Remove support for old kernels lacking private devpts

Early on kernel support for private devpts was not widespread,
so we had compatibiltiy codepaths. Such old kernels are not
seriously used for LXC these days, so the compat code can go
away
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

src/lxc/lxc_controller.c

@@ -1252,8 +1252,9 @@ virLXCControllerSetupDevPTS(virLXCControllerPtr ctrl)
     }
 
     if (access(ctrl->devptmx, R_OK) < 0) {
-        VIR_WARN("Kernel does not support private devpts, using shared devpts");
-        VIR_FREE(ctrl->devptmx);
+        virReportSystemError(ENOSYS, "%s",
+                             _("Kernel does not support private devpts"));
+        goto cleanup;
     }
 
     ret = 0;
@@ -1278,24 +1279,13 @@ virLXCControllerSetupConsoles(virLXCControllerPtr ctrl,
     size_t i;
 
     for (i = 0 ; i < ctrl->nconsoles ; i++) {
-        if (ctrl->devptmx) {
-            VIR_DEBUG("Opening tty on private %s", ctrl->devptmx);
-            if (lxcCreateTty(ctrl->devptmx,
-                             &ctrl->consoles[i].contFd,
-                             &containerTTYPaths[i]) < 0) {
-                virReportSystemError(errno, "%s",
-                                     _("Failed to allocate tty"));
-                return -1;
-            }
-        } else {
-            VIR_DEBUG("Opening tty on shared /dev/ptmx");
-            if (virFileOpenTty(&ctrl->consoles[i].contFd,
-                               &containerTTYPaths[i],
-                               0) < 0) {
-                virReportSystemError(errno, "%s",
+        VIR_DEBUG("Opening tty on private %s", ctrl->devptmx);
+        if (lxcCreateTty(ctrl->devptmx,
+                         &ctrl->consoles[i].contFd,
+                         &containerTTYPaths[i]) < 0) {
+            virReportSystemError(errno, "%s",
                                      _("Failed to allocate tty"));
-                return -1;
-            }
+            return -1;
         }
     }
     return 0;