sd-bus: do not assert if bus description is not set

The code has an explicit fallback using runtime_scope_to_string(), which
is also documented in the man page. So -ENXIO should only be returned when
the fallback doesn't work, i.e. bus->runtime_scope == -EINVAL.

Fixup for f4b2933ee7890e5d414ab266d8586f19027a2bd9.

This should fix the following errors during boot:
May 18 16:05:37 fedora systemd-update-utmp[263]: Assertion 'bus->description' failed at src/libsystemd/sd-bus/sd-bus.c:4201, function sd_bus_get_description(). Ignoring.
May 18 16:05:38 fedora systemctl[360]: Assertion 'bus->description' failed at src/libsystemd/sd-bus/sd-bus.c:4201, function sd_bus_get_description(). Ignoring.
May 18 16:05:38 fedora systemctl[363]: Assertion 'bus->description' failed at src/libsystemd/sd-bus/sd-bus.c:4201, function sd_bus_get_description(). Ignoring.
May 18 16:05:38 fedora systemd-update-utmp[372]: Assertion 'bus->description' failed at src/libsystemd/sd-bus/sd-bus.c:4201, function sd_bus_get_description(). Ignoring.
May 18 16:05:38 fedora @ystemctl[387]: Assertion 'bus->description' failed at src/libsystemd/sd-bus/sd-bus.c:4201, function sd_bus_get_description(). Ignoring.
May 18 16:05:40 fedora systemd-update-utmp[477]: Assertion 'bus->description' failed at src/libsystemd/sd-bus/sd-bus.c:4201, function sd_bus_get_description(). Ignoring.
May 18 16:05:41 fedora systemd-homed[509]: Assertion 'bus->description' failed at src/libsystemd/sd-bus/sd-bus.c:4201, function sd_bus_get_description(). Ignoring.
May 18 16:05:41 fedora systemd-logind[510]: Assertion 'bus->description' failed at src/libsystemd/sd-bus/sd-bus.c:4201, function sd_bus_get_description(). Ignoring.
May 18 16:05:41 fedora systemd-update-utmp[529]: Assertion 'bus->description' failed at src/libsystemd/sd-bus/sd-bus.c:4201, function sd_bus_get_description(). Ignoring.
May 18 16:05:42 fedora systemd-user-runtime-dir[531]: Assertion 'bus->description' failed at src/libsystemd/sd-bus/sd-bus.c:4201, function sd_bus_get_description(). Ignoring.
May 18 16:05:42 fedora systemctl[542]: Assertion 'bus->description' failed at src/libsystemd/sd-bus/sd-bus.c:4201, function sd_bus_get_description(). Ignoring.
May 18 16:05:42 fedora systemd-hostnamed[556]: Assertion 'bus->description' failed at src/libsystemd/sd-bus/sd-bus.c:4201, function sd_bus_get_description(). Ignoring.

diff --git a/src/libsystemd/sd-bus/sd-bus.c b/src/libsystemd/sd-bus/sd-bus.c
index 6e0b88e9d731c8813861a067bfec34baa224bc72..f9a195d2edcb0a01ad3f7763a8014cb806ab6cb6 100644 (file)
--- a/src/libsystemd/sd-bus/sd-bus.c
+++ b/src/libsystemd/sd-bus/sd-bus.c
@@ -4198,14 +4198,15 @@ _public_ int sd_bus_get_description(sd_bus *bus, const char **description) {
         assert_return(bus, -EINVAL);
         assert_return(bus = bus_resolve(bus), -ENOPKG);
         assert_return(description, -EINVAL);
-        assert_return(bus->description, -ENXIO);
         assert_return(!bus_origin_changed(bus), -ECHILD);
 
-        if (bus->description)
-                *description = bus->description;
-        else
-                *description = runtime_scope_to_string(bus->runtime_scope);
+        const char *d = bus->description;
+        if (!d)
+                d = runtime_scope_to_string(bus->runtime_scope);
+        if (!d)
+                return -ENXIO;
 
+        *description = d;
         return 0;
 }