manager: identify the init/system/user mode we are running it and pick D-Bus bus accordingly

3 files changed, 32 insertions, 3 deletions

diff --git a/dbus.c b/dbus.c
index 0088b2c337..bfec0f9782 100644
--- a/dbus.c
+++ b/dbus.c
@@ -378,7 +378,7 @@ int bus_init(Manager *m) {
         dbus_connection_set_change_sigpipe(FALSE);
 
         dbus_error_init(&error);
-        if (!(m->bus = dbus_bus_get_private(m->is_init ? DBUS_BUS_SYSTEM : DBUS_BUS_SESSION, &error))) {
+        if (!(m->bus = dbus_bus_get_private(m->running_as == MANAGER_USER ? DBUS_BUS_SESSION : DBUS_BUS_SYSTEM, &error))) {
                 log_error("Failed to get D-Bus connection: %s", error.message);
                 dbus_error_free(&error);
                 return -ECONNREFUSED;
diff --git a/manager.c b/manager.c
index ace480c4dd..25bc752882 100644
--- a/manager.c
+++ b/manager.c
@@ -76,6 +76,15 @@ Manager* manager_new(void) {
         if (!(m = new0(Manager, 1)))
                 return NULL;
 
+        if (getpid() == 1)
+                m->running_as = MANAGER_INIT;
+        else if (getuid() == 0)
+                m->running_as = MANAGER_SYSTEM;
+        else
+                m->running_as = MANAGER_USER;
+
+        log_debug("systemd running in %s mode.", manager_running_as_to_string(m->running_as));
+
         m->signal_watch.fd = m->mount_watch.fd = m->udev_watch.fd = m->epoll_fd = -1;
         m->current_job_id = 1; /* start as id #1, so that we can leave #0 around as "null-like" value */
 
@@ -1347,3 +1356,11 @@ int manager_get_job_from_dbus_path(Manager *m, const char *s, Job **_j) {
 
         return 0;
 }
+
+static const char* const manager_running_as_table[_MANAGER_RUNNING_AS_MAX] = {
+        [MANAGER_INIT] = "init",
+        [MANAGER_SYSTEM] = "system",
+        [MANAGER_USER] = "user"
+};
+
+DEFINE_STRING_TABLE_LOOKUP(manager_running_as, ManagerRunningAs);
diff --git a/manager.h b/manager.h
index b92680d96c..45fb0944b9 100644
--- a/manager.h
+++ b/manager.h
@@ -32,6 +32,14 @@ typedef struct Manager Manager;
 typedef enum WatchType WatchType;
 typedef struct Watch Watch;
 
+typedef enum ManagerRunningAs {
+        MANAGER_INIT,      /* root and pid=1 */
+        MANAGER_SYSTEM,    /* root and pid!=1 */
+        MANAGER_USER,      /* non-root */
+        _MANAGER_RUNNING_AS_MAX,
+        _MANAGER_RUNNING_AS_INVALID = -1
+} ManagerRunningAs;
+
 enum WatchType {
         WATCH_INVALID,
         WATCH_SIGNAL,
@@ -69,6 +77,9 @@ struct Watch {
 #define SPECIAL_CTRL_ALT_DEL_TARGET "ctrl-alt-del.target"
 
 struct Manager {
+        /* In which mode are we running */
+        ManagerRunningAs running_as;
+
         uint32_t current_job_id;
 
         /* Note that the set of units we know of is allowed to be
@@ -104,8 +115,6 @@ struct Manager {
         bool dispatching_run_queue:1;
         bool dispatching_dbus_queue:1;
 
-        bool is_init:1;
-
         bool request_bus_dispatch:1;
 
         Hashmap *watch_pids;  /* pid => Unit object n:1 */
@@ -155,4 +164,7 @@ unsigned manager_dispatch_dbus_queue(Manager *m);
 
 int manager_loop(Manager *m);
 
+const char *manager_running_as_to_string(ManagerRunningAs i);
+ManagerRunningAs manager_running_as_from_string(const char *s);
+
 #endif