src/modules-load.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
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU General Public License as published by
  10   the Free Software Foundation; either version 2 of the License, or
  11   (at your option) any later version.
  12
  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   General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <unistd.h>
  23 #include <fcntl.h>
  24 #include <errno.h>
  25 #include <string.h>
  26 #include <sys/stat.h>
  27 #include <limits.h>
  28 #include <dirent.h>
  29
  30 #include "log.h"
  31 #include "util.h"
  32 #include "strv.h"
  33
  34 int main(int argc, char *argv[]) {
  35         int r = EXIT_FAILURE;
  36         char **arguments = NULL;
  37         unsigned n_arguments = 0, n_allocated = 0;
  38         char **files, **fn;
  39
  40         if (argc > 1) {
  41                 log_error("This program takes no argument.");
  42                 return EXIT_FAILURE;
  43         }
  44
  45         log_set_target(LOG_TARGET_SYSLOG_OR_KMSG);
  46         log_parse_environment();
  47         log_open();
  48
  49         if (!(arguments = strv_new("/sbin/modprobe", "-sab", "--", NULL))) {
  50                 log_error("Failed to allocate string array");
  51                 goto finish;
  52         }
  53
  54         n_arguments = n_allocated = 3;
  55
  56         if (conf_files_list(&files, ".conf",
  57                             "/run/modules-load.d",
  58                             "/etc/modules-load.d",
  59                             "/usr/lib/modules-load.d",
  60                             NULL) < 0) {
  61                 log_error("Failed to enumerate modules-load.d files: %s", strerror(-r));
  62                 goto finish;
  63         }
  64
  65         r = EXIT_SUCCESS;
  66
  67         STRV_FOREACH(fn, files) {
  68                 FILE *f;
  69
  70                 f = fopen(*fn, "re");
  71                 if (!f) {
  72                         if (errno == ENOENT)
  73                                 continue;
  74
  75                         log_error("Failed to open %s: %m", *fn);
  76                         free(fn);
  77                         r = EXIT_FAILURE;
  78                         continue;
  79                 }
  80
  81                 log_debug("apply: %s\n", *fn);
  82                 for (;;) {
  83                         char line[LINE_MAX], *l, *t;
  84
  85                         if (!(fgets(line, sizeof(line), f)))
  86                                 break;
  87
  88                         l = strstrip(line);
  89                         if (*l == '#' || *l == 0)
  90                                 continue;
  91
  92                         if (!(t = strdup(l))) {
  93                                 log_error("Failed to allocate module name.");
  94                                 continue;
  95                         }
  96
  97                         if (n_arguments >= n_allocated) {
  98                                 char **a;
  99                                 unsigned m;
 100
 101                                 m = MAX(16U, n_arguments*2);
 102
 103                                 if (!(a = realloc(arguments, sizeof(char*) * (m+1)))) {
 104                                         log_error("Failed to increase module array size.");
 105                                         free(t);
 106                                         r = EXIT_FAILURE;
 107                                         continue;
 108                                 }
 109
 110                                 arguments = a;
 111                                 n_allocated = m;
 112                         }
 113
 114                         arguments[n_arguments++] = t;
 115                 }
 116
 117                 if (ferror(f)) {
 118                         r = EXIT_FAILURE;
 119                         log_error("Failed to read from file: %m");
 120                 }
 121
 122                 fclose(f);
 123         }
 124
 125         strv_free(files);
 126 finish:
 127
 128         if (n_arguments > 3) {
 129                 arguments[n_arguments] = NULL;
 130                 execv("/sbin/modprobe", arguments);
 131
 132                 log_error("Failed to execute /sbin/modprobe: %m");
 133                 r = EXIT_FAILURE;
 134         }
 135
 136         strv_free(arguments);
 137
 138         return r;
 139 }