chiark / gitweb /
Prep v230: Apply missing upstream fixes and updates (6/8) src/login.
[elogind.git] / src / login / loginctl.c
index 2a2c71f8f0ad35a2ad7ee91849b19e6ff70b65b0..ee9816ad07628020b9d1b6d3140735f0ccbab91b 100644 (file)
@@ -1,5 +1,3 @@
-/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
-
 /***
   This file is part of systemd.
 
   along with systemd; If not, see <http://www.gnu.org/licenses/>.
 ***/
 
-#include <unistd.h>
 #include <errno.h>
-#include <string.h>
 #include <getopt.h>
 #include <locale.h>
+#include <string.h>
+#include <unistd.h>
 
 #include "sd-bus.h"
-#include "sd-login.h"
-#include "bus-util.h"
+
+#include "alloc-util.h"
 #include "bus-error.h"
+#include "bus-util.h"
+//#include "cgroup-show.h"
+#include "cgroup-util.h"
 #include "log.h"
-#include "util.h"
+//#include "logs-show.h"
 #include "macro.h"
 #include "pager.h"
-#include "build.h"
+#include "parse-util.h"
+#include "process-util.h"
+#include "signal-util.h"
+#include "spawn-polkit-agent.h"
 #include "strv.h"
-#include "unit-name.h"
 #include "sysfs-show.h"
-// #include "logs-show.h"
-#include "cgroup-show.h"
-#include "cgroup-util.h"
-#include "spawn-polkit-agent.h"
-#include "verbs.h"
-#include "process-util.h"
 #include "terminal-util.h"
-#include "signal-util.h"
+#include "unit-name.h"
+#include "user-util.h"
+#include "util.h"
+#include "verbs.h"
+
+/// Additional includes for elogind
+#include "logind-action.h"
+#include "musl_missing.h"
+#include "sd-login.h"
+#include "virt.h"
 
 static char **arg_property = NULL;
 static bool arg_all = false;
+static bool arg_value = false;
 static bool arg_full = false;
 static bool arg_no_pager = false;
+static bool arg_no_wall = false;
 static bool arg_legend = true;
 static const char *arg_kill_who = NULL;
 static int arg_signal = SIGTERM;
 static BusTransport arg_transport = BUS_TRANSPORT_LOCAL;
 static char *arg_host = NULL;
+static usec_t arg_when = 0;
+static char **arg_wall = NULL;
 static bool arg_ask_password = true;
-#if 0
+static bool arg_ignore_inhibitors = false;
+#if 0 /// UNNEEDED by elogind
 static unsigned arg_lines = 10;
 static OutputMode arg_output = OUTPUT_SHORT;
 #endif // 0
+static enum action {
+        _ACTION_INVALID,
+        ACTION_HALT,
+        ACTION_POWEROFF,
+        ACTION_REBOOT,
+        ACTION_KEXEC,
+        ACTION_SUSPEND,
+        ACTION_HIBERNATE,
+        ACTION_HYBRID_SLEEP,
+        ACTION_CANCEL_SHUTDOWN,
+        _ACTION_MAX
+} arg_action;
 
-static void pager_open_if_enabled(void) {
-
-        if (arg_no_pager)
-                return;
-
-        pager_open(false);
-}
 
 static void polkit_agent_open_if_enabled(void) {
 
@@ -82,18 +98,20 @@ static void polkit_agent_open_if_enabled(void) {
         polkit_agent_open();
 }
 
+#if 0 /// UNNEEDED by elogind
 static OutputFlags get_output_flags(void) {
 
         return
                 arg_all * OUTPUT_SHOW_ALL |
                 arg_full * OUTPUT_FULL_WIDTH |
                 (!on_tty() || pager_have()) * OUTPUT_FULL_WIDTH |
-                on_tty() * OUTPUT_COLOR;
+                colors_enabled() * OUTPUT_COLOR;
 }
+#endif // 0
 
 static int list_sessions(int argc, char *argv[], void *userdata) {
-        _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
-        _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
+        _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
+        _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
         const char *id, *user, *seat, *object;
         sd_bus *bus = userdata;
         unsigned k = 0;
@@ -103,7 +121,7 @@ static int list_sessions(int argc, char *argv[], void *userdata) {
         assert(bus);
         assert(argv);
 
-        pager_open_if_enabled();
+        pager_open(arg_no_pager, false);
 
         r = sd_bus_call_method(
                         bus,
@@ -139,8 +157,8 @@ static int list_sessions(int argc, char *argv[], void *userdata) {
 }
 
 static int list_users(int argc, char *argv[], void *userdata) {
-        _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
-        _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
+        _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
+        _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
         const char *user, *object;
         sd_bus *bus = userdata;
         unsigned k = 0;
@@ -150,7 +168,7 @@ static int list_users(int argc, char *argv[], void *userdata) {
         assert(bus);
         assert(argv);
 
-        pager_open_if_enabled();
+        pager_open(arg_no_pager, false);
 
         r = sd_bus_call_method(
                         bus,
@@ -186,8 +204,8 @@ static int list_users(int argc, char *argv[], void *userdata) {
 }
 
 static int list_seats(int argc, char *argv[], void *userdata) {
-        _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
-        _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
+        _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
+        _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
         const char *seat, *object;
         sd_bus *bus = userdata;
         unsigned k = 0;
@@ -196,7 +214,7 @@ static int list_seats(int argc, char *argv[], void *userdata) {
         assert(bus);
         assert(argv);
 
