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326bb68c LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2014 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 "util.h" | |
23 | #include "strv.h" | |
24 | #include "unit-name.h" | |
25 | #include "mkdir.h" | |
07630cea | 26 | #include "string-util.h" |
326bb68c LP |
27 | |
28 | static const char *arg_dest = "/tmp"; | |
29 | static char **arg_mask = NULL; | |
3c5a87a8 | 30 | static char **arg_wants = NULL; |
326bb68c LP |
31 | static bool arg_debug_shell = false; |
32 | ||
33 | static int parse_proc_cmdline_item(const char *key, const char *value) { | |
34 | int r; | |
35 | ||
3c5a87a8 LP |
36 | assert(key); |
37 | ||
326bb68c LP |
38 | if (streq(key, "systemd.mask")) { |
39 | ||
40 | if (!value) | |
41 | log_error("Missing argument for systemd.mask= kernel command line parameter."); | |
42 | else { | |
43 | char *n; | |
44 | ||
7410616c LP |
45 | r = unit_name_mangle(value, UNIT_NAME_NOGLOB, &n); |
46 | if (r < 0) | |
47 | return log_error_errno(r, "Failed to glob unit name: %m"); | |
326bb68c LP |
48 | |
49 | r = strv_consume(&arg_mask, n); | |
50 | if (r < 0) | |
51 | return log_oom(); | |
52 | } | |
3c5a87a8 LP |
53 | |
54 | } else if (streq(key, "systemd.wants")) { | |
55 | ||
56 | if (!value) | |
57 | log_error("Missing argument for systemd.want= kernel command line parameter."); | |
58 | else { | |
59 | char *n; | |
60 | ||
7410616c LP |
61 | r = unit_name_mangle(value, UNIT_NAME_NOGLOB, &n); |
62 | if (r < 0) | |
63 | return log_error_errno(r, "Failed to glob unit name: %m"); | |
3c5a87a8 LP |
64 | |
65 | r = strv_consume(&arg_wants, n); | |
66 | if (r < 0) | |
67 | return log_oom(); | |
68 | } | |
69 | ||
326bb68c LP |
70 | } else if (streq(key, "systemd.debug-shell")) { |
71 | ||
72 | if (value) { | |
73 | r = parse_boolean(value); | |
74 | if (r < 0) | |
75 | log_error("Failed to parse systemd.debug-shell= argument '%s', ignoring.", value); | |
76 | else | |
77 | arg_debug_shell = r; | |
78 | } else | |
79 | arg_debug_shell = true; | |
80 | } | |
81 | ||
82 | return 0; | |
83 | } | |
84 | ||
85 | static int generate_mask_symlinks(void) { | |
86 | char **u; | |
87 | int r = 0; | |
88 | ||
89 | if (strv_isempty(arg_mask)) | |
90 | return 0; | |
91 | ||
92 | STRV_FOREACH(u, arg_mask) { | |
3c5a87a8 | 93 | _cleanup_free_ char *p = NULL; |
326bb68c | 94 | |
3c5a87a8 | 95 | p = strjoin(arg_dest, "/", *u, NULL); |
326bb68c LP |
96 | if (!p) |
97 | return log_oom(); | |
98 | ||
1f6b4113 | 99 | if (symlink("/dev/null", p) < 0) |
94c156cd LP |
100 | r = log_error_errno(errno, |
101 | "Failed to create mask symlink %s: %m", | |
102 | p); | |
326bb68c LP |
103 | } |
104 | ||
105 | return r; | |
106 | } | |
107 | ||
3c5a87a8 LP |
108 | static int generate_wants_symlinks(void) { |
109 | char **u; | |
110 | int r = 0; | |
326bb68c | 111 | |
3c5a87a8 | 112 | if (strv_isempty(arg_wants)) |
326bb68c LP |
113 | return 0; |
114 | ||
3c5a87a8 LP |
115 | STRV_FOREACH(u, arg_wants) { |
116 | _cleanup_free_ char *p = NULL, *f = NULL; | |
117 | ||
118 | p = strjoin(arg_dest, "/default.target.wants/", *u, NULL); | |
119 | if (!p) | |
120 | return log_oom(); | |
121 | ||
122 | f = strappend(SYSTEM_DATA_UNIT_PATH "/", *u); | |
123 | if (!f) | |
124 | return log_oom(); | |
326bb68c | 125 | |
3c5a87a8 | 126 | mkdir_parents_label(p, 0755); |
326bb68c | 127 | |
1f6b4113 | 128 | if (symlink(f, p) < 0) |
94c156cd LP |
129 | r = log_error_errno(errno, |
130 | "Failed to create wants symlink %s: %m", | |
131 | p); | |
326bb68c LP |
132 | } |
133 | ||
3c5a87a8 | 134 | return r; |
326bb68c LP |
135 | } |
136 | ||
137 | int main(int argc, char *argv[]) { | |
138 | int r, q; | |
139 | ||
140 | if (argc > 1 && argc != 4) { | |
141 | log_error("This program takes three or no arguments."); | |
142 | return EXIT_FAILURE; | |
143 | } | |
144 | ||
145 | if (argc > 1) | |
146 | arg_dest = argv[2]; | |
147 | ||
148 | log_set_target(LOG_TARGET_SAFE); | |
149 | log_parse_environment(); | |
150 | log_open(); | |
151 | ||
152 | umask(0022); | |
153 | ||
b5884878 LP |
154 | r = parse_proc_cmdline(parse_proc_cmdline_item); |
155 | if (r < 0) | |
da927ba9 | 156 | log_warning_errno(r, "Failed to parse kernel command line, ignoring: %m"); |
326bb68c | 157 | |
3c5a87a8 LP |
158 | if (arg_debug_shell) { |
159 | r = strv_extend(&arg_wants, "debug-shell.service"); | |
160 | if (r < 0) { | |
161 | r = log_oom(); | |
162 | goto finish; | |
163 | } | |
164 | } | |
165 | ||
326bb68c LP |
166 | r = generate_mask_symlinks(); |
167 | ||
3c5a87a8 | 168 | q = generate_wants_symlinks(); |
326bb68c LP |
169 | if (q < 0) |
170 | r = q; | |
171 | ||
3c5a87a8 | 172 | finish: |
326bb68c LP |
173 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; |
174 | ||
175 | } |