Add `-U/--unset option to config save`

CHANGELOG.md

@@ -4,6 +4,7 @@ Note: Breaking changes between versions are indicated by "💥".
 
 ## Latest
 
+- [Improvement] Add ``-U/--unset`` option to ``config save``
 - [Bugfix] Fix insecure static asset loading when web proxy is enabled
 - [Improvement] Rename ``SECRET_KEY`` configuration parameter to ``OPENEDX_SECRET_KEY``
 - [Improvement] Add support for SSL and TLS in external SMTP server (#231)

tutor/commands/config.py

@@ -20,11 +20,27 @@ def config_command():
 @click.command(help="Create and save configuration interactively")
 @opts.root
 @click.option("-i", "--interactive", is_flag=True, help="Run interactively")
-@opts.key_value
-def save(root, interactive, set_):
+@click.option(
+    "-s",
+    "--set",
+    "set_",
+    type=opts.YamlParamType(),
+    multiple=True,
+    metavar="KEY=VAL",
+    help="Set a configuration value (can be used multiple times)",
+)
+@click.option(
+    "-U",
+    "--unset",
+    multiple=True,
+    help="Remove a configuration value (can be used multiple times)",
+)
+def save(root, interactive, set_, unset):
     config, defaults = interactive_config.load_all(root, interactive=interactive)
     if set_:
         tutor_config.merge(config, dict(set_), force=True)
+    for key in unset:
+        config.pop(key, None)
     tutor_config.save(root, config)
     tutor_config.merge(config, defaults)
     env.save(root, config)

tutor/opts.py

@@ -40,14 +40,3 @@ class YamlParamType(click.ParamType):
         except ValueError:
             self.fail("'{}' is not of the form 'key=value'.".format(value), param, ctx)
         return k, serialize.parse_value(v)
-
-
-key_value = click.option(
-    "-s",
-    "--set",
-    "set_",
-    type=YamlParamType(),
-    multiple=True,
-    metavar="KEY=VAL",
-    help="Set a configuration value (can be used multiple times)",
-)