--- a/core/rostermanager.lua	Mon Jul 23 16:42:26 2012 +0100
+++ b/core/rostermanager.lua	Mon Jul 23 17:32:33 2012 +0100
@@ -83,15 +83,15 @@
 
 function load_roster(username, host)
 	local jid = username.."@"..host;
-	log("debug", "load_roster: asked for: "..jid);
+	log("debug", "load_roster: asked for: %s", jid);
 	local user = bare_sessions[jid];
 	local roster;
 	if user then
 		roster = user.roster;
 		if roster then return roster; end
-		log("debug", "load_roster: loading for new user: "..username.."@"..host);
+		log("debug", "load_roster: loading for new user: %s@%s", username, host);
 	else -- Attempt to load roster for non-loaded user
-		log("debug", "load_roster: loading for offline user: "..username.."@"..host);
+		log("debug", "load_roster: loading for offline user: %s@%s", username, host);
 	end
 	local data, err = datamanager.load(username, host, "roster");
 	roster = data or {};
@@ -99,7 +99,7 @@
 	if not roster[false] then roster[false] = { broken = err or nil }; end
 	if roster[jid] then
 		roster[jid] = nil;
-		log("warn", "roster for "..jid.." has a self-contact");
+		log("warn", "roster for %s has a self-contact", jid);
 	end
 	if not err then
 		hosts[host].events.fire_event("roster-load", username, host, roster);
@@ -108,7 +108,7 @@
 end
 
 function save_roster(username, host, roster)
-	log("debug", "save_roster: saving roster for "..username.."@"..host);
+	log("debug", "save_roster: saving roster for %s@%s", username, host);
 	if not roster then
 		roster = hosts[host] and hosts[host].sessions[username] and hosts[host].sessions[username].roster;
 		--if not roster then
@@ -238,7 +238,7 @@
 		roster[jid] = item;
 	end
 	item.ask = "subscribe";
-	log("debug", "set_contact_pending_out: saving roster; set "..username.."@"..host..".roster["..jid.."].ask=subscribe");
+	log("debug", "set_contact_pending_out: saving roster; set %s@%s.roster[%q].ask=subscribe", username, host, jid);
 	return save_roster(username, host, roster);
 end
 function unsubscribe(username, host, jid)

--- a/core/s2smanager.lua	Mon Jul 23 16:42:26 2012 +0100
+++ b/core/s2smanager.lua	Mon Jul 23 17:32:33 2012 +0100
@@ -87,7 +87,7 @@
 	
 	local from, to = session.from_host, session.to_host;
 	
-	session.log("info", session.direction.." s2s connection "..from.."->"..to.." complete");
+	session.log("info", "%s s2s connection %s->%s complete", session.direction, from, to);
 
 	local event_data = { session = session };
 	if session.type == "s2sout" then
@@ -105,7 +105,7 @@
 	
 	if session.direction == "outgoing" then
 		if sendq then
-			session.log("debug", "sending "..#sendq.." queued stanzas across new outgoing connection to "..session.to_host);
+			session.log("debug", "sending %d queued stanzas across new outgoing connection to %s", #sendq, session.to_host);
 			for i, data in ipairs(sendq) do
 				send(data[1]);
 				sendq[i] = nil;

--- a/core/sessionmanager.lua	Mon Jul 23 16:42:26 2012 +0100
+++ b/core/sessionmanager.lua	Mon Jul 23 17:32:33 2012 +0100
@@ -38,7 +38,7 @@
 		getmetatable(session.trace).__gc = function () open_sessions = open_sessions - 1; end;
 	end
 	open_sessions = open_sessions + 1;
-	log("debug", "open sessions now: ".. open_sessions);
+	log("debug", "open sessions now: %d", open_sessions);
 	
 	local filter = initialize_filters(session);
 	local w = conn.write;

