nss: Turn __nss_database_lookup into a compatibility symbol

The function uses the internal service_user type, so it is not
really usable from the outside of glibc.  Rename the function
to __nss_database_lookup2 for internal use, and change
__nss_database_lookup to always indicate failure to the caller.

__nss_next already was a compatibility symbol.  The new
implementation always fails and no longer calls __nss_next2.

unscd, the alternative nscd implementation, does not use
__nss_database_lookup, so it is not affected by this change.

1 files changed, 5 insertions, 3 deletions

diff --git a/nss/Versions b/nss/Versions
index db8c887720..afc82a23c2 100644
--- a/nss/Versions
+++ b/nss/Versions
@@ -1,8 +1,10 @@
 libc {
   GLIBC_2.0 {
-     # functions used in other libraries
+    __nss_configure_lookup;
+
+    # Functions exported as no-op compat symbols.
     __nss_passwd_lookup; __nss_group_lookup; __nss_hosts_lookup; __nss_next;
-    __nss_database_lookup; __nss_configure_lookup;
+    __nss_database_lookup;
   }
   GLIBC_2.2.2 {
     __nss_hostname_digits_dots;
@@ -15,7 +17,7 @@ libc {
 
     __nss_passwd_lookup2; __nss_group_lookup2; __nss_hosts_lookup2;
     __nss_services_lookup2; __nss_next2; __nss_lookup;
-    __nss_hash;
+    __nss_hash; __nss_database_lookup2;
   }
 }