src/rc-local-generator/rc-local-generator.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2010 Lennart Poettering
   7   Copyright 2011 Michal Schmidt
   8
   9   systemd is free software; you can redistribute it and/or modify it
  10   under the terms of the GNU Lesser General Public License as published by
  11   the Free Software Foundation; either version 2.1 of the License, or
  12   (at your option) any later version.
  13
  14   systemd is distributed in the hope that it will be useful, but
  15   WITHOUT ANY WARRANTY; without even the implied warranty of
  16   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  17   Lesser General Public License for more details.
  18
  19   You should have received a copy of the GNU Lesser General Public License
  20   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  21 ***/
  22
  23 #include <errno.h>
  24 #include <stdio.h>
  25 #include <unistd.h>
  26
  27 #include "log.h"
  28 #include "util.h"
  29 #include "mkdir.h"
  30
  31 #if defined(TARGET_FEDORA) || defined(TARGET_MANDRIVA) || defined(TARGET_MAGEIA)
  32 #define SCRIPT_PATH_START "/etc/rc.d/rc.local"
  33 #elif defined(TARGET_SUSE)
  34 #define SCRIPT_PATH_START "/etc/init.d/boot.local"
  35 #endif
  36
  37 #define SCRIPT_PATH_STOP "/sbin/halt.local"
  38
  39 const char *arg_dest = "/tmp";
  40
  41 static int add_symlink(const char *service, const char *where) {
  42         char *from = NULL, *to = NULL;
  43         int r;
  44
  45         assert(service);
  46
  47         asprintf(&from, SYSTEM_DATA_UNIT_PATH "/%s", service);
  48         asprintf(&to, "%s/%s.wants/%s", arg_dest, where, service);
  49
  50         if (!from || !to) {
  51                 log_error("Out of memory.");
  52                 r = -ENOMEM;
  53                 goto finish;
  54         }
  55
  56         mkdir_parents_label(to, 0755);
  57
  58         r = symlink(from, to);
  59         if (r < 0) {
  60                 if (errno == EEXIST)
  61                         r = 0;
  62                 else {
  63                         log_error("Failed to create symlink from %s to %s: %m", from, to);
  64                         r = -errno;
  65                 }
  66         }
  67
  68 finish:
  69         free(from);
  70         free(to);
  71
  72         return r;
  73 }
  74
  75 static bool file_is_executable(const char *f) {
  76         struct stat st;
  77
  78         if (stat(f, &st) < 0)
  79                 return false;
  80
  81         return S_ISREG(st.st_mode) && (st.st_mode & 0111);
  82 }
  83
  84 int main(int argc, char *argv[]) {
  85         int r = EXIT_SUCCESS;
  86
  87         if (argc > 1 && argc != 4) {
  88                 log_error("This program takes three or no arguments.");
  89                 return EXIT_FAILURE;
  90         }
  91
  92         if (argc > 1)
  93                 arg_dest = argv[1];
  94
  95         log_set_target(LOG_TARGET_SAFE);
  96         log_parse_environment();
  97         log_open();
  98
  99         umask(0022);
 100
 101         if (file_is_executable(SCRIPT_PATH_START)) {
 102                 log_debug("Automatically adding rc-local.service.");
 103
 104                 if (add_symlink("rc-local.service", "multi-user.target") < 0)
 105                         r = EXIT_FAILURE;
 106         }
 107
 108         if (file_is_executable(SCRIPT_PATH_STOP)) {
 109                 log_debug("Automatically adding halt-local.service.");
 110
 111                 if (add_symlink("halt-local.service", "final.target") < 0)
 112                         r = EXIT_FAILURE;
 113         }
 114
 115         return r;
 116 }