1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2010 Lennart Poettering
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU Lesser General Public License as published by
10 the Free Software Foundation; either version 2.1 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 Lesser General Public License for more details.
18 You should have received a copy of the GNU Lesser General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
29 #include "unit-name.h"
32 #include "path-util.h"
34 static const char *arg_dest = "/tmp";
36 static int add_symlink(const char *fservice, const char *tservice) {
37 _cleanup_free_ char *from = NULL, *to = NULL;
43 from = strappend(SYSTEM_DATA_UNIT_PATH "/", fservice);
47 to = strjoin(arg_dest,"/getty.target.wants/", tservice, NULL);
51 mkdir_parents_label(to, 0755);
53 r = symlink(from, to);
56 /* In case console=hvc0 is passed this will very likely result in EEXIST */
59 log_error("Failed to create symlink %s: %m", to);
67 static int add_serial_getty(const char *tty) {
68 _cleanup_free_ char *n = NULL;
72 log_debug("Automatically adding serial getty for /dev/%s.", tty);
74 n = unit_name_replace_instance("serial-getty@.service", tty);
78 return add_symlink("serial-getty@.service", n);
81 static int add_container_getty(const char *tty) {
82 _cleanup_free_ char *n = NULL;
86 log_debug("Automatically adding container getty for /dev/pts/%s.", tty);
88 n = unit_name_replace_instance("container-getty@.service", tty);
92 return add_symlink("container-getty@.service", n);
95 int main(int argc, char *argv[]) {
97 static const char virtualization_consoles[] =
104 _cleanup_free_ char *active = NULL;
108 if (argc > 1 && argc != 4) {
109 log_error("This program takes three or no arguments.");
116 log_set_target(LOG_TARGET_SAFE);
117 log_parse_environment();
122 if (detect_container(NULL) > 0) {
123 _cleanup_free_ char *container_ttys = NULL;
125 log_debug("Automatically adding console shell.");
127 if (add_symlink("console-getty.service", "console-getty.service") < 0)
130 /* When $container_ttys is set for PID 1, spawn
131 * gettys on all ptys named therein. Note that despite
132 * the variable name we only support ptys here. */
134 r = getenv_for_pid(1, "container_ttys", &container_ttys);
139 FOREACH_WORD(w, l, container_ttys, state) {
146 /* First strip off /dev/ if it is specified */
147 t = path_startswith(tty, "/dev/");
151 /* Then, make sure it's actually a pty */
152 t = path_startswith(t, "pts/");
156 if (add_container_getty(t) < 0)
161 /* Don't add any further magic if we are in a container */
165 if (read_one_line_file("/sys/class/tty/console/active", &active) >= 0) {
169 /* Automatically add in a serial getty on all active
171 FOREACH_WORD(w, l, active, state) {
172 _cleanup_free_ char *tty = NULL;
180 if (isempty(tty) || tty_is_vc(tty))
183 /* We assume that gettys on virtual terminals are
184 * started via manual configuration and do this magic
185 * only for non-VC terminals. */
187 if (add_serial_getty(tty) < 0)
192 /* Automatically add in a serial getty on the first
193 * virtualizer console */
194 NULSTR_FOREACH(j, virtualization_consoles) {
195 _cleanup_free_ char *p = NULL;
197 p = strappend("/sys/class/tty/", j);
203 if (access(p, F_OK) < 0)
206 if (add_serial_getty(j) < 0)