69 lines
1.9 KiB
Nix
69 lines
1.9 KiB
Nix
{ ruby, lib, callPackage, gemFixes, fetchurl, fetchgit, buildRubyGem }@defs:
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# This function builds a set of gems. You first convert your Gemfile to an attrset
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# called a "gemset", and then use this function to build the gemset.
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#
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# A gemset looks like the following:
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#
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# {
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# libv8 = {
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# version = "3.16.14.7";
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# src = {
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# type = "gem";
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# sha256 = "...";
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# };
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# };
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# therubyracer = {
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# version = "0.12.1";
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# dependencies = [ "libv8" ];
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# src = {
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# type = "gem";
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# sha256 = "...";
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# };
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# };
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# }
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#
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# If you use these gems as build inputs, the GEM_PATH will be updated
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# appropriately, and command like `bundle exec` should work out of the box.
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{ gemset, ruby ? defs.ruby, fixes ? gemFixes }@args:
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let
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const = x: y: x;
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fetchers.path = attrs: attrs.src.path;
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fetchers.gem = attrs: fetchurl {
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url = "${attrs.src.source or "https://rubygems.org"}/downloads/${attrs.name}-${attrs.version}.gem";
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inherit (attrs.src) sha256;
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};
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fetchers.git = attrs: fetchgit {
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inherit (attrs.src) url rev sha256 fetchSubmodules;
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leaveDotGit = true;
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};
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instantiate = (attrs:
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let
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defaultAttrs = {
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name = "${attrs.name}-${attrs.version}";
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inherit ruby gemPath;
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};
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gemPath = map (name: gemset''."${name}") (attrs.dependencies or []);
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fixedAttrs = attrs // (fixes."${attrs.name}" or (const {})) attrs;
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withSource = fixedAttrs //
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(if (lib.isDerivation fixedAttrs.src || builtins.isString fixedAttrs.src)
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then {}
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else { src = (fetchers."${fixedAttrs.src.type}" fixedAttrs); });
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in
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buildRubyGem (withSource // defaultAttrs)
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);
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gemset' = if builtins.isAttrs gemset then gemset else import gemset;
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gemset'' = lib.flip lib.mapAttrs gemset' (name: attrs:
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if (lib.isDerivation attrs)
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then attrs
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else instantiate (attrs // { inherit name; })
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);
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in gemset''
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