src/cgls/cgls.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 /***
   3   This file is part of systemd.
   4
   5   Copyright 2010 Lennart Poettering
   6 ***/
   7
   8 #include <errno.h>
   9 #include <getopt.h>
  10 #include <stdio.h>
  11 #include <string.h>
  12 #include <unistd.h>
  13
  14 #include "sd-bus.h"
  15
  16 #include "alloc-util.h"
  17 #include "bus-util.h"
  18 #include "cgroup-show.h"
  19 #include "cgroup-util.h"
  20 #include "fileio.h"
  21 #include "log.h"
  22 #include "output-mode.h"
  23 #include "pager.h"
  24 #include "path-util.h"
  25 #include "strv.h"
  26 #include "unit-name.h"
  27 #include "util.h"
  28
  29 static bool arg_no_pager = false;
  30 static bool arg_kernel_threads = false;
  31 static bool arg_all = false;
  32
  33 static enum {
  34         SHOW_UNIT_NONE,
  35         SHOW_UNIT_SYSTEM,
  36         SHOW_UNIT_USER,
  37 } arg_show_unit = SHOW_UNIT_NONE;
  38 static char **arg_names = NULL;
  39
  40 static int arg_full = -1;
  41 static char* arg_machine = NULL;
  42
  43 static void help(void) {
  44         printf("%s [OPTIONS...] [CGROUP...]\n\n"
  45                "Recursively show control group contents.\n\n"
  46                "  -h --help           Show this help\n"
  47                "     --version        Show package version\n"
  48                "     --no-pager       Do not pipe output into a pager\n"
  49                "  -a --all            Show all groups, including empty\n"
  50                "  -u --unit           Show the subtrees of specifified system units\n"
  51                "     --user-unit      Show the subtrees of specifified user units\n"
  52                "  -l --full           Do not ellipsize output\n"
  53                "  -k                  Include kernel threads in output\n"
  54                "  -M --machine=       Show container\n"
  55                , program_invocation_short_name);
  56 }
  57
  58 static int parse_argv(int argc, char *argv[]) {
  59
  60         enum {
  61                 ARG_NO_PAGER = 0x100,
  62                 ARG_VERSION,
  63                 ARG_USER_UNIT,
  64         };
  65
  66         static const struct option options[] = {
  67                 { "help",      no_argument,       NULL, 'h'           },
  68                 { "version",   no_argument,       NULL, ARG_VERSION   },
  69                 { "no-pager",  no_argument,       NULL, ARG_NO_PAGER  },
  70                 { "all",       no_argument,       NULL, 'a'           },
  71                 { "full",      no_argument,       NULL, 'l'           },
  72                 { "machine",   required_argument, NULL, 'M'           },
  73                 { "unit",      optional_argument, NULL, 'u'           },
  74                 { "user-unit", optional_argument, NULL, ARG_USER_UNIT },
  75                 {}
  76         };
  77
  78         int c;
  79
  80         assert(argc >= 1);
  81         assert(argv);
  82
  83         while ((c = getopt_long(argc, argv, "-hkalM:u::", options, NULL)) >= 0)
  84
  85                 switch (c) {
  86
  87                 case 'h':
  88                         help();
  89                         return 0;
  90
  91                 case ARG_VERSION:
  92                         return version();
  93
  94                 case ARG_NO_PAGER:
  95                         arg_no_pager = true;
  96                         break;
  97
  98                 case 'a':
  99                         arg_all = true;
 100                         break;
 101
 102                 case 'u':
 103                         arg_show_unit = SHOW_UNIT_SYSTEM;
 104                         if (strv_push(&arg_names, optarg) < 0) /* push optarg if not empty */
 105                                 return log_oom();
 106                         break;
 107
 108                 case ARG_USER_UNIT:
 109                         arg_show_unit = SHOW_UNIT_USER;
 110                         if (strv_push(&arg_names, optarg) < 0) /* push optarg if not empty */
 111                                 return log_oom();
 112                         break;
 113
 114                 case 1:
 115                         /* positional argument */
 116                         if (strv_push(&arg_names, optarg) < 0)
 117                                 return log_oom();
 118                         break;
 119
 120                 case 'l':
 121                         arg_full = true;
 122                         break;
 123
 124                 case 'k':
 125                         arg_kernel_threads = true;
 126                         break;
 127
 128                 case 'M':
 129                         arg_machine = optarg;
 130                         break;
 131
 132                 case '?':
 133                         return -EINVAL;
 134
 135                 default:
 136                         assert_not_reached("Unhandled option");
 137                 }
 138
 139         if (arg_machine && arg_show_unit != SHOW_UNIT_NONE) {
 140                 log_error("Cannot combine --unit or --user-unit with --machine=.");
 141                 return -EINVAL;
 142         }
 143
 144         return 1;
 145 }
 146
 147 static void show_cg_info(const char *controller, const char *path) {
 148
 149         if (cg_all_unified() == 0 && controller && !streq(controller, SYSTEMD_CGROUP_CONTROLLER))
 150                 printf("Controller %s; ", controller);
 151
 152         printf("Control group %s:\n", empty_to_root(path));
 153         fflush(stdout);
 154 }
 155
 156 int main(int argc, char *argv[]) {
 157         int r, output_flags;
 158
 159         log_parse_environment();
 160         log_open();
 161
 162         r = parse_argv(argc, argv);
 163         if (r <= 0)
 164                 goto finish;
 165
 166         r = pager_open(arg_no_pager, false);
 167         if (r > 0 && arg_full < 0)
 168                 arg_full = true;
 169
 170         output_flags =
 171                 arg_all * OUTPUT_SHOW_ALL |
 172                 (arg_full > 0) * OUTPUT_FULL_WIDTH |
