Starting decomposition of bundlerEnv

1 files changed, 134 insertions, 0 deletions

diff --git a/pkgs/development/ruby-modules/bundler-env/basic.nix b/pkgs/development/ruby-modules/bundler-env/basic.nix
new file mode 100644
index 00000000000..705c8dabd63
--- /dev/null
+++ b/pkgs/development/ruby-modules/bundler-env/basic.nix
@@ -0,0 +1,134 @@
+{ stdenv, runCommand, ruby, lib
+, defaultGemConfig, buildRubyGem, buildEnv
+, makeWrapper
+, bundler
+}@defs:
+
+{
+  drvName
+, pname
+, gemfile
+, lockfile
+, gemset
+, ruby ? defs.ruby
+, gemConfig ? defaultGemConfig
+, postBuild ? null
+, document ? []
+, meta ? {}
+, groups ? ["default"]
+, ignoreCollisions ? false
+, ...
+}@args:
+
+with (import ./functions.nix);
+
+let
+  mainGem = gems."${pname}" or (throw "bundlerEnv: gem ${pname} not found");
+
+  importedGemset = import gemset;
+
+  filteredGemset = lib.filterAttrs (name: attrs: platformMatches attrs && groupMatches attrs) importedGemset;
+
+  configuredGemset = lib.flip lib.mapAttrs filteredGemset (name: attrs:
+    applyGemConfigs (attrs // { inherit ruby; gemName = name; })
+  );
+
+  hasBundler = builtins.hasAttr "bundler" filteredGemset;
+
+  bundler =
+    if hasBundler then gems.bundler
+    else defs.bundler.override (attrs: { inherit ruby; });
+
+  gems = lib.flip lib.mapAttrs configuredGemset (name: attrs: buildGem name attrs);
+
+  copyIfBundledByPath = { bundledByPath ? false, ...}@main:
+  (if bundledByPath then ''
+  cp -a ${gemdir}/* $out/
+  '' else ""
+  );
+
+  maybeCopyAll = main: if main == null then "" else copyIfBundledByPath main;
+
+  # We have to normalize the Gemfile.lock, otherwise bundler tries to be
+  # helpful by doing so at run time, causing executables to immediately bail
+  # out. Yes, I'm serious.
+  confFiles = runCommand "gemfile-and-lockfile" {} ''
+    mkdir -p $out
+    ${maybeCopyAll mainGem}
+    cp ${gemfile} $out/Gemfile || ls -l $out/Gemfile
+    cp ${lockfile} $out/Gemfile.lock || ls -l $out/Gemfile.lock
+  '';
+
+  buildGem = name: attrs: (
+    let
+      gemAttrs = composeGemAttrs gems name attrs;
+    in
+    if gemAttrs.type == "path" then
+      pathDerivation gemAttrs
+    else
+      buildRubyGem gemAttrs
+  );
+
+  envPaths = lib.attrValues gems ++ lib.optional (!hasBundler) bundler;
+
+  # binPaths = if mainGem != null then [ mainGem ] else envPaths;
+
+in
+  buildEnv {
+    inherit ignoreCollisions;
+
+    name = drvName;
+
+    paths = envPaths;
+    pathsToLink = [ "/lib" ];
+
+    postBuild = genStubsScript defs // args // {
+      inherit confFiles bundler;
+      binPaths = envPaths;
+    } + lib.optionalString (postBuild != null) postBuild;
+
+    meta = { platforms = ruby.meta.platforms; } // meta;
+
+    passthru = rec {
+      inherit ruby bundler gems;
+
+      wrappedRuby = stdenv.mkDerivation {
+        name = "wrapped-ruby-${drvName}";
+        nativeBuildInputs = [ makeWrapper ];
+        buildCommand = ''
+          mkdir -p $out/bin
+          for i in ${ruby}/bin/*; do
+            makeWrapper "$i" $out/bin/$(basename "$i") \
+              --set BUNDLE_GEMFILE ${confFiles}/Gemfile \
+              --set BUNDLE_PATH ${bundlerEnv}/${ruby.gemPath} \
+              --set BUNDLE_FROZEN 1 \
+              --set GEM_HOME ${bundlerEnv}/${ruby.gemPath} \
+              --set GEM_PATH ${bundlerEnv}/${ruby.gemPath}
+          done
+        '';
+      };
+
+      env = let
+        irbrc = builtins.toFile "irbrc" ''
+          if !(ENV["OLD_IRBRC"].nil? || ENV["OLD_IRBRC"].empty?)
+            require ENV["OLD_IRBRC"]
+          end
+          require 'rubygems'
+          require 'bundler/setup'
+        '';
+        in stdenv.mkDerivation {
+          name = "${drvName}-interactive-environment";
+          nativeBuildInputs = [ wrappedRuby bundlerEnv ];
+          shellHook = ''
+            export OLD_IRBRC="$IRBRC"
+            export IRBRC=${irbrc}
+          '';
+          buildCommand = ''
+            echo >&2 ""
+            echo >&2 "*** Ruby 'env' attributes are intended for interactive nix-shell sessions, not for building! ***"
+            echo >&2 ""
+            exit 1
+          '';
+        };
+    };
+  }