--- a/plugins/adhoc/adhoc.lib.lua	Mon Jul 23 16:42:26 2012 +0100
+++ b/plugins/adhoc/adhoc.lib.lua	Mon Jul 23 17:32:33 2012 +0100
@@ -65,8 +65,8 @@
 				if (action == "prev") or (action == "next") or (action == "complete") then
 					actions:tag(action):up();
 				else
-					module:log("error", 'Command "'..command.name..
-						'" at node "'..command.node..'" provided an invalid action "'..action..'"');
+					module:log("error", "Command %q at node %q provided an invalid action %q",
+						command.name, command.node, action);
 				end
 			end
 			cmdtag:add_child(actions);

--- a/plugins/mod_admin_adhoc.lua	Mon Jul 23 16:42:26 2012 +0100
+++ b/plugins/mod_admin_adhoc.lua	Mon Jul 23 17:32:33 2012 +0100
@@ -63,15 +63,14 @@
 				return { status = "completed", error = { message = "Account already exists" } };
 			else
 				if usermanager_create_user(username, fields.password, host) then
-					module:log("info", "Created new account " .. username.."@"..host);
+					module:log("info", "Created new account %s@%s", username, host);
 					return { status = "completed", info = "Account successfully created" };
 				else
 					return { status = "completed", error = { message = "Failed to write data to disk" } };
 				end
 			end
 		else
-			module:log("debug", (fields.accountjid or "<nil>") .. " " .. (fields.password or "<nil>") .. " "
-				.. (fields["password-verify"] or "<nil>"));
+			module:log("debug", "Invalid data, password mismatch or empty username while creating account for %s", fields.accountjid or "<nil>");
 			return { status = "completed", error = { message = "Invalid data.\nPassword mismatch, or empty username" } };
 		end
 	else
@@ -143,10 +142,10 @@
 		for _, aJID in ipairs(fields.accountjids) do
 			local username, host, resource = jid.split(aJID);
 			if (host == data.to) and  usermanager_user_exists(username, host) and disconnect_user(aJID) and usermanager_create_user(username, nil, host) then
-				module:log("debug", "User " .. aJID .. " has been deleted");
+				module:log("debug", "User %s has been deleted", aJID);
 				succeeded[#succeeded+1] = aJID;
 			else
-				module:log("debug", "Tried to delete non-existant user "..aJID);
+				module:log("debug", "Tried to delete non-existant user %s", aJID);
 				failed[#failed+1] = aJID;
 			end
 		end
@@ -165,7 +164,7 @@
 	local sessions = host.sessions[node] and host.sessions[node].sessions;
 	for resource, session in pairs(sessions or {}) do
 		if not givenResource or (resource == givenResource) then
-			module:log("debug", "Disconnecting "..node.."@"..hostname.."/"..resource);
+			module:log("debug", "Disconnecting %s@%s/%s", node, hostname, resource);
 			session:close();
 		end
 	end

--- a/plugins/mod_component.lua	Mon Jul 23 16:42:26 2012 +0100
+++ b/plugins/mod_component.lua	Mon Jul 23 17:32:33 2012 +0100
@@ -124,7 +124,7 @@
 
 function stream_callbacks.error(session, error, data, data2)
 	if session.destroyed then return; end
-	module:log("warn", "Error processing component stream: "..tostring(error));
+	module:log("warn", "Error processing component stream: %s", tostring(error));
 	if error == "no-stream" then
 		session:close("invalid-namespace");
 	elseif error == "parse-error" then

--- a/plugins/mod_dialback.lua	Mon Jul 23 16:42:26 2012 +0100
+++ b/plugins/mod_dialback.lua	Mon Jul 23 17:32:33 2012 +0100
@@ -102,7 +102,6 @@
 	if origin.type == "s2sout_unauthed" or origin.type == "s2sout" then
 		local attr = stanza.attr;
 		local dialback_verifying = dialback_requests[attr.from.."/"..(attr.id or "")];
-		module:log("debug", tostring(dialback_verifying).." "..attr.from.." "..origin.to_host);
 		if dialback_verifying and attr.from == origin.to_host then
 			local valid;
 			if attr.type == "valid" then
@@ -110,7 +109,7 @@
 				valid = "valid";
 			else
 				-- Warn the original connection that is was not verified successfully
-				log("warn", "authoritative server for "..(attr.from or "(unknown)").." denied the key");
+				log("warn", "authoritative server for %s denied the key", attr.from or "(unknown)");
 				valid = "invalid";
 			end
 			if not dialback_verifying.sends2s then

