Initial commit: Chrony NTP Server add-on for Home Assistant

- NTP client syncs from configurable pools and servers
- NTP server mode serves time to LAN clients
- Web UI dashboard showing sync status, sources, and clients
- Supports iburst and maxsources options

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

chrony-addon/rootfs/etc/s6-overlay/s6-rc.d/chrony/run

@@ -0,0 +1,77 @@
+#!/command/with-contenv bash
+# Generate chrony configuration from add-on options
+
+CONFIG_FILE="/etc/chrony/chrony.conf"
+OPTIONS_FILE="/data/options.json"
+
+echo "[INFO] Generating Chrony configuration..."
+
+# Create config directory
+mkdir -p /etc/chrony /var/lib/chrony /var/log/chrony
+
+# Start with base config
+cat > "$CONFIG_FILE" << 'EOF'
+# Chrony configuration - generated by Home Assistant add-on
+driftfile /var/lib/chrony/chrony.drift
+makestep 1.0 3
+rtcsync
+logdir /var/log/chrony
+EOF
+
+# Parse options.json with jq
+if [ -f "$OPTIONS_FILE" ]; then
+    # Add NTP pools
+    pool_count=$(jq '.ntp_pools | length' "$OPTIONS_FILE")
+    for i in $(seq 0 $((pool_count - 1))); do
+        pool_addr=$(jq -r ".ntp_pools[$i].pool" "$OPTIONS_FILE")
+        iburst=$(jq -r ".ntp_pools[$i].iburst" "$OPTIONS_FILE")
+        maxsources=$(jq -r ".ntp_pools[$i].maxsources" "$OPTIONS_FILE")
+
+        pool_line="pool ${pool_addr}"
+        [ "$iburst" = "true" ] && pool_line="${pool_line} iburst"
+        [ "$maxsources" != "null" ] && pool_line="${pool_line} maxsources ${maxsources}"
+
+        echo "$pool_line" >> "$CONFIG_FILE"
+        echo "[INFO] Added NTP pool: ${pool_addr}"
+    done
+
+    # Add NTP servers
+    server_count=$(jq '.ntp_servers | length' "$OPTIONS_FILE")
+    for i in $(seq 0 $((server_count - 1))); do
+        server_addr=$(jq -r ".ntp_servers[$i].server" "$OPTIONS_FILE")
+        iburst=$(jq -r ".ntp_servers[$i].iburst" "$OPTIONS_FILE")
+
+        if [ "$iburst" = "true" ]; then
+            echo "server ${server_addr} iburst" >> "$CONFIG_FILE"
+        else
+            echo "server ${server_addr}" >> "$CONFIG_FILE"
+        fi
+        echo "[INFO] Added NTP server: ${server_addr}"
+    done
+
+    # Configure as NTP server if enabled
+    enable_server=$(jq -r '.enable_ntp_server' "$OPTIONS_FILE")
+    if [ "$enable_server" = "true" ]; then
+        echo "[INFO] NTP server mode enabled"
+
+        # Add allowed client networks
+        for network in $(jq -r '.allow_clients[]' "$OPTIONS_FILE"); do
+            echo "allow ${network}" >> "$CONFIG_FILE"
+            echo "[INFO] Allowing clients from: ${network}"
+        done
+    fi
+
+    # Set logging
+    detailed_logging=$(jq -r '.detailed_logging' "$OPTIONS_FILE")
+    if [ "$detailed_logging" = "true" ]; then
+        echo "log tracking measurements statistics" >> "$CONFIG_FILE"
+        echo "[INFO] Detailed logging enabled"
+    else
+        echo "log tracking" >> "$CONFIG_FILE"
+    fi
+fi
+
+echo "[INFO] Chrony configuration generated successfully"
+
+# Start chrony in foreground
+exec chronyd -d -f "$CONFIG_FILE"

chrony-addon/rootfs/etc/s6-overlay/s6-rc.d/chrony/type

@@ -0,0 +1 @@
+longrun

chrony-addon/rootfs/etc/s6-overlay/s6-rc.d/webui/run

@@ -0,0 +1,4 @@
+#!/command/with-contenv bash
+
+cd /var/www
+exec python3 /var/www/app.py

chrony-addon/rootfs/etc/s6-overlay/s6-rc.d/webui/type

@@ -0,0 +1 @@
+longrun