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 
query_volatile_mode(VolatileMode * ret)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);
47