samba-tool domain provision: Remove experimental OpenLDAP support

This feature has long been obsolete, remaining only in the hope
that it might be revived in the future.

Specifically, in 2011 the S4 OpenLDAP backend HOWTO was removed:

 commit 1d46325af8
 Author: Andrew Bartlett <abartlet@samba.org>
 Date:   Wed Apr 27 22:42:29 2011 +1000

     Remove outdated S4 OpenLDAP backend HOWTO.

There is a project to revive this, hosted here:

https://github.com/Symas/samba
and
https://github.com/Symas/samba_overlays

However discussions at SambaXP with Nadezhda Ivanova
indicate a new approach with slapd being started by Samba
and taught to read native Samba ldb files is more likely
in the short term.

This has the advantage that Samba's provision and offline
tooling would not need to change, with the solution looking
more like how BIND9_DLZ has access to the Samba DB.

If any of this is required then reverting these patches will be
the least of the difficulties in bringing this to production.

Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Nadezhda Ivanova <nivanova@symas.com>

python/samba/provision/__init__.py

@@ -77,9 +77,7 @@ from samba.ms_display_specifiers import read_ms_ldif
 from samba.ntacls import setntacl, getntacl, dsacl2fsacl
 from samba.ndr import ndr_pack, ndr_unpack
 from samba.provision.backend import (
-    FDSBackend,
     LDBBackend,
-    OpenLDAPBackend,
 )
 from samba.descriptor import (
     get_empty_descriptor,
@@ -2162,13 +2160,11 @@ def provision(logger, session_info, smbconf=None,
               krbtgtpass=None, domainguid=None, policyguid=None, policyguid_dc=None,
               dns_backend=None, dns_forwarder=None, dnspass=None,
               invocationid=None, machinepass=None, ntdsguid=None,
-              root=None, nobody=None, users=None, backup=None, aci=None,
-              serverrole=None, dom_for_fun_level=None, backend_type=None,
-              sitename=None, ol_mmr_urls=None, ol_olc=None, slapd_path=None,
+              root=None, nobody=None, users=None, backup=None,
+              sitename=None, serverrole=None, dom_for_fun_level=None,
               useeadb=False, am_rodc=False, lp=None, use_ntvfs=False,
               use_rfc2307=False, maxuid=None, maxgid=None, skip_sysvolacl=True,
-              ldap_backend_forced_uri=None, nosync=False, ldap_dryrun_mode=False,
-              ldap_backend_extra_port=None, base_schema="2012_R2",
+              base_schema="2012_R2",
               plaintext_secrets=False, backend_store=None,
               backend_store_size=None, batch_mode=False):
     """Provision samba4
@@ -2185,8 +2181,6 @@ def provision(logger, session_info, smbconf=None,
         # Make a new, random password between Samba and it's LDAP server
         ldapadminpass = samba.generate_random_password(128, 255)
 
-    if backend_type is None:
-        backend_type = "ldb"
     if backend_store is None:
         backend_store = get_default_backend_store()
 
@@ -2288,28 +2282,9 @@ def provision(logger, session_info, smbconf=None,
     schema = Schema(domainsid, invocationid=invocationid,
                     schemadn=names.schemadn, base_schema=base_schema)
 
-    if backend_type == "ldb":
-        provision_backend = LDBBackend(backend_type, paths=paths,
-                                       lp=lp,
-                                       names=names, logger=logger)
-    elif backend_type == "fedora-ds":
-        provision_backend = FDSBackend(backend_type, paths=paths,
-                                       lp=lp,
-                                       names=names, logger=logger, domainsid=domainsid,
-                                       schema=schema, hostname=hostname, ldapadminpass=ldapadminpass,
-                                       slapd_path=slapd_path,
-                                       root=root)
-    elif backend_type == "openldap":
-        provision_backend = OpenLDAPBackend(backend_type, paths=paths,
-                                            lp=lp,
-                                            names=names, logger=logger, domainsid=domainsid,
-                                            schema=schema, hostname=hostname, ldapadminpass=ldapadminpass,
-                                            slapd_path=slapd_path, ol_mmr_urls=ol_mmr_urls,
-                                            ldap_backend_extra_port=ldap_backend_extra_port,
-                                            ldap_dryrun_mode=ldap_dryrun_mode, nosync=nosync,
-                                            ldap_backend_forced_uri=ldap_backend_forced_uri)
-    else:
-        raise ValueError("Unknown LDAP backend type selected")
+    provision_backend = LDBBackend(paths=paths,
+                                   lp=lp,
+                                   names=names, logger=logger)
 
     provision_backend.init()
     provision_backend.start()
@@ -2480,8 +2455,7 @@ def provision_become_dc(smbconf=None, targetdir=None,
                         adminpass=None, krbtgtpass=None, domainguid=None, policyguid=None,
                         policyguid_dc=None, invocationid=None, machinepass=None, dnspass=None,
                         dns_backend=None, root=None, nobody=None, users=None,
-                        backup=None, serverrole=None, ldap_backend=None,
-                        ldap_backend_type=None, sitename=None, debuglevel=1, use_ntvfs=False):
+                        backup=None, serverrole=None, sitename=None, debuglevel=1, use_ntvfs=False):
 
     logger = logging.getLogger("provision")
     samba.set_debug_level(debuglevel)