Make use of safe file writing in auth handler (fixes #6576)

diff --git a/builtin/game/auth.lua b/builtin/game/auth.lua
index bf5bd19a8b7cb9d497df32ed6f83ed5cbb8a208b..3a478111c9b469cf45d1dc4703944d87ae2c7199 100644 (file)
--- a/builtin/game/auth.lua
+++ b/builtin/game/auth.lua
@@ -42,16 +42,15 @@ local function save_auth_file()
                assert(type(stuff.privileges) == "table")
                assert(stuff.last_login == nil or type(stuff.last_login) == "number")
        end
-       local file, errmsg = io.open(core.auth_file_path, 'w+b')
-       if not file then
-               error(core.auth_file_path.." could not be opened for writing: "..errmsg)
-       end
+       local content = ""
        for name, stuff in pairs(core.auth_table) do
                local priv_string = core.privs_to_string(stuff.privileges)
                local parts = {name, stuff.password, priv_string, stuff.last_login or ""}
-               file:write(table.concat(parts, ":").."\n")
+               content = content .. table.concat(parts, ":") .. "\n"
+       end
+       if not core.safe_file_write(core.auth_file_path, content) then
+               error(core.auth_file_path.." could not be written to")
        end
-       io.close(file)
 end
 
 read_auth_file()