[libvirt] [PATCH v2 2/8] LXC: enable user namespace when user set the uidmap

[Gao feng]

If the idmap exist, the user namespace will be enabled
automatically.
If you want disable user namespace,just remove these
elements from XML.

Signed-off-by: Gao feng <gaofeng at cn.fujitsu.com>
---
 src/lxc/lxc_container.c | 14 ++++----------
 1 file changed, 4 insertions(+), 10 deletions(-)

diff --git a/src/lxc/lxc_container.c b/src/lxc/lxc_container.c
index 8e1d10a..094f205 100644
--- a/src/lxc/lxc_container.c
+++ b/src/lxc/lxc_container.c
@@ -2030,16 +2030,10 @@ cleanup:
     return ret;
 }
 
-static int userns_supported(void)
+static int userns_supported(virDomainDefPtr def)
 {
-#if 1
-    /*
-     * put off using userns until uid mapping is implemented
-     */
-    return 0;
-#else
-    return lxcContainerAvailable(LXC_CONTAINER_FEATURE_USER) == 0;
-#endif
+    return (def->idmap.nuidmap && def->idmap.ngidmap &&
+            lxcContainerAvailable(LXC_CONTAINER_FEATURE_USER) == 0);
 }
 
 virArch lxcContainerGetAlt32bitArch(virArch arch)
@@ -2119,7 +2113,7 @@ int lxcContainerStart(virDomainDefPtr def,
 
     cflags = CLONE_NEWPID|CLONE_NEWNS|CLONE_NEWUTS|CLONE_NEWIPC|SIGCHLD;
 
-    if (userns_supported()) {
+    if (userns_supported(def)) {
         VIR_DEBUG("Enable user namespaces");
         cflags |= CLONE_NEWUSER;
     }
-- 
1.8.1.4