chiark / gitweb /
Revert "socket: add support for TCP fast Open"
[elogind.git] / src / cgls / cgls.c
index a05f979..7070503 100644 (file)
 #include "pager.h"
 #include "build.h"
 #include "output-mode.h"
+#include "fileio.h"
+#include "sd-bus.h"
+#include "bus-util.h"
+#include "bus-error.h"
+#include "unit-name.h"
 
 static bool arg_no_pager = false;
 static bool arg_kernel_threads = false;
 static bool arg_all = false;
 static int arg_full = -1;
+static char* arg_machine = NULL;
 
 static void help(void) {
-
         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"
-               "  --full              Do not ellipsize output\n"
-               "  -k                  Include kernel threads in output\n",
-               program_invocation_short_name);
+               "  -l --full           Do not ellipsize output\n"
+               "  -k                  Include kernel threads in output\n"
+               "  -M --machine        Show container\n"
+               , program_invocation_short_name);
 }
 
 static int parse_argv(int argc, char *argv[]) {
@@ -58,7 +64,6 @@ static int parse_argv(int argc, char *argv[]) {
         enum {
                 ARG_NO_PAGER = 0x100,
                 ARG_VERSION,
-                ARG_FULL,
         };
 
         static const struct option options[] = {
@@ -66,8 +71,9 @@ static int parse_argv(int argc, char *argv[]) {
                 { "version",   no_argument,       NULL, ARG_VERSION  },
                 { "no-pager",  no_argument,       NULL, ARG_NO_PAGER },
                 { "all",       no_argument,       NULL, 'a'          },
-                { "full",      no_argument,       NULL, ARG_FULL     },
-                { NULL,        0,                 NULL, 0            }
+                { "full",      no_argument,       NULL, 'l'          },
+                { "machine",   required_argument, NULL, 'M'          },
+                {}
         };
 
         int c;
@@ -75,7 +81,7 @@ static int parse_argv(int argc, char *argv[]) {
         assert(argc >= 1);
         assert(argv);
 
-        while ((c = getopt_long(argc, argv, "hka", options, NULL)) >= 0) {
+        while ((c = getopt_long(argc, argv, "hkalM:", options, NULL)) >= 0)
 
                 switch (c) {
 
@@ -96,7 +102,7 @@ static int parse_argv(int argc, char *argv[]) {
                         arg_all = true;
                         break;
 
-                case ARG_FULL:
+                case 'l':
                         arg_full = true;
                         break;
 
@@ -104,14 +110,16 @@ static int parse_argv(int argc, char *argv[]) {
                         arg_kernel_threads = true;
                         break;
 
+                case 'M':
+                        arg_machine = optarg;
+                        break;
+
                 case '?':
                         return -EINVAL;
 
                 default:
-                        log_error("Unknown option code %c", c);
-                        return -EINVAL;
+                        assert_not_reached("Unhandled option");
                 }
-        }
 
         return 1;
 }
@@ -119,6 +127,8 @@ static int parse_argv(int argc, char *argv[]) {
 int main(int argc, char *argv[]) {
         int r = 0, retval = EXIT_FAILURE;
         int output_flags;
+        _cleanup_free_ char *root = NULL;
+        _cleanup_bus_close_unref_ sd_bus *bus = NULL;
 
         log_parse_environment();
         log_open();
@@ -132,7 +142,7 @@ int main(int argc, char *argv[]) {
         }
 
         if (!arg_no_pager) {
-                r = pager_open();
+                r = pager_open(false);
                 if (r > 0) {
                         if (arg_full == -1)
                                 arg_full = true;
@@ -143,21 +153,36 @@ int main(int argc, char *argv[]) {
                 arg_all * OUTPUT_SHOW_ALL |
                 (arg_full > 0) * OUTPUT_FULL_WIDTH;
 
+        r = bus_open_transport(BUS_TRANSPORT_LOCAL, NULL, false, &bus);
+        if (r < 0) {
+                log_error("Failed to create bus connection: %s", strerror(-r));
+                goto finish;
+        }
+
         if (optind < argc) {
-                unsigned i;
+                int i;
 
