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 <stdio.h>
  23 #include <stdbool.h>
  24 #include <errno.h>
  25 #include <unistd.h>
  26 #include <sys/prctl.h>
  27
  28 #include "util.h"
  29 #include "process-util.h"
  30 #include "signal-util.h"
  31
  32 static bool arg_skip = false;
  33 static bool arg_force = false;
  34
  35 static int parse_proc_cmdline_item(const char *key, const char *value) {
  36
  37         if (streq(key, "quotacheck.mode") && value) {
  38
  39                 if (streq(value, "auto"))
  40                         arg_force = arg_skip = false;
  41                 else if (streq(value, "force"))
  42                         arg_force = true;
  43                 else if (streq(value, "skip"))
  44                         arg_skip = true;
  45                 else
  46                         log_warning("Invalid quotacheck.mode= parameter '%s'. Ignoring.", value);
  47         }
  48
  49 #ifdef HAVE_SYSV_COMPAT
  50         else if (streq(key, "forcequotacheck") && !value) {
  51                 log_warning("Please use 'quotacheck.mode=force' rather than 'forcequotacheck' on the kernel command line.");
  52                 arg_force = true;
  53         }
  54 #endif
  55
  56         return 0;
  57 }
  58
  59 static void test_files(void) {
  60
  61 #ifdef HAVE_SYSV_COMPAT
  62         if (access("/forcequotacheck", F_OK) >= 0) {
  63                 log_error("Please pass 'quotacheck.mode=force' on the kernel command line rather than creating /forcequotacheck on the root file system.");
  64                 arg_force = true;
  65         }
  66 #endif
  67 }
  68
  69 int main(int argc, char *argv[]) {
  70
  71         static const char * const cmdline[] = {
  72                 QUOTACHECK,
  73                 "-anug",
  74                 NULL
  75         };
  76
  77         pid_t pid;
  78         int r;
  79
  80         if (argc > 1) {
  81                 log_error("This program takes no arguments.");
  82                 return EXIT_FAILURE;
  83         }
  84
  85         log_set_target(LOG_TARGET_AUTO);
  86         log_parse_environment();
  87         log_open();
  88
  89         umask(0022);
  90
  91         r = parse_proc_cmdline(parse_proc_cmdline_item);
  92         if (r < 0)
  93                 log_warning_errno(r, "Failed to parse kernel command line, ignoring: %m");
  94
  95         test_files();
  96
  97         if (!arg_force) {
  98                 if (arg_skip)
  99                         return EXIT_SUCCESS;
 100
 101                 if (access("/run/systemd/quotacheck", F_OK) < 0)
 102                         return EXIT_SUCCESS;
 103         }
 104
 105         pid = fork();
 106         if (pid < 0) {
 107                 log_error_errno(errno, "fork(): %m");
 108                 return EXIT_FAILURE;
 109         } else if (pid == 0) {
 110
 111                 /* Child */
 112
 113                 (void) reset_all_signal_handlers();
 114                 (void) reset_signal_mask();
 115                 assert_se(prctl(PR_SET_PDEATHSIG, SIGTERM) == 0);
 116
 117                 execv(cmdline[0], (char**) cmdline);
 118                 _exit(1); /* Operational error */
 119         }
 120
 121         r = wait_for_terminate_and_warn("quotacheck", pid, true);
 122
 123         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
 124 }