--- a/plugins/mod_posix.lua	Mon Jul 23 16:42:26 2012 +0100
+++ b/plugins/mod_posix.lua	Mon Jul 23 17:32:33 2012 +0100
@@ -34,19 +34,19 @@
 		if gid then
 			local success, msg = pposix.setgid(gid);
 			if success then
-				module:log("debug", "Changed group to "..gid.." successfully.");
+				module:log("debug", "Changed group to %s successfully.", gid);
 			else
-				module:log("error", "Failed to change group to "..gid..". Error: "..msg);
-				prosody.shutdown("Failed to change group to "..gid);
+				module:log("error", "Failed to change group to %s. Error: %s", gid, msg);
+				prosody.shutdown("Failed to change group to %s", gid);
 			end
 		end
 		if uid then
 			local success, msg = pposix.setuid(uid);
 			if success then
-				module:log("debug", "Changed user to "..uid.." successfully.");
+				module:log("debug", "Changed user to %s successfully.", uid);
 			else
-				module:log("error", "Failed to change user to "..uid..". Error: "..msg);
-				prosody.shutdown("Failed to change user to "..uid);
+				module:log("error", "Failed to change user to %s. Error: %s", uid, msg);
+				prosody.shutdown("Failed to change user to %s", uid);
 			end
 		end
 	end);

--- a/plugins/mod_presence.lua	Mon Jul 23 16:42:26 2012 +0100
+++ b/plugins/mod_presence.lua	Mon Jul 23 17:32:33 2012 +0100
@@ -160,7 +160,7 @@
 			end
 		end
 	end
-	log("debug", "broadcasted presence of "..count.." resources from "..user.."@"..host.." to "..jid);
+	log("debug", "broadcasted presence of %d resources from %s@%s to %s", count, user, host, jid);
 	return count;
 end
 
@@ -169,7 +169,7 @@
 	if to_bare == from_bare then return; end -- No self contacts
 	local st_from, st_to = stanza.attr.from, stanza.attr.to;
 	stanza.attr.from, stanza.attr.to = from_bare, to_bare;
-	log("debug", "outbound presence "..stanza.attr.type.." from "..from_bare.." for "..to_bare);
+	log("debug", "outbound presence %s from %s for %s", stanza.attr.type, from_bare, to_bare);
 	if stanza.attr.type == "probe" then
 		stanza.attr.from, stanza.attr.to = st_from, st_to;
 		return;
@@ -214,7 +214,7 @@
 	local node, host = jid_split(to_bare);
 	local st_from, st_to = stanza.attr.from, stanza.attr.to;
 	stanza.attr.from, stanza.attr.to = from_bare, to_bare;
-	log("debug", "inbound presence "..stanza.attr.type.." from "..from_bare.." for "..to_bare);
+	log("debug", "inbound presence %s from %s for %s", stanza.attr.type, from_bare, to_bare);
 	
 	if stanza.attr.type == "probe" then
 		local result, err = rostermanager.is_contact_subscribed(node, host, from_bare);

--- a/plugins/mod_s2s/mod_s2s.lua	Mon Jul 23 16:42:26 2012 +0100
+++ b/plugins/mod_s2s/mod_s2s.lua	Mon Jul 23 17:32:33 2012 +0100
@@ -99,7 +99,7 @@
 				log("error", "We are going to send from %s instead of %s", tostring(host.from_host), tostring(from_host));
 			end
 			if host.sends2s(stanza) then
-				host.log("debug", "stanza sent over "..host.type);
+				host.log("debug", "stanza sent over %s", host.type);
 				return true;
 			end
 		end

