Ask for confirmation if config exists.

yarrbox.py

@@ -1,5 +1,6 @@
 #!/usr/bin/env python3
 
+import os
 from collections import OrderedDict
 import sys
 
@@ -85,6 +86,14 @@ def main():
 
     command = sys.argv[1]
     if command == 'init':
+        # Check if a config already exists
+        if os.path.exists('config.json'):
+            print('A config exists here, overwrite? [y/n, default: n] ', end='', flush=True)
+            yesno = input()
+            if yesno != 'y':
+                print('leaving config unchanged')
+                sys.exit(1)
+
         # Make a new config object and read all the properties.
         cfg = {}
         for k in PROPS:
@@ -110,6 +119,7 @@ def main():
         # Load the config.
         cfg = read_config()
 
+        # Read the template.
         tmplt = None
         try:
             with open('compose-template.yml', 'r') as f:
@@ -118,6 +128,7 @@ def main():
             print('error reading template:', e)
             sys.exit(1)
 
+        # Fill in the template and save it.
         gen = apply_template_settings(tmplt, cfg)
         try:
             with open('docker-compose.yml', 'w') as f: