From 99f9b697165f1f081499b45b7789508dcf0c2553 Mon Sep 17 00:00:00 2001
From: "Guillaume J. Charmes" <guillaume.charmes@dotcloud.com>
Date: Sat, 30 Mar 2013 10:33:10 -0700
Subject: [PATCH] Add debug infos in CmdInfo to know the amount of fds and
 goroutines in use

---
 commands.go |  6 ++++++
 utils.go    | 10 ++++++++++
 2 files changed, 16 insertions(+)

diff --git a/commands.go b/commands.go
index b48aa4af9b..891d3d10c6 100644
--- a/commands.go
+++ b/commands.go
@@ -203,6 +203,12 @@ func (srv *Server) CmdInfo(stdin io.ReadCloser, stdout io.Writer, args ...string
 		len(srv.runtime.List()),
 		VERSION,
 		imgcount)
+
+	if !rcli.DEBUG_FLAG {
+		return nil
+	}
+	fmt.Fprintf(stdout, "debug mode enabled\n")
+	fmt.Fprintf(stdout, "fds: %d\ngoroutines: %d\n", getTotalUsedFds(), runtime.NumGoroutine())
 	return nil
 }
 
diff --git a/utils.go b/utils.go
index fbbad34081..3c6c3c91ee 100644
--- a/utils.go
+++ b/utils.go
@@ -7,6 +7,7 @@ import (
 	"fmt"
 	"github.com/dotcloud/docker/rcli"
 	"io"
+	"io/ioutil"
 	"net/http"
 	"os"
 	"os/exec"
@@ -260,3 +261,12 @@ func (w *writeBroadcaster) Close() error {
 func newWriteBroadcaster() *writeBroadcaster {
 	return &writeBroadcaster{list.New()}
 }
+
+func getTotalUsedFds() int {
+	if fds, err := ioutil.ReadDir(fmt.Sprintf("/proc/%d/fd", os.Getpid())); err != nil {
+		Debugf("Error opening /proc/%d/fd: %s", os.Getpid(), err)
+	} else {
+		return len(fds)
+	}
+	return -1
+}