[libvirt] [PATCH] Fix start of containers with custom root filesystem

[Daniel P. Berrange]

From: "Daniel P. Berrange" <berrange at redhat.com>

A prefix change to unmount the SELinux filesystem broke starting
of LXC containers with a custom root filesystem

Signed-off-by: Daniel P. Berrange <berrange at redhat.com>
---
 src/lxc/lxc_container.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/lxc/lxc_container.c b/src/lxc/lxc_container.c
index a749d24..4bb2aff 100644
--- a/src/lxc/lxc_container.c
+++ b/src/lxc/lxc_container.c
@@ -1191,6 +1191,8 @@ static int lxcContainerGetSubtree(const char *prefix,
     char **mounts = NULL;
     size_t nmounts = 0;
 
+    VIR_DEBUG("prefix=%s", prefix);
+
     *mountsret = NULL;
     *nmountsret = 0;
 
@@ -1528,7 +1530,8 @@ static int lxcContainerSetupPivotRoot(virDomainDefPtr vmDef,
     /* Some versions of Linux kernel don't let you overmount
      * the selinux filesystem, so make sure we kill it first
      */
-    if (lxcContainerUnmountSubtree(SELINUX_MOUNT, false) < 0)
+    if (STREQ(root->src, "/") &&
+        lxcContainerUnmountSubtree(SELINUX_MOUNT, false) < 0)
         goto cleanup;
 #endif
 
-- 
1.7.11.2