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-rw-r--r--pkgs/development/ruby-modules/bundled-common/default.nix9
-rw-r--r--pkgs/development/ruby-modules/bundled-common/functions.nix2
-rw-r--r--pkgs/development/ruby-modules/bundler-env/default.nix2
-rw-r--r--pkgs/development/ruby-modules/tool/default.nix13
4 files changed, 19 insertions, 7 deletions
diff --git a/pkgs/development/ruby-modules/bundled-common/default.nix b/pkgs/development/ruby-modules/bundled-common/default.nix
index 2aea35844fe5..354353ffab11 100644
--- a/pkgs/development/ruby-modules/bundled-common/default.nix
+++ b/pkgs/development/ruby-modules/bundled-common/default.nix
@@ -7,6 +7,7 @@
 {
   name
 , pname ? name
+, mainGemName ? null
 , gemdir ? null
 , gemfile ? null
 , lockfile ? null
@@ -44,13 +45,13 @@ let
 
   copyIfBundledByPath = { bundledByPath ? false, ...}@main:
   (if bundledByPath then
-      assert gemFiles.gemdir != nil; "cp -a ${gemFiles.gemdir}/* $out/"
+      assert gemFiles.gemdir != null; "cp -a ${gemFiles.gemdir}/* $out/"
     else ""
   );
 
-  maybeCopyAll = pname: if pname == null then "" else
+  maybeCopyAll = pkgname: if pkgname == null then "" else
   let
-    mainGem = gems."${pname}" or (throw "bundlerEnv: gem ${pname} not found");
+    mainGem = gems."${pkgname}" or (throw "bundlerEnv: gem ${pkgname} not found");
   in
     copyIfBundledByPath mainGem;
 
@@ -59,7 +60,7 @@ let
   # out. Yes, I'm serious.
   confFiles = runCommand "gemfile-and-lockfile" {} ''
     mkdir -p $out
-    ${maybeCopyAll pname}
+    ${maybeCopyAll mainGemName}
     cp ${gemFiles.gemfile} $out/Gemfile || ls -l $out/Gemfile
     cp ${gemFiles.lockfile} $out/Gemfile.lock || ls -l $out/Gemfile.lock
   '';
diff --git a/pkgs/development/ruby-modules/bundled-common/functions.nix b/pkgs/development/ruby-modules/bundled-common/functions.nix
index 1d7c4878e13b..b17a4639e779 100644
--- a/pkgs/development/ruby-modules/bundled-common/functions.nix
+++ b/pkgs/development/ruby-modules/bundled-common/functions.nix
@@ -7,6 +7,8 @@ rec {
   , gemdir ? null
   , ...
   }: {
+    inherit gemdir;
+
     gemfile =
     if gemfile == null then assert gemdir != null; gemdir + "/Gemfile"
     else gemfile;
diff --git a/pkgs/development/ruby-modules/bundler-env/default.nix b/pkgs/development/ruby-modules/bundler-env/default.nix
index a72647fb00a1..7d175cfeccb7 100644
--- a/pkgs/development/ruby-modules/bundler-env/default.nix
+++ b/pkgs/development/ruby-modules/bundler-env/default.nix
@@ -27,7 +27,7 @@ let
     else if pname != null then "${toString pname}-${basicEnv.gems."${pname}".version}"
     else throw "bundlerEnv: either pname or name must be set";
 
-  basicEnv = (callPackage ../bundled-common {}) (args // { inherit pname name; });
+  basicEnv = (callPackage ../bundled-common {}) (args // { inherit pname name; mainGemName = pname; });
 
   inherit (basicEnv) envPaths;
   # Idea here is a mkDerivation that gen-bin-stubs new stubs "as specified" -
diff --git a/pkgs/development/ruby-modules/tool/default.nix b/pkgs/development/ruby-modules/tool/default.nix
index 9b8848592b2c..a5308b79ff3d 100644
--- a/pkgs/development/ruby-modules/tool/default.nix
+++ b/pkgs/development/ruby-modules/tool/default.nix
@@ -1,5 +1,14 @@
 { lib, stdenv, callPackage, runCommand, ruby }@defs:
 
+# Use for simple installation of Ruby tools shipped in a Gem.
+# Start with a Gemfile that includes `gem <toolgem>`
+# > nix-shell -p bundler bundix
+# (shell)> bundle lock
+# (shell)> bundix
+# Then use rubyTool in the default.nix:
+
+# rubyTool { name = "gemifiedTool"; gemdir = ./.; exes = ["gemified-tool"]; }
+# The 'exes' parameter ensures that a copy of e.g. rake doesn't polute the system.
 {
   name
   # gemdir is the location of the Gemfile{,.lock} and gemset.nix; usually ./.
@@ -25,8 +34,8 @@ let
   // { inherit preferLocalBuild allowSubstitutes; }; # pass the defaults
 in
    runCommand name cmdArgs ''
-    mkdir -p $out/bin; cd $out;
-      ${(lib.concatMapStrings (x: "ln -s '${basicEnv}/bin/${x}' '${x}';\n") exes)}
+    mkdir -p $out/bin;
+      ${(lib.concatMapStrings (x: "ln -s '${basicEnv}/bin/${x}' $out/bin/${x};\n") exes)}
       ${(lib.concatMapStrings (s: "makeWrapper $out/bin/$(basename ${s}) $srcdir/${s} " +
               "--set BUNDLE_GEMFILE ${basicEnv.confFiles}/Gemfile "+
               "--set BUNDLE_PATH ${basicEnv}/${ruby.gemPath} "+