[libvirt] [PATCH 2/3] Implementation deficiency in virInitctlSetRunLevel v2

[Reco]

Implement fork & setns for lxcDomainShutdownFlags

---
 src/lxc/lxc_driver.c |   45 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)

diff --git a/src/lxc/lxc_driver.c b/src/lxc/lxc_driver.c
index c499182..9d200b2 100644
--- a/src/lxc/lxc_driver.c
+++ b/src/lxc/lxc_driver.c
@@ -2619,6 +2619,50 @@ lxcDomainShutdownFlags(virDomainPtr dom,
         goto cleanup;
     }
 
+#ifdef HAVE_SETNS
+    if (flags == 0 || flags & VIR_DOMAIN_SHUTDOWN_INITCTL) {
+        int pid = -1;
+        int status = -1;
+        int mfd = -1;
+
+        if (virAsprintf(&vroot, "/proc/%llu/ns/mnt",
+                        (unsigned long long)priv->initpid) < 0) {
+            goto cleanup;
+        }
+
+        if ((mfd = open(vroot, O_RDONLY)) < 0) {
+            virReportSystemError(VIR_ERR_OPERATION_UNSUPPORTED, "%s",
+                                 _("Kernel does not provide mount namespace"));
+         goto cleanup;
+        }
+
+        switch (pid = fork()) {
+        case 0:
+            if (setns(mfd, 0) == -1) {
+                exit(-1);
+            }
+            rc = virInitctlSetRunLevel(VIR_INITCTL_RUNLEVEL_POWEROFF, NULL);
+            exit(rc);
+            break;
+        case -1:
+            virReportSystemError(VIR_ERR_INTERNAL_ERROR, "%s",
+                                 _("Fork failed"));
+            goto cleanup;
+        default:
+            if (waitpid(pid, &status, 0) < 0 || status < 0) {
+                virReportSystemError(errno,
+                                     _("Sending shutdown failed with status %i"),
+                                     status);
+                rc = 0;
+            } else {
+                rc = status;
+            }
+            close(mfd);
+        }
+    } else {
+        rc = 0;
+    }
+#else
     if (virAsprintf(&vroot, "/proc/%llu/root",
                     (unsigned long long)priv->initpid) < 0)
         goto cleanup;
@@ -2638,6 +2682,7 @@ lxcDomainShutdownFlags(virDomainPtr dom,
     } else {
         rc = 0;
     }
+#endif
 
     if (rc == 0 &&
         (flags == 0 ||
-- 
1.7.10.4