systemctl: show main and control PID explicitly in cgroup-show

In some cases the main/control PID of a service can be outside of the
services cgroups (for example, if logind readjusts the processes'
cgroup). In order to clarify this for the user show the main/control PID
in the cgroup tree nonetheless, but mark them specially.

3 files changed, 56 insertions, 16 deletions

diff --git a/src/login/loginctl.c b/src/login/loginctl.c
index f1cb16e713..3ec8057d3b 100644
--- a/src/login/loginctl.c
+++ b/src/login/loginctl.c
@@ -352,7 +352,7 @@ typedef struct SessionStatusInfo {
         uid_t uid;
         const char *name;
         usec_t timestamp;
-        const char *control_group;
+        const char *default_control_group;
         int vtnr;
         const char *seat;
         const char *tty;
@@ -371,7 +371,7 @@ typedef struct UserStatusInfo {
         uid_t uid;
         const char *name;
         usec_t timestamp;
-        const char *control_group;
+        const char *default_control_group;
         const char *state;
         char **sessions;
         const char *display;
@@ -461,10 +461,10 @@ static void print_session_status_info(SessionStatusInfo *i) {
 
         printf("\t  Active: %s\n", yes_no(i->active));
 
-        if (i->control_group) {
+        if (i->default_control_group) {
                 unsigned c;
 
-                printf("\t  CGroup: %s\n", i->control_group);
+                printf("\t  CGroup: %s\n", i->default_control_group);
 
                 if (arg_transport != TRANSPORT_SSH) {
                         c = columns();
@@ -473,7 +473,7 @@ static void print_session_status_info(SessionStatusInfo *i) {
                         else
                                 c = 0;
 
-                        show_cgroup_by_path(i->control_group, "\t\t  ", c, false, arg_all);
+                        show_cgroup_and_extra_by_spec(i->default_control_group, "\t\t  ", c, false, arg_all, &i->leader, i->leader > 0 ? 1 : 0);
                 }
         }
 }
@@ -513,10 +513,10 @@ static void print_user_status_info(UserStatusInfo *i) {
                 printf("\n");
         }
 
-        if (i->control_group) {
+        if (i->default_control_group) {
                 unsigned c;
 
-                printf("\t  CGroup: %s\n", i->control_group);
+                printf("\t  CGroup: %s\n", i->default_control_group);
 
                 if (arg_transport != TRANSPORT_SSH) {
                         c = columns();
@@ -525,7 +525,7 @@ static void print_user_status_info(UserStatusInfo *i) {
                         else
                                 c = 0;
 
-                        show_cgroup_by_path(i->control_group, "\t\t  ", c, false, arg_all);
+                        show_cgroup_by_path(i->default_control_group, "\t\t  ", c, false, arg_all);
                 }
         }
 }
@@ -581,8 +581,8 @@ static int status_property_session(const char *name, DBusMessageIter *iter, Sess
                                 i->id = s;
                         else if (streq(name, "Name"))
                                 i->name = s;
-                        else if (streq(name, "ControlGroupPath"))
-                                i->control_group = s;
+                        else if (streq(name, "DefaultControlGroup"))
+                                i->default_control_group = s;
                         else if (streq(name, "TTY"))
                                 i->tty = s;
                         else if (streq(name, "Display"))
@@ -680,8 +680,8 @@ static int status_property_user(const char *name, DBusMessageIter *iter, UserSta
                 if (!isempty(s)) {
                         if (streq(name, "Name"))
                                 i->name = s;
-                        else if (streq(name, "ControlGroupPath"))
-                                i->control_group = s;
+                        else if (streq(name, "DefaultControlGroup"))
+                                i->default_control_group = s;
                         else if (streq(name, "State"))
                                 i->state = s;
                 }
diff --git a/src/login/logind-session-dbus.c b/src/login/logind-session-dbus.c
index 0780f3f42a..7f1b58072d 100644
--- a/src/login/logind-session-dbus.c
+++ b/src/login/logind-session-dbus.c
@@ -45,7 +45,7 @@
         "  <property name=\"Name\" type=\"s\" access=\"read\"/>\n"      \
         "  <property name=\"Timestamp\" type=\"t\" access=\"read\"/>\n" \
         "  <property name=\"TimestampMonotonic\" type=\"t\" access=\"read\"/>\n" \
-        "  <property name=\"ControlGroupPath\" type=\"s\" access=\"read\"/>\n" \
+        "  <property name=\"DefaultControlGroup\" type=\"s\" access=\"read\"/>\n" \
         "  <property name=\"VTNr\" type=\"u\" access=\"read\"/>\n"      \
         "  <property name=\"Seat\" type=\"(so)\" access=\"read\"/>\n"   \
         "  <property name=\"TTY\" type=\"s\" access=\"read\"/>\n"       \
@@ -196,6 +196,26 @@ static int bus_session_append_idle_hint_since(DBusMessageIter *i, const char *pr
         return 0;
 }
 
