src/cgls/cgls.c

   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-util.h"
  30 #include "cgroup-show.h"
  31 #include "cgroup-util.h"
  32 #include "fileio.h"
  33 #include "log.h"
  34 #include "output-mode.h"
  35 #include "pager.h"
  36 #include "path-util.h"
  37 #include "strv.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
  45 static enum {
  46         SHOW_UNIT_NONE,
  47         SHOW_UNIT_SYSTEM,
  48         SHOW_UNIT_USER,
  49 } arg_show_unit = SHOW_UNIT_NONE;
  50 static char **arg_names = NULL;
  51
  52 static int arg_full = -1;
  53 static char* arg_machine = NULL;
  54
  55 static void help(void) {
  56         printf("%s [OPTIONS...] [CGROUP...]\n\n"
  57                "Recursively show control group contents.\n\n"
  58                "  -h --help           Show this help\n"
  59                "     --version        Show package version\n"
  60                "     --no-pager       Do not pipe output into a pager\n"
  61                "  -a --all            Show all groups, including empty\n"
  62                "  -u --unit           Show the subtrees of specifified system units\n"
  63                "     --user-unit      Show the subtrees of specifified user units\n"
  64                "  -l --full           Do not ellipsize output\n"
  65                "  -k                  Include kernel threads in output\n"
  66                "  -M --machine=       Show container\n"
  67                , program_invocation_short_name);
  68 }
  69
  70 static int parse_argv(int argc, char *argv[]) {
  71
  72         enum {
  73                 ARG_NO_PAGER = 0x100,
  74                 ARG_VERSION,
  75                 ARG_USER_UNIT,
  76         };
  77
  78         static const struct option options[] = {
  79                 { "help",      no_argument,       NULL, 'h'           },
  80                 { "version",   no_argument,       NULL, ARG_VERSION   },
  81                 { "no-pager",  no_argument,       NULL, ARG_NO_PAGER  },
  82                 { "all",       no_argument,       NULL, 'a'           },
  83                 { "full",      no_argument,       NULL, 'l'           },
  84                 { "machine",   required_argument, NULL, 'M'           },
  85                 { "unit",      optional_argument, NULL, 'u'           },
  86                 { "user-unit", optional_argument, NULL, ARG_USER_UNIT },
  87                 {}
  88         };
  89
  90         int c;
  91
  92         assert(argc >= 1);
  93         assert(argv);
  94
  95         while ((c = getopt_long(argc, argv, "-hkalM:u::", options, NULL)) >= 0)
  96
  97                 switch (c) {
  98
  99                 case 'h':
 100                         help();
 101                         return 0;
 102
 103                 case ARG_VERSION:
 104                         return version();
 105
 106                 case ARG_NO_PAGER:
 107                         arg_no_pager = true;
 108                         break;
 109
 110                 case 'a':
 111                         arg_all = true;
 112                         break;
 113
 114                 case 'u':
 115                         arg_show_unit = SHOW_UNIT_SYSTEM;
 116                         if (strv_push(&arg_names, optarg) < 0) /* push optarg if not empty */
 117                                 return log_oom();
 118                         break;
 119
 120                 case ARG_USER_UNIT:
 121                         arg_show_unit = SHOW_UNIT_USER;
 122                         if (strv_push(&arg_names, optarg) < 0) /* push optarg if not empty */
 123                                 return log_oom();
 124                         break;
 125
 126                 case 1:
 127                         /* positional argument */
 128                         if (strv_push(&arg_names, optarg) < 0)
 129                                 return log_oom();
 130                         break;
 131
 132                 case 'l':
 133                         arg_full = true;
 134                         break;
 135
 136                 case 'k':
 137                         arg_kernel_threads = true;
 138                         break;
 139
 140                 case 'M':
 141                         arg_machine = optarg;
 142                         break;
 143
 144                 case '?':
 145                         return -EINVAL;
 146
 147                 default:
 148                         assert_not_reached("Unhandled option");
 149                 }
 150
 151         if (arg_machine && arg_show_unit != SHOW_UNIT_NONE) {
 152                 log_error("Cannot combine --unit or --user-unit with --machine=.");
 153                 return -EINVAL;
 154         }
 155
 156         return 1;
 157 }
 158
 159 static void show_cg_info(const char *controller, const char *path) {
 160
 161         if (cg_all_unified() <= 0 && controller && !streq(controller, SYSTEMD_CGROUP_CONTROLLER))
 162                 printf("Controller %s; ", controller);
 163
 164         printf("Control group %s:\n", isempty(path) ? "/" : path);
 165         fflush(stdout);
 166 }
 167
 168 int main(int argc, char *argv[]) {
 169         int r, output_flags;
 170
 171         log_parse_environment();
 172         log_open();
 173
 174         r = parse_argv(argc, argv);
 175         if (r <= 0)
 176                 goto finish;
 177
 178         if (!arg_no_pager) {
 179                 r = pager_open(arg_no_pager, false);
 180                 if (r > 0 && arg_full < 0)
 181                         arg_full = true;
 182         }
 183
 184         output_flags =
 185                 arg_all * OUTPUT_SHOW_ALL |
 186                 (arg_full > 0) * OUTPUT_FULL_WIDTH |
 187                 arg_kernel_threads * OUTPUT_KERNEL_THREADS;
 188
 189         if (arg_names) {
 190                 _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
 191                 _cleanup_free_ char *root = NULL;
