[libvirt] [PATCH] lxc: Fix return value handlings of vethInterfaceUpOrDown and moveInterfaceToNetNs

[Ryota Ozaki]

Both may return a positive value when they fail. We should check
if the value is not zero instead of checking if it's negative.

lxcContainerRenameAndEnableInterfaces is expected to return a negative
value on a failure, so the patch changes the return value to -1
if vethInterfaceUpOrDown fails.

Note that this patch may be related to the bug:
https://bugzilla.redhat.com/show_bug.cgi?id=607496 .
It would not fix the bug, but would unveil what happens.
---
 src/lxc/lxc_container.c  |    7 ++++++-
 src/lxc/lxc_controller.c |    2 +-
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/src/lxc/lxc_container.c b/src/lxc/lxc_container.c
index 4371dba..c77d262 100644
--- a/src/lxc/lxc_container.c
+++ b/src/lxc/lxc_container.c
@@ -273,8 +273,13 @@ static int lxcContainerRenameAndEnableInterfaces(unsigned int nveths,
     }
 
     /* enable lo device only if there were other net devices */
-    if (veths)
+    if (veths) {
         rc = vethInterfaceUpOrDown("lo", 1);
+        if (0 != rc) {
+            VIR_ERROR(_("Failed to enable lo (%d)"), rc);
+            rc = -1;
+        }
+    }
 
 error_out:
     VIR_FREE(newname);
diff --git a/src/lxc/lxc_controller.c b/src/lxc/lxc_controller.c
index d8b7bc7..9829a69 100644
--- a/src/lxc/lxc_controller.c
+++ b/src/lxc/lxc_controller.c
@@ -477,7 +477,7 @@ static int lxcControllerMoveInterfaces(unsigned int nveths,
 {
     unsigned int i;
     for (i = 0 ; i < nveths ; i++)
-        if (moveInterfaceToNetNs(veths[i], container) < 0) {
+        if (moveInterfaceToNetNs(veths[i], container) != 0) {
             lxcError(VIR_ERR_INTERNAL_ERROR,
                      _("Failed to move interface %s to ns %d"),
                      veths[i], container);
-- 
1.6.6.1