Fix runfiles resolution in libraries installed by bundle_install

Author: yugui

ruby/private/BUILD.host_runtime.tpl

@@ -12,7 +12,7 @@ ruby_toolchain(
     bundler = "//:bundler",
     init_files = ["//:init_loadpath"],
     rubyopt = [
-        "-I../org_ruby_lang_ruby_host/bundler/lib",
+        "-I$(RUNFILES_DIR)/org_ruby_lang_ruby_host/bundler/lib",
     ],
     runtime = "//:runtime",
     rules_ruby_workspace = "{rules_ruby_workspace}",

ruby/private/binary_wrapper.tpl

@@ -107,7 +107,16 @@ def main(args)
 
   main = {main}
   main = File.join(runfiles, main)
-  rubyopt = {rubyopt}
+  rubyopt = {rubyopt}.map do |opt|
+    opt.gsub(/\${(.+?)}/o) do
+      case $1
+      when 'RUNFILES_DIR'
+        runfiles
+      else
+        ENV[$1]
+      end
+    end
+  end
   exec(ruby_program, '--disable-gems', *rubyopt, main, *args)
   # TODO(yugui) Support windows
 end

ruby/private/bundle/create_bundle_build_file.rb

@@ -30,7 +30,7 @@
     exclude = {exclude},
   ),
   deps = [":bundler_setup"],
-  rubyopt = ["-r../{repo_name}/lib/bundler/setup.rb"],
+  rubyopt = ["-r${RUNFILES_DIR}/{repo_name}/lib/bundler/setup.rb"],
 )
 
 # PULL EACH GEM INDIVIDUALLY
@@ -48,7 +48,7 @@
     exclude = {exclude},
   ),
   deps = {deps},
-  rubyopt = ["-r../{repo_name}/lib/bundler/setup.rb"],
+  rubyopt = ["-r${RUNFILES_DIR}/{repo_name}/lib/bundler/setup.rb"],
 )
 
 '
@@ -57,7 +57,7 @@
 ruby_library(
   name = "all",
   deps = {deps},
-  rubyopt = ["-r../{repo_name}/lib/bundler/setup.rb"],
+  rubyopt = ["-r${RUNFILES_DIR}/{repo_name}/lib/bundler/setup.rb"],
 )
 '
 require "bundler"