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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 2014 Ivan Shapovalov | |
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 <errno.h> | |
24 | ||
25 | #include "log.h" | |
26 | #include "util.h" | |
27 | #include "special.h" | |
28 | #include "mkdir.h" | |
29 | #include "unit-name.h" | |
30 | ||
31 | static const char *arg_dest = "/tmp"; | |
32 | static char *arg_resume_dev = NULL; | |
33 | ||
34 | static int parse_proc_cmdline_item(const char *key, const char *value) { | |
35 | if (streq(key, "resume") && value) { | |
36 | free(arg_resume_dev); | |
37 | arg_resume_dev = fstab_node_to_udev_node(value); | |
38 | if (!arg_resume_dev) | |
39 | return log_oom(); | |
40 | } | |
41 | ||
42 | return 0; | |
43 | } | |
44 | ||
45 | static int process_resume(void) { | |
46 | _cleanup_free_ char *name = NULL, *lnk = NULL; | |
47 | ||
48 | if (!arg_resume_dev) | |
49 | return 0; | |
50 | ||
51 | name = unit_name_from_path_instance("systemd-hibernate-resume", arg_resume_dev, ".service"); | |
52 | if (!name) | |
53 | return log_oom(); | |
54 | ||
55 | lnk = strjoin(arg_dest, "/" SPECIAL_SYSINIT_TARGET ".wants/", name, NULL); | |
56 | if (!lnk) | |
57 | return log_oom(); | |
58 | ||
59 | mkdir_parents_label(lnk, 0755); | |
60 | if (symlink(SYSTEM_DATA_UNIT_PATH "/systemd-hibernate-resume@.service", lnk) < 0) | |
61 | return log_error_errno(errno, "Failed to create symlink %s: %m", lnk); | |
62 | ||
63 | return 0; | |
64 | } | |
65 | ||
66 | int main(int argc, char *argv[]) { | |
67 | int r = 0; | |
68 | ||
69 | if (argc > 1 && argc != 4) { | |
70 | log_error("This program takes three or no arguments."); | |
71 | return EXIT_FAILURE; | |
72 | } | |
73 | ||
74 | if (argc > 1) | |
75 | arg_dest = argv[1]; | |
76 | ||
77 | log_set_target(LOG_TARGET_SAFE); | |
78 | log_parse_environment(); | |
79 | log_open(); | |
80 | ||
81 | umask(0022); | |
82 | ||
83 | /* Don't even consider resuming outside of initramfs. */ | |
84 | if (!in_initrd()) | |
85 | return EXIT_SUCCESS; | |
86 | ||
87 | r = parse_proc_cmdline(parse_proc_cmdline_item); | |
88 | if (r < 0) | |
89 | log_warning_errno(r, "Failed to parse kernel command line, ignoring: %m"); | |
90 | ||
91 | r = process_resume(); | |
92 | free(arg_resume_dev); | |
93 | ||
94 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; | |
95 | } |