src/quotacheck/quotacheck.c

   1 /***
   2   This file is part of systemd.
   3
   4   Copyright 2010 Lennart Poettering
   5
   6   systemd is free software; you can redistribute it and/or modify it
   7   under the terms of the GNU Lesser General Public License as published by
   8   the Free Software Foundation; either version 2.1 of the License, or
   9   (at your option) any later version.
  10
  11   systemd is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   Lesser General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  18 ***/
  19
  20 #include <errno.h>
  21 #include <stdbool.h>
  22 #include <stdio.h>
  23 #include <sys/prctl.h>
  24 #include <unistd.h>
  25
  26 #include "proc-cmdline.h"
  27 #include "process-util.h"
  28 #include "signal-util.h"
  29 #include "string-util.h"
  30 #include "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, void *data) {
  36
  37         if (streq(key, "quotacheck.mode")) {
  38
  39                 if (proc_cmdline_value_missing(key, value))
  40                         return 0;
  41
  42                 if (streq(value, "auto"))
  43                         arg_force = arg_skip = false;
  44                 else if (streq(value, "force"))
  45                         arg_force = true;
  46                 else if (streq(value, "skip"))
  47                         arg_skip = true;
  48                 else
  49                         log_warning("Invalid quotacheck.mode= parameter '%s'. Ignoring.", value);
  50         }
  51
  52 #if HAVE_SYSV_COMPAT
  53         else if (streq(key, "forcequotacheck") && !value) {
  54                 log_warning("Please use 'quotacheck.mode=force' rather than 'forcequotacheck' on the kernel command line.");
  55                 arg_force = true;
  56         }
  57 #endif
  58
  59         return 0;
  60 }
  61
  62 static void test_files(void) {
  63
  64 #if HAVE_SYSV_COMPAT
  65         if (access("/forcequotacheck", F_OK) >= 0) {
  66                 log_error("Please pass 'quotacheck.mode=force' on the kernel command line rather than creating /forcequotacheck on the root file system.");
  67                 arg_force = true;
  68         }
  69 #endif
  70 }
  71
  72 int main(int argc, char *argv[]) {
  73
  74         static const char * const cmdline[] = {
  75                 QUOTACHECK,
  76                 "-anug",
  77                 NULL
  78         };
  79
  80         pid_t pid;
  81         int r;
  82
  83         if (argc > 1) {
  84                 log_error("This program takes no arguments.");
  85                 return EXIT_FAILURE;
  86         }
  87
  88         log_set_target(LOG_TARGET_AUTO);
  89         log_parse_environment();
  90         log_open();
  91
  92         umask(0022);
  93
  94         r = proc_cmdline_parse(parse_proc_cmdline_item, NULL, 0);
  95         if (r < 0)
  96                 log_warning_errno(r, "Failed to parse kernel command line, ignoring: %m");
  97
  98         test_files();
  99
 100         if (!arg_force) {
 101                 if (arg_skip)
 102                         return EXIT_SUCCESS;
 103
 104                 if (access("/run/systemd/quotacheck", F_OK) < 0)
 105                         return EXIT_SUCCESS;
 106         }
 107
 108         pid = fork();
 109         if (pid < 0) {
 110                 r = log_error_errno(errno, "fork(): %m");
 111                 goto finish;
 112         }
 113         if (pid == 0) {
 114
 115                 /* Child */
 116
 117                 (void) reset_all_signal_handlers();
 118                 (void) reset_signal_mask();
 119                 assert_se(prctl(PR_SET_PDEATHSIG, SIGTERM) == 0);
 120
 121                 execv(cmdline[0], (char**) cmdline);
 122                 _exit(1); /* Operational error */
 123         }
 124
 125         r = wait_for_terminate_and_warn("quotacheck", pid, true);
 126
 127 finish:
 128         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
 129 }