[rubygems/rubygems] Show a proper error if gem path is not writable

Instead of showing the bug report place with an error at a randome
place.

https://github.com/rubygems/rubygems/commit/241854ce73

2 files changed, 17 insertions, 3 deletions

diff --git a/lib/bundler/errors.rb b/lib/bundler/errors.rb
index 565aaeeb9d..59898cd252 100644
--- a/lib/bundler/errors.rb
+++ b/lib/bundler/errors.rb
@@ -75,10 +75,22 @@ module Bundler
       end
     end
 
+    def permission_type
+      case @permission_type
+      when :create
+        "executable permissions for all parent directories and write permissions for `#{parent_folder}`"
+      else
+        "#{@permission_type} permissions for that path"
+      end
+    end
+
+    def parent_folder
+      File.dirname(@path)
+    end
+
     def message
       "There was an error while trying to #{action} `#{@path}`. " \
-      "It is likely that you need to grant #{@permission_type} permissions " \
-      "for that path."
+      "It is likely that you need to grant #{permission_type}."
     end
 
     status_code(23)
diff --git a/lib/bundler/rubygems_gem_installer.rb b/lib/bundler/rubygems_gem_installer.rb
index fa46451887..39c9031c4a 100644
--- a/lib/bundler/rubygems_gem_installer.rb
+++ b/lib/bundler/rubygems_gem_installer.rb
@@ -19,7 +19,9 @@ module Bundler
       FileUtils.rm_rf gem_dir
       FileUtils.rm_rf spec.extension_dir
 
-      FileUtils.mkdir_p gem_dir, :mode => 0o755
+      SharedHelpers.filesystem_access(gem_dir, :create) do
+        FileUtils.mkdir_p gem_dir, :mode => 0o755
+      end
 
       extract_files