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Refactor fetchers
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nix/sources.nix
123
nix/sources.nix
@ -1,6 +1,57 @@
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# This file has been generated by Niv.
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let
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#
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# The fetchers. fetch_<type> fetches specs of type <type>.
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#
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fetch_file = spec:
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if spec.builtin or true then
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builtins_fetchurl { inherit (spec) url sha256; }
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else
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pkgs.fetchurl { inherit (spec) url sha256; };
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fetch_tarball = spec:
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if spec.builtin or true then
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builtins_fetchTarball { inherit (spec) url sha256; }
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else
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pkgs.fetchzip { inherit (spec) url sha256; };
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fetch_builtin-tarball = spec:
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builtins.trace
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''
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WARNING:
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The niv type "builtin-tarball" will soon be deprecated. You should
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instead use `builtin = true`.
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$ niv modify <package> -a type=tarball -a builtins=true
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'' # TODO: attribute as JSON
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builtins_fetchTarball { inherit (spec) url sha256; };
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fetch_builtin-url = spec:
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builtins.trace
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''
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WARNING:
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The niv type "builtin-url" will soon be deprecated. You should
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instead use `builtin = true`.
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$ niv modify <package> -a type=file -a builtins=true
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'' # TODO: attribute as JSON
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(builtins_fetchurl { inherit (spec) url sha256; });
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#
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# The sources to fetch.
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#
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sources = builtins.fromJSON (builtins.readFile ./sources.json);
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#
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# Various helpers
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#
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# The set of packages used when specs are fetched using non-builtins.
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pkgs =
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if hasNixpkgsPath
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then
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@ -19,6 +70,30 @@ let
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add a package called "nixpkgs" to your sources.json.
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'';
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hasNixpkgsPath = (builtins.tryEval <nixpkgs>).success;
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hasThisAsNixpkgsPath =
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(builtins.tryEval <nixpkgs>).success && <nixpkgs> == ./.;
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# The actual fetching function.
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fetch = name: spec:
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if ! builtins.hasAttr "type" spec then
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abort "ERROR: niv spec ${name} does not have a 'type' attribute"
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else if spec.type == "file" then fetch_file spec
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else if spec.type == "tarball" then fetch_tarball spec
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else if spec.type == "builtin-tarball" then fetch_builtin-tarball spec
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else if spec.type == "builtin-url" then fetch_builtin-url spec
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else
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abort "ERROR: niv spec ${name} has unknown type ${builtins.fromJSON spec.type}";
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# Ports of functions for previous nix versions
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# a Nix version of mapAttrs if the built-in doesn't exist
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mapAttrs = builtins.mapAttrs or (
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f: set: with builtins;
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listToAttrs (map (attr: { name = attr; value = f attr set.${attr}; }) (attrNames set))
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);
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# fetchTarball version that is compatible between all the versions of Nix
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builtins_fetchTarball = { url, sha256 }@attrs:
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let
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@ -39,56 +114,12 @@ let
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else
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fetchurl attrs;
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# A wrapper around pkgs.fetchzip that has inspectable arguments,
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# annoyingly this means we have to specify them
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fetchzip = { url, sha256 }@attrs: pkgs.fetchzip attrs;
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# A wrapper around pkgs.fetchurl that has inspectable arguments,
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# annoyingly this means we have to specify them
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fetchurl = { url, sha256 }@attrs: pkgs.fetchurl attrs;
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hasNixpkgsPath = (builtins.tryEval <nixpkgs>).success;
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hasThisAsNixpkgsPath =
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(builtins.tryEval <nixpkgs>).success && <nixpkgs> == ./.;
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sources = builtins.fromJSON (builtins.readFile ./sources.json);
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mapAttrs = builtins.mapAttrs or (
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f: set: with builtins;
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listToAttrs (map (attr: { name = attr; value = f attr set.${attr}; }) (attrNames set))
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);
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# borrowed from nixpkgs
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functionArgs = f: f.__functionArgs or (builtins.functionArgs f);
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callFunctionWith = autoArgs: f: args:
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let
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auto = builtins.intersectAttrs (functionArgs f) autoArgs;
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in
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f (auto // args);
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getFetcher = spec:
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let
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fetcherName =
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if builtins.hasAttr "type" spec
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then builtins.getAttr "type" spec
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else "builtin-tarball";
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in
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builtins.getAttr fetcherName {
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"tarball" = fetchzip;
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"builtin-tarball" = builtins_fetchTarball;
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"file" = fetchurl;
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"builtin-url" = builtins_fetchurl;
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};
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in
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# NOTE: spec must _not_ have an "outPath" attribute
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mapAttrs (
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_: spec:
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name: spec:
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if builtins.hasAttr "outPath" spec
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then abort
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"The values in sources.json should not have an 'outPath' attribute"
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else
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if builtins.hasAttr "url" spec && builtins.hasAttr "sha256" spec
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then
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spec // { outPath = callFunctionWith spec (getFetcher spec) {}; }
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else spec
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spec // { outPath = fetch name spec; }
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) sources
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