-        pager_open_if_enabled();
+        pager_open(arg_no_pager, false);
 
         r = sd_bus_call_method(
                         bus,
@@ -231,23 +249,21 @@ static int list_seats(int argc, char *argv[], void *userdata) {
         return 0;
 }
 
+#if 0 /// UNNEEDED by elogind
 static int show_unit_cgroup(sd_bus *bus, const char *interface, const char *unit, pid_t leader) {
-        _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
-        _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
+        _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
+        _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
         _cleanup_free_ char *path = NULL;
         const char *cgroup;
-        int r;
         unsigned c;
+        int r;
 
         assert(bus);
         assert(unit);
 
-        if (arg_transport != BUS_TRANSPORT_LOCAL)
-                return 0;
-
         path = unit_dbus_path_from_name(unit);
         if (!path)
-                return -ENOMEM;
+                return log_oom();
 
         r = sd_bus_get_property(
                         bus,
@@ -255,29 +271,43 @@ static int show_unit_cgroup(sd_bus *bus, const char *interface, const char *unit
                         path,
                         interface,
                         "ControlGroup",
-                        &error, &reply, "s");
+                        &error,
+                        &reply,
+                        "s");
         if (r < 0)
-                return r;
+                return log_error_errno(r, "Failed to query ControlGroup: %s", bus_error_message(&error, r));
 
         r = sd_bus_message_read(reply, "s", &cgroup);
         if (r < 0)
-                return r;
+                return bus_log_parse_error(r);
 
         if (isempty(cgroup))
                 return 0;
 
-        if (cg_is_empty_recursive(ELOGIND_CGROUP_CONTROLLER, cgroup, false) != 0 && leader <= 0)
-                return 0;
-
         c = columns();
         if (c > 18)
                 c -= 18;
         else
                 c = 0;
 
-        show_cgroup_and_extra(ELOGIND_CGROUP_CONTROLLER, cgroup, "\t\t  ", c, false, &leader, leader > 0, get_output_flags());
+        r = unit_show_processes(bus, unit, cgroup, "\t\t  ", c, get_output_flags(), &error);
+        if (r == -EBADR) {
+
+                if (arg_transport == BUS_TRANSPORT_REMOTE)
+                        return 0;
+
+                /* Fallback for older systemd versions where the GetUnitProcesses() call is not yet available */
+
+                if (cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER, cgroup) != 0 && leader <= 0)
+                        return 0;
+
+                show_cgroup_and_extra(SYSTEMD_CGROUP_CONTROLLER, cgroup, "\t\t  ", c, &leader, leader > 0, get_output_flags());
+        } else if (r < 0)
+                return log_error_errno(r, "Failed to dump process list: %s", bus_error_message(&error, r));
+
         return 0;
 }
+#endif // 0
 
 typedef struct SessionStatusInfo {
         char *id;
@@ -302,6 +332,7 @@ typedef struct SessionStatusInfo {
 
 typedef struct UserStatusInfo {
         uid_t uid;
+        bool linger;
         char *name;
         struct dual_timestamp timestamp;
         char *state;
@@ -375,11 +406,9 @@ static int prop_map_first_of_struct(sd_bus *bus, const char *member, sd_bus_mess
                 if (r < 0)
                         return r;
 
-                free(*p);
-                *p = strdup(s);
-
-                if (!*p)
-                        return -ENOMEM;
+                r = free_and_strdup(p, s);
+                if (r < 0)
+                        return r;
         } else {
                 r = sd_bus_message_read_basic(m, contents[0], userdata);
                 if (r < 0)
@@ -536,8 +565,9 @@ static int print_session_status_info(sd_bus *bus, const char *path, bool *new_li
 
         if (i.scope) {
                 printf("\t    Unit: %s\n", i.scope);
+#if 0 /// UNNEEDED by elogind
                 show_unit_cgroup(bus, "org.freedesktop.systemd1.Scope", i.scope, i.leader);
-#if 0
+
                 if (arg_transport == BUS_TRANSPORT_LOCAL) {
 
                         show_journal_by_unit(
@@ -553,7 +583,6 @@ static int print_session_status_info(sd_bus *bus, const char *path, bool *new_li
                                         true,
                                         NULL);
                 }
-
 #endif // 0
         }
 
@@ -564,6 +593,7 @@ static int print_user_status_info(sd_bus *bus, const char *path, bool *new_line)
 
         static const struct bus_properties_map map[]  = {
                 { "Name",               "s",     NULL,                     offsetof(UserStatusInfo, name)                },
+                { "Linger",             "b",     NULL,                     offsetof(UserStatusInfo, linger)              },
                 { "Slice",              "s",     NULL,                     offsetof(UserStatusInfo, slice)               },
                 { "State",              "s",     NULL,                     offsetof(UserStatusInfo, state)               },
                 { "UID",                "u",     NULL,                     offsetof(UserStatusInfo, uid)                 },
@@ -608,20 +638,21 @@ static int print_user_status_info(sd_bus *bus, const char *path, bool *new_line)
                 char **l;
                 printf("\tSessions:");
 
