+++ /dev/null
-/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
-
-/***
- This file is part of systemd.
-
- Copyright 2010 Lennart Poettering
-
- systemd is free software; you can redistribute it and/or modify it
- 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
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public License
- along with systemd; If not, see <http://www.gnu.org/licenses/>.
-***/
-
-#include <string.h>
-#include <errno.h>
-#include <unistd.h>
-#include <fcntl.h>
-
-#include "log.h"
-#include "util.h"
-#include "mkdir.h"
-#include "unit-name.h"
-#include "virt.h"
-#include "fileio.h"
-#include "path-util.h"
-
-static const char *arg_dest = "/tmp";
-
-static int add_symlink(const char *fservice, const char *tservice) {
- char *from, *to;
- int r;
-
- assert(fservice);
- assert(tservice);
-
- from = strjoina(SYSTEM_DATA_UNIT_PATH "/", fservice);
- to = strjoina(arg_dest, "/getty.target.wants/", tservice);
-
- mkdir_parents_label(to, 0755);
-
- r = symlink(from, to);
- if (r < 0) {
- if (errno == EEXIST)
- /* In case console=hvc0 is passed this will very likely result in EEXIST */
- return 0;
- else {
- log_error_errno(errno, "Failed to create symlink %s: %m", to);
- return -errno;
- }
- }
-
- return 0;
-}
-
-static int add_serial_getty(const char *tty) {
- _cleanup_free_ char *n = NULL;
-
- assert(tty);
-
- log_debug("Automatically adding serial getty for /dev/%s.", tty);
-
- n = unit_name_from_path_instance("serial-getty", tty, ".service");
- if (!n)
- return log_oom();
-
- return add_symlink("serial-getty@.service", n);
-}
-
-static int add_container_getty(const char *tty) {
- _cleanup_free_ char *n = NULL;
-
- assert(tty);
-
- log_debug("Automatically adding container getty for /dev/pts/%s.", tty);
-
- n = unit_name_from_path_instance("container-getty", tty, ".service");
- if (!n)
- return log_oom();
-
- return add_symlink("container-getty@.service", n);
-}
-
-static int verify_tty(const char *name) {
- _cleanup_close_ int fd = -1;
- const char *p;
-
- /* Some TTYs are weird and have been enumerated but don't work
- * when you try to use them, such as classic ttyS0 and
- * friends. Let's check that and open the device and run
- * isatty() on it. */
-
- p = strjoina("/dev/", name);
-
- /* O_NONBLOCK is essential here, to make sure we don't wait
- * for DCD */
- fd = open(p, O_RDWR|O_NONBLOCK|O_NOCTTY|O_CLOEXEC|O_NOFOLLOW);
- if (fd < 0)
- return -errno;
-
- errno = 0;
- if (isatty(fd) <= 0)
- return errno ? -errno : -EIO;
-
- return 0;
-}
-
-int main(int argc, char *argv[]) {
-
- static const char virtualization_consoles[] =
- "hvc0\0"
- "xvc0\0"
- "hvsi0\0"
- "sclp_line0\0"
- "ttysclp0\0"
- "3270!tty1\0";
-
- _cleanup_free_ char *active = NULL;
- const char *j;
- int r;
-
- if (argc > 1 && argc != 4) {
- log_error("This program takes three or no arguments.");
- return EXIT_FAILURE;
- }
-
- if (argc > 1)
- arg_dest = argv[1];
-
- log_set_target(LOG_TARGET_SAFE);
- log_parse_environment();
- log_open();
-
- umask(0022);
-
- if (detect_container(NULL) > 0) {
- _cleanup_free_ char *container_ttys = NULL;
-
- log_debug("Automatically adding console shell.");
-
- if (add_symlink("console-getty.service", "console-getty.service") < 0)
- return EXIT_FAILURE;
-
- /* When $container_ttys is set for PID 1, spawn
- * gettys on all ptys named therein. Note that despite
- * the variable name we only support ptys here. */
-
- r = getenv_for_pid(1, "container_ttys", &container_ttys);
- if (r > 0) {
- const char *word, *state;
- size_t l;
-
- FOREACH_WORD(word, l, container_ttys, state) {
- const char *t;
- char tty[l + 1];
-
- memcpy(tty, word, l);
- tty[l] = 0;
-
- /* First strip off /dev/ if it is specified */
- t = path_startswith(tty, "/dev/");
- if (!t)
- t = tty;
-
- /* Then, make sure it's actually a pty */
- t = path_startswith(t, "pts/");
- if (!t)
- continue;
-
- if (add_container_getty(t) < 0)
- return EXIT_FAILURE;
- }
- }
-
- /* Don't add any further magic if we are in a container */
- return EXIT_SUCCESS;
- }
-
- if (read_one_line_file("/sys/class/tty/console/active", &active) >= 0) {
- const char *word, *state;
- size_t l;
-
- /* Automatically add in a serial getty on all active
- * kernel consoles */
- FOREACH_WORD(word, l, active, state) {
- _cleanup_free_ char *tty = NULL;
-
- tty = strndup(word, l);
- if (!tty) {
- log_oom();
- return EXIT_FAILURE;
- }
-
- if (isempty(tty) || tty_is_vc(tty))
- continue;
-
- if (verify_tty(tty) < 0)
- continue;
-
- /* We assume that gettys on virtual terminals are
- * started via manual configuration and do this magic
- * only for non-VC terminals. */
-
- if (add_serial_getty(tty) < 0)
- return EXIT_FAILURE;
- }
- }
-
- /* Automatically add in a serial getty on the first
- * virtualizer console */
- NULSTR_FOREACH(j, virtualization_consoles) {
- char *p;
-
- p = strjoina("/sys/class/tty/", j);
- if (access(p, F_OK) < 0)
- continue;
-
- if (add_serial_getty(j) < 0)
- return EXIT_FAILURE;
- }
-
- return EXIT_SUCCESS;
-}
~ianmdlvl / elogind.git / blobdiff