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-rw-r--r--src/cgls/cgls.c324
1 files changed, 324 insertions, 0 deletions
diff --git a/src/cgls/cgls.c b/src/cgls/cgls.c
new file mode 100644
index 0000000..7107d22
--- /dev/null
+++ b/src/cgls/cgls.c
@@ -0,0 +1,324 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <errno.h>
+#include <getopt.h>
+#include <stdio.h>
+#include <unistd.h>
+
+#include "sd-bus.h"
+
+#include "alloc-util.h"
+#include "bus-util.h"
+#include "cgroup-show.h"
+#include "cgroup-util.h"
+#include "fileio.h"
+#include "log.h"
+#include "main-func.h"
+#include "output-mode.h"
+#include "pager.h"
+#include "parse-util.h"
+#include "path-util.h"
+#include "pretty-print.h"
+#include "strv.h"
+#include "unit-name.h"
+#include "util.h"
+
+static PagerFlags arg_pager_flags = 0;
+static OutputFlags arg_output_flags = OUTPUT_CGROUP_XATTRS | OUTPUT_CGROUP_ID;
+
+static enum {
+ SHOW_UNIT_NONE,
+ SHOW_UNIT_SYSTEM,
+ SHOW_UNIT_USER,
+} arg_show_unit = SHOW_UNIT_NONE;
+static char **arg_names = NULL;
+
+static int arg_full = -1;
+static const char* arg_machine = NULL;
+
+STATIC_DESTRUCTOR_REGISTER(arg_names, freep); /* don't free the strings */
+
+static int help(void) {
+ _cleanup_free_ char *link = NULL;
+ int r;
+
+ r = terminal_urlify_man("systemd-cgls", "1", &link);
+ if (r < 0)
+ return log_oom();
+
+ printf("%s [OPTIONS...] [CGROUP...]\n\n"
+ "Recursively show control group contents.\n\n"
+ " -h --help Show this help\n"
+ " --version Show package version\n"
+ " --no-pager Do not pipe output into a pager\n"
+ " -a --all Show all groups, including empty\n"
+ " -u --unit Show the subtrees of specified system units\n"
+ " --user-unit Show the subtrees of specified user units\n"
+ " --xattr=BOOL Show cgroup extended attributes\n"
+ " --cgroup-id=BOOL Show cgroup ID\n"
+ " -l --full Do not ellipsize output\n"
+ " -k Include kernel threads in output\n"
+ " -M --machine= Show container\n"
+ "\nSee the %s for details.\n",
+ program_invocation_short_name,
+ link);
+
+ return 0;
+}
+
+static int parse_argv(int argc, char *argv[]) {
+
+ enum {
+ ARG_NO_PAGER = 0x100,
+ ARG_VERSION,
+ ARG_USER_UNIT,
+ ARG_XATTR,
+ ARG_CGROUP_ID,
+ };
+
+ static const struct option options[] = {
+ { "help", no_argument, NULL, 'h' },
+ { "version", no_argument, NULL, ARG_VERSION },
+ { "no-pager", no_argument, NULL, ARG_NO_PAGER },
+ { "all", no_argument, NULL, 'a' },
+ { "full", no_argument, NULL, 'l' },
+ { "machine", required_argument, NULL, 'M' },
+ { "unit", optional_argument, NULL, 'u' },
+ { "user-unit", optional_argument, NULL, ARG_USER_UNIT },
+ { "xattr", required_argument, NULL, ARG_XATTR },
+ { "cgroup-id", required_argument, NULL, ARG_CGROUP_ID },
+ {}
+ };
+
+ int c, r;
+
+ assert(argc >= 1);
+ assert(argv);
+
+ /* Resetting to 0 forces the invocation of an internal initialization routine of getopt_long()
+ * that checks for GNU extensions in optstring ('-' or '+' at the beginning). */
+ optind = 0;
+ while ((c = getopt_long(argc, argv, "-hkalM:u::", options, NULL)) >= 0)
+
+ switch (c) {
+
+ case 'h':
+ return help();
+
+ case ARG_VERSION:
+ return version();
+
+ case ARG_NO_PAGER:
+ arg_pager_flags |= PAGER_DISABLE;
+ break;
+
+ case 'a':
+ arg_output_flags |= OUTPUT_SHOW_ALL;
+ break;
+
+ case 'u':
+ arg_show_unit = SHOW_UNIT_SYSTEM;
+ if (strv_push(&arg_names, optarg) < 0) /* push optarg if not empty */
+ return log_oom();
+ break;
+
+ case ARG_USER_UNIT:
+ arg_show_unit = SHOW_UNIT_USER;
+ if (strv_push(&arg_names, optarg) < 0) /* push optarg if not empty */
+ return log_oom();
+ break;
+
+ case 1:
+ /* positional argument */
+ if (strv_push(&arg_names, optarg) < 0)
+ return log_oom();
+ break;
+
+ case 'l':
+ arg_full = true;
+ break;
+
+ case 'k':
+ arg_output_flags |= OUTPUT_KERNEL_THREADS;
+ break;
+
+ case 'M':
+ arg_machine = optarg;
+ break;
+
+ case ARG_XATTR:
+ r = parse_boolean(optarg);
+ if (r < 0)
+ return log_error_errno(r, "Failed to parse --xattr= value: %s", optarg);
+
+ SET_FLAG(arg_output_flags, OUTPUT_CGROUP_XATTRS, r);
