=true'';
67
68 #
69 # Various helpers
70 #
71
72 # https://github.com/NixOS/nixpkgs/pull/83241/files#diff-c6f540a4f3bfa4b0e8b6bafd4cd54e8bR695
73 sanitizeName = name:
74 (
75 concatMapStrings (s: if builtins.isList s then "-" else s)
76 (
77 builtins.split "[^[:alnum:]+._?=-]+"
78 ((x: builtins.elemAt (builtins.match "\\.*(.*)" x) 0) name)
79 )
80 );
81
82 # The set of packages used when specs are fetched using non-builtins.
83 mkPkgs = sources: system:
84 let
85 sourcesNixpkgs =
86 import (builtins_fetchTarball { inherit (sources.nixpkgs) url sha256; }) { inherit system; };
87 hasNixpkgsPath = builtins.any (x: x.prefix == "nixpkgs") builtins.nixPath;
88 hasThisAsNixpkgsPath = <nixpkgs> == ./.;
89 in
90 if builtins.hasAttr "nixpkgs" sources
91 then sourcesNixpkgs
92 else if hasNixpkgsPath && ! hasThisAsNixpkgsPath then
93 import <nixpkgs> { }
94 else
95 abort
96 ''
97 Please specify either <nixpkgs> (through -I or NIX_PATH=nixpkgs=...) or
98 add a package called "nixpkgs" to your sources.json.
99 '';
100
101 # The actual fetching function.
102 fetch = pkgs: name: spec:
103
104 if ! builtins.hasAttr "type" spec then
105 abort "ERROR: niv spec ${name} does not have a 'type' attribute"
106 else if spec.type == "file" then fetch_file pkgs name spec
107 else if spec.type == "tarball" then fetch_tarball pkgs name spec
108 else if spec.type == "git" then fetch_git name spec
109 else if spec.type == "local" then fetch_local spec
110 else if spec.type == "builtin-tarball" then fetch_builtin-tarball name
111 else if spec.type == "builtin-url" then fetch_builtin-url name
112 else
113 abort "ERROR: niv spec ${name} has unknown type ${builtins.toJSON spec.type}";
114
115 # If the environment variable NIV_OVERRIDE_${name} is set, then use
116 # the path directly as opposed to the fetched source.
117 replace = name: drv:
118 let
119 saneName = stringAsChars (c: if (builtins.match "[a-zA-Z0-9]" c) == null then "_" else c) name;
120 ersatz = builtins.getEnv "NIV_OVERRIDE_${saneName}";
121 in
122 if ersatz == "" then drv else
123 # this turns the string into an actual Nix path (for both absolute and
124 # relative paths)
125 if builtins.substring 0 1 ersatz == "/" then /. + ersatz else /. + builtins.getEnv "PWD" + "/${ersatz}";
126
127 # Ports of functions for older nix versions
128
129 # a Nix version of mapAttrs if the built-in doesn't exist
130 mapAttrs = builtins.mapAttrs or (
131 f: set: with builtins;
132 listToAttrs (map (attr: { name = attr; value = f attr set.${attr}; }) (attrNames set))
133 );
134
135 # https://github.com/NixOS/nixpkgs/blob/0258808f5744ca980b9a1f24fe0b1e6f0fecee9c/lib/lists.nix#L295
136 range = first: last: if first > last then [ ] else builtins.genList (n: first + n) (last - first + 1);
137
138 # https://github.com/NixOS/nixpkgs/blob/0258808f5744ca980b9a1f24fe0b1e6f0fecee9c/lib/strings.nix#L257
139 stringToCharacters = s: map (p: builtins.substring p 1 s) (range 0 (builtins.stringLength s - 1));
140
141 # https://github.com/NixOS/nixpkgs/blob/0258808f5744ca980b9a1f24fe0b1e6f0fecee9c/lib/strings.nix#L269
142 stringAsChars = f: s: concatStrings (map f (stringToCharacters s));
143 concatMapStrings = f: list: concatStrings (map f list);
144 concatStrings = builtins.concatStringsSep "";
145
146 # https://github.com/NixOS/nixpkgs/blob/8a9f58a375c401b96da862d969f66429def1d118/lib/attrsets.nix#L331
147 optionalAttrs = cond: as: if cond then as else { };
148
149 # fetchTarball version that is compatible between all the versions of Nix
150 builtins_fetchTarball = { url, name ? null, sha256 }@attrs:
151 let
152 inherit (builtins) lessThan nixVersion fetchTarball;
153 in
154 if lessThan nixVersion "1.12" then
155 fetchTarball ({ inherit url; } // (optionalAttrs (name != null) { inherit name; }))
156 else
157 fetchTarball attrs;
158
159 # fetchurl version that is compatible between all the versions of Nix
160 builtins_fetchurl = { url, name ? null, sha256 }@attrs:
161 let
162 inherit (builtins) lessThan nixVersion fetchurl;
163 in
164 if lessThan nixVersion "1.12" then
165 fetchurl ({ inherit url; } // (optionalAttrs (name != null) { inherit name; }))
166 else
167 fetchurl attrs;
168
169 # Create the final "sources" from the config
170 mkSources = config:
171 mapAttrs
172 (
173 name: spec:
174 if builtins.hasAttr "outPath" spec
175 then
176 abort
177 "The values in sources.json should not have an 'outPath' attribute"
178 else
179 spec // { outPath = replace name (fetch config.pkgs name spec); }
180 )
181 config.sources;
182
183 # The "config" used by the fetchers
184 mkConfig =
185 { sourcesFile ? if builtins.pathExists ./sources.json then ./sources.json else null
186 , sources ? if sourcesFile == null then { } else builtins.fromJSON (builtins.readFile sourcesFile)
187 , system ? builtins.currentSystem
188 , pkgs ? mkPkgs sources system
189 }: rec {
190 # The sources, i.e. the attribute set of spec name to spec
191 inherit sources;
192
193 # The "pkgs" (evaluated nixpkgs) to use for e.g. non-builtin fetchers
194 inherit pkgs;
195 };
196
197in
198mkSources (mkConfig { }) // { __functor = _: settings: mkSources (mkConfig settings); }