-                STRV_FOREACH(l, i.sessions) {
-                        if (streq_ptr(*l, i.display))
-                                printf(" *%s", *l);
-                        else
-                                printf(" %s", *l);
-                }
+                STRV_FOREACH(l, i.sessions)
+                        printf(" %s%s",
+                               streq_ptr(*l, i.display) ? "*" : "",
+                               *l);
 
                 printf("\n");
         }
 
+        printf("\t  Linger: %s\n", yes_no(i.linger));
+
         if (i.slice) {
                 printf("\t    Unit: %s\n", i.slice);
+#if 0 /// UNNEEDED by elogind
                 show_unit_cgroup(bus, "org.freedesktop.systemd1.Slice", i.slice, 0);
-#if 0
+
                 show_journal_by_unit(
                                 stdout,
                                 i.slice,
@@ -634,7 +665,6 @@ static int print_user_status_info(sd_bus *bus, const char *path, bool *new_line)
                                 SD_JOURNAL_LOCAL_ONLY,
                                 true,
                                 NULL);
-
 #endif // 0
         }
 
@@ -695,19 +725,174 @@ static int print_seat_status_info(sd_bus *bus, const char *path, bool *new_line)
         return 0;
 }
 
+#define property(name, fmt, ...)                                        \
+        do {                                                            \
+                if (arg_value)                                          \
+                        printf(fmt "\n", __VA_ARGS__);                  \
+                else                                                    \
+                        printf("%s=" fmt "\n", name, __VA_ARGS__);      \
+        } while(0)
+
+static int print_property(const char *name, sd_bus_message *m, const char *contents) {
+        int r;
+
+        assert(name);
+        assert(m);
+        assert(contents);
+
+        if (arg_property && !strv_find(arg_property, name))
+                /* skip what we didn't read */
+                return sd_bus_message_skip(m, contents);
+
+        switch (contents[0]) {
+
+        case SD_BUS_TYPE_STRUCT_BEGIN:
+
+                if (contents[1] == SD_BUS_TYPE_STRING && STR_IN_SET(name, "Display", "Seat", "ActiveSession")) {
+                        const char *s;
+
+                        r = sd_bus_message_read(m, "(so)", &s, NULL);
+                        if (r < 0)
+                                return bus_log_parse_error(r);
+
+                        if (arg_all || !isempty(s))
+                                property(name, "%s", s);
+
+                        return 0;
+
+                } else if (contents[1] == SD_BUS_TYPE_UINT32 && streq(name, "User")) {
+                        uint32_t uid;
+
+                        r = sd_bus_message_read(m, "(uo)", &uid, NULL);
+                        if (r < 0)
+                                return bus_log_parse_error(r);
+
+                        if (!uid_is_valid(uid)) {
+                                log_error("Invalid user ID: " UID_FMT, uid);
+                                return -EINVAL;
+                        }
+
+                        property(name, UID_FMT, uid);
+                        return 0;
+                }
+
+                break;
+
+        case SD_BUS_TYPE_ARRAY:
+
+                if (contents[1] == SD_BUS_TYPE_STRUCT_BEGIN && streq(name, "Sessions")) {
+                        const char *s;
+                        bool space = false;
+
+                        r = sd_bus_message_enter_container(m, SD_BUS_TYPE_ARRAY, "(so)");
+                        if (r < 0)
+                                return bus_log_parse_error(r);
+
+                        if (!arg_value)
+                                printf("%s=", name);
+
+                        while ((r = sd_bus_message_read(m, "(so)", &s, NULL)) > 0) {
+                                printf("%s%s", space ? " " : "", s);
+                                space = true;
+                        }
+
+                        if (space || !arg_value)
+                                printf("\n");
+
+                        if (r < 0)
+                                return bus_log_parse_error(r);
+
+                        r = sd_bus_message_exit_container(m);
+                        if (r < 0)
+                                return bus_log_parse_error(r);
+
+                        return 0;
+                }
+
+                break;
+        }
+
+        r = bus_print_property(name, m, arg_value, arg_all);
+        if (r < 0)
+                return bus_log_parse_error(r);
+
+        if (r == 0) {
+                r = sd_bus_message_skip(m, contents);
+                if (r < 0)
+                        return bus_log_parse_error(r);
+
+                if (arg_all)
+                        printf("%s=[unprintable]\n", name);
+        }
+
+        return 0;
+}
+
 static int show_properties(sd_bus *bus, const char *path, bool *new_line) {
+        _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
+        _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
         int r;
 
+        assert(bus);
+        assert(path);
+        assert(new_line);
+
+        r = sd_bus_call_method(
+                        bus,
+                        "org.freedesktop.login1",
+                        path,
+                        "org.freedesktop.DBus.Properties",
+                        "GetAll",
+                        &error,
+                        &reply,
+                        "s", "");
+        if (r < 0)
+                return log_error_errno(r, "Failed to get properties: %s", bus_error_message(&error, r));
+
+        r = sd_bus_message_enter_container(reply, SD_BUS_TYPE_ARRAY, "{sv}");
+        if (r < 0)
+                return bus_log_parse_error(r);
+
         if (*new_line)
                 printf("\n");
 
         *new_line = true;
 
