Create update-settings.py

update-settings.py

@@ -0,0 +1,82 @@
+#!/usr/bin/env python
+import os
+import shutil
+
+env = os.environ.get
+
+smtp_settings = [
+    ('username', ''),
+    ('password', ''),
+    ('host', 'localhost'),
+    ('port', '25'),
+    ('security', 'none'),
+    ('to', ''),
+    ('from', ''),
+]
+
+required = ['to', 'from']
+
+settings = env('ISSO_SETTINGS')
+if not settings:
+    raise Exception('No ISSO_SETTINGS defined')
+
+settings = settings.split(';')
+
+
+def backup_name(setting):
+    return setting + '.bak'
+
+
+def purge_backup(setting):
+    # if there is a backup file, delete it
+    backup_setting = backup_name(setting)
+    if os.path.exists(backup_setting):
+        try:
+            os.remove(backup_setting)
+        except OSError:
+            pass
+
+
+def create_backup(setting):
+    # make a backup
+    shutil.copyfile(setting, backup_name(setting))
+
+
+def load_values():
+    values = []
+    for name, default in smtp_settings:
+        label = 'ISSO_SMTP_%s' % name.upper()
+        value = env(label, default)
+        if name in required and not value.strip():
+            raise Exception('Required environment variable is not set: %s' %
+                            label)
+        values.append([label, value])
+    return values
+
+
+def replace_placeholders(setting, values):
+    with open(setting, 'r') as _file:
+        content = _file.read()
+
+    for label, value in values:
+        content = content.replace(label, value)
+
+    # make a backup
+    create_backup(setting)
+
+    with open(setting, 'w') as _file:
+        _file.write(content)
+
+    return content
+
+
+def main():
+    values = load_values()
+
+    for setting in settings:
+        print("Replacing settings %s" % setting)
+        replace_placeholders(setting, values)
+
+
+if __name__ == '__main__':
+    main()