rc: config/unlock: rename parameter to configPassword accept old as well

We accidentally added a non `camelCase` parameter to the rc
(`config_password`)- this fixes it (to `configPassword`) but accepts
the old name too as it has been in a release.

fs/config/rc.go

@@ -20,7 +20,7 @@ Unlocks the config file if it is locked.
 
 Parameters:
 
-- 'config_password' - password to unlock the config file
+- 'configPassword' - password to unlock the config file
 
 A good idea is to disable AskPassword before making this call
 `,
@@ -30,10 +30,14 @@ A good idea is to disable AskPassword before making this call
 // Unlock the config file
 // A good idea is to disable AskPassword before making this call
 func rcConfigPassword(ctx context.Context, in rc.Params) (out rc.Params, err error) {
-	configPass, err := in.GetString("config_password")
+	configPass, err := in.GetString("configPassword")
 	if err != nil {
+		var err2 error
+		configPass, err2 = in.GetString("config_password") // backwards compat
+		if err2 != nil {
 			return nil, err
 		}
+	}
 	if SetConfigPassword(configPass) != nil {
 		return nil, errors.New("failed to set config password")
 	}

fs/config/rc_test.go

@@ -215,13 +215,26 @@ func TestRcPaths(t *testing.T) {
 func TestRcConfigUnlock(t *testing.T) {
 	call := rc.Calls.Get("config/unlock")
 	assert.NotNil(t, call)
+
 	in := rc.Params{
-		"config_password": "test",
+		"configPassword": "test",
 	}
 	out, err := call.Fn(context.Background(), in)
 	require.NoError(t, err)
-
-	assert.Nil(t, err)
 	assert.Nil(t, out)
 
+	in = rc.Params{
+		"config_password": "test",
+	}
+	out, err = call.Fn(context.Background(), in)
+	require.NoError(t, err)
+	assert.Nil(t, out)
+
+	in = rc.Params{
+		"bad_config_password": "test",
+	}
+	out, err = call.Fn(context.Background(), in)
+	require.Error(t, err)
+	assert.ErrorContains(t, err, `Didn't find key "configPassword" in input`)
+	assert.Nil(t, out)
 }