+ break;
+
+ case ARG_CGROUP_ID:
+ r = parse_boolean(optarg);
+ if (r < 0)
+ return log_error_errno(r, "Failed to parse --cgroup-id= value: %s", optarg);
+
+ SET_FLAG(arg_output_flags, OUTPUT_CGROUP_ID, r);
+ break;
+
+ case '?':
+ return -EINVAL;
+
+ default:
+ assert_not_reached();
+ }
+
+ if (arg_machine && arg_show_unit != SHOW_UNIT_NONE)
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+ "Cannot combine --unit or --user-unit with --machine=.");
+
+ return 1;
+}
+
+static void show_cg_info(const char *controller, const char *path) {
+
+ if (cg_all_unified() == 0 && controller && !streq(controller, SYSTEMD_CGROUP_CONTROLLER))
+ printf("Controller %s; ", controller);
+
+ printf("Control group %s:\n", empty_to_root(path));
+ fflush(stdout);
+}
+
+static int run(int argc, char *argv[]) {
+ int r;
+
+ log_setup();
+
+ r = parse_argv(argc, argv);
+ if (r <= 0)
+ return r;
+
+ pager_open(arg_pager_flags);
+ if (arg_full < 0 && pager_have())
+ arg_full = true;
+
+ if (arg_full > 0)
+ arg_output_flags |= OUTPUT_FULL_WIDTH;
+
+ if (arg_names) {
+ _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
+ _cleanup_free_ char *root = NULL;
+
+ STRV_FOREACH(name, arg_names) {
+ int q;
+
+ if (arg_show_unit != SHOW_UNIT_NONE) {
+ /* Command line arguments are unit names */
+ _cleanup_free_ char *cgroup = NULL, *unit_name = NULL;
+
+ r = unit_name_mangle(*name, UNIT_NAME_MANGLE_WARN, &unit_name);
+ if (r < 0)
+ return log_error_errno(r, "Failed to mangle unit name: %m");
+
+ if (!bus) {
+ /* Connect to the bus only if necessary */
+ r = bus_connect_transport_systemd(BUS_TRANSPORT_LOCAL, NULL,
+ arg_show_unit == SHOW_UNIT_USER,
+ &bus);
+ if (r < 0)
+ return bus_log_connect_error(r, BUS_TRANSPORT_LOCAL);
+ }
+
+ q = show_cgroup_get_unit_path_and_warn(bus, unit_name, &cgroup);
+ if (q < 0)
+ goto failed;
+
+ if (isempty(cgroup)) {
+ q = log_warning_errno(SYNTHETIC_ERRNO(ENOENT), "Unit %s not found.", unit_name);
+ goto failed;
+ }
+
+ printf("Unit %s (%s):\n", unit_name, cgroup);
+ fflush(stdout);
+
+ q = show_cgroup_by_path(cgroup, NULL, 0, arg_output_flags);
+
+ } else if (path_startswith(*name, "/sys/fs/cgroup")) {
+
+ printf("Directory %s:\n", *name);
+ fflush(stdout);
+
+ q = show_cgroup_by_path(*name, NULL, 0, arg_output_flags);
+ } else {
+ _cleanup_free_ char *c = NULL, *p = NULL, *j = NULL;
+ const char *controller, *path;
+
+ if (!root) {
+ /* Query root only if needed, treat error as fatal */
+ r = show_cgroup_get_path_and_warn(arg_machine, NULL, &root);
+ if (r < 0)
+ return log_error_errno(r, "Failed to list cgroup tree: %m");
+ }
+
+ q = cg_split_spec(*name, &c, &p);
+ if (q < 0) {
+ log_error_errno(q, "Failed to split argument %s: %m", *name);
+ goto failed;
+ }
+
+ controller = c ?: SYSTEMD_CGROUP_CONTROLLER;
+ if (p) {
+ j = path_join(root, p);
+ if (!j)
+ return log_oom();
+
+ path_simplify(j);
+ path = j;
+ } else
+ path = root;
+
+ show_cg_info(controller, path);
+
+ q = show_cgroup(controller, path, NULL, 0, arg_output_flags);
+ }
+
+ failed:
+ if (q < 0 && r >= 0)
+ r = q;
+ }
+
+ } else {
+ bool done = false;
+
+ if (!arg_machine) {
+ _cleanup_free_ char *cwd = NULL;
+
+ r = safe_getcwd(&cwd);
+ if (r < 0)
+ return log_error_errno(r, "Cannot determine current working directory: %m");
+
+ if (path_startswith(cwd, "/sys/fs/cgroup")) {
+ printf("Working directory %s:\n", cwd);
+ fflush(stdout);
+
+ r = show_cgroup_by_path(cwd, NULL, 0, arg_output_flags);
+ done = true;
+ }
+ }
+
+ if (!done) {
+ _cleanup_free_ char *root = NULL;
+
+ r = show_cgroup_get_path_and_warn(arg_machine, NULL, &root);
+ if (r < 0)
+ return log_error_errno(r, "Failed to list cgroup tree: %m");
+
+ show_cg_info(SYSTEMD_CGROUP_CONTROLLER, root);
+
+ printf("-.slice\n");
+ r = show_cgroup(SYSTEMD_CGROUP_CONTROLLER, root, NULL, 0, arg_output_flags);
+ }
+ }
+ if (r < 0)
+ return log_error_errno(r, "Failed to list cgroup tree: %m");
+
+ return 0;
+}
+
+DEFINE_MAIN_FUNCTION(run);
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-23 06:31:27 +0000