diff --git a/lib/gitlab_projects.rb b/lib/gitlab_projects.rb
index 0b11ce3..ffc3faf 100644
--- a/lib/gitlab_projects.rb
+++ b/lib/gitlab_projects.rb
@@ -8,7 +8,7 @@ require_relative 'gitlab_metrics'
 require_relative 'gitlab_metrics'
 
 class GitlabProjects
-  GLOBAL_HOOKS_DIRECTORY = File.join(ROOT_PATH, 'hooks')
+  GLOBAL_HOOKS_DIRECTORY = ENV['GITLAB_SHELL_HOOKS_PATH'] || File.join(ROOT_PATH, 'hooks')
 
   # Project name is a directory name for repository with .git at the end
   # It may be namespaced or not. Like repo.git or gitlab/repo.git
diff --git a/lib/gitlab_shell.rb b/lib/gitlab_shell.rb
index e7d0254..181ec8a 100644
--- a/lib/gitlab_shell.rb
+++ b/lib/gitlab_shell.rb
@@ -188,7 +188,8 @@ class GitlabShell
     end
 
     # We use 'chdir: ROOT_PATH' to let the next executable know where config.yml is.
-    Kernel::exec(env, *args, unsetenv_others: true, chdir: ROOT_PATH)
+    # Except we don't, because we're already in the right directory on nixos !
+    Kernel::exec(env, *args, unsetenv_others: true)
   end
 
   def api
diff --git a/go/internal/config/config.go b/go/internal/config/config.go
index c57b4de..88cfc95 100644
--- a/go/internal/config/config.go
+++ b/go/internal/config/config.go
@@ -27,7 +27,7 @@ func New() (*Config, error) {
 	}
 	cfg.RootDir = dir
 
-	configBytes, err := ioutil.ReadFile(path.Join(cfg.RootDir, configFile))
+	configBytes, err := ioutil.ReadFile(os.Getenv("GITLAB_SHELL_CONFIG_PATH"))
 	if err != nil {
 		return nil, err
 	}