From 933b33ee15bb257fd3226e8de0e40f832edc511f Mon Sep 17 00:00:00 2001
From: colin <colin@noreply@nixc.us>
Date: Sun, 21 Jan 2024 15:45:52 +0000
Subject: [PATCH] Add docker/headscale/start.sh

---
 docker/headscale/start.sh | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)
 create mode 100644 docker/headscale/start.sh

diff --git a/docker/headscale/start.sh b/docker/headscale/start.sh
new file mode 100644
index 0000000..9f96883
--- /dev/null
+++ b/docker/headscale/start.sh
@@ -0,0 +1,36 @@
+#!/bin/bash
+
+replace_config_values() {
+    local config_template="/etc/headscale/config-example.yaml"
+    local config_output="/etc/headscale/config.yaml"
+
+    # Check if the output config file already exists
+    if [[ -f "$config_output" ]]; then
+        echo "$config_output already exists."
+        return 0
+    fi
+
+    # Ensure the template file exists
+    if [[ ! -f "$config_template" ]]; then
+        echo "Template file $config_template not found."
+        return 1
+    fi
+
+    # Read the template and replace variables
+    local temp_file=$(mktemp)
+    cp "$config_template" "$temp_file"
+    while read -r line; do
+        while [[ "$line" =~ (\$\{[a-zA-Z_][a-zA-Z_0-9]*\}) ]]; do
+            LHS=${BASH_REMATCH[1]}
+            RHS="$(eval echo "\"$LHS\"")"
+            line=${line//$LHS/$RHS}
+        done
+        echo "$line"
+    done < "$temp_file" > "$config_output"
+    rm "$temp_file"
+
+    echo "Config file generated at $config_output"
+}
+
+# Example usage in your startup script
+replace_config_values