core: make sure we generate a nicer error when a linked unit is attempted to be enabled

We don't allow using config symlinks to enable units, but the error message we
printed was awful. Fix that, and generate a more readable error.

Fixes #3010.

diff --git a/src/libelogind/sd-bus/bus-common-errors.c b/src/libelogind/sd-bus/bus-common-errors.c
index f16878cd1a6c2fa0e69055588a6f975d33c236d8..02e3bf904c8623b1853990ac7761415eb29c4491 100644 (file)
--- a/src/libelogind/sd-bus/bus-common-errors.c
+++ b/src/libelogind/sd-bus/bus-common-errors.c
@@ -39,6 +39,7 @@ BUS_ERROR_MAP_ELF_REGISTER const sd_bus_error_map bus_common_errors[] = {
         SD_BUS_ERROR_MAP(BUS_ERROR_TRANSACTION_IS_DESTRUCTIVE,   EDEADLK),
         SD_BUS_ERROR_MAP(BUS_ERROR_UNIT_MASKED,                  ESHUTDOWN),
         SD_BUS_ERROR_MAP(BUS_ERROR_UNIT_GENERATED,               EADDRNOTAVAIL),
+        SD_BUS_ERROR_MAP(BUS_ERROR_UNIT_LINKED,                  ELOOP),
         SD_BUS_ERROR_MAP(BUS_ERROR_JOB_TYPE_NOT_APPLICABLE,      EBADR),
         SD_BUS_ERROR_MAP(BUS_ERROR_NO_ISOLATION,                 EPERM),
         SD_BUS_ERROR_MAP(BUS_ERROR_SHUTTING_DOWN,                ECANCELED),