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1 | /*** | |
2 | This file is part of systemd. | |
3 | ||
4 | Copyright 2010 Lennart Poettering | |
5 | ||
6 | systemd is free software; you can redistribute it and/or modify it | |
7 | under the terms of the GNU Lesser General Public License as published by | |
8 | the Free Software Foundation; either version 2.1 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | systemd is distributed in the hope that it will be useful, but | |
12 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public License | |
17 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
18 | ***/ | |
19 | ||
20 | #include <errno.h> | |
21 | #include <getopt.h> | |
22 | #include <stdio.h> | |
23 | #include <string.h> | |
24 | #include <unistd.h> | |
25 | ||
26 | #include "sd-bus.h" | |
27 | ||
28 | #include "alloc-util.h" | |
29 | #include "bus-error.h" | |
30 | #include "bus-util.h" | |
31 | #include "cgroup-show.h" | |
32 | #include "cgroup-util.h" | |
33 | #include "fileio.h" | |
34 | #include "log.h" | |
35 | #include "output-mode.h" | |
36 | #include "pager.h" | |
37 | #include "path-util.h" | |
38 | #include "unit-name.h" | |
39 | #include "util.h" | |
40 | ||
41 | static bool arg_no_pager = false; | |
42 | static bool arg_kernel_threads = false; | |
43 | static bool arg_all = false; | |
44 | static int arg_full = -1; | |
45 | static char* arg_machine = NULL; | |
46 | ||
47 | static void help(void) { | |
48 | printf("%s [OPTIONS...] [CGROUP...]\n\n" | |
49 | "Recursively show control group contents.\n\n" | |
50 | " -h --help Show this help\n" | |
51 | " --version Show package version\n" | |
52 | " --no-pager Do not pipe output into a pager\n" | |
53 | " -a --all Show all groups, including empty\n" | |
54 | " -l --full Do not ellipsize output\n" | |
55 | " -k Include kernel threads in output\n" | |
56 | " -M --machine= Show container\n" | |
57 | , program_invocation_short_name); | |
58 | } | |
59 | ||
60 | static int parse_argv(int argc, char *argv[]) { | |
61 | ||
62 | enum { | |
63 | ARG_NO_PAGER = 0x100, | |
64 | ARG_VERSION, | |
65 | }; | |
66 | ||
67 | static const struct option options[] = { | |
68 | { "help", no_argument, NULL, 'h' }, | |
69 | { "version", no_argument, NULL, ARG_VERSION }, | |
70 | { "no-pager", no_argument, NULL, ARG_NO_PAGER }, | |
71 | { "all", no_argument, NULL, 'a' }, | |
72 | { "full", no_argument, NULL, 'l' }, | |
73 | { "machine", required_argument, NULL, 'M' }, | |
74 | {} | |
75 | }; | |
76 | ||
77 | int c; | |
78 | ||
79 | assert(argc >= 1); | |
80 | assert(argv); | |
81 | ||
82 | while ((c = getopt_long(argc, argv, "hkalM:", options, NULL)) >= 0) | |
83 | ||
84 | switch (c) { | |
85 | ||
86 | case 'h': | |
87 | help(); | |
88 | return 0; | |
89 | ||
90 | case ARG_VERSION: | |
91 | return version(); | |
92 | ||
93 | case ARG_NO_PAGER: | |
94 | arg_no_pager = true; | |
95 | break; | |
96 | ||
97 | case 'a': | |
98 | arg_all = true; | |
99 | break; | |
100 | ||
101 | case 'l': | |
102 | arg_full = true; | |
103 | break; | |
104 | ||
105 | case 'k': | |
106 | arg_kernel_threads = true; | |
107 | break; | |
108 | ||
109 | case 'M': | |
110 | arg_machine = optarg; | |
111 | break; | |
112 | ||
113 | case '?': | |
114 | return -EINVAL; | |
115 | ||
116 | default: | |
117 | assert_not_reached("Unhandled option"); | |
118 | } | |
119 | ||
120 | return 1; | |
121 | } | |
122 | ||
123 | static int get_cgroup_root(char **ret) { | |
124 | _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; | |
125 | _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL; | |
126 | _cleanup_free_ char *unit = NULL, *path = NULL; | |
127 | const char *m; | |
128 | int r; | |
129 | ||
130 | if (!arg_machine) { | |
131 | r = cg_get_root_path(ret); | |
132 | if (r == -ENOMEDIUM) | |
133 | return log_error_errno(r, "Failed to get root control group path: No cgroup filesystem mounted on /sys/fs/cgroup"); | |
134 | else if (r < 0) | |
135 | return log_error_errno(r, "Failed to get root control group path: %m"); | |
136 | ||
137 | return 0; | |
138 | } | |
139 | ||
140 | m = strjoina("/run/systemd/machines/", arg_machine); | |
141 | r = parse_env_file(m, NEWLINE, "SCOPE", &unit, NULL); | |
142 | if (r < 0) | |
