242 lines
6.9 KiB
Nix
242 lines
6.9 KiB
Nix
# This builds gems in a way that is compatible with bundler.
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#
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# Bundler installs gems from git sources _very_ differently from how RubyGems
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# installes gem packages, though they both install gem packages similarly.
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#
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# We monkey-patch Bundler to remove any impurities and then drive its internals
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# to install git gems.
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#
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# For the sake of simplicity, gem packages are installed with the standard `gem`
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# program.
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#
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# Note that bundler does not support multiple prefixes; it assumes that all
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# gems are installed in a common prefix, and has no support for specifying
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# otherwise. Therefore, if you want to be able to use the resulting derivations
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# with bundler, you need to create a symlink forrest first, which is what
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# `bundlerEnv` does for you.
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#
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# Normal gem packages can be used outside of bundler; a binstub is created in
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# $out/bin.
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{ lib, fetchurl, fetchgit, makeWrapper, git, darwin
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, ruby, bundler
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} @ defs:
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lib.makeOverridable (
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{ name ? null
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, gemName
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, version ? null
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, type ? "gem"
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, document ? [] # e.g. [ "ri" "rdoc" ]
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, platform ? "ruby"
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, ruby ? defs.ruby
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, stdenv ? ruby.stdenv
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, namePrefix ? (let
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rubyName = builtins.parseDrvName ruby.name;
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in "${rubyName.name}${rubyName.version}-")
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, buildInputs ? []
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, meta ? {}
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, patches ? []
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, gemPath ? []
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, dontStrip ? false
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# Assume we don't have to build unless strictly necessary (e.g. the source is a
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# git checkout).
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# If you need to apply patches, make sure to set `dontBuild = false`;
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, dontBuild ? true
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, dontInstallManpages ? false
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, propagatedBuildInputs ? []
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, propagatedUserEnvPkgs ? []
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, buildFlags ? []
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, passthru ? {}
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# bundler expects gems to be stored in the cache directory for certain actions
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# such as `bundler install --redownload`.
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# At the cost of increasing the store size, you can keep the gems to have closer
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# alignment with what Bundler expects.
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, keepGemCache ? false
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, ...} @ attrs:
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let
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src = attrs.src or (
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if type == "gem" then
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fetchurl {
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urls = map (
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remote: "${remote}/gems/${gemName}-${version}.gem"
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) (attrs.source.remotes or [ "https://rubygems.org" ]);
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inherit (attrs.source) sha256;
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}
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else if type == "git" then
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fetchgit {
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inherit (attrs.source) url rev sha256 fetchSubmodules;
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}
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else if type == "url" then
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fetchurl attrs.source
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else
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throw "buildRubyGem: don't know how to build a gem of type \"${type}\""
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);
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documentFlag =
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if document == []
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then "-N"
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else "--document ${lib.concatStringsSep "," document}";
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in
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stdenv.mkDerivation ((builtins.removeAttrs attrs ["source"]) // {
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inherit ruby;
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inherit dontBuild;
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inherit dontStrip;
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inherit type;
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buildInputs = [
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ruby makeWrapper
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] ++ lib.optionals (type == "git") [ git ]
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++ lib.optionals (type != "gem") [ bundler ]
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++ lib.optional stdenv.isDarwin darwin.libobjc
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++ buildInputs;
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#name = builtins.trace (attrs.name or "no attr.name" ) "${namePrefix}${gemName}-${version}";
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name = attrs.name or "${namePrefix}${gemName}-${version}";
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inherit src;
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unpackPhase = attrs.unpackPhase or ''
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runHook preUnpack
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if [[ -f $src && $src == *.gem ]]; then
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if [[ -z "''${dontBuild-}" ]]; then
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# we won't know the name of the directory that RubyGems creates,
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# so we'll just use a glob to find it and move it over.
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gempkg="$src"
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sourceRoot=source
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gem unpack $gempkg --target=container
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cp -r container/* $sourceRoot
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rm -r container
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# copy out the original gemspec, for convenience during patching /
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# overrides.
