317 lines
11 KiB
C
317 lines
11 KiB
C
/***
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <errno.h>
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#include <getopt.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include "sd-bus.h"
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#include "alloc-util.h"
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#include "bus-util.h"
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#include "cgroup-show.h"
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#include "cgroup-util.h"
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#include "fileio.h"
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#include "log.h"
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#include "output-mode.h"
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#include "pager.h"
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#include "path-util.h"
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#include "strv.h"
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#include "unit-name.h"
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#include "util.h"
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static bool arg_no_pager = false;
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static bool arg_kernel_threads = false;
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static bool arg_all = false;
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static enum {
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SHOW_UNIT_NONE,
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SHOW_UNIT_SYSTEM,
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SHOW_UNIT_USER,
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} arg_show_unit = SHOW_UNIT_NONE;
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static char **arg_names = NULL;
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static int arg_full = -1;
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static char* arg_machine = NULL;
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static void help(void) {
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printf("%s [OPTIONS...] [CGROUP...]\n\n"
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"Recursively show control group contents.\n\n"
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" -h --help Show this help\n"
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" --version Show package version\n"
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" --no-pager Do not pipe output into a pager\n"
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" -a --all Show all groups, including empty\n"
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" -u --unit Show the subtrees of specifified system units\n"
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" --user-unit Show the subtrees of specifified user units\n"
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" -l --full Do not ellipsize output\n"
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" -k Include kernel threads in output\n"
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" -M --machine= Show container\n"
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, program_invocation_short_name);
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}
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static int parse_argv(int argc, char *argv[]) {
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enum {
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ARG_NO_PAGER = 0x100,
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ARG_VERSION,
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ARG_USER_UNIT,
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};
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static const struct option options[] = {
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{ "help", no_argument, NULL, 'h' },
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{ "version", no_argument, NULL, ARG_VERSION },
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{ "no-pager", no_argument, NULL, ARG_NO_PAGER },
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{ "all", no_argument, NULL, 'a' },
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{ "full", no_argument, NULL, 'l' },
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{ "machine", required_argument, NULL, 'M' },
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{ "unit", optional_argument, NULL, 'u' },
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{ "user-unit", optional_argument, NULL, ARG_USER_UNIT },
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{}
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};
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int c;
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assert(argc >= 1);
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assert(argv);
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while ((c = getopt_long(argc, argv, "-hkalM:u::", options, NULL)) >= 0)
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switch (c) {
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case 'h':
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help();
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return 0;
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case ARG_VERSION:
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return version();
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case ARG_NO_PAGER:
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arg_no_pager = true;
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break;
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case 'a':
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arg_all = true;
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break;
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case 'u':
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arg_show_unit = SHOW_UNIT_SYSTEM;
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if (strv_push(&arg_names, optarg) < 0) /* push optarg if not empty */
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return log_oom();
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break;
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case ARG_USER_UNIT:
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arg_show_unit = SHOW_UNIT_USER;
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if (strv_push(&arg_names, optarg) < 0) /* push optarg if not empty */
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return log_oom();
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break;
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case 1:
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/* positional argument */
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if (strv_push(&arg_names, optarg) < 0)
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return log_oom();
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break;
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case 'l':
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arg_full = true;
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break;
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case 'k':
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arg_kernel_threads = true;
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break;
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case 'M':
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arg_machine = optarg;
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break;
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case '?':
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return -EINVAL;
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default:
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assert_not_reached("Unhandled option");
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}
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if (arg_machine && arg_show_unit != SHOW_UNIT_NONE) {
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log_error("Cannot combine --unit or --user-unit with --machine=.");
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return -EINVAL;
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}
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return 1;
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}
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static void show_cg_info(const char *controller, const char *path) {
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if (!cg_all_unified() && controller && !streq(controller, SYSTEMD_CGROUP_CONTROLLER))
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printf("Controller %s; ", controller);
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printf("Control group %s:\n", isempty(path) ? "/" : path);
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fflush(stdout);
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}
