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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
326bb68c LP |
2 | /*** |
3 | This file is part of systemd. | |
4 | ||
5 | Copyright 2014 Lennart Poettering | |
6 | ||
7 | systemd is free software; you can redistribute it and/or modify it | |
8 | under the terms of the GNU Lesser General Public License as published by | |
9 | the Free Software Foundation; either version 2.1 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | systemd is distributed in the hope that it will be useful, but | |
13 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | Lesser General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU Lesser General Public License | |
18 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
19 | ***/ | |
20 | ||
b5efdb8a | 21 | #include "alloc-util.h" |
326bb68c | 22 | #include "mkdir.h" |
6bedfcbb | 23 | #include "parse-util.h" |
4e731273 | 24 | #include "proc-cmdline.h" |
7dcc5671 | 25 | #include "special.h" |
4e731273 LP |
26 | #include "string-util.h" |
27 | #include "strv.h" | |
28 | #include "unit-name.h" | |
29 | #include "util.h" | |
326bb68c | 30 | |
7dcc5671 | 31 | static char *arg_default_unit = NULL; |
326bb68c LP |
32 | static const char *arg_dest = "/tmp"; |
33 | static char **arg_mask = NULL; | |
3c5a87a8 | 34 | static char **arg_wants = NULL; |
326bb68c LP |
35 | static bool arg_debug_shell = false; |
36 | ||
96287a49 | 37 | static int parse_proc_cmdline_item(const char *key, const char *value, void *data) { |
326bb68c LP |
38 | int r; |
39 | ||
3c5a87a8 LP |
40 | assert(key); |
41 | ||
326bb68c | 42 | if (streq(key, "systemd.mask")) { |
1d84ad94 | 43 | char *n; |
326bb68c | 44 | |
1d84ad94 LP |
45 | if (proc_cmdline_value_missing(key, value)) |
46 | return 0; | |
326bb68c | 47 | |
1d84ad94 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 | 51 | |
1d84ad94 LP |
52 | r = strv_consume(&arg_mask, n); |
53 | if (r < 0) | |
54 | return log_oom(); | |
3c5a87a8 LP |
55 | |
56 | } else if (streq(key, "systemd.wants")) { | |
1d84ad94 | 57 | char *n; |
3c5a87a8 | 58 | |
1d84ad94 LP |
59 | if (proc_cmdline_value_missing(key, value)) |
60 | return 0; | |
3c5a87a8 | 61 | |
1d84ad94 LP |
62 | r = unit_name_mangle(value, UNIT_NAME_NOGLOB, &n); |
63 | if (r < 0) | |
64 | return log_error_errno(r, "Failed to glob unit name: %m"); | |
3c5a87a8 | 65 | |
1d84ad94 LP |
66 | r = strv_consume(&arg_wants, n); |
67 | if (r < 0) | |
68 | return log_oom(); | |
3c5a87a8 | 69 | |
1d84ad94 | 70 | } else if (proc_cmdline_key_streq(key, "systemd.debug_shell")) { |
326bb68c LP |
71 | |
72 | if (value) { | |
73 | r = parse_boolean(value); | |
74 | if (r < 0) | |
1d84ad94 | 75 | log_error("Failed to parse systemd.debug_shell= argument '%s', ignoring.", value); |
326bb68c LP |
76 | else |
77 | arg_debug_shell = r; | |
78 | } else | |
79 | arg_debug_shell = true; | |
1d84ad94 | 80 | |
7dcc5671 EV |
81 | } else if (streq(key, "systemd.unit")) { |
82 | ||
1d84ad94 LP |
83 | if (proc_cmdline_value_missing(key, value)) |
84 | return 0; | |
85 | ||
86 | r = free_and_strdup(&arg_default_unit, value); | |
87 | if (r < 0) | |
88 | return log_error_errno(r, "Failed to set default unit %s: %m", value); | |
89 | ||
7dcc5671 EV |
90 | } else if (!value) { |
