Allow to show only specific images in listing

src/cli.cpp

@@ -85,14 +85,14 @@ void cli_tool_t::help()
         "(c) Vitaliy Filippov, 2019+ (VNPL-1.1)\n"
         "\n"
         "USAGE:\n"
-        "%s ls [-l] [--del] [-p <id|name>] [-w]\n"
-        "  List images.\n"
+        "%s ls [-l] [-p POOL] [--sort FIELD] [-r] [-n N] [<name> ...]\n"
+        "  List images (only specified if <name> passed).\n"
         "  -p|--pool POOL  Filter images by pool ID or name\n"
         "  -l|--long       Also report allocated size and I/O statistics\n"
         "  --del           Also include delete operation statistics\n"
-        "  --sort <field>  Sort by specified field (name, size, used_size, <read|write|delete>_<iops|bps|lat|queue>)\n"
+        "  --sort FIELD    Sort by specified field (name, size, used_size, <read|write|delete>_<iops|bps|lat|queue>)\n"
         "  -r|--reverse    Sort in descending order\n"
-        "  --top <n>       Only list top <n> items\n"
+        "  -n|--count N    Only list first N items\n"
         "\n"
         "%s create -s|--size <size> [-p|--pool <id|name>] [--parent <parent_name>[@<snapshot>]] <name>\n"
         "  Create an image. You may use K/M/G/T suffixes for <size>. If --parent is specified,\n"

src/cli_ls.cpp

@@ -26,6 +26,7 @@ struct image_lister_t
     pool_id_t list_pool_id = 0;
     std::string list_pool_name;
     std::string sort_field;
+    std::set<std::string> only_names;
     bool reverse = false;
     int max_count = 0;
     bool show_stats = false, show_delete = false;
@@ -212,7 +213,10 @@ resume_1:
         json11::Json::array list;
         for (auto & kv: stats)
         {
-            list.push_back(kv.second);
+            if (!only_names.size() || only_names.find(kv.second["name"].string_value()) != only_names.end())
+            {
+                list.push_back(kv.second);
+            }
         }
         if (sort_field == "name" || sort_field == "pool_name")
         {
@@ -500,7 +504,11 @@ std::function<bool(void)> cli_tool_t::start_ls(json11::Json cfg)
     lister->show_delete = cfg["del"].bool_value();
     lister->sort_field = cfg["sort"].string_value();
     lister->reverse = cfg["reverse"].bool_value();
-    lister->max_count = cfg["top"].uint64_value();
+    lister->max_count = cfg["count"].uint64_value();
+    for (int i = 0; i < cmd.size(); i++)
+    {
+        lister->only_names.insert(cmd[i].string_value());
+    }
     return [lister]()
     {
         lister->loop();