unit: handle nicely of certain unit types are not supported on specific systems

[elogind.git] / src / core / busname.c

diff --git a/src/core/busname.c b/src/core/busname.c
index d4aa463397ea58de428fc4623d1646e2df8e9bc2..838171fe2366db6894a98685e5e9faf928549489 100644 (file)
--- a/src/core/busname.c
+++ b/src/core/busname.c
@@ -971,6 +971,16 @@ static int busname_get_timeout(Unit *u, uint64_t *timeout) {
         return 1;
 }
 
+static bool busname_supported(Manager *m) {
+        int supported = -1;
+        assert(m);
+
+        if (supported < 0)
+                supported = access("/sys/fs/kdbus", F_OK) >= 0;
+
+        return supported;
+}
+
 static const char* const busname_state_table[_BUSNAME_STATE_MAX] = {
         [BUSNAME_DEAD] = "dead",
         [BUSNAME_MAKING] = "making",
@@ -1032,6 +1042,8 @@ const UnitVTable busname_vtable = {
 
         .reset_failed = busname_reset_failed,
 
+        .supported = busname_supported,
+
         .bus_interface = "org.freedesktop.systemd1.BusName",
         .bus_vtable = bus_busname_vtable,