-                for (i = (unsigned) optind; i < (unsigned) argc; i++) {
+                for (i = optind; i < argc; i++) {
                         int q;
-                        printf("%s:\n", argv[i]);
 
-                        q = show_cgroup_by_path(argv[i], NULL, 0,
+                        fprintf(stdout, "%s:\n", argv[i]);
+                        fflush(stdout);
+
+                        if (arg_machine)
+                                root = strjoin("machine/", arg_machine, "/", argv[i], NULL);
+                        else
+                                root = strdup(argv[i]);
+                        if (!root)
+                                return log_oom();
+
+                        q = show_cgroup_by_path(root, NULL, 0,
                                                 arg_kernel_threads, output_flags);
                         if (q < 0)
                                 r = q;
                 }
 
         } else {
-                char _cleanup_free_ *p;
+                _cleanup_free_ char *p;
 
                 p = get_current_dir_name();
                 if (!p) {
@@ -165,33 +190,77 @@ int main(int argc, char *argv[]) {
                         goto finish;
                 }
 
-                if (path_startswith(p, "/sys/fs/cgroup")) {
+                if (path_startswith(p, "/sys/fs/cgroup") && !arg_machine) {
                         printf("Working Directory %s:\n", p);
                         r = show_cgroup_by_path(p, NULL, 0,
                                                 arg_kernel_threads, output_flags);
                 } else {
-                        char _cleanup_free_ *root = NULL;
-                        const char *t = NULL;
-
-                        r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, 1, &root);
-                        if (r < 0)
-                                t = "/";
-                        else {
-                                if (endswith(root, "/system"))
-                                        root[strlen(root)-7] = 0;
-
-                                t = root[0] ? root : "/";
+                        if (arg_machine) {
+                                char *m;
+                                const char *cgroup;
+                                _cleanup_free_ char *scope = NULL;
+                                _cleanup_free_ char *path = NULL;
+                                _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
+                                _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
+
+                                m = strappenda("/run/systemd/machines/", arg_machine);
+                                r = parse_env_file(m, NEWLINE, "SCOPE", &scope, NULL);
+                                if (r < 0) {
+                                        log_error("Failed to get machine path: %s", strerror(-r));
+                                        goto finish;
+                                }
+
+                                path = unit_dbus_path_from_name(scope);
+                                if (!path) {
+                                        log_oom();
+                                        goto finish;
+                                }
+
+                                r = sd_bus_get_property(
+                                                bus,
+                                                "org.freedesktop.systemd1",
+                                                path,
+                                                "org.freedesktop.systemd1.Scope",
+                                                "ControlGroup",
+                                                &error,
+                                                &reply,
+                                                "s");
+
+                                if (r < 0) {
+                                        log_error("Failed to query ControlGroup: %s", bus_error_message(&error, -r));
+                                        goto finish;
+                                }
+
+                                r = sd_bus_message_read(reply, "s", &cgroup);
+                                if (r < 0) {
+                                        bus_log_parse_error(r);
+                                        goto finish;
+                                }
+
+                                root = strdup(cgroup);
+                                if (!root) {
+                                        log_oom();
+                                        goto finish;
+                                }
+
+                        } else
+                                r = cg_get_root_path(&root);
+                        if (r < 0) {
+                                log_error("Failed to get %s path: %s",
+                                          arg_machine ? "machine" : "root", strerror(-r));
+                                goto finish;
                         }
 
-                        r = show_cgroup(SYSTEMD_CGROUP_CONTROLLER, t, NULL, 0,
+                        r = show_cgroup(SYSTEMD_CGROUP_CONTROLLER, root, NULL, 0,
                                         arg_kernel_threads, output_flags);
                 }
         }
 
-        if (r < 0)
-                log_error("Failed to list cgroup tree: %s", strerror(-r));
-
-        retval = EXIT_SUCCESS;
+        if (r < 0) {
+                log_error("Failed to list cgroup tree %s: %s", root, strerror(-r));
+                retval = EXIT_FAILURE;
+        } else
+                retval = EXIT_SUCCESS;
 
 finish:
         pager_close();