login: assing /dev/console logins to seat0

[elogind.git] / src / shared / util.c

diff --git a/src/shared/util.c b/src/shared/util.c
index 7f41fc4f5ece08f14e66aa463510029947ffd24b..def576de2130981cbc51ea64b74e2397f996949d 100644 (file)
--- a/src/shared/util.c
+++ b/src/shared/util.c
@@ -6,16 +6,16 @@
   Copyright 2010 Lennart Poettering
 
   systemd is free software; you can redistribute it and/or modify it
-  under the terms of the GNU General Public License as published by
-  the Free Software Foundation; either version 2 of the License, or
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
   (at your option) any later version.
 
   systemd is distributed in the hope that it will be useful, but
   WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-  General Public License for more details.
+  Lesser General Public License for more details.
 
-  You should have received a copy of the GNU General Public License
+  You should have received a copy of the GNU Lesser General Public License
   along with systemd; If not, see <http://www.gnu.org/licenses/>.
 ***/
 
@@ -56,6 +56,7 @@
 #include <glob.h>
 #include <grp.h>
 #include <sys/mman.h>
+#include <sys/statvfs.h>
 
 #include "macro.h"
 #include "util.h"
@@ -1690,7 +1691,8 @@ char *cescape(const char *s) {
 
         /* Does C style string escaping. */
 
-        if (!(r = new(char, strlen(s)*4 + 1)))
+        r = new(char, strlen(s)*4 + 1);
+        if (!r)
                 return NULL;
 
         for (f = s, t = r; *f; f++)
@@ -4285,6 +4287,15 @@ bool tty_is_vc(const char *tty) {
         return vtnr_from_tty(tty) >= 0;
 }
 
+bool tty_is_console(const char *tty) {
+        assert(tty);
+
+        if (startswith(tty, "/dev/"))
+                tty += 5;
+
+        return streq(tty, "console");
+}
+
 int vtnr_from_tty(const char *tty) {
         int i, r;
 
@@ -4318,8 +4329,10 @@ bool tty_is_vc_resolve(const char *tty) {
         if (startswith(tty, "/dev/"))
                 tty += 5;
 
-        /* Resolve where /dev/console is pointing to */
-        if (streq(tty, "console"))
+        /* Resolve where /dev/console is pointing to, if /sys is
+         * actually ours (i.e. not read-only-mounted which is a sign
+         * for container setups) */
+        if (streq(tty, "console") && path_is_read_only_fs("/sys") <= 0)
                 if (read_one_line_file("/sys/class/tty/console/active", &active) >= 0) {
                         /* If multiple log outputs are configured the
                          * last one is what /dev/console points to */
@@ -6036,7 +6049,7 @@ int fd_inc_rcvbuf(int fd, size_t n) {
         return 1;
 }
 
-int fork_agent(pid_t *pid, const char *path, ...) {
+int fork_agent(pid_t *pid, const int except[], unsigned n_except, const char *path, ...) {
         pid_t parent_pid, agent_pid;
         int fd;
         bool stdout_is_tty, stderr_is_tty;
@@ -6073,7 +6086,7 @@ int fork_agent(pid_t *pid, const char *path, ...) {
                 _exit(EXIT_SUCCESS);
 
         /* Don't leak fds to the agent */
-        close_all_fds(NULL, 0);
+        close_all_fds(except, n_except);
 
         stdout_is_tty = isatty(STDOUT_FILENO);
         stderr_is_tty = isatty(STDERR_FILENO);
@@ -6120,3 +6133,38 @@ int fork_agent(pid_t *pid, const char *path, ...) {
         execv(path, l);
         _exit(EXIT_FAILURE);
 }
+
+int setrlimit_closest(int resource, const struct rlimit *rlim) {
+        struct rlimit highest, fixed;
+
+        assert(rlim);
+
+        if (setrlimit(resource, rlim) >= 0)
+                return 0;
+
+        if (errno != EPERM)
+                return -errno;
+
+        /* So we failed to set the desired setrlimit, then let's try
+         * to get as close as we can */
+        assert_se(getrlimit(resource, &highest) == 0);
+
+        fixed.rlim_cur = MIN(rlim->rlim_cur, highest.rlim_max);
+        fixed.rlim_max = MIN(rlim->rlim_max, highest.rlim_max);
+
+        if (setrlimit(resource, &fixed) < 0)
+                return -errno;
+
+        return 0;
+}
+
+int path_is_read_only_fs(const char *path) {
+        struct statvfs st;
+
+        assert(path);
+
+        if (statvfs(path, &st) < 0)
+                return -errno;
+
+        return !!(st.f_flag & ST_RDONLY);
+}