-        r = bus_print_all_properties(bus, "org.freedesktop.login1", path, arg_property, arg_all);
+        while ((r = sd_bus_message_enter_container(reply, SD_BUS_TYPE_DICT_ENTRY, "sv")) > 0) {
+                const char *name, *contents;
+
+                r = sd_bus_message_read(reply, "s", &name);
+                if (r < 0)
+                        return bus_log_parse_error(r);
+
+                r = sd_bus_message_peek_type(reply, NULL, &contents);
+                if (r < 0)
+                        return bus_log_parse_error(r);
+
+                r = sd_bus_message_enter_container(reply, SD_BUS_TYPE_VARIANT, contents);
+                if (r < 0)
+                        return bus_log_parse_error(r);
+
+                r = print_property(name, reply, contents);
+                if (r < 0)
+                        return r;
+
+                r = sd_bus_message_exit_container(reply);
+                if (r < 0)
+                        return bus_log_parse_error(r);
+
+                r = sd_bus_message_exit_container(reply);
+                if (r < 0)
+                        return bus_log_parse_error(r);
+        }
         if (r < 0)
-                log_error_errno(r, "Could not get properties: %m");
+                return bus_log_parse_error(r);
 
-        return r;
+        r = sd_bus_message_exit_container(reply);
+        if (r < 0)
+                return bus_log_parse_error(r);
+
+        return 0;
 }
 
 static int show_session(int argc, char *argv[], void *userdata) {
@@ -720,7 +905,7 @@ static int show_session(int argc, char *argv[], void *userdata) {
 
         properties = !strstr(argv[0], "status");
 
-        pager_open_if_enabled();
+        pager_open(arg_no_pager, false);
 
         if (argc <= 1) {
                 /* If not argument is specified inspect the manager
@@ -733,8 +918,8 @@ static int show_session(int argc, char *argv[], void *userdata) {
         }
 
         for (i = 1; i < argc; i++) {
-                _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
-                _cleanup_bus_message_unref_ sd_bus_message * reply = NULL;
+                _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
+                _cleanup_(sd_bus_message_unrefp) sd_bus_message * reply = NULL;
                 const char *path = NULL;
 
                 r = sd_bus_call_method(
@@ -776,7 +961,7 @@ static int show_user(int argc, char *argv[], void *userdata) {
 
         properties = !strstr(argv[0], "status");
 
-        pager_open_if_enabled();
+        pager_open(arg_no_pager, false);
 
         if (argc <= 1) {
                 /* If not argument is specified inspect the manager
@@ -788,8 +973,8 @@ static int show_user(int argc, char *argv[], void *userdata) {
         }
 
         for (i = 1; i < argc; i++) {
-                _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
-                _cleanup_bus_message_unref_ sd_bus_message * reply = NULL;
+                _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
+                _cleanup_(sd_bus_message_unrefp) sd_bus_message * reply = NULL;
                 const char *path = NULL;
                 uid_t uid;
 
@@ -836,7 +1021,7 @@ static int show_seat(int argc, char *argv[], void *userdata) {
 
         properties = !strstr(argv[0], "status");
 
-        pager_open_if_enabled();
+        pager_open(arg_no_pager, false);
 
         if (argc <= 1) {
                 /* If not argument is specified inspect the manager
@@ -848,8 +1033,8 @@ static int show_seat(int argc, char *argv[], void *userdata) {
         }
 
         for (i = 1; i < argc; i++) {
-                _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
-                _cleanup_bus_message_unref_ sd_bus_message * reply = NULL;
+                _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
+                _cleanup_(sd_bus_message_unrefp) sd_bus_message * reply = NULL;
                 const char *path = NULL;
 
                 r = sd_bus_call_method(
@@ -882,7 +1067,7 @@ static int show_seat(int argc, char *argv[], void *userdata) {
 }
 
 static int activate(int argc, char *argv[], void *userdata) {
-        _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
+        _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
         sd_bus *bus = userdata;
         char *short_argv[3];
         int r, i;
@@ -928,7 +1113,7 @@ static int activate(int argc, char *argv[], void *userdata) {
 }
 
 static int kill_session(int argc, char *argv[], void *userdata) {
-        _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
+        _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
         sd_bus *bus = userdata;
         int r, i;
 
@@ -960,7 +1145,7 @@ static int kill_session(int argc, char *argv[], void *userdata) {
 }
 
 static int enable_linger(int argc, char *argv[], void *userdata) {
-        _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
+        _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
         sd_bus *bus = userdata;
         char* short_argv[3];
         bool b;
@@ -1010,7 +1195,7 @@ static int enable_linger(int argc, char *argv[], void *userdata) {
 }
 
 static int terminate_user(int argc, char *argv[], void *userdata) {
-        _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
+        _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
         sd_bus *bus = userdata;
         int r, i;
 
@@ -1044,7 +1229,7 @@ static int terminate_user(int argc, char *argv[], void *userdata) {
 }
 
 static int kill_user(int argc, char *argv[], void *userdata) {
-        _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
+        _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
         sd_bus *bus = userdata;
         int r, i;
 
@@ -1081,7 +1266,7 @@ static int kill_user(int argc, char *argv[], void *userdata) {
 }
 
 static int attach(int argc, char *argv[], void *userdata) {
-        _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
+        _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
         sd_bus *bus = userdata;
         int r, i;
 
@@ -1111,7 +1296,7 @@ static int attach(int argc, char *argv[], void *userdata) {
 }
 
 static int flush_devices(int argc, char *argv[], void *userdata) {
-        _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
+        _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
         sd_bus *bus = userdata;
         int r;
 
@@ -1135,7 +1320,7 @@ static int flush_devices(int argc, char *argv[], void *userdata) {
 }
 
 static int lock_sessions(int argc, char *argv[], void *userdata) {
-        _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
+        _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
         sd_bus *bus = userdata;
         int r;
 
