src/cgls/cgls.c

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