2 files changed, 41 insertions, 6 deletions
diff --git a/lib/gitlab_access.rb b/lib/gitlab_access.rb
index 3cdeb3e..e1a5e35 100644
--- a/lib/gitlab_access.rb
+++ b/lib/gitlab_access.rb
@@ -3,6 +3,7 @@ require_relative 'gitlab_net'
 require_relative 'gitlab_access_status'
 require_relative 'names_helper'
 require_relative 'gitlab_metrics'
+require_relative 'object_dirs_helper'
 require 'json'
 
 class GitlabAccess
@@ -23,12 +24,7 @@ class GitlabAccess
 
   def exec
     status = GitlabMetrics.measure('check-access:git-receive-pack') do
-      env = {
-        "GIT_ALTERNATE_OBJECT_DIRECTORIES" => ENV["GIT_ALTERNATE_OBJECT_DIRECTORIES"],
-        "GIT_OBJECT_DIRECTORY" => ENV["GIT_OBJECT_DIRECTORY"]
-      }
-
-      api.check_access('git-receive-pack', @gl_repository, @repo_path, @actor, @changes, @protocol, env: env.to_json)
+      api.check_access('git-receive-pack', @gl_repository, @repo_path, @actor, @changes, @protocol, env: ObjectDirsHelper.all_attributes.to_json)
     end
 
     raise AccessDeniedError, status.message unless status.allowed?
diff --git a/lib/object_dirs_helper.rb b/lib/object_dirs_helper.rb
new file mode 100644
index 0000000..e175a03
--- /dev/null
+++ b/lib/object_dirs_helper.rb
@@ -0,0 +1,39 @@
+require 'pathname'
+
+class ObjectDirsHelper
+  class << self
+    def all_attributes
+      {
+        "GIT_ALTERNATE_OBJECT_DIRECTORIES" => absolute_alt_object_dirs,
+        "GIT_ALTERNATE_OBJECT_DIRECTORIES_RELATIVE" => relative_alt_object_dirs,
+        "GIT_OBJECT_DIRECTORY" => absolute_object_dir,
+        "GIT_OBJECT_DIRECTORY_RELATIVE" => relative_object_dir
+      }
+    end
+
+    def absolute_object_dir
+      ENV['GIT_OBJECT_DIRECTORY']
+    end
+
+    def relative_object_dir
+      relative_path(absolute_object_dir)
+    end
+
+    def absolute_alt_object_dirs
+      ENV['GIT_ALTERNATE_OBJECT_DIRECTORIES'].to_s.split(File::PATH_SEPARATOR)
+    end
+
+    def relative_alt_object_dirs
+      absolute_alt_object_dirs.map { |dir| relative_path(dir) }.compact
+    end
+
+    private
+
+    def relative_path(absolute_path)
+      return if absolute_path.nil?
+
+      repo_dir = Dir.pwd
+      Pathname.new(absolute_path).relative_path_from(Pathname.new(repo_dir)).to_s
+    end
+  end
+end