src/quotacheck/quotacheck.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 Lesser General Public License as published by
  10   the Free Software Foundation; either version 2.1 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   Lesser General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <errno.h>
  23 #include <stdbool.h>
  24 #include <stdio.h>
  25 #include <sys/prctl.h>
  26 #include <unistd.h>
  27
  28 #include "process-util.h"
  29 #include "signal-util.h"
  30 #include "string-util.h"
  31 #include "util.h"
  32 #include "proc-cmdline.h"
  33
  34 static bool arg_skip = false;
  35 static bool arg_force = false;
  36
  37 static int parse_proc_cmdline_item(const char *key, const char *value) {
  38
  39         if (streq(key, "quotacheck.mode") && value) {
  40
  41                 if (streq(value, "auto"))
  42                         arg_force = arg_skip = false;
  43                 else if (streq(value, "force"))
  44                         arg_force = true;
  45                 else if (streq(value, "skip"))
  46                         arg_skip = true;
  47                 else
  48                         log_warning("Invalid quotacheck.mode= parameter '%s'. Ignoring.", value);
  49         }
  50
  51 #ifdef HAVE_SYSV_COMPAT
  52         else if (streq(key, "forcequotacheck") && !value) {
  53                 log_warning("Please use 'quotacheck.mode=force' rather than 'forcequotacheck' on the kernel command line.");
  54                 arg_force = true;
  55         }
  56 #endif
  57
  58         return 0;
  59 }
  60
  61 static void test_files(void) {
  62
  63 #ifdef HAVE_SYSV_COMPAT
  64         if (access("/forcequotacheck", F_OK) >= 0) {
  65                 log_error("Please pass 'quotacheck.mode=force' on the kernel command line rather than creating /forcequotacheck on the root file system.");
  66                 arg_force = true;
  67         }
  68 #endif
  69 }
  70
  71 int main(int argc, char *argv[]) {
  72
  73         static const char * const cmdline[] = {
  74                 QUOTACHECK,
  75                 "-anug",
  76                 NULL
  77         };
  78
  79         pid_t pid;
  80         int r;
  81
  82         if (argc > 1) {
  83                 log_error("This program takes no arguments.");
  84                 return EXIT_FAILURE;
  85         }
  86
  87         log_set_target(LOG_TARGET_AUTO);
  88         log_parse_environment();
  89         log_open();
  90
  91         umask(0022);
  92
  93         r = parse_proc_cmdline(parse_proc_cmdline_item);
  94         if (r < 0)
  95                 log_warning_errno(r, "Failed to parse kernel command line, ignoring: %m");
  96
  97         test_files();
  98
  99         if (!arg_force) {
 100                 if (arg_skip)
 101                         return EXIT_SUCCESS;
 102
 103                 if (access("/run/systemd/quotacheck", F_OK) < 0)
 104                         return EXIT_SUCCESS;
 105         }
 106
 107         pid = fork();
 108         if (pid < 0) {
 109                 log_error_errno(errno, "fork(): %m");
 110                 return EXIT_FAILURE;
 111         } else if (pid == 0) {
 112
 113                 /* Child */
 114
 115                 (void) reset_all_signal_handlers();
 116                 (void) reset_signal_mask();
 117                 assert_se(prctl(PR_SET_PDEATHSIG, SIGTERM) == 0);
 118
 119                 execv(cmdline[0], (char**) cmdline);
 120                 _exit(1); /* Operational error */
 121         }
 122
 123         r = wait_for_terminate_and_warn("quotacheck", pid, true);
 124
 125         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
 126 }