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