init: Add a flag to force-delete the cache

This allows batch mode upgrades with cache deletion.

Change-Id: I92be9d1685f1165b039812e47c9332a8bb0ea831

Documentation/pgm-init.txt

@@ -10,6 +10,7 @@ installation.
 _java_ -jar gerrit.war _init_
   -d <SITE_PATH>
   [--batch]
+  [--delete-caches]
   [--no-auto-start]
   [--skip-plugins]
   [--list-plugins]
@@ -42,6 +43,10 @@ are detected, they are *not* automatically dropped; a list of SQL
 statements to drop these objects is provided. To drop the unused
 objects these SQL statements must be executed manually.
 
+--delete-caches::
+	Force deletion of all persistent cache files. Note that
+	re-creation of these caches may be expensive.
+
 --no-auto-start::
 	Don't automatically start the daemon after initializing a
 	newly created site path.  This permits the administrator

gerrit-pgm/src/main/java/com/google/gerrit/pgm/Init.java

@@ -49,6 +49,10 @@ public class Init extends BaseInit {
       usage = "Batch mode; skip interactive prompting")
   private boolean batchMode;
 
+  @Option(name = "--delete-caches",
+      usage = "Delete all persistent caches without asking")
+  private boolean deleteCaches;
+
   @Option(name = "--no-auto-start", usage = "Don't automatically start daemon after init")
   private boolean noAutoStart;
 
@@ -159,6 +163,12 @@ public class Init extends BaseInit {
     return !noAutoStart;
   }
 
+  @Override
+  protected boolean getDeleteCaches() {
+    return deleteCaches;
+  }
+
+
   @Override
   protected boolean skipPlugins() {
     return skipPlugins;

gerrit-pgm/src/main/java/com/google/gerrit/pgm/init/BaseInit.java

@@ -119,6 +119,8 @@ public class BaseInit extends SiteProgram {
     init.flags.autoStart = getAutoStart() && init.site.isNew;
     init.flags.dev = isDev() && init.site.isNew;
     init.flags.skipPlugins = skipPlugins();
+    init.flags.deleteCaches = getDeleteCaches();
+
 
     final SiteRun run;
     try {
@@ -471,4 +473,8 @@ public class BaseInit extends SiteProgram {
   protected boolean isDev() {
     return false;
   }
+
+  protected boolean getDeleteCaches() {
+    return false;
+  }
 }

gerrit-pgm/src/main/java/com/google/gerrit/pgm/init/InitCache.java

@@ -16,6 +16,7 @@ package com.google.gerrit.pgm.init;
 
 import com.google.gerrit.common.FileUtil;
 import com.google.gerrit.pgm.init.api.ConsoleUI;
+import com.google.gerrit.pgm.init.api.InitFlags;
 import com.google.gerrit.pgm.init.api.InitStep;
 import com.google.gerrit.pgm.init.api.Section;
 import com.google.gerrit.server.config.SitePaths;
@@ -33,13 +34,15 @@ import java.util.List;
 @Singleton
 class InitCache implements InitStep {
   private final ConsoleUI ui;
+  private final InitFlags flags;
   private final SitePaths site;
   private final Section cache;
 
   @Inject
-  InitCache(final ConsoleUI ui, final SitePaths site,
-      final Section.Factory sections) {
+  InitCache(final ConsoleUI ui, final InitFlags flags,
+      final SitePaths site, final Section.Factory sections) {
     this.ui = ui;
+    this.flags = flags;
     this.site = site;
     this.cache = sections.get("cache", null);
   }
@@ -75,7 +78,8 @@ class InitCache implements InitStep {
     }
     if (!cacheFiles.isEmpty()) {
       for (Path entry : cacheFiles) {
-        if (ui.yesno(false, "Delete cache file %s", entry)) {
+        if (flags.deleteCaches ||
+            ui.yesno(false, "Delete cache file %s", entry)) {
           try {
             Files.deleteIfExists(entry);
           } catch (IOException e) {

gerrit-pgm/src/main/java/com/google/gerrit/pgm/init/api/InitFlags.java

@@ -39,6 +39,9 @@ public class InitFlags {
   /** Skip plugins */
   public boolean skipPlugins;
 
+  /** Delete all cache files */
+  public boolean deleteCaches;
+
   /** Dev mode */
   public boolean dev;