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
  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) {
  37
  38         if (streq(key, "quotacheck.mode") && value) {
  39
  40                 if (streq(value, "auto"))
  41                         arg_force = arg_skip = false;
  42                 else if (streq(value, "force"))
  43                         arg_force = true;
  44                 else if (streq(value, "skip"))
  45                         arg_skip = true;
  46                 else
  47                         log_warning("Invalid quotacheck.mode= parameter '%s'. Ignoring.", value);
  48         }
  49
  50 #ifdef HAVE_SYSV_COMPAT
  51         else if (streq(key, "forcequotacheck") && !value) {
  52                 log_warning("Please use 'quotacheck.mode=force' rather than 'forcequotacheck' on the kernel command line.");
  53                 arg_force = true;
  54         }
  55 #endif
  56
  57         return 0;
  58 }
  59
  60 static void test_files(void) {
  61
  62 #ifdef HAVE_SYSV_COMPAT
  63         if (access("/forcequotacheck", F_OK) >= 0) {
  64                 log_error("Please pass 'quotacheck.mode=force' on the kernel command line rather than creating /forcequotacheck on the root file system.");
  65                 arg_force = true;
  66         }
  67 #endif
  68 }
  69
  70 int main(int argc, char *argv[]) {
  71
  72         static const char * const cmdline[] = {
  73                 QUOTACHECK,
  74                 "-anug",
  75                 NULL
  76         };
  77
  78         pid_t pid;
  79         int r;
  80
  81         if (argc > 1) {
  82                 log_error("This program takes no arguments.");
  83                 return EXIT_FAILURE;
  84         }
  85
  86         log_set_target(LOG_TARGET_AUTO);
  87         log_parse_environment();
  88         log_open();
  89
  90         umask(0022);
  91
  92         r = parse_proc_cmdline(parse_proc_cmdline_item);
  93         if (r < 0)
  94                 log_warning_errno(r, "Failed to parse kernel command line, ignoring: %m");
  95
  96         test_files();
  97
  98         if (!arg_force) {
  99                 if (arg_skip)
 100                         return EXIT_SUCCESS;
 101
 102                 if (access("/run/systemd/quotacheck", F_OK) < 0)
 103                         return EXIT_SUCCESS;
 104         }
 105
 106         pid = fork();
 107         if (pid < 0) {
 108                 log_error_errno(errno, "fork(): %m");
 109                 return EXIT_FAILURE;
 110         } else if (pid == 0) {
 111
 112                 /* Child */
 113
 114                 (void) reset_all_signal_handlers();
 115                 (void) reset_signal_mask();
 116                 assert_se(prctl(PR_SET_PDEATHSIG, SIGTERM) == 0);
 117
 118                 execv(cmdline[0], (char**) cmdline);
 119                 _exit(1); /* Operational error */
 120         }
 121
 122         r = wait_for_terminate_and_warn("quotacheck", pid, true);
 123
 124         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
 125 }