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int main(int argc, char *argv[]) {
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int r, output_flags;
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log_parse_environment();
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log_open();
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r = parse_argv(argc, argv);
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if (r <= 0)
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goto finish;
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if (!arg_no_pager) {
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r = pager_open(arg_no_pager, false);
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if (r > 0 && arg_full < 0)
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arg_full = true;
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}
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output_flags =
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arg_all * OUTPUT_SHOW_ALL |
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(arg_full > 0) * OUTPUT_FULL_WIDTH |
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arg_kernel_threads * OUTPUT_KERNEL_THREADS;
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if (arg_names) {
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_cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
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_cleanup_free_ char *root = NULL;
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char **name;
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STRV_FOREACH(name, arg_names) {
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int q;
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if (arg_show_unit != SHOW_UNIT_NONE) {
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/* Command line arguments are unit names */
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_cleanup_free_ char *cgroup = NULL;
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if (!bus) {
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/* Connect to the bus only if necessary */
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r = bus_connect_transport_systemd(BUS_TRANSPORT_LOCAL, NULL,
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arg_show_unit == SHOW_UNIT_USER,
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&bus);
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if (r < 0) {
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log_error_errno(r, "Failed to create bus connection: %m");
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goto finish;
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}
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}
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q = show_cgroup_get_unit_path_and_warn(bus, *name, &cgroup);
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if (q < 0)
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goto failed;
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if (isempty(cgroup)) {
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log_warning("Unit %s not found.", *name);
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q = -ENOENT;
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goto failed;
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}
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printf("Unit %s (%s):\n", *name, cgroup);
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fflush(stdout);
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q = show_cgroup_by_path(cgroup, NULL, 0, output_flags);
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} else if (path_startswith(*name, "/sys/fs/cgroup")) {
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printf("Directory %s:\n", *name);
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fflush(stdout);
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q = show_cgroup_by_path(*name, NULL, 0, output_flags);
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} else {
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_cleanup_free_ char *c = NULL, *p = NULL, *j = NULL;
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const char *controller, *path;
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if (!root) {
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/* Query root only if needed, treat error as fatal */
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r = show_cgroup_get_path_and_warn(arg_machine, NULL, &root);
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if (r < 0)
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goto finish;
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}
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q = cg_split_spec(*name, &c, &p);
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if (q < 0) {
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log_error_errno(q, "Failed to split argument %s: %m", *name);
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goto failed;
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}
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controller = c ?: SYSTEMD_CGROUP_CONTROLLER;
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if (p) {
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j = strjoin(root, "/", p);
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if (!j) {
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r = log_oom();
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goto finish;
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}
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path_kill_slashes(j);
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path = j;
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} else
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path = root;
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show_cg_info(controller, path);
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q = show_cgroup(controller, path, NULL, 0, output_flags);
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}
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failed:
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if (q < 0 && r >= 0)
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r = q;
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}
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} else {
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bool done = false;
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if (!arg_machine) {
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_cleanup_free_ char *cwd = NULL;
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cwd = get_current_dir_name();
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if (!cwd) {
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r = log_error_errno(errno, "Cannot determine current working directory: %m");
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goto finish;
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}
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if (path_startswith(cwd, "/sys/fs/cgroup")) {
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printf("Working directory %s:\n", cwd);
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fflush(stdout);
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r = show_cgroup_by_path(cwd, NULL, 0, output_flags);
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done = true;
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}
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}
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if (!done) {
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_cleanup_free_ char *root = NULL;
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r = show_cgroup_get_path_and_warn(arg_machine, NULL, &root);
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if (r < 0)
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goto finish;
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show_cg_info(SYSTEMD_CGROUP_CONTROLLER, root);
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printf("-.slice\n");
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r = show_cgroup(SYSTEMD_CGROUP_CONTROLLER, root, NULL, 0, output_flags);
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}
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}
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if (r < 0)
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log_error_errno(r, "Failed to list cgroup tree: %m");
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finish:
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pager_close();
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free(arg_names); /* don't free the strings */
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return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
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}
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