@@ -1159,7 +1344,7 @@ static int lock_sessions(int argc, char *argv[], void *userdata) {
 }
 
 static int terminate_seat(int argc, char *argv[], void *userdata) {
-        _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
+        _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
         sd_bus *bus = userdata;
         int r, i;
 
@@ -1187,8 +1372,177 @@ static int terminate_seat(int argc, char *argv[], void *userdata) {
         return 0;
 }
 
-static int check_inhibitors(sd_bus *bus, const char *verb, const char *inhibit_what) {
-        _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
+static int logind_set_wall_message(sd_bus* bus, const char* msg) {
+        _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
+        _cleanup_free_ char *m = NULL;
+        int r;
+
+        if (strv_extend(&arg_wall, msg) < 0)
+                return log_oom();
+
+        m = strv_join(arg_wall, " ");
+        if (!m)
+                return log_oom();
+
+        r = sd_bus_call_method(
+                        bus,
+                        "org.freedesktop.login1",
+                        "/org/freedesktop/login1",
+                        "org.freedesktop.login1.Manager",
+                        "SetWallMessage",
+                        &error,
+                        NULL,
+                        "sb",
+                        m,
+                        !arg_no_wall);
+
+        if (r < 0)
+                return log_warning_errno(r, "Failed to set wall message, ignoring: %s", bus_error_message(&error, r));
+
+        return 0;
+}
+
+/* Ask elogind, which might grant access to unprivileged users
+ * through PolicyKit */
+static int elogind_reboot(sd_bus *bus, enum action a) {
+        _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
+        const char *method;
+        int r;
+        static const char *table[_ACTION_MAX] = {
+                [ACTION_REBOOT]          = "The system is going down for reboot NOW!",
+                [ACTION_POWEROFF]        = "The system is going down for power-off NOW!",
+                [ACTION_CANCEL_SHUTDOWN] = "The system shutdown has been cancelled NOW!"
+        };
+
+        if (!bus)
+                return -EIO;
+
+        polkit_agent_open_if_enabled();
+
+        switch (a) {
+
+        case ACTION_POWEROFF:
+                method = "PowerOff";
+                break;
+
+        case ACTION_REBOOT:
+                method = "Reboot";
+                break;
+
+        case ACTION_SUSPEND:
+                method = "Suspend";
+                break;
+
+        case ACTION_HIBERNATE:
+                method = "Hibernate";
+                break;
+
+        case ACTION_HYBRID_SLEEP:
+                method = "HybridSleep";
+                break;
+
+        case ACTION_CANCEL_SHUTDOWN:
+                method = "CancelScheduledShutdown";
+                break;
+
+        default:
+                return -EINVAL;
+        }
+
+        r = logind_set_wall_message(bus, table[a]);
+        if (r < 0) {
+                log_warning_errno(r, "Failed to set wall message, ignoring: %s",
+                                  bus_error_message(&error, r));
+                sd_bus_error_free(&error);
+        }
+
+        r = sd_bus_call_method(
+                        bus,
+                        "org.freedesktop.login1",
+                        "/org/freedesktop/login1",
+                        "org.freedesktop.login1.Manager",
+                        method,
+                        &error,
+                        NULL,
+                        "b", arg_ask_password);
+        if (r < 0)
+                log_error("Failed to execute operation: %s", bus_error_message(&error, r));
+
+        return r;
+}
+
+static const struct {
+        HandleAction action;
+        const char*  verb;
+} action_table[_ACTION_MAX] = {
+        [ACTION_POWEROFF]     = { HANDLE_POWEROFF,     "poweroff",    },
+        [ACTION_REBOOT]       = { HANDLE_REBOOT,       "reboot",      },
+        [ACTION_SUSPEND]      = { HANDLE_SUSPEND,      "suspend",     },
+        [ACTION_HIBERNATE]    = { HANDLE_HIBERNATE,    "hibernate",   },
+        [ACTION_HYBRID_SLEEP] = { HANDLE_HYBRID_SLEEP, "hybrid-sleep" },
+};
+
+static enum action verb_to_action(const char *verb) {
+        enum action i;
+
+        for (i = _ACTION_INVALID; i < _ACTION_MAX; i++)
+                if (streq_ptr(action_table[i].verb, verb))
+                        return i;
+
+        return _ACTION_INVALID;
+}
+
+static int parse_shutdown_time_spec(const char *t, usec_t *_u) {
+        assert(t);
+        assert(_u);
+
+        if (streq(t, "now"))
+                *_u = 0;
+        else if (!strchr(t, ':')) {
+                uint64_t u;
+
+                if (safe_atou64(t, &u) < 0)
+                        return -EINVAL;
+
+                *_u = now(CLOCK_REALTIME) + USEC_PER_MINUTE * u;
+        } else {
+                char *e = NULL;
+                long hour, minute;
+                struct tm tm = {};
+                time_t s;
+                usec_t n;
+
+                errno = 0;
+                hour = strtol(t, &e, 10);
+                if (errno > 0 || *e != ':' || hour < 0 || hour > 23)
+                        return -EINVAL;
+
+                minute = strtol(e+1, &e, 10);
+                if (errno > 0 || *e != 0 || minute < 0 || minute > 59)
+                        return -EINVAL;
+
+                n = now(CLOCK_REALTIME);
+                s = (time_t) (n / USEC_PER_SEC);
+
+                assert_se(localtime_r(&s, &tm));
+
+                tm.tm_hour = (int) hour;
+                tm.tm_min = (int) minute;
+                tm.tm_sec = 0;
+
+                assert_se(s = mktime(&tm));
+
+                *_u = (usec_t) s * USEC_PER_SEC;
+
+                while (*_u <= n)
+                        *_u += USEC_PER_DAY;
+        }
+
+        return 0;
+}
+
+static int check_inhibitors(sd_bus* bus, enum action a) {
+        _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
         _cleanup_strv_free_ char **sessions = NULL;
         const char *what, *who, *why, *mode;
         uint32_t uid, pid;
@@ -1196,7 +1550,11 @@ static int check_inhibitors(sd_bus *bus, const char *verb, const char *inhibit_w
         char **s;
         int r;
 
