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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 "extract-word.h" | |
23 | #include "fileio.h" | |
24 | #include "macro.h" | |
25 | #include "parse-util.h" | |
26 | #include "proc-cmdline.h" | |
27 | #include "process-util.h" | |
28 | #include "string-util.h" | |
29 | #include "util.h" | |
30 | #include "virt.h" | |
31 | ||
32 | int proc_cmdline(char **ret) { | |
33 | assert(ret); | |
34 | ||
35 | if (detect_container() > 0) | |
36 | return get_process_cmdline(1, 0, false, ret); | |
37 | else | |
38 | return read_one_line_file("/proc/cmdline", ret); | |
39 | } | |
40 | ||
41 | int parse_proc_cmdline(int (*parse_item)(const char *key, const char *value)) { | |
42 | _cleanup_free_ char *line = NULL; | |
43 | const char *p; | |
44 | int r; | |
45 | ||
46 | assert(parse_item); | |
47 | ||
48 | r = proc_cmdline(&line); | |
49 | if (r < 0) | |
50 | return r; | |
51 | ||
52 | p = line; | |
53 | for (;;) { | |
54 | _cleanup_free_ char *word = NULL; | |
55 | char *value = NULL; | |
56 | ||
57 | r = extract_first_word(&p, &word, NULL, EXTRACT_QUOTES|EXTRACT_RELAX); | |
58 | if (r < 0) | |
59 | return r; | |
60 | if (r == 0) | |
61 | break; | |
62 | ||
63 | /* Filter out arguments that are intended only for the | |
64 | * initrd */ | |
65 | if (!in_initrd() && startswith(word, "rd.")) | |
66 | continue; | |
67 | ||
68 | value = strchr(word, '='); | |
69 | if (value) | |
70 | *(value++) = 0; | |
71 | ||
72 | r = parse_item(word, value); | |
73 | if (r < 0) | |
74 | return r; | |
75 | } | |
76 | ||
77 | return 0; | |
78 | } | |
79 | ||
80 | int get_proc_cmdline_key(const char *key, char **value) { | |
81 | _cleanup_free_ char *line = NULL, *ret = NULL; | |
82 | bool found = false; | |
83 | const char *p; | |
84 | int r; | |
85 | ||
86 | assert(key); | |
87 | ||
88 | r = proc_cmdline(&line); | |
89 | if (r < 0) | |
90 | return r; | |
91 | ||
92 | p = line; | |
93 | for (;;) { | |
94 | _cleanup_free_ char *word = NULL; | |
95 | const char *e; | |
96 | ||
97 | r = extract_first_word(&p, &word, NULL, EXTRACT_QUOTES|EXTRACT_RELAX); | |
98 | if (r < 0) | |
99 | return r; | |
100 | if (r == 0) | |
101 | break; | |
102 | ||
103 | /* Filter out arguments that are intended only for the | |
104 | * initrd */ | |
105 | if (!in_initrd() && startswith(word, "rd.")) | |
106 | continue; | |
107 | ||
108 | if (value) { | |
109 | e = startswith(word, key); | |
110 | if (!e) | |
111 | continue; | |
112 | ||
113 | r = free_and_strdup(&ret, e); | |
114 | if (r < 0) | |
115 | return r; | |
116 | ||
117 | found = true; | |
118 | } else { | |
119 | if (streq(word, key)) | |
120 | found = true; | |
121 | } | |
122 | } | |
123 | ||
124 | if (value) { | |
125 | *value = ret; | |
126 | ret = NULL; | |
127 | } | |
128 | ||
129 | return found; | |
130 | ||
131 | } | |
132 | ||
133 | int shall_restore_state(void) { | |
134 | _cleanup_free_ char *value = NULL; | |
135 | int r; | |
136 | ||
137 | r = get_proc_cmdline_key("systemd.restore_state=", &value); | |
138 | if (r < 0) | |
139 | return r; | |
140 | if (r == 0) | |
141 | return true; | |
142 | ||
143 | return parse_boolean(value) != 0; | |
144 | } |