core: unpack: Add --keep-packs option

Matches the pack --keep-all-loose.

src/ostree/ot-builtin-unpack.c

@@ -31,7 +31,10 @@
 #include <gio/gunixinputstream.h>
 #include <gio/gunixoutputstream.h>
 
+static gboolean opt_keep_packs;
+
 static GOptionEntry options[] = {
+  { "keep-packs", 0, 0, G_OPTION_ARG_NONE, &opt_keep_packs, "Don't delete pack files", NULL },
   { NULL }
 };
 
@@ -219,6 +222,8 @@ ostree_builtin_unpack (int argc, char **argv, GFile *repo_path, GError **error)
   if (!ostree_repo_commit_transaction (repo, cancellable, error))
     goto out;
 
+  if (!opt_keep_packs)
+    {
       if (g_hash_table_size (meta_packfiles_to_delete) == 0
           && g_hash_table_size (data_packfiles_to_delete) == 0)
         g_print ("No pack files; nothing to do\n");
@@ -247,6 +252,9 @@ ostree_builtin_unpack (int argc, char **argv, GFile *repo_path, GError **error)
 
       if (!ostree_repo_regenerate_pack_index (repo, cancellable, error))
         goto out;
+    }
+
+  g_print ("Unpacked %" G_GUINT64_FORMAT " objects\n", unpacked_object_count);
 
   ret = TRUE;
  out: