From: Michael Tremer <michael.tremer@ipfire.org>
Date: Tue, 12 May 2026 16:02:12 +0000 (+0100)
Subject: knot-resolver: Create a helper function that will call functions on changes
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=4040f21cbd7a5859c4e338c4cb2264d643ca7eca;p=ipfire-2.x.git

knot-resolver: Create a helper function that will call functions on changes

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>
---

diff --git a/config/knot-resolver/kresd.conf b/config/knot-resolver/kresd.conf
index e54978742..f0fe64134 100644
--- a/config/knot-resolver/kresd.conf
+++ b/config/knot-resolver/kresd.conf
@@ -9,7 +9,36 @@ log_target("syslog")
 log_level("info")
 -- log_level("debug")
 
+-- Load required Lua modules
+local bit = require("bit")
 local csv = require("csv")
+local notify = require("cqueues.notify")
+
+-- Helper function which will call a function if a given file has been changed
+local function call_on_change(path, callback)
+	-- Split the path into parent directory and filename
+	local dir, file = string.match(path, "(.*)/([^/]+)")
+
+	-- If we could not split the path (e.g. because it doesn't contain a /)
+	-- we will assume the file is in the current working directory
+	if not dir and not file then
+		dir = "."
+		file = path
+	end
+
+	-- Create a new watcher for the directory
+	local watcher = notify.opendir(dir)
+
+	-- Wake up when the file has changed
+	watcher:add(file, bit.bxor(notify.CREATE, notify.MODIFY))
+
+	-- Register a function that will call the callback on any changes
+	worker.coroutine(function()
+		for _, name in watcher:changes() do
+			callback()
+		end
+	end)
+end
 
 local ETHERNET_SETTINGS_FILE = "/var/ipfire/ethernet/settings"
 local DNS_SETTINGS_FILE = "/var/ipfire/dns/settings"