-        assert(bus);
+        if (arg_ignore_inhibitors)
+                return 0;
+
+        if (arg_when > 0)
+                return 0;
 
         if (geteuid() == 0)
                 return 0;
@@ -1232,14 +1590,22 @@ static int check_inhibitors(sd_bus *bus, const char *verb, const char *inhibit_w
                 if (!sv)
                         return log_oom();
 
-                if (!strv_contains(sv, inhibit_what))
+                if ((pid_t) pid < 0)
+                        return log_error_errno(ERANGE, "Bad PID %"PRIu32": %m", pid);
+
+                if (!strv_contains(sv,
+                                   IN_SET(a,
+                                          ACTION_HALT,
+                                          ACTION_POWEROFF,
+                                          ACTION_REBOOT,
+                                          ACTION_KEXEC) ? "shutdown" : "sleep"))
                         continue;
 
                 get_process_comm(pid, &comm);
                 user = uid_to_name(uid);
 
                 log_warning("Operation inhibited by \"%s\" (PID "PID_FMT" \"%s\", user %s), reason is \"%s\".",
-                            who, pid, strna(comm), strna(user), why);
+                            who, (pid_t) pid, strna(comm), strna(user), why);
 
                 c++;
         }
@@ -1276,154 +1642,49 @@ static int check_inhibitors(sd_bus *bus, const char *verb, const char *inhibit_w
         if (c <= 0)
                 return 0;
 
-        log_error("Please retry operation after closing inhibitors and logging out other users.\nAlternatively, ignore inhibitors and users with 'loginctl %s -i'.", verb);
+        log_error("Please retry operation after closing inhibitors and logging out other users.\nAlternatively, ignore inhibitors and users with 'systemctl %s -i'.",
+                  action_table[a].verb);
 
         return -EPERM;
 }
 
-static int poweroff(int argc, char *argv[], void *userdata) {
-        _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
-        _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
-        sd_bus *bus = userdata;
-        int r;
-
-        assert(bus);
-
-        r = check_inhibitors(bus, "poweroff", "shutdown");
-        if (r < 0)
-                return r;
-
-        polkit_agent_open_if_enabled();
-
-        r = sd_bus_call_method(
-                        bus,
-                        "org.freedesktop.login1",
-                        "/org/freedesktop/login1",
-                        "org.freedesktop.login1.Manager",
-                        "PowerOff",
-                        &error,
-                        NULL,
-                        "b", arg_ask_password);
-        if (r < 0)
-                log_error("Failed to power off: %s", bus_error_message(&error, r));
-
-        return r;
-}
-
-static int reboot(int argc, char *argv[], void *userdata) {
-        _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
-        _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
+static int start_special(int argc, char *argv[], void *userdata) {
         sd_bus *bus = userdata;
+        enum action a;
         int r;
 
-        assert(bus);
-
-        r = check_inhibitors(bus, "reboot", "shutdown");
-        if (r < 0)
-                return r;
-
-        polkit_agent_open_if_enabled();
-
-        r = sd_bus_call_method(
-                        bus,
-                        "org.freedesktop.login1",
-                        "/org/freedesktop/login1",
-                        "org.freedesktop.login1.Manager",
-                        "Reboot",
-                        &error,
-                        NULL,
-                        "b", arg_ask_password);
-        if (r < 0)
-                log_error("Failed to reboot: %s", bus_error_message(&error, r));
-
-        return r;
-}
-
-static int suspend(int argc, char *argv[], void *userdata) {
-        _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
-        _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
-        sd_bus *bus = userdata;
-        int r;
-
-        assert(bus);
-
-        r = check_inhibitors(bus, "suspend", "sleep");
-        if (r < 0)
-                return r;
-
-        polkit_agent_open_if_enabled();
-
-        r = sd_bus_call_method(
-                        bus,
-                        "org.freedesktop.login1",
-                        "/org/freedesktop/login1",
-                        "org.freedesktop.login1.Manager",
-                        "Suspend",
-                        &error,
-                        NULL,
-                        "b", arg_ask_password);
-        if (r < 0)
-                log_error("Failed to suspend: %s", bus_error_message(&error, r));
-
-        return r;
-}
-
-static int hibernate(int argc, char *argv[], void *userdata) {
-        _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
-        _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
-        sd_bus *bus = userdata;
-        int r;
-
-        assert(bus);
-
-        r = check_inhibitors(bus, "hibernate", "sleep");
-        if (r < 0)
-                return r;
-
-        polkit_agent_open_if_enabled();
-
-        r = sd_bus_call_method(
-                        bus,
-                        "org.freedesktop.login1",
-                        "/org/freedesktop/login1",
-                        "org.freedesktop.login1.Manager",
-                        "Hibernate",
-                        &error,
-                        NULL,
-                        "b", arg_ask_password);
-        if (r < 0)
-                log_error("Failed to hibernate: %s", bus_error_message(&error, r));
-
-        return r;
-}
-
-static int hybrid_sleep(int argc, char *argv[], void *userdata) {
-        _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
-        _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
-        sd_bus *bus = userdata;
-        int r;
+        assert(argv);
 
