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/*-*- 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 General Public License as published by
the Free Software Foundation; either version 2 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.
You should have received a copy of the GNU General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include "log.h"
#include "util.h"
#include "unit-name.h"
#include "virt.h"
static const char *arg_dest = "/tmp";
static int add_symlink(const char *fservice, const char *tservice) {
char *from = NULL, *to = NULL;
int r;
assert(fservice);
assert(tservice);
asprintf(&from, SYSTEM_DATA_UNIT_PATH "/%s", fservice);
asprintf(&to, "%s/getty.target.wants/%s", arg_dest, tservice);
if (!from || !to) {
log_error("Out of memory");
r = -ENOMEM;
goto finish;
}
mkdir_parents(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 */
r = 0;
else {
log_error("Failed to create symlink from %s to %s: %m", from, to);
r = -errno;
}
}
finish:
free(from);
free(to);
return r;
}
static int add_serial_getty(const char *tty) {
char *n;
int r;
assert(tty);
log_debug("Automatically adding serial getty for /dev/%s.", tty);
n = unit_name_replace_instance("serial-getty@.service", tty);
if (!n) {
log_error("Out of memory");
return -ENOMEM;
}
r = add_symlink("serial-getty@.service", n);
free(n);
return r;
}
int main(int argc, char *argv[]) {
static const char virtualization_consoles[] =
"hvc0\0"
"xvc0\0"
"hvsi0\0";
int r = EXIT_SUCCESS;
char *active;
const char *j;
if (argc > 2) {
log_error("This program takes one or no arguments.");
return EXIT_FAILURE;
}
log_set_target(LOG_TARGET_AUTO);
log_parse_environment();
log_open();
umask(0022);
if (argc > 1)
arg_dest = argv[1];
if (detect_container(NULL) > 0) {
log_debug("Automatically adding console shell.");
if (add_symlink("console-shell.service", "console-shell.service") < 0)
r = EXIT_FAILURE;
/* Don't add any further magic if we are in a container */
goto finish;
}
if (read_one_line_file("/sys/class/tty/console/active", &active) >= 0) {
const char *tty;
tty = strrchr(active, ' ');
if (tty)
tty ++;
else
tty = active;
/* Automatically add in a serial getty on the kernel
* console */
if (tty_is_vc(tty))
free(active);
else {
int k;
/* We assume that gettys on virtual terminals are
* started via manual configuration and do this magic
* only for non-VC terminals. */
k = add_serial_getty(tty);
free(active);
if (k < 0) {
r = EXIT_FAILURE;
goto finish;
}
}
}
/* Automatically add in a serial getty on the first
* virtualizer console */
NULSTR_FOREACH(j, virtualization_consoles) {
char *p;
int k;
if (asprintf(&p, "/sys/class/tty/%s", j) < 0) {
log_error("Out of memory");
r = EXIT_FAILURE;
goto finish;
}
k = access(p, F_OK);
free(p);
if (k < 0)
continue;
k = add_serial_getty(j);
if (k < 0) {
r = EXIT_FAILURE;
goto finish;
}
}
finish:
return r;
}
|
