1 files changed, 63 insertions, 0 deletions
diff --git a/lib/gitlab/git/popen.rb b/lib/gitlab/git/popen.rb
index 3d2fc471d28..b45da6020ee 100644
--- a/lib/gitlab/git/popen.rb
+++ b/lib/gitlab/git/popen.rb
@@ -5,6 +5,8 @@ require 'open3'
 module Gitlab
   module Git
     module Popen
+      FAST_GIT_PROCESS_TIMEOUT = 15.seconds
+
       def popen(cmd, path, vars = {})
         unless cmd.is_a?(Array)
           raise "System commands must be given as an array of strings"
@@ -27,6 +29,67 @@ module Gitlab
 
         [@cmd_output, @cmd_status]
       end
+
+      def popen_with_timeout(cmd, timeout, path, vars = {})
+        unless cmd.is_a?(Array)
+          raise "System commands must be given as an array of strings"
+        end
+
+        path ||= Dir.pwd
+        vars['PWD'] = path
+
+        unless File.directory?(path)
+          FileUtils.mkdir_p(path)
+        end
+
+        rout, wout = IO.pipe
+        rerr, werr = IO.pipe
+
+        pid = Process.spawn(vars, *cmd, out: wout, err: werr, chdir: path, pgroup: true)
+
+        begin
+          status = process_wait_with_timeout(pid, timeout)
+
+          # close write ends so we could read them
+          wout.close
+          werr.close
+
+          cmd_output = rout.readlines.join
+          cmd_output << rerr.readlines.join # Copying the behaviour of `popen` which merges stderr into output
+
+          [cmd_output, status.exitstatus]
+        rescue Timeout::Error => e
+          kill_process_group_for_pid(pid)
+
+          raise e
+        ensure
+          wout.close unless wout.closed?
+          werr.close unless werr.closed?
+
+          rout.close
+          rerr.close
+        end
+      end
+
+      def process_wait_with_timeout(pid, timeout)
+        deadline = timeout.seconds.from_now
+        wait_time = 0.01
+
+        while deadline > Time.now
+          sleep(wait_time)
+          _, status = Process.wait2(pid, Process::WNOHANG)
+
+          return status unless status.nil?
+        end
+
+        raise Timeout::Error, "Timeout waiting for process ##{pid}"
+      end
+
+      def kill_process_group_for_pid(pid)
+        Process.kill("KILL", -pid)
+        Process.wait(pid)
+      rescue Errno::ESRCH
+      end
     end
   end
 end