--- a/util/datamanager.lua	Mon Jul 23 16:42:26 2012 +0100
+++ b/util/datamanager.lua	Mon Jul 23 17:32:33 2012 +0100
@@ -115,18 +115,18 @@
 	if not data then
 		local mode = lfs.attributes(getpath(username, host, datastore), "mode");
 		if not mode then
-			log("debug", "Assuming empty "..datastore.." storage ('"..ret.."') for user: "..(username or "nil").."@"..(host or "nil"));
+			log("debug", "Assuming empty %s storage ('%s') for user: %s@%s", datastore, ret, username or "nil", host or "nil");
 			return nil;
 		else -- file exists, but can't be read
 			-- TODO more detailed error checking and logging?
-			log("error", "Failed to load "..datastore.." storage ('"..ret.."') for user: "..(username or "nil").."@"..(host or "nil"));
+			log("error", "Failed to load %s storage ('%s') for user: %s@%s", datastore, ret, username or "nil", host or "nil");
 			return nil, "Error reading storage";
 		end
 	end
 	setfenv(data, {});
 	local success, ret = pcall(data);
 	if not success then
-		log("error", "Unable to load "..datastore.." storage ('"..ret.."') for user: "..(username or "nil").."@"..(host or "nil"));
+		log("error", "Unable to load %s storage ('%s') for user: %s@%s", datastore, ret, username or "nil", host or "nil");
 		return nil, "Error reading storage";
 	end
 	return ret;
@@ -145,7 +145,7 @@
 	-- save the datastore
 	local f, msg = io_open(getpath(username, host, datastore, nil, true), "w+");
 	if not f then
-		log("error", "Unable to write to "..datastore.." storage ('"..msg.."') for user: "..(username or "nil").."@"..(host or "nil"));
+		log("error", "Unable to write to %s storage ('%s') for user: %s@%s", datastore, msg, username or "nil", host or "nil");
 		return nil, "Error saving to storage";
 	end
 	f:write("return ");
@@ -166,7 +166,7 @@
 	-- save the datastore
 	local f, msg = io_open(getpath(username, host, datastore, "list", true), "a+");
 	if not f then
-		log("error", "Unable to write to "..datastore.." storage ('"..msg.."') for user: "..(username or "nil").."@"..(host or "nil"));
+		log("error", "Unable to write to %s storage ('%s') for user: %s@%s", datastore, msg, username or "nil", host or "nil");
 		return;
 	end
 	f:write("item(");
@@ -184,7 +184,7 @@
 	-- save the datastore
 	local f, msg = io_open(getpath(username, host, datastore, "list", true), "w+");
 	if not f then
-		log("error", "Unable to write to "..datastore.." storage ('"..msg.."') for user: "..(username or "nil").."@"..(host or "nil"));
+		log("error", "Unable to write to %s storage ('%s') for user: %s@%s", datastore, msg, username or "nil", host or "nil");
 		return;
 	end
 	for _, d in ipairs(data) do
@@ -207,11 +207,11 @@
 	if not data then
 		local mode = lfs.attributes(getpath(username, host, datastore, "list"), "mode");
 		if not mode then
-			log("debug", "Assuming empty "..datastore.." storage ('"..ret.."') for user: "..(username or "nil").."@"..(host or "nil"));
+			log("debug", "Assuming empty %s storage ('%s') for user: %s@%s", datastore, ret, username or "nil", host or "nil");
 			return nil;
 		else -- file exists, but can't be read
 			-- TODO more detailed error checking and logging?
-			log("error", "Failed to load "..datastore.." storage ('"..ret.."') for user: "..(username or "nil").."@"..(host or "nil"));
+			log("error", "Failed to load %s storage ('%s') for user: %s@%s", datastore, ret, username or "nil", host or "nil");
 			return nil, "Error reading storage";
 		end
 	end
@@ -219,7 +219,7 @@
 	setfenv(data, {item = function(i) t_insert(items, i); end});
 	local success, ret = pcall(data);
 	if not success then
-		log("error", "Unable to load "..datastore.." storage ('"..ret.."') for user: "..(username or "nil").."@"..(host or "nil"));
+		log("error", "Unable to load %s storage ('%s') for user: %s@%s", datastore, ret, username or "nil", host or "nil");
 		return nil, "Error reading storage";
 	end
 	return items;