+static int bus_session_append_default_cgroup(DBusMessageIter *i, const char *property, void *data) {
+        Session *s = data;
+        char *t;
+        int r;
+        bool success;
+
+        assert(i);
+        assert(property);
+        assert(s);
+
+        r = cg_join_spec(SYSTEMD_CGROUP_CONTROLLER, s->cgroup_path, &t);
+        if (r < 0)
+                return r;
+
+        success = dbus_message_iter_append_basic(i, DBUS_TYPE_STRING, &t);
+        free(t);
+
+        return success ? 0 : -ENOMEM;
+}
+
 static DEFINE_BUS_PROPERTY_APPEND_ENUM(bus_session_append_type, session_type, SessionType);
 static DEFINE_BUS_PROPERTY_APPEND_ENUM(bus_session_append_class, session_class, SessionClass);
 
@@ -228,7 +248,7 @@ static const BusProperty bus_login_session_properties[] = {
         { "Id",                     bus_property_append_string,         "s", offsetof(Session, id),                 true },
         { "Timestamp",              bus_property_append_usec,           "t", offsetof(Session, timestamp.realtime)  },
         { "TimestampMonotonic",     bus_property_append_usec,           "t", offsetof(Session, timestamp.monotonic) },
-        { "ControlGroupPath",       bus_property_append_string,         "s", offsetof(Session, cgroup_path),        true },
+        { "DefaultControlGroup",    bus_session_append_default_cgroup,  "s", 0,                                     },
         { "VTNr",                   bus_property_append_uint32,         "u", offsetof(Session, vtnr)                },
         { "Seat",                   bus_session_append_seat,         "(so)", 0 },
         { "TTY",                    bus_property_append_string,         "s", offsetof(Session, tty),                true },
diff --git a/src/login/logind-user-dbus.c b/src/login/logind-user-dbus.c
index 2d3375a09c..21b608d526 100644
--- a/src/login/logind-user-dbus.c
+++ b/src/login/logind-user-dbus.c
@@ -38,7 +38,7 @@
         "  <property name=\"Timestamp\" type=\"t\" access=\"read\"/>\n" \
         "  <property name=\"TimestampMonotonic\" type=\"t\" access=\"read\"/>\n" \
         "  <property name=\"RuntimePath\" type=\"s\" access=\"read\"/>\n" \
-        "  <property name=\"ControlGroupPath\" type=\"s\" access=\"read\"/>\n" \
+        "  <property name=\"DefaultControlGroup\" type=\"s\" access=\"read\"/>\n" \
         "  <property name=\"Service\" type=\"s\" access=\"read\"/>\n"   \
         "  <property name=\"Display\" type=\"(so)\" access=\"read\"/>\n" \
         "  <property name=\"State\" type=\"s\" access=\"read\"/>\n"     \
@@ -189,6 +189,26 @@ static int bus_user_append_idle_hint_since(DBusMessageIter *i, const char *prope
         return 0;
 }
 
+static bus_user_append_default_cgroup(DBusMessageIter *i, const char *property, void *data) {
+        User *u = data;
+        char *t;
+        int r;
+        bool success;
+
+        assert(i);
+        assert(property);
+        assert(u);
+
+        r = cg_join_spec(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, &t);
+        if (r < 0)
+                return r;
+
+        success = dbus_message_iter_append_basic(i, DBUS_TYPE_STRING, &t);
+        free(t);
+
+        return success ? 0 : -ENOMEM;
+}
+
 static int get_user_for_path(Manager *m, const char *path, User **_u) {
         User *u;
         unsigned long lu;
@@ -220,7 +240,7 @@ static const BusProperty bus_login_user_properties[] = {
         { "Timestamp",              bus_property_append_usec,        "t", offsetof(User, timestamp.realtime)  },
         { "TimestampMonotonic",     bus_property_append_usec,        "t", offsetof(User, timestamp.monotonic) },
         { "RuntimePath",            bus_property_append_string,      "s", offsetof(User, runtime_path),       true },
-        { "ControlGroupPath",       bus_property_append_string,      "s", offsetof(User, cgroup_path),        true },
+        { "DefaultControlGroup",    bus_user_append_default_cgroup,  "s", 0 },
         { "Service",                bus_property_append_string,      "s", offsetof(User, service),            true },
         { "Display",                bus_user_append_display,      "(so)", 0 },
         { "State",                  bus_user_append_state,           "s", 0 },