-        assert(bus);
+        a = verb_to_action(argv[0]);
 
-        r = check_inhibitors(bus, "hybrid-sleep", "sleep");
+        r = check_inhibitors(bus, a);
         if (r < 0)
                 return r;
 
-        polkit_agent_open_if_enabled();
-
-        r = sd_bus_call_method(
-                        bus,
-                        "org.freedesktop.login1",
-                        "/org/freedesktop/login1",
-                        "org.freedesktop.login1.Manager",
-                        "HybridSleep",
-                        &error,
-                        NULL,
-                        "b", arg_ask_password);
-        if (r < 0)
-                log_error("Failed to hybrid sleep: %s", bus_error_message(&error, r));
+        /* Now power off actions in chroot environments */
+        if ((a == ACTION_POWEROFF ||
+             a == ACTION_REBOOT) &&
+            (running_in_chroot() > 0) ) {
+                log_info("Running in chroot, ignoring request.");
+                return 0;
+        }
 
-        return r;
+        /* Switch to cancel shutdown, if a shutdown action was requested,
+           and the option to cancel it was set: */
+        if ((a == ACTION_POWEROFF ||
+             a == ACTION_REBOOT) &&
+            (arg_action == ACTION_CANCEL_SHUTDOWN))
+                return elogind_reboot(bus, arg_action);
+
+        /* Otherwise perform requested action */
+        if (a == ACTION_POWEROFF ||
+            a == ACTION_REBOOT ||
+            a == ACTION_SUSPEND ||
+            a == ACTION_HIBERNATE ||
+            a == ACTION_HYBRID_SLEEP)
+                return elogind_reboot(bus, a);
+
+        return -EOPNOTSUPP;
 }
 
 static int help(int argc, char *argv[], void *userdata) {
@@ -1433,20 +1694,24 @@ static int help(int argc, char *argv[], void *userdata) {
                "  -h --help                Show this help\n"
                "     --version             Show package version\n"
                "     --no-pager            Do not pipe output into a pager\n"
+               "     --no-wall             Do not print any wall message\n"
                "     --no-legend           Do not show the headers and footers\n"
                "     --no-ask-password     Don't prompt for password\n"
                "  -H --host=[USER@]HOST    Operate on remote host\n"
                "  -M --machine=CONTAINER   Operate on local container\n"
                "  -p --property=NAME       Show only properties by this name\n"
                "  -a --all                 Show all properties, including empty ones\n"
+               "     --value               When showing properties, only print the value\n"
                "  -l --full                Do not ellipsize output\n"
                "     --kill-who=WHO        Who to send signal to\n"
                "  -s --signal=SIGNAL       Which signal to send\n"
-#if 0
+#if 0 /// UNNEEDED by elogind
                "  -n --lines=INTEGER       Number of journal entries to show\n"
                "  -o --output=STRING       Change journal output mode (short, short-monotonic,\n"
                "                           verbose, export, json, json-pretty, json-sse, cat)\n\n"
 #endif // 0
+               "  -c                       Cancel a pending shutdown\n"
+               "  -i --ignore-inhibitors   When shutting down or sleeping, ignore inhibitors\n"
                "Session Commands:\n"
                "  list-sessions            List sessions\n"
                "  session-status [ID...]   Show session status\n"
@@ -1488,7 +1753,9 @@ static int parse_argv(int argc, char *argv[]) {
 
         enum {
                 ARG_VERSION = 0x100,
+                ARG_VALUE,
                 ARG_NO_PAGER,
+                ARG_NO_WALL,
                 ARG_NO_LEGEND,
                 ARG_KILL_WHO,
                 ARG_NO_ASK_PASSWORD,
@@ -1499,27 +1766,31 @@ static int parse_argv(int argc, char *argv[]) {
                 { "version",         no_argument,       NULL, ARG_VERSION         },
                 { "property",        required_argument, NULL, 'p'                 },
                 { "all",             no_argument,       NULL, 'a'                 },
+                { "value",           no_argument,       NULL, ARG_VALUE           },
                 { "full",            no_argument,       NULL, 'l'                 },
                 { "no-pager",        no_argument,       NULL, ARG_NO_PAGER        },
+                { "no-wall",         no_argument,       NULL, ARG_NO_WALL         },
                 { "no-legend",       no_argument,       NULL, ARG_NO_LEGEND       },
                 { "kill-who",        required_argument, NULL, ARG_KILL_WHO        },
                 { "signal",          required_argument, NULL, 's'                 },
                 { "host",            required_argument, NULL, 'H'                 },
                 { "machine",         required_argument, NULL, 'M'                 },
                 { "no-ask-password", no_argument,       NULL, ARG_NO_ASK_PASSWORD },
-#if 0
+#if 0 /// UNNEEDED by elogind
                 { "lines",           required_argument, NULL, 'n'                 },
                 { "output",          required_argument, NULL, 'o'                 },
-#endif //
+#endif // 0
+                { "ignore-inhibitors", no_argument,     NULL, 'i'                 },
                 {}
         };
 
