From f88548c0af03f894a8c30d03a1fd2af350389594 Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Fri, 13 Apr 2012 16:53:49 +0200
Subject: [PATCH] manager: support systems lacking /dev/tty0 (cherry picked
 from commit a41b539efce4765c3e7a81ed308610776cc73173)

---
 src/core/manager.c |   14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/src/core/manager.c b/src/core/manager.c
index 533d4cd..d6cec40 100644
--- a/src/core/manager.c
+++ b/src/core/manager.c
@@ -141,13 +141,17 @@ static int enable_special_signals(Manager *m) {
 
         assert(m);
 
-        /* Enable that we get SIGINT on control-alt-del */
-        if (reboot(RB_DISABLE_CAD) < 0)
+        /* Enable that we get SIGINT on control-alt-del. In containers
+         * this will fail with EPERM, so ignore that. */
+        if (reboot(RB_DISABLE_CAD) < 0 && errno != EPERM)
                 log_warning("Failed to enable ctrl-alt-del handling: %m");
 
-        if ((fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC)) < 0)
-                log_warning("Failed to open /dev/tty0: %m");
-        else {
+        fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC);
+        if (fd < 0) {
+                /* Support systems without virtual console */
+                if (fd != -ENOENT)
+                        log_warning("Failed to open /dev/tty0: %m");
+        } else {
                 /* Enable that we get SIGWINCH on kbrequest */
                 if (ioctl(fd, KDSIGACCEPT, SIGWINCH) < 0)
                         log_warning("Failed to enable kbrequest handling: %s", strerror(errno));