src/shared/volatile-util.c

   1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
   2
   3 #include <errno.h>
   4
   5 #include "alloc-util.h"
   6 #include "macro.h"
   7 #include "parse-util.h"
   8 #include "proc-cmdline.h"
   9 #include "string-table.h"
  10 #include "string-util.h"
  11 #include "volatile-util.h"
  12
  13 int query_volatile_mode(VolatileMode *ret) {
  14         _cleanup_free_ char *mode = NULL;
  15         int r;
  16
  17         r = proc_cmdline_get_key("systemd.volatile", PROC_CMDLINE_VALUE_OPTIONAL, &mode);
  18         if (r < 0)
  19                 return r;
  20         if (r == 0) {
  21                 *ret = VOLATILE_NO;
  22                 return 0;
  23         }
  24
  25         if (mode) {
  26                 VolatileMode m;
  27
  28                 m = volatile_mode_from_string(mode);
  29                 if (m < 0)
  30                         return m;
  31
  32                 *ret = m;
  33         } else
  34                 *ret = VOLATILE_YES;
  35
  36         return 1;
  37 }
  38
  39 static const char* const volatile_mode_table[_VOLATILE_MODE_MAX] = {
  40         [VOLATILE_NO] = "no",
  41         [VOLATILE_YES] = "yes",
  42         [VOLATILE_STATE] = "state",
  43         [VOLATILE_OVERLAY] = "overlay",
  44 };
  45
  46 DEFINE_STRING_TABLE_LOOKUP_WITH_BOOLEAN(volatile_mode, VolatileMode, VOLATILE_YES);