+        char **wall = NULL;
         int c, r;
 
         assert(argc >= 0);
         assert(argv);
 
-        while ((c = getopt_long(argc, argv, "hp:als:H:M:", options, NULL)) >= 0)
+        while ((c = getopt_long(argc, argv, "hp:als:H:M:n:o:ci", options, NULL)) >= 0)
 
                 switch (c) {
 
@@ -1528,9 +1799,7 @@ static int parse_argv(int argc, char *argv[]) {
                         return 0;
 
                 case ARG_VERSION:
-                        puts(PACKAGE_STRING);
-                        puts(SYSTEMD_FEATURES);
-                        return 0;
+                        return version();
 
                 case 'p': {
                         r = strv_extend(&arg_property, optarg);
@@ -1548,10 +1817,15 @@ static int parse_argv(int argc, char *argv[]) {
                         arg_all = true;
                         break;
 
+                case ARG_VALUE:
+                        arg_value = true;
+                        break;
+
                 case 'l':
                         arg_full = true;
                         break;
-#if 0
+
+#if 0 /// UNNEEDED by elogind
                 case 'n':
                         if (safe_atou(optarg, &arg_lines) < 0) {
                                 log_error("Failed to parse lines '%s'", optarg);
@@ -1567,10 +1841,15 @@ static int parse_argv(int argc, char *argv[]) {
                         }
                         break;
 #endif // 0
+
                 case ARG_NO_PAGER:
                         arg_no_pager = true;
                         break;
 
+                case ARG_NO_WALL:
+                        arg_no_wall = true;
+                        break;
+
                 case ARG_NO_LEGEND:
                         arg_legend = false;
                         break;
@@ -1601,6 +1880,14 @@ static int parse_argv(int argc, char *argv[]) {
                         arg_host = optarg;
                         break;
 
+                case 'c':
+                        arg_action = ACTION_CANCEL_SHUTDOWN;
+                        break;
+
+                case 'i':
+                        arg_ignore_inhibitors = true;
+                        break;
+
                 case '?':
                         return -EINVAL;
 
@@ -1608,6 +1895,30 @@ static int parse_argv(int argc, char *argv[]) {
                         assert_not_reached("Unhandled option");
                 }
 
+        if (argc > optind && arg_action != ACTION_CANCEL_SHUTDOWN) {
+                r = parse_shutdown_time_spec(argv[optind], &arg_when);
+                if (r < 0) {
+                        log_error("Failed to parse time specification: %s", argv[optind]);
+                        return r;
+                }
+        } else
+                arg_when = now(CLOCK_REALTIME) + USEC_PER_MINUTE;
+
+        if (argc > optind && arg_action == ACTION_CANCEL_SHUTDOWN)
+                /* No time argument for shutdown cancel */
+                wall = argv + optind;
+        else if (argc > optind + 1)
+                /* We skip the time argument */
+                wall = argv + optind + 1;
+
+        if (wall) {
+                arg_wall = strv_copy(wall);
+                if (!arg_wall)
+                        return log_oom();
+        }
+
+        optind = argc;
+
         return 1;
 }
 
@@ -1638,11 +1949,12 @@ static int loginctl_main(int argc, char *argv[], sd_bus *bus) {
                 { "attach",            3,        VERB_ANY, 0,            attach            },
                 { "flush-devices",     VERB_ANY, 1,        0,            flush_devices     },
                 { "terminate-seat",    2,        VERB_ANY, 0,            terminate_seat    },
-                { "poweroff",          VERB_ANY, 1,        0,            poweroff          },
-                { "reboot",            VERB_ANY, 1,        0,            reboot            },
-                { "suspend",           VERB_ANY, 1,        0,            suspend           },
-                { "hibernate",         VERB_ANY, 1,        0,            hibernate         },
-                { "hybrid-sleep",      VERB_ANY, 1,        0,            hybrid_sleep      },
+                { "poweroff",          VERB_ANY, 1,        0,            start_special     },
+                { "reboot",            VERB_ANY, 1,        0,            start_special     },
+                { "suspend",           VERB_ANY, 1,        0,            start_special     },
+                { "hibernate",         VERB_ANY, 1,        0,            start_special     },
+                { "hybrid-sleep",      VERB_ANY, 1,        0,            start_special     },
+                { "cancel-shutdown",   VERB_ANY, 1,        0,            start_special     },
                 {}
         };
 
@@ -1650,10 +1962,11 @@ static int loginctl_main(int argc, char *argv[], sd_bus *bus) {
 }
 
 int main(int argc, char *argv[]) {
-        _cleanup_bus_flush_close_unref_ sd_bus *bus = NULL;
+        _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
         int r;
 
         setlocale(LC_ALL, "");
+        elogind_set_program_name(argv[0]);
         log_parse_environment();
         log_open();
 
@@ -1661,7 +1974,7 @@ int main(int argc, char *argv[]) {
         if (r <= 0)
                 goto finish;
 
-        r = bus_open_transport(arg_transport, arg_host, false, &bus);
+        r = bus_connect_transport(arg_transport, arg_host, false, &bus);
         if (r < 0) {
                 log_error_errno(r, "Failed to create bus connection: %m");
                 goto finish;
@@ -1676,6 +1989,7 @@ finish:
         polkit_agent_close();
 
         strv_free(arg_property);
+        strv_free(arg_wall);
 
         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
 }