appengine: more fixes

-added status handler to the config
-made pkg/jsonconfig/eval.go use the relative path
for the config file, since appengine does not like
absolute paths.

Change-Id: If9d275e308ae60e15ecd9c831e22fa6301de0be6

pkg/jsonconfig/eval.go

@@ -84,17 +84,17 @@ func (c *ConfigParser) ReadFile(path string) (m map[string]interface{}, err erro
 // Decodes and evaluates a json config file, watching for include cycles.
 func (c *ConfigParser) recursiveReadJSON(configPath string) (decodedObject map[string]interface{}, err error) {
 
-	configPath, err = filepath.Abs(configPath)
+	absConfigPath, err := filepath.Abs(configPath)
 	if err != nil {
 		return nil, fmt.Errorf("Failed to expand absolute path for %s", configPath)
 	}
-	if c.touchedFiles[configPath] {
+	if c.touchedFiles[absConfigPath] {
 		return nil, fmt.Errorf("ConfigParser include cycle detected reading config: %v",
-			configPath)
+			absConfigPath)
 	}
-	c.touchedFiles[configPath] = true
+	c.touchedFiles[absConfigPath] = true
 
-	c.includeStack.Push(configPath)
+	c.includeStack.Push(absConfigPath)
 	defer c.includeStack.Pop()
 
 	var f File

server/appengine/config.json

@@ -8,6 +8,7 @@
          "handlerArgs": {
              "ownerName": "TODO:AppEngineOwnerName",
              "blobRoot": "/bs-and-maybe-also-index/",
+             "statusRoot": "/status/",
              "searchRoot": "/my-search/",
              "stealth": false
          }
@@ -20,6 +21,10 @@
       }
     },
 
+     "/status/": {
+         "handler": "status"
+     },
+
     "/bs-and-maybe-also-index/": {
       "handler": "storage-cond",
       "handlerArgs": {