src/quotacheck/quotacheck.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 /***
   3   This file is part of systemd.
   4
   5   Copyright 2010 Lennart Poettering
   6
   7   systemd is free software; you can redistribute it and/or modify it
   8   under the terms of the GNU Lesser General Public License as published by
   9   the Free Software Foundation; either version 2.1 of the License, or
  10   (at your option) any later version.
  11
  12   systemd is distributed in the hope that it will be useful, but
  13   WITHOUT ANY WARRANTY; without even the implied warranty of
  14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  15   Lesser General Public License for more details.
  16
  17   You should have received a copy of the GNU Lesser General Public License
  18   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  19 ***/
  20
  21 #include <errno.h>
  22 #include <stdbool.h>
  23 #include <stdio.h>
  24 #include <sys/prctl.h>
  25 #include <unistd.h>
  26
  27 #include "proc-cmdline.h"
  28 #include "process-util.h"
  29 #include "signal-util.h"
  30 #include "string-util.h"
  31 #include "util.h"
  32
  33 static bool arg_skip = false;
  34 static bool arg_force = false;
  35
  36 static int parse_proc_cmdline_item(const char *key, const char *value, void *data) {
  37
  38         if (streq(key, "quotacheck.mode")) {
  39
  40                 if (proc_cmdline_value_missing(key, value))
  41                         return 0;
  42
  43                 if (streq(value, "auto"))
  44                         arg_force = arg_skip = false;
  45                 else if (streq(value, "force"))
  46                         arg_force = true;
  47                 else if (streq(value, "skip"))
  48                         arg_skip = true;
  49                 else
  50                         log_warning("Invalid quotacheck.mode= parameter '%s'. Ignoring.", value);
  51         }
  52
  53 #if HAVE_SYSV_COMPAT
  54         else if (streq(key, "forcequotacheck") && !value) {
  55                 log_warning("Please use 'quotacheck.mode=force' rather than 'forcequotacheck' on the kernel command line.");
  56                 arg_force = true;
  57         }
  58 #endif
  59
  60         return 0;
  61 }
  62
  63 static void test_files(void) {
  64
  65 #if HAVE_SYSV_COMPAT
  66         if (access("/forcequotacheck", F_OK) >= 0) {
  67                 log_error("Please pass 'quotacheck.mode=force' on the kernel command line rather than creating /forcequotacheck on the root file system.");
  68                 arg_force = true;
  69         }
  70 #endif
  71 }
  72
  73 int main(int argc, char *argv[]) {
  74         int r;
  75
  76         if (argc > 1) {
  77                 log_error("This program takes no arguments.");
  78                 return EXIT_FAILURE;
  79         }
  80
  81         log_set_target(LOG_TARGET_AUTO);
  82         log_parse_environment();
  83         log_open();
  84
  85         umask(0022);
  86
  87         r = proc_cmdline_parse(parse_proc_cmdline_item, NULL, 0);
  88         if (r < 0)
  89                 log_warning_errno(r, "Failed to parse kernel command line, ignoring: %m");
  90
  91         test_files();
  92
  93         if (!arg_force) {
  94                 if (arg_skip)
  95                         return EXIT_SUCCESS;
  96
  97                 if (access("/run/systemd/quotacheck", F_OK) < 0)
  98                         return EXIT_SUCCESS;
  99         }
 100
 101         r = safe_fork("(quotacheck)", FORK_RESET_SIGNALS|FORK_DEATHSIG|FORK_LOG|FORK_WAIT, NULL);
 102         if (r < 0)
 103                 goto finish;
 104         if (r == 0) {
 105                 static const char * const cmdline[] = {
 106                         QUOTACHECK,
 107                         "-anug",
 108                         NULL
 109                 };
 110
 111                 /* Child */
 112
 113                 execv(cmdline[0], (char**) cmdline);
 114                 _exit(EXIT_FAILURE); /* Operational error */
 115         }
 116
 117 finish:
 118         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
 119 }