91 | const char *target; | |
92 | ||
93 | target = runlevel_to_target(key); | |
94 | if (target) { | |
95 | r = free_and_strdup(&arg_default_unit, target); | |
96 | if (r < 0) | |
97 | return log_error_errno(r, "Failed to set default unit %s: %m", target); | |
98 | } | |
326bb68c LP |
99 | } |
100 | ||
101 | return 0; | |
102 | } | |
103 | ||
104 | static int generate_mask_symlinks(void) { | |
105 | char **u; | |
106 | int r = 0; | |
107 | ||
108 | if (strv_isempty(arg_mask)) | |
109 | return 0; | |
110 | ||
111 | STRV_FOREACH(u, arg_mask) { | |
3c5a87a8 | 112 | _cleanup_free_ char *p = NULL; |
326bb68c | 113 | |
605405c6 | 114 | p = strjoin(arg_dest, "/", *u); |
326bb68c LP |
115 | if (!p) |
116 | return log_oom(); | |
117 | ||
1f6b4113 | 118 | if (symlink("/dev/null", p) < 0) |
94c156cd LP |
119 | r = log_error_errno(errno, |
120 | "Failed to create mask symlink %s: %m", | |
121 | p); | |
326bb68c LP |
122 | } |
123 | ||
124 | return r; | |
125 | } | |
126 | ||
3c5a87a8 LP |
127 | static int generate_wants_symlinks(void) { |
128 | char **u; | |
129 | int r = 0; | |
326bb68c | 130 | |
3c5a87a8 | 131 | if (strv_isempty(arg_wants)) |
326bb68c LP |
132 | return 0; |
133 | ||
3c5a87a8 LP |
134 | STRV_FOREACH(u, arg_wants) { |
135 | _cleanup_free_ char *p = NULL, *f = NULL; | |
3a8a0ace | 136 | const char *target = arg_default_unit ?: SPECIAL_DEFAULT_TARGET; |
3c5a87a8 | 137 | |
3a8a0ace | 138 | p = strjoin(arg_dest, "/", target, ".wants/", *u); |
3c5a87a8 LP |
139 | if (!p) |
140 | return log_oom(); | |
141 | ||
142 | f = strappend(SYSTEM_DATA_UNIT_PATH "/", *u); | |
143 | if (!f) | |
144 | return log_oom(); | |
326bb68c | 145 | |
3c5a87a8 | 146 | mkdir_parents_label(p, 0755); |
326bb68c | 147 | |
1f6b4113 | 148 | if (symlink(f, p) < 0) |
94c156cd LP |
149 | r = log_error_errno(errno, |
150 | "Failed to create wants symlink %s: %m", | |
151 | p); | |
326bb68c LP |
152 | } |
153 | ||
3c5a87a8 | 154 | return r; |
326bb68c LP |
155 | } |
156 | ||
157 | int main(int argc, char *argv[]) { | |
158 | int r, q; | |
159 | ||
160 | if (argc > 1 && argc != 4) { | |
161 | log_error("This program takes three or no arguments."); | |
162 | return EXIT_FAILURE; | |
163 | } | |
164 | ||
165 | if (argc > 1) | |
166 | arg_dest = argv[2]; | |
167 | ||
6c347d50 LP |
168 | log_set_prohibit_ipc(true); |
169 | log_set_target(LOG_TARGET_AUTO); | |
326bb68c LP |
170 | log_parse_environment(); |
171 | log_open(); | |
172 | ||
173 | umask(0022); | |
174 | ||
1d84ad94 | 175 | r = proc_cmdline_parse(parse_proc_cmdline_item, NULL, 0); |
b5884878 | 176 | if (r < 0) |
da927ba9 | 177 | log_warning_errno(r, "Failed to parse kernel command line, ignoring: %m"); |
326bb68c | 178 | |
3c5a87a8 LP |
179 | if (arg_debug_shell) { |
180 | r = strv_extend(&arg_wants, "debug-shell.service"); | |
181 | if (r < 0) { | |
182 | r = log_oom(); | |
183 | goto finish; | |
184 | } | |
185 | } | |
186 | ||
326bb68c LP |
187 | r = generate_mask_symlinks(); |
188 | ||
3c5a87a8 | 189 | q = generate_wants_symlinks(); |
326bb68c LP |
190 | if (q < 0) |
191 | r = q; | |
192 | ||
3c5a87a8 | 193 | finish: |
3a8a0ace | 194 | arg_default_unit = mfree(arg_default_unit); |
326bb68c | 195 | |
3a8a0ace | 196 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; |
326bb68c | 197 | } |