 173                 arg_kernel_threads * OUTPUT_KERNEL_THREADS;
 174
 175         if (arg_names) {
 176                 _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
 177                 _cleanup_free_ char *root = NULL;
 178                 char **name;
 179
 180                 STRV_FOREACH(name, arg_names) {
 181                         int q;
 182
 183                         if (arg_show_unit != SHOW_UNIT_NONE) {
 184                                 /* Command line arguments are unit names */
 185                                 _cleanup_free_ char *cgroup = NULL;
 186
 187                                 if (!bus) {
 188                                         /* Connect to the bus only if necessary */
 189                                         r = bus_connect_transport_systemd(BUS_TRANSPORT_LOCAL, NULL,
 190                                                                           arg_show_unit == SHOW_UNIT_USER,
 191                                                                           &bus);
 192                                         if (r < 0) {
 193                                                 log_error_errno(r, "Failed to create bus connection: %m");
 194                                                 goto finish;
 195                                         }
 196                                 }
 197
 198                                 q = show_cgroup_get_unit_path_and_warn(bus, *name, &cgroup);
 199                                 if (q < 0)
 200                                         goto failed;
 201
 202                                 if (isempty(cgroup)) {
 203                                         log_warning("Unit %s not found.", *name);
 204                                         q = -ENOENT;
 205                                         goto failed;
 206                                 }
 207
 208                                 printf("Unit %s (%s):\n", *name, cgroup);
 209                                 fflush(stdout);
 210
 211                                 q = show_cgroup_by_path(cgroup, NULL, 0, output_flags);
 212
 213                         } else if (path_startswith(*name, "/sys/fs/cgroup")) {
 214
 215                                 printf("Directory %s:\n", *name);
 216                                 fflush(stdout);
 217
 218                                 q = show_cgroup_by_path(*name, NULL, 0, output_flags);
 219                         } else {
 220                                 _cleanup_free_ char *c = NULL, *p = NULL, *j = NULL;
 221                                 const char *controller, *path;
 222
 223                                 if (!root) {
 224                                         /* Query root only if needed, treat error as fatal */
 225                                         r = show_cgroup_get_path_and_warn(arg_machine, NULL, &root);
 226                                         if (r < 0)
 227                                                 goto finish;
 228                                 }
 229
 230                                 q = cg_split_spec(*name, &c, &p);
 231                                 if (q < 0) {
 232                                         log_error_errno(q, "Failed to split argument %s: %m", *name);
 233                                         goto failed;
 234                                 }
 235
 236                                 controller = c ?: SYSTEMD_CGROUP_CONTROLLER;
 237                                 if (p) {
 238                                         j = strjoin(root, "/", p);
 239                                         if (!j) {
 240                                                 r = log_oom();
 241                                                 goto finish;
 242                                         }
 243
 244                                         path_simplify(j, false);
 245                                         path = j;
 246                                 } else
 247                                         path = root;
 248
 249                                 show_cg_info(controller, path);
 250
 251                                 q = show_cgroup(controller, path, NULL, 0, output_flags);
 252                         }
 253
 254                 failed:
 255                         if (q < 0 && r >= 0)
 256                                 r = q;
 257                 }
 258
 259         } else {
 260                 bool done = false;
 261
 262                 if (!arg_machine)  {
 263                         _cleanup_free_ char *cwd = NULL;
 264
 265                         r = safe_getcwd(&cwd);
 266                         if (r < 0) {
 267                                 log_error_errno(r, "Cannot determine current working directory: %m");
 268                                 goto finish;
 269                         }
 270
 271                         if (path_startswith(cwd, "/sys/fs/cgroup")) {
 272                                 printf("Working directory %s:\n", cwd);
 273                                 fflush(stdout);
 274
 275                                 r = show_cgroup_by_path(cwd, NULL, 0, output_flags);
 276                                 done = true;
 277                         }
 278                 }
 279
 280                 if (!done) {
 281                         _cleanup_free_ char *root = NULL;
 282
 283                         r = show_cgroup_get_path_and_warn(arg_machine, NULL, &root);
 284                         if (r < 0)
 285                                 goto finish;
 286
 287                         show_cg_info(SYSTEMD_CGROUP_CONTROLLER, root);
 288
 289                         printf("-.slice\n");
 290                         r = show_cgroup(SYSTEMD_CGROUP_CONTROLLER, root, NULL, 0, output_flags);
 291                 }
 292         }
 293
 294         if (r < 0)
 295                 log_error_errno(r, "Failed to list cgroup tree: %m");
 296
 297 finish:
 298         pager_close();
 299         free(arg_names); /* don't free the strings */
 300
 301         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
 302 }