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gem specification $gempkg --ruby > original.gemspec
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gemspec=$(readlink -f .)/original.gemspec
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else
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gempkg="$src"
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fi
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else
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# Fall back to the original thing for everything else.
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dontBuild=""
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preUnpack="" postUnpack="" unpackPhase
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fi
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runHook postUnpack
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'';
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buildPhase = attrs.buildPhase or ''
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runHook preBuild
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if [[ "$type" == "gem" ]]; then
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if [[ -z "$gemspec" ]]; then
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gemspec="$(find . -name '*.gemspec')"
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echo "found the following gemspecs:"
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echo "$gemspec"
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gemspec="$(echo "$gemspec" | head -n1)"
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fi
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exec 3>&1
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output="$(gem build $gemspec | tee >(cat - >&3))"
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exec 3>&-
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gempkg=$(echo "$output" | grep -oP 'File: \K(.*)')
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echo "gem package built: $gempkg"
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elif [[ "$type" == "git" ]]; then
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git init
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# remove variations to improve the likelihood of a bit-reproducible output
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rm -rf .git/logs/ .git/hooks/ .git/index .git/FETCH_HEAD .git/ORIG_HEAD .git/refs/remotes/origin/HEAD .git/config
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# support `git ls-files`
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git add .
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fi
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runHook postBuild
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'';
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# Note:
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# We really do need to keep the $out/${ruby.gemPath}/cache.
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# This is very important in order for many parts of RubyGems/Bundler to not blow up.
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# See https://github.com/bundler/bundler/issues/3327
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installPhase = attrs.installPhase or ''
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runHook preInstall
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export GEM_HOME=$out/${ruby.gemPath}
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mkdir -p $GEM_HOME
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echo "buildFlags: $buildFlags"
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${lib.optionalString (type == "url") ''
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ruby ${./nix-bundle-install.rb} \
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"path" \
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'${gemName}' \
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'${version}' \
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'${lib.escapeShellArgs buildFlags}'
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''}
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${lib.optionalString (type == "git") ''
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ruby ${./nix-bundle-install.rb} \
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"git" \
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'${gemName}' \
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'${version}' \
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'${lib.escapeShellArgs buildFlags}' \
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'${attrs.source.url}' \
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'.' \
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'${attrs.source.rev}'
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''}
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${lib.optionalString (type == "gem") ''
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if [[ -z "$gempkg" ]]; then
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echo "failure: \$gempkg path unspecified" 1>&2
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exit 1
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elif [[ ! -f "$gempkg" ]]; then
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echo "failure: \$gempkg path invalid" 1>&2
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exit 1
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fi
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gem install \
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--local \
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--force \
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--http-proxy 'http://nodtd.invalid' \
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--ignore-dependencies \
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--install-dir "$GEM_HOME" \
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--build-root '/' \
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--backtrace \
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--no-env-shebang \
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${documentFlag} \
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$gempkg $gemFlags -- $buildFlags
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# looks like useless files which break build repeatability and consume space
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pushd $out/${ruby.gemPath}
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rm -fv doc/*/*/created.rid || true
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rm -fv {gems/*/ext/*,extensions/*/*/*}/{Makefile,mkmf.log,gem_make.out} || true
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${if keepGemCache then "" else "rm -fvr cache"}
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popd
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# write out metadata and binstubs
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spec=$(echo $out/${ruby.gemPath}/specifications/*.gemspec)
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ruby ${./gem-post-build.rb} "$spec"
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''}
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${lib.optionalString (!dontInstallManpages) ''
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for section in {1..9}; do
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mandir="$out/share/man/man$section"
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find $out/lib \( -wholename "*/man/*.$section" -o -wholename "*/man/man$section/*.$section" \) \
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-execdir mkdir -p $mandir \; -execdir cp '{}' $mandir \;
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done
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''}
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runHook postInstall
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'';
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propagatedBuildInputs = gemPath ++ propagatedBuildInputs;
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propagatedUserEnvPkgs = gemPath ++ propagatedUserEnvPkgs;
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passthru = passthru // { isRubyGem = true; };
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inherit meta;
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})
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)
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