143 | return log_error_errno(r, "Failed to load machine data: %m"); | |
144 | ||
145 | path = unit_dbus_path_from_name(unit); | |
146 | if (!path) | |
147 | return log_oom(); | |
148 | ||
149 | r = bus_connect_transport_systemd(BUS_TRANSPORT_LOCAL, NULL, false, &bus); | |
150 | if (r < 0) | |
151 | return log_error_errno(r, "Failed to create bus connection: %m"); | |
152 | ||
153 | r = sd_bus_get_property_string( | |
154 | bus, | |
155 | "org.freedesktop.systemd1", | |
156 | path, | |
157 | unit_dbus_interface_from_name(unit), | |
158 | "ControlGroup", | |
159 | &error, | |
160 | ret); | |
161 | if (r < 0) | |
162 | return log_error_errno(r, "Failed to query unit control group path: %s", bus_error_message(&error, r)); | |
163 | ||
164 | return 0; | |
165 | } | |
166 | ||
167 | static void show_cg_info(const char *controller, const char *path) { | |
168 | ||
169 | if (cg_unified() <= 0 && controller && !streq(controller, SYSTEMD_CGROUP_CONTROLLER)) | |
170 | printf("Controller %s; ", controller); | |
171 | ||
172 | printf("Control group %s:\n", isempty(path) ? "/" : path); | |
173 | fflush(stdout); | |
174 | } | |
175 | ||
176 | int main(int argc, char *argv[]) { | |
177 | int r, output_flags; | |
178 | ||
179 | log_parse_environment(); | |
180 | log_open(); | |
181 | ||
182 | r = parse_argv(argc, argv); | |
183 | if (r <= 0) | |
184 | goto finish; | |
185 | ||
186 | if (!arg_no_pager) { | |
187 | r = pager_open(false); | |
188 | if (r > 0 && arg_full < 0) | |
189 | arg_full = true; | |
190 | } | |
191 | ||
192 | output_flags = | |
193 | arg_all * OUTPUT_SHOW_ALL | | |
194 | (arg_full > 0) * OUTPUT_FULL_WIDTH; | |
195 | ||
196 | if (optind < argc) { | |
197 | _cleanup_free_ char *root = NULL; | |
198 | int i; | |
199 | ||
200 | r = get_cgroup_root(&root); | |
201 | if (r < 0) | |
202 | goto finish; | |
203 | ||
204 | for (i = optind; i < argc; i++) { | |
205 | int q; | |
206 | ||
207 | if (path_startswith(argv[i], "/sys/fs/cgroup")) { | |
208 | ||
209 | printf("Directory %s:\n", argv[i]); | |
210 | fflush(stdout); | |
211 | ||
212 | q = show_cgroup_by_path(argv[i], NULL, 0, arg_kernel_threads, output_flags); | |
213 | } else { | |
214 | _cleanup_free_ char *c = NULL, *p = NULL, *j = NULL; | |
215 | const char *controller, *path; | |
216 | ||
217 | r = cg_split_spec(argv[i], &c, &p); | |
218 | if (r < 0) { | |
219 | log_error_errno(r, "Failed to split argument %s: %m", argv[i]); | |
220 | goto finish; | |
221 | } | |
222 | ||
223 | controller = c ?: SYSTEMD_CGROUP_CONTROLLER; | |
224 | if (p) { | |
225 | j = strjoin(root, "/", p, NULL); | |
226 | if (!j) { | |
227 | r = log_oom(); | |
228 | goto finish; | |
229 | } | |
230 | ||
231 | path_kill_slashes(j); | |
232 | path = j; | |
233 | } else | |
234 | path = root; | |
235 | ||
236 | show_cg_info(controller, path); | |
237 | ||
238 | q = show_cgroup(controller, path, NULL, 0, arg_kernel_threads, output_flags); | |
239 | } | |
240 | ||
241 | if (q < 0) | |
242 | r = q; | |
243 | } | |
244 | ||
245 | } else { | |
246 | bool done = false; | |
247 | ||
248 | if (!arg_machine) { | |
249 | _cleanup_free_ char *cwd = NULL; | |
250 | ||
251 | cwd = get_current_dir_name(); | |
252 | if (!cwd) { | |
253 | r = log_error_errno(errno, "Cannot determine current working directory: %m"); | |
254 | goto finish; | |
255 | } | |
256 | ||
257 | if (path_startswith(cwd, "/sys/fs/cgroup")) { | |
258 | printf("Working directory %s:\n", cwd); | |
259 | fflush(stdout); | |
260 | ||
261 | r = show_cgroup_by_path(cwd, NULL, 0, arg_kernel_threads, output_flags); | |
262 | done = true; | |
263 | } | |
264 | } | |
265 | ||
266 | if (!done) { | |
267 | _cleanup_free_ char *root = NULL; | |
268 | ||
269 | r = get_cgroup_root(&root); | |
270 | if (r < 0) | |
271 | goto finish; | |
272 | ||
273 | show_cg_info(SYSTEMD_CGROUP_CONTROLLER, root); | |
274 | ||
275 | printf("-.slice\n"); | |
276 | r = show_cgroup(SYSTEMD_CGROUP_CONTROLLER, root, NULL, 0, arg_kernel_threads, output_flags); | |
277 | } | |
278 | } | |
279 | ||
280 | if (r < 0) | |
281 | log_error_errno(r, "Failed to list cgroup tree: %m"); | |
282 | ||
283 | finish: | |
284 | pager_close(); | |
285 | ||
286 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; | |
287 | } |