Immediatly raise exception if git-annex is disabled

lib/gitlab_shell.rb

@@ -50,11 +50,15 @@ class GitlabShell
     args = Shellwords.shellwords(@origin_cmd)
     @git_cmd = args.first
 
-    if @git_cmd == 'git-annex-shell' && @config.git_annex_enabled?
+    if @git_cmd == 'git-annex-shell'
+      if @config.git_annex_enabled?
         @repo_name = escape_path(args[2].sub(/\A\/~\//, ''))
 
         # Make sure repository has git-annex enabled
         init_git_annex(@repo_name)
+      else
+        raise DisallowedCommandError
+      end
     else
       raise DisallowedCommandError unless args.count == 2
       @repo_name = escape_path(args.last)
@@ -68,7 +72,8 @@ class GitlabShell
   def process_cmd
     repo_full_path = File.join(repos_path, repo_name)
 
-    if @git_cmd == 'git-annex-shell' && @config.git_annex_enabled?
+    if @git_cmd == 'git-annex-shell'
+      if @config.git_annex_enabled?
         args = Shellwords.shellwords(@origin_cmd)
         parsed_args =
           args.map do |arg|
@@ -83,6 +88,9 @@ class GitlabShell
 
         $logger.info "gitlab-shell: executing git-annex command <#{parsed_args.join(' ')}> for #{log_username}."
         exec_cmd(*parsed_args)
+      else
+        raise DisallowedCommandError
+      end
     else
       $logger.info "gitlab-shell: executing git command <#{@git_cmd} #{repo_full_path}> for #{log_username}."
       exec_cmd(@git_cmd, repo_full_path)