Copy, fix and document export2odbc command from mod_admin_extra.erl

doc/guide.tex

@@ -5145,6 +5145,8 @@ The most interesting ones are:
   from other Jabber/XMPP servers
   There exist tutorials to
   \footahref{http://www.ejabberd.im/migrate-to-ejabberd}{migrate from other software to ejabberd}.
+\titem{export2odbc virtualhost directory} \ind{export mnesia data to SQL files}
+  Export virtual host information from Mnesia tables to SQL files.
 \titem{delete\_expired\_messages} This option can be used to delete old messages
   in offline storage. This might be useful when the number of offline messages
   is very high.

src/ejabberd_admin.erl

@@ -41,6 +41,7 @@
 	 %% Purge DB
 	 delete_expired_messages/0, delete_old_messages/1,
 	 %% Mnesia
+	 export2odbc/2,
 	 set_master/1,
 	 backup_mnesia/1, restore_mnesia/1,
 	 dump_mnesia/1, dump_table/2, load_mnesia/1,
@@ -165,6 +166,11 @@ commands() ->
 			module = mod_pubsub, function = rename_default_nodeplugin,
 			args = [], result = {res, rescode}},
 
+     #ejabberd_commands{name = export2odbc, tags = [mnesia],
+			desc = "Export virtual host information from Mnesia tables to SQL files",
+			module = ?MODULE, function = export2odbc,
+			args = [{host, string}, {directory, string}],
+			result = {res, rescode}},
      #ejabberd_commands{name = set_master, tags = [mnesia],
 			desc = "Set master node of the clustered Mnesia tables",
 			longdesc = "If you provide as nodename \"self\", this "
@@ -388,6 +394,23 @@ delete_old_messages(Days) ->
 %%% Mnesia management
 %%%
 
+export2odbc(Host, Directory) ->
+    Tables = [{export_last, last},
+              {export_offline, offline},
+              {export_private_storage, private_storage},
+              {export_roster, roster},
+              {export_vcard, vcard},
+              {export_vcard_search, vcard_search},
+              {export_passwd, passwd}],
+    Export = fun({TableFun, Table}) ->
+                     Filename = filename:join([Directory, atom_to_list(Table)++".txt"]),
+                     io:format("Trying to export Mnesia table '~p' on Host '~s' to file '~s'~n", [Table, Host, Filename]),
+                     Res = (catch ejd2odbc:TableFun(Host, Filename)),
+                     io:format("  Result: ~p~n", [Res])
+             end,
+    lists:foreach(Export, Tables),
+    ok.
+
 set_master("self") ->
     set_master(node());
 set_master(NodeString) when is_list(NodeString) ->

src/ejd2odbc.erl

@@ -92,7 +92,13 @@
 export_passwd(Server, Output) ->
     export_common(
       Server, passwd, Output,
-      fun(Host, {passwd, {LUser, LServer}, Password} = _R)
+      fun(Host, {passwd, {LUser, LServer}, {scram, _, _, _, _}} = _R) ->
+	      ?INFO_MSG("You are trying to export the authentication "
+	                "information of the account ~s@~s, but his password "
+	                "is stored as SCRAM, and ejabberd ODBC authentication "
+	                "doesn't support SCRAM.", [LUser, LServer]),
+	      [];
+         (Host, {passwd, {LUser, LServer}, Password} = _R)
 	 when LServer == Host ->
 	      Username = ejabberd_odbc:escape(LUser),
 	      Pass = ejabberd_odbc:escape(Password),