From e31c61c5ffecd28042d95979fb32f49bf96ad2fb Mon Sep 17 00:00:00 2001
From: Sapan Bhatia <gwsapan@gmail.com>
Date: Fri, 28 Jun 2013 12:53:27 -0400
Subject: [PATCH] lxcsu proc bug fix

---
 lxcsu-internal |  5 +++++
 setns.c        | 11 +++++++++++
 2 files changed, 16 insertions(+)

diff --git a/lxcsu-internal b/lxcsu-internal
index 894b08e..a670d62 100755
--- a/lxcsu-internal
+++ b/lxcsu-internal
@@ -152,9 +152,13 @@ def main ():
     if (not args.pidns):
         setns.chcontext('/proc/%s/ns/pid'%pid)
 
+    proc_mounted = False
     if (not os.access('/proc/self',0)):
+        proc_mounted = True
         setns.proc_mount()
 
+    
+
     # cgroups is not yet LXC-safe, so we need to use the course grained access control
     # strategy of unmounting the filesystem
 
@@ -185,6 +189,7 @@ def main ():
         if debug: print 'lxcsu-internal:execv:','/usr/bin/setarch',exec_args
         os.execv('/usr/bin/setarch',exec_args)
     else:
+        setns.proc_umount()
         _,status = os.waitpid(pid,0)
         exit(os.WEXITSTATUS(status))
 
diff --git a/setns.c b/setns.c
index c40d52b..7d82d53 100644
--- a/setns.c
+++ b/setns.c
@@ -38,6 +38,16 @@ proc_mount(PyObject *self, PyObject *args)
     return Py_BuildValue("i", sts);
 }
 
+static PyObject *
+proc_umount(PyObject *self, PyObject *args)
+{
+    int sts; 
+    sts = umount("/proc");
+
+    return Py_BuildValue("i", sts);
+
+}
+
 static PyObject *
 chcontext(PyObject *self, PyObject *args)
 {
@@ -66,6 +76,7 @@ out:
 static PyMethodDef SetnsMethods[] =
 {
          {"proc_mount", proc_mount, METH_VARARGS, "Mount a volume via the mount system call."},
+         {"proc_umount", proc_umount, METH_VARARGS, "Umount a volume via the umount system call."},
          {"chcontext", chcontext, METH_VARARGS, "Switch into an lxc container."},
          {"chfscontext", chfscontext, METH_VARARGS, "Switch into an lxc container."},
               {NULL, NULL, 0, NULL}
-- 
2.43.0