add more info to repository scan log messages (#3921)

so that it is visible also when adding repositories via API

Author: vladak

opengrok-indexer/src/main/java/org/opengrok/indexer/history/HistoryGuru.java

@@ -545,10 +545,12 @@ public Collection<RepositoryInfo> addRepositories(File[] files) {
             try {
                 repoList.addAll(future.get());
             } catch (Exception e) {
-                LOGGER.log(Level.WARNING, "failed to get results of repository scan");
+                LOGGER.log(Level.WARNING, "failed to get results of repository scan", e);
             }
         });
 
+        LOGGER.log(Level.FINER, "Discovered repositories: {0}", repoList);
+
         return repoList;
     }
 

opengrok-indexer/src/main/java/org/opengrok/indexer/history/RepositoryInfo.java

@@ -18,7 +18,7 @@
  */
 
 /*
- * Copyright (c) 2008, 2021, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2008, 2022, Oracle and/or its affiliates. All rights reserved.
  * Portions Copyright (c) 2017, 2019, Chris Fraire <[email protected]>.
  */
 package org.opengrok.indexer.history;
@@ -344,4 +344,9 @@ public int hashCode() {
         hash = 89 * hash + Objects.hashCode(this.directoryNameRelative);
         return hash;
     }
+
+    @Override
+    public String toString() {
+        return type + ":" + directoryNameRelative;
+    }
 }

opengrok-indexer/src/main/java/org/opengrok/indexer/index/Indexer.java

@@ -1009,7 +1009,8 @@ public void prepareIndexer(RuntimeEnvironment env,
         }
 
         if (!searchPaths.isEmpty()) {
-            LOGGER.log(Level.INFO, "Scanning for repositories in {0}...", searchPaths);
+            LOGGER.log(Level.INFO, "Scanning for repositories in {0} (down to {1} levels below source root)",
+                    new Object[]{searchPaths, env.getScanningDepth()});
             Statistics stats = new Statistics();
             env.setRepositories(searchPaths.toArray(new String[0]));
             stats.report(LOGGER, String.format("Done scanning for repositories, found %d repositories",