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From 9e9c6cbbdd60f4538cee041ffe3f9cd831c5de17 Mon Sep 17 00:00:00 2001
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From: Lennart Poettering <lennart@poettering.net>
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Date: Fri, 3 Aug 2018 20:21:27 +0200
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Subject: [PATCH] logind: improve logging in manager_connect_console()
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let's make sure we log about every failure
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Also, complain about systems where /dev/tty0 exists but
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/sys/class/tty/tty0/active does not. Such systems (usually container
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environments) are pretty broken as they mount something that is not a VC
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to /dev/tty0 and they really shouldn't.
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Systems should either have a VC or not, but not badly fake one by
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mounting things wildly.
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This just adds a warning message, as before we'll simply turn off VC
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handling in this case.
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(cherry picked from commit 0b6d55cae9b8adc507fbea95d1b2874729a77386)
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Related: #1642460
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---
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src/login/logind.c | 22 +++++++++++-----------
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1 file changed, 11 insertions(+), 11 deletions(-)
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diff --git a/src/login/logind.c b/src/login/logind.c
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index 52fcee933c..1b366cd55f 100644
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--- a/src/login/logind.c
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+++ b/src/login/logind.c
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@@ -815,28 +815,28 @@ static int manager_connect_console(Manager *m) {
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assert(m);
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assert(m->console_active_fd < 0);
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- /* On certain architectures (S390 and Xen, and containers),
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- /dev/tty0 does not exist, so don't fail if we can't open
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- it. */
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+ /* On certain systems (such as S390, Xen, and containers) /dev/tty0 does not exist (as there is no VC), so
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+ * don't fail if we can't open it. */
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+
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if (access("/dev/tty0", F_OK) < 0)
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return 0;
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m->console_active_fd = open("/sys/class/tty/tty0/active", O_RDONLY|O_NOCTTY|O_CLOEXEC);
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if (m->console_active_fd < 0) {
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- /* On some systems the device node /dev/tty0 may exist
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- * even though /sys/class/tty/tty0 does not. */
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- if (errno == ENOENT)
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+ /* On some systems /dev/tty0 may exist even though /sys/class/tty/tty0 does not. These are broken, but
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+ * common. Let's complain but continue anyway. */
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+ if (errno == ENOENT) {
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+ log_warning_errno(errno, "System has /dev/tty0 but not /sys/class/tty/tty0/active which is broken, ignoring: %m");
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return 0;
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+ }
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return log_error_errno(errno, "Failed to open /sys/class/tty/tty0/active: %m");
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}
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r = sd_event_add_io(m->event, &m->console_active_event_source, m->console_active_fd, 0, manager_dispatch_console, m);
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- if (r < 0) {
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- log_error("Failed to watch foreground console");
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- return r;
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- }
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+ if (r < 0)
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+ return log_error_errno(r, "Failed to watch foreground console: %m");
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/*
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* SIGRTMIN is used as global VT-release signal, SIGRTMIN + 1 is used
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@@ -855,7 +855,7 @@ static int manager_connect_console(Manager *m) {
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r = sd_event_add_signal(m->event, NULL, SIGRTMIN, manager_vt_switch, m);
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if (r < 0)
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- return r;
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+ return log_error_errno(r, "Failed to subscribe to signal: %m");
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return 0;
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}
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