 192                 char **name;
 193
 194                 STRV_FOREACH(name, arg_names) {
 195                         int q;
 196
 197                         if (arg_show_unit != SHOW_UNIT_NONE) {
 198                                 /* Command line arguments are unit names */
 199                                 _cleanup_free_ char *cgroup = NULL;
 200
 201                                 if (!bus) {
 202                                         /* Connect to the bus only if necessary */
 203                                         r = bus_connect_transport_systemd(BUS_TRANSPORT_LOCAL, NULL,
 204                                                                           arg_show_unit == SHOW_UNIT_USER,
 205                                                                           &bus);
 206                                         if (r < 0) {
 207                                                 log_error_errno(r, "Failed to create bus connection: %m");
 208                                                 goto finish;
 209                                         }
 210                                 }
 211
 212                                 q = show_cgroup_get_unit_path_and_warn(bus, *name, &cgroup);
 213                                 if (q < 0)
 214                                         goto failed;
 215
 216                                 if (isempty(cgroup)) {
 217                                         log_warning("Unit %s not found.", *name);
 218                                         q = -ENOENT;
 219                                         goto failed;
 220                                 }
 221
 222                                 printf("Unit %s (%s):\n", *name, cgroup);
 223                                 fflush(stdout);
 224
 225                                 q = show_cgroup_by_path(cgroup, NULL, 0, output_flags);
 226
 227                         } else if (path_startswith(*name, "/sys/fs/cgroup")) {
 228
 229                                 printf("Directory %s:\n", *name);
 230                                 fflush(stdout);
 231
 232                                 q = show_cgroup_by_path(*name, NULL, 0, output_flags);
 233                         } else {
 234                                 _cleanup_free_ char *c = NULL, *p = NULL, *j = NULL;
 235                                 const char *controller, *path;
 236
 237                                 if (!root) {
 238                                         /* Query root only if needed, treat error as fatal */
 239                                         r = show_cgroup_get_path_and_warn(arg_machine, NULL, &root);
 240                                         if (r < 0)
 241                                                 goto finish;
 242                                 }
 243
 244                                 q = cg_split_spec(*name, &c, &p);
 245                                 if (q < 0) {
 246                                         log_error_errno(q, "Failed to split argument %s: %m", *name);
 247                                         goto failed;
 248                                 }
 249
 250                                 controller = c ?: SYSTEMD_CGROUP_CONTROLLER;
 251                                 if (p) {
 252                                         j = strjoin(root, "/", p);
 253                                         if (!j) {
 254                                                 r = log_oom();
 255                                                 goto finish;
 256                                         }
 257
 258                                         path_kill_slashes(j);
 259                                         path = j;
 260                                 } else
 261                                         path = root;
 262
 263                                 show_cg_info(controller, path);
 264
 265                                 q = show_cgroup(controller, path, NULL, 0, output_flags);
 266                         }
 267
 268                 failed:
 269                         if (q < 0 && r >= 0)
 270                                 r = q;
 271                 }
 272
 273         } else {
 274                 bool done = false;
 275
 276                 if (!arg_machine)  {
 277                         _cleanup_free_ char *cwd = NULL;
 278
 279                         cwd = get_current_dir_name();
 280                         if (!cwd) {
 281                                 r = log_error_errno(errno, "Cannot determine current working directory: %m");
 282                                 goto finish;
 283                         }
 284
 285                         if (path_startswith(cwd, "/sys/fs/cgroup")) {
 286                                 printf("Working directory %s:\n", cwd);
 287                                 fflush(stdout);
 288
 289                                 r = show_cgroup_by_path(cwd, NULL, 0, output_flags);
 290                                 done = true;
 291                         }
 292                 }
 293
 294                 if (!done) {
 295                         _cleanup_free_ char *root = NULL;
 296
 297                         r = show_cgroup_get_path_and_warn(arg_machine, NULL, &root);
 298                         if (r < 0)
 299                                 goto finish;
 300
 301                         show_cg_info(SYSTEMD_CGROUP_CONTROLLER, root);
 302
 303                         printf("-.slice\n");
 304                         r = show_cgroup(SYSTEMD_CGROUP_CONTROLLER, root, NULL, 0, output_flags);
 305                 }
 306         }
 307
 308         if (r < 0)
 309                 log_error_errno(r, "Failed to list cgroup tree: %m");
 310
 311 finish:
 312         pager_close();
 313         free(arg_names); /* don't free the strings */
 314
 315         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
 316 }