ansible-playbook can load extra vars from a file, with "@" syntax

bin/ansible-playbook

@@ -94,10 +94,20 @@ def main(args):
         options.ask_sudo_pass = options.ask_sudo_pass or C.DEFAULT_ASK_SUDO_PASS
         ( sshpass, sudopass ) = utils.ask_passwords(ask_pass=options.ask_pass, ask_sudo_pass=options.ask_sudo_pass)
         options.sudo_user = options.sudo_user or C.DEFAULT_SUDO_USER
-    if options.extra_vars and options.extra_vars[0] in '[{':
-        extra_vars = utils.json_loads(options.extra_vars)
-    else:
-        extra_vars = utils.parse_kv(options.extra_vars)
+
+    extra_vars = {}
+    if options.extra_vars:
+        if options.extra_vars.startswith("@"):
+            # Argument is a JSON file
+            with open(options.extra_vars[1:]) as fd:
+                extra_vars = utils.json_loads(fd.read())
+        elif options.extra_vars[0] in '[{':
+            # Arguments as JSON
+            extra_vars = utils.json_loads(options.extra_vars)
+        else:
+            # Arguments as Key-value
+            extra_vars = utils.parse_kv(options.extra_vars)
+
     only_tags = options.tags.split(",")
     skip_tags = options.skip_tags
     if options.skip_tags is not None: