lxc: Try harder to stop/reboot containers

If shutting down a container via setting the runlevel fails, the
control jumps right onto endjob label and doesn't even try
sending the signal. If flags allow it, we should try both
methods.
Signed-off-by: NMaxim Kozin <kolomaxes@gmail.com>
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>

src/lxc/lxc_driver.c

@@ -3269,7 +3269,7 @@ lxcDomainShutdownFlags(virDomainPtr dom,
     virLXCDomainObjPrivatePtr priv;
     virDomainObjPtr vm;
     int ret = -1;
-    int rc;
+    int rc = -1;
 
     virCheckFlags(VIR_DOMAIN_SHUTDOWN_INITCTL |
                   VIR_DOMAIN_SHUTDOWN_SIGNAL, -1);
@@ -3298,19 +3298,17 @@ lxcDomainShutdownFlags(virDomainPtr dom,
         (flags & VIR_DOMAIN_SHUTDOWN_INITCTL)) {
         int command = VIR_INITCTL_RUNLEVEL_POWEROFF;
 
-        if ((rc = virLXCDomainSetRunlevel(vm, command)) < 0)
-            goto endjob;
-        if (rc == 0 && flags != 0 &&
-            ((flags & ~VIR_DOMAIN_SHUTDOWN_INITCTL) == 0)) {
+        if ((rc = virLXCDomainSetRunlevel(vm, command)) < 0) {
+            if (flags != 0 &&
+                (flags & VIR_DOMAIN_SHUTDOWN_INITCTL)) {
                 virReportError(VIR_ERR_OPERATION_UNSUPPORTED, "%s",
                                _("Container does not provide an initctl pipe"));
                 goto endjob;
             }
-    } else {
-        rc = 0;
+        }
     }
 
-    if (rc == 0 &&
+    if (rc < 0 &&
         (flags == 0 ||
          (flags & VIR_DOMAIN_SHUTDOWN_SIGNAL))) {
         if (kill(priv->initpid, SIGTERM) < 0 &&
@@ -3347,7 +3345,7 @@ lxcDomainReboot(virDomainPtr dom,
     virLXCDomainObjPrivatePtr priv;
     virDomainObjPtr vm;
     int ret = -1;
-    int rc;
+    int rc = -1;
 
     virCheckFlags(VIR_DOMAIN_REBOOT_INITCTL |
                   VIR_DOMAIN_REBOOT_SIGNAL, -1);
@@ -3376,19 +3374,17 @@ lxcDomainReboot(virDomainPtr dom,
         (flags & VIR_DOMAIN_REBOOT_INITCTL)) {
         int command = VIR_INITCTL_RUNLEVEL_REBOOT;
 
-        if ((rc = virLXCDomainSetRunlevel(vm, command)) < 0)
-            goto endjob;
-        if (rc == 0 && flags != 0 &&
-            ((flags & ~VIR_DOMAIN_SHUTDOWN_INITCTL) == 0)) {
+        if ((rc = virLXCDomainSetRunlevel(vm, command)) < 0) {
+            if (flags != 0 &&
+                (flags & VIR_DOMAIN_REBOOT_INITCTL)) {
                 virReportError(VIR_ERR_OPERATION_UNSUPPORTED, "%s",
                                _("Container does not provide an initctl pipe"));
                 goto endjob;
             }
-    } else {
-        rc = 0;
+        }
     }
 
-    if (rc == 0 &&
+    if (rc < 0 &&
         (flags == 0 ||
          (flags & VIR_DOMAIN_REBOOT_SIGNAL))) {
         if (kill(priv->initpid, SIGHUP) < 0 &&