Adding upstream version 255.4.upstream/255.4

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 329 insertions, 0 deletions

diff --git a/src/cgls/cgls.c b/src/cgls/cgls.c
new file mode 100644
index 0000000..70fa260
--- /dev/null
+++ b/src/cgls/cgls.c
@@ -0,0 +1,329 @@
+/* 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 "build.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"
+
+static PagerFlags arg_pager_flags = 0;
+static OutputFlags arg_output_flags = 0;
+
+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"
+               "  -x --xattr=BOOL     Show cgroup extended attributes\n"
+               "  -c --cgroup-id=BOOL Show cgroup ID\n"
+               "  -l --full           Do not ellipsize output\n"
+               "  -k                  Include kernel threads in output\n"
+               "  -M --machine=NAME   Show container NAME\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,
+        };
+
+        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, 'x'           },
+                { "cgroup-id", required_argument, NULL, 'c'           },
+                {}
+        };
+
+        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::xc", 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 'x':
+                        if (optarg) {
+                                r = parse_boolean(optarg);
+                                if (r < 0)
+                                        return log_error_errno(r, "Failed to parse --xattr= value: %s", optarg);
+                        } else
+                                r = true;
+
+                        SET_FLAG(arg_output_flags, OUTPUT_CGROUP_XATTRS, r);
+                        break;
+
+                case 'c':
+                        if (optarg) {
+                                r = parse_boolean(optarg);
+                                if (r < 0)
+                                        return log_error_errno(r, "Failed to parse --cgroup-id= value: %s", optarg);
+                        } else
+                                r = true;
+
+                        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("CGroup %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 ? RUNTIME_SCOPE_USER : RUNTIME_SCOPE_SYSTEM,
+                                                        &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);