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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 | ||
b5efdb8a | 22 | #include "alloc-util.h" |
326bb68c | 23 | #include "mkdir.h" |
6bedfcbb | 24 | #include "parse-util.h" |
4e731273 LP |
25 | #include "proc-cmdline.h" |
26 | #include "string-util.h" | |
27 | #include "strv.h" | |
28 | #include "unit-name.h" | |
29 | #include "util.h" | |
326bb68c LP |
30 | |
31 | static const char *arg_dest = "/tmp"; | |
32 | static char **arg_mask = NULL; | |
3c5a87a8 | 33 | static char **arg_wants = NULL; |
326bb68c LP |
34 | static bool arg_debug_shell = false; |
35 | ||
36 | static int parse_proc_cmdline_item(const char *key, const char *value) { | |
37 | int r; | |
38 | ||
3c5a87a8 LP |
39 | assert(key); |
40 | ||
326bb68c LP |
41 | if (streq(key, "systemd.mask")) { |
42 | ||
43 | if (!value) | |
44 | log_error("Missing argument for systemd.mask= kernel command line parameter."); | |
45 | else { | |
46 | char *n; | |
47 | ||
7410616c LP |
48 | r = unit_name_mangle(value, UNIT_NAME_NOGLOB, &n); |
49 | if (r < 0) | |
50 | return log_error_errno(r, "Failed to glob unit name: %m"); | |
326bb68c LP |
51 | |
52 | r = strv_consume(&arg_mask, n); | |
53 | if (r < 0) | |
54 | return log_oom(); | |
55 | } | |
3c5a87a8 LP |
56 | |
57 | } else if (streq(key, "systemd.wants")) { | |
58 | ||
59 | if (!value) | |
60 | log_error("Missing argument for systemd.want= kernel command line parameter."); | |
61 | else { | |
62 | char *n; | |
63 | ||
7410616c LP |
64 | r = unit_name_mangle(value, UNIT_NAME_NOGLOB, &n); |
65 | if (r < 0) | |
66 | return log_error_errno(r, "Failed to glob unit name: %m"); | |
3c5a87a8 LP |
67 | |
68 | r = strv_consume(&arg_wants, n); | |
69 | if (r < 0) | |
70 | return log_oom(); | |
71 | } | |
72 | ||
326bb68c LP |
73 | } else if (streq(key, "systemd.debug-shell")) { |
74 | ||
75 | if (value) { | |
76 | r = parse_boolean(value); | |
77 | if (r < 0) | |
78 | log_error("Failed to parse systemd.debug-shell= argument '%s', ignoring.", value); | |
79 | else | |
80 | arg_debug_shell = r; | |
81 | } else | |
82 | arg_debug_shell = true; | |
83 | } | |
84 | ||
85 | return 0; | |
86 | } | |
87 | ||
88 | static int generate_mask_symlinks(void) { | |
89 | char **u; | |
90 | int r = 0; | |
91 | ||
92 | if (strv_isempty(arg_mask)) | |
93 | return 0; | |
94 | ||
95 | STRV_FOREACH(u, arg_mask) { | |
3c5a87a8 | 96 | _cleanup_free_ char *p = NULL; |
326bb68c | 97 | |
3c5a87a8 | 98 | p = strjoin(arg_dest, "/", *u, NULL); |
326bb68c LP |
99 | if (!p) |
100 | return log_oom(); | |
101 | ||
1f6b4113 | 102 | if (symlink("/dev/null", p) < 0) |
94c156cd LP |
103 | r = log_error_errno(errno, |
104 | "Failed to create mask symlink %s: %m", | |
105 | p); | |
326bb68c LP |
106 | } |
107 | ||
108 | return r; | |
109 | } | |
110 | ||
3c5a87a8 LP |
111 | static int generate_wants_symlinks(void) { |
112 | char **u; | |
113 | int r = 0; | |
326bb68c | 114 | |
3c5a87a8 | 115 | if (strv_isempty(arg_wants)) |
326bb68c LP |
116 | return 0; |
117 | ||
3c5a87a8 LP |
118 | STRV_FOREACH(u, arg_wants) { |
119 | _cleanup_free_ char *p = NULL, *f = NULL; | |
120 | ||
121 | p = strjoin(arg_dest, "/default.target.wants/", *u, NULL); | |
122 | if (!p) | |
123 | return log_oom(); | |
124 | ||
125 | f = strappend(SYSTEM_DATA_UNIT_PATH "/", *u); | |
126 | if (!f) | |
127 | return log_oom(); | |
326bb68c | 128 | |
3c5a87a8 | 129 | mkdir_parents_label(p, 0755); |
326bb68c | 130 | |
1f6b4113 | 131 | if (symlink(f, p) < 0) |
94c156cd LP |
132 | r = log_error_errno(errno, |
133 | "Failed to create wants symlink %s: %m", | |
134 | p); | |
326bb68c LP |
135 | } |
136 | ||
3c5a87a8 | 137 | return r; |
326bb68c LP |
138 | } |
139 | ||
140 | int main(int argc, char *argv[]) { | |
141 | int r, q; | |
142 | ||
143 | if (argc > 1 && argc != 4) { | |
144 | log_error("This program takes three or no arguments."); | |
145 | return EXIT_FAILURE; | |
146 | } | |
147 | ||
148 | if (argc > 1) | |
149 | arg_dest = argv[2]; | |
150 | ||
151 | log_set_target(LOG_TARGET_SAFE); | |
152 | log_parse_environment(); | |
153 | log_open(); | |
154 | ||
155 | umask(0022); | |
156 | ||
b5884878 LP |
157 | r = parse_proc_cmdline(parse_proc_cmdline_item); |
158 | if (r < 0) | |
da927ba9 | 159 | log_warning_errno(r, "Failed to parse kernel command line, ignoring: %m"); |
326bb68c | 160 | |
3c5a87a8 LP |
161 | if (arg_debug_shell) { |
162 | r = strv_extend(&arg_wants, "debug-shell.service"); | |
163 | if (r < 0) { | |
164 | r = log_oom(); | |
165 | goto finish; | |
166 | } | |
167 | } | |
168 | ||
326bb68c LP |
169 | r = generate_mask_symlinks(); |
170 | ||
3c5a87a8 | 171 | q = generate_wants_symlinks(); |
326bb68c LP |
172 | if (q < 0) |
173 | r = q; | |
174 | ||
3c5a87a8 | 175 | finish: |
326bb68c LP |
176 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; |
177 | ||
178 | } |