/*-*- 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 "log.h" #include "util.h" #include "mkdir.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); from = strappend(SYSTEM_DATA_UNIT_PATH "/", fservice); to = strjoin(arg_dest,"/getty.target.wants/", tservice, NULL); if (!from || !to) { log_error("Out of memory."); r = -ENOMEM; goto finish; } 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 */ 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 > 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) { log_debug("Automatically adding console shell."); if (add_symlink("console-getty.service", "console-getty.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; }