NazerkeBS commented on a change in pull request #322:
URL: https://github.com/apache/solr/pull/322#discussion_r724024433



##########
File path: solr/core/src/java/org/apache/solr/core/ConfigSetService.java
##########
@@ -87,20 +80,61 @@ private static ConfigSetService instantiate(CoreContainer 
coreContainer) {
     }
   }
 
-  private static void bootstrapDefaultConfigSet(ConfigSetService 
configSetService) throws IOException {
-    if (configSetService.checkConfigExists("_default") == false) {
+  private void bootstrapConfigSet(CoreContainer coreContainer) {
+    // bootstrap _default conf, bootstrap_confdir and bootstrap_conf if 
provided via system property
+    try {
+      // _default conf
+      bootstrapDefaultConf();
+
+      // bootstrap_confdir
+      String confDir = System.getProperty("bootstrap_confdir");
+      if (confDir != null) {
+        bootstrapConfDir(confDir);
+      }
+
+      // bootstrap_conf, in SolrCloud mode
+      boolean boostrapConf = Boolean.getBoolean("bootstrap_conf");
+      if (boostrapConf == true) {
+        if (coreContainer.getZkController() != null) {
+          bootstrapConf(coreContainer);
+        }
+      }
+    } catch (UnsupportedOperationException e) {
+      log.info("Not bootstrapping configSets because they are read-only");
+    } catch (IOException e) {
+      throw new SolrException(
+          SolrException.ErrorCode.SERVER_ERROR, "Config couldn't be uploaded 
", e);
+    }
+  }
+
+  private void bootstrapDefaultConf() throws IOException {
+    if (this.checkConfigExists("_default") == false) {
       String configDirPath = getDefaultConfigDirPath();
       if (configDirPath == null) {
         log.warn(
-                "The _default configset could not be uploaded. Please provide 
'solr.default.confdir' parameter that points to a configset {} {}",
-                "intended to be the default. Current 'solr.default.confdir' 
value:",
-                
System.getProperty(SolrDispatchFilter.SOLR_DEFAULT_CONFDIR_ATTRIBUTE));
+            "The _default configset could not be uploaded. Please provide 
'solr.default.confdir' parameter that points to a configset {} {}",
+            "intended to be the default. Current 'solr.default.confdir' 
value:",
+            
System.getProperty(SolrDispatchFilter.SOLR_DEFAULT_CONFDIR_ATTRIBUTE));
       } else {
-        
configSetService.uploadConfig(ConfigSetsHandler.DEFAULT_CONFIGSET_NAME, 
Paths.get(configDirPath));
+        this.uploadConfig(ConfigSetsHandler.DEFAULT_CONFIGSET_NAME, 
Paths.get(configDirPath));
       }
     }
   }
 
+  private void bootstrapConfDir(String confDir) throws IOException {
+    Path configPath = Paths.get(confDir);
+    if (!Files.isDirectory(configPath)) {
+      throw new IllegalArgumentException(
+          String.format(

Review comment:
       I looked up other classes and some of them use String.format, so I 
followed 




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