babeltrace(1): add the query-info command
[babeltrace.git] / converter / babeltrace-cfg.c
index e09973578555bcd4f45b14031cce4bd1abe7d794..6e07a43749822a3d705360e6f3e5a3aceea5a5b8 100644 (file)
@@ -37,6 +37,7 @@
 #include <sys/types.h>
 #include <pwd.h>
 #include "babeltrace-cfg.h"
+#include "babeltrace-cfg-connect.h"
 
 #define DEFAULT_SOURCE_COMPONENT_NAME  "ctf.fs"
 #define DEFAULT_SINK_COMPONENT_NAME    "text.text"
@@ -712,6 +713,10 @@ void bt_config_component_destroy(struct bt_object *obj)
                g_string_free(bt_config_component->component_name, TRUE);
        }
 
+       if (bt_config_component->instance_name) {
+               g_string_free(bt_config_component->instance_name, TRUE);
+       }
+
        BT_PUT(bt_config_component->params);
        g_free(bt_config_component);
 
@@ -727,8 +732,9 @@ end:
  * Return value is owned by the caller.
  */
 static
-struct bt_config_component *bt_config_component_create(const char *plugin_name,
-               const char *component_name)
+struct bt_config_component *bt_config_component_create(
+               enum bt_component_class_type type,
+               const char *plugin_name, const char *component_name)
 {
        struct bt_config_component *cfg_component = NULL;
 
@@ -739,6 +745,7 @@ struct bt_config_component *bt_config_component_create(const char *plugin_name,
        }
 
        bt_object_init(cfg_component, bt_config_component_destroy);
+       cfg_component->type = type;
        cfg_component->plugin_name = g_string_new(plugin_name);
        if (!cfg_component->plugin_name) {
                print_err_oom();
@@ -751,6 +758,12 @@ struct bt_config_component *bt_config_component_create(const char *plugin_name,
                goto error;
        }
 
+       cfg_component->instance_name = g_string_new(NULL);
+       if (!cfg_component->instance_name) {
+               print_err_oom();
+               goto error;
+       }
+
        /* Start with empty parameters */
        cfg_component->params = bt_value_map_create();
        if (!cfg_component->params) {
@@ -771,8 +784,8 @@ end:
  * Creates a component configuration from a command-line source/sink
  * option's argument.
  */
-static
-struct bt_config_component *bt_config_component_from_arg(const char *arg)
+struct bt_config_component *bt_config_component_from_arg(
+               enum bt_component_class_type type, const char *arg)
 {
        struct bt_config_component *bt_config_component = NULL;
        char *plugin_name;
@@ -784,7 +797,7 @@ struct bt_config_component *bt_config_component_from_arg(const char *arg)
                goto error;
        }
 
-       bt_config_component = bt_config_component_create(plugin_name,
+       bt_config_component = bt_config_component_create(type, plugin_name,
                component_name);
        if (!bt_config_component) {
                goto error;
@@ -820,17 +833,36 @@ void bt_config_destroy(struct bt_object *obj)
                        g_ptr_array_free(cfg->cmd_data.convert.sources, TRUE);
                }
 
+               if (cfg->cmd_data.convert.filters) {
+                       g_ptr_array_free(cfg->cmd_data.convert.filters, TRUE);
+               }
+
                if (cfg->cmd_data.convert.sinks) {
                        g_ptr_array_free(cfg->cmd_data.convert.sinks, TRUE);
                }
 
+               if (cfg->cmd_data.convert.connections) {
+                       g_ptr_array_free(cfg->cmd_data.convert.connections,
+                               TRUE);
+               }
+
                BT_PUT(cfg->cmd_data.convert.plugin_paths);
                break;
-
        case BT_CONFIG_COMMAND_LIST_PLUGINS:
                BT_PUT(cfg->cmd_data.list_plugins.plugin_paths);
                break;
+       case BT_CONFIG_COMMAND_HELP:
+               BT_PUT(cfg->cmd_data.help.plugin_paths);
+               BT_PUT(cfg->cmd_data.help.cfg_component);
+               break;
+       case BT_CONFIG_COMMAND_QUERY_INFO:
+               BT_PUT(cfg->cmd_data.query_info.plugin_paths);
+               BT_PUT(cfg->cmd_data.query_info.cfg_component);
 
+               if (cfg->cmd_data.query_info.action) {
+                       g_string_free(cfg->cmd_data.query_info.action, TRUE);
+               }
+               break;
        default:
                assert(false);
        }
@@ -1334,7 +1366,7 @@ int append_sinks_from_legacy_opts(GPtrArray *sinks,
                component_name = "metadata-text";
                break;
        case LEGACY_OUTPUT_FORMAT_DUMMY:
-               plugin_name = "dummy";
+               plugin_name = "utils";
                component_name = "dummy";
                break;
        default:
@@ -1361,8 +1393,8 @@ int append_sinks_from_legacy_opts(GPtrArray *sinks,
        }
 
        /* Create a component configuration */
-       bt_config_component = bt_config_component_create(plugin_name,
-               component_name);
+       bt_config_component = bt_config_component_create(
+               BT_COMPONENT_CLASS_TYPE_SINK, plugin_name, component_name);
        if (!bt_config_component) {
                goto error;
        }
@@ -1490,8 +1522,8 @@ int append_sources_from_legacy_opts(GPtrArray *sources,
                }
 
                /* Create a component configuration */
-               bt_config_component = bt_config_component_create("ctf",
-                       component_name);
+               bt_config_component = bt_config_component_create(
+                       BT_COMPONENT_CLASS_TYPE_SOURCE, "ctf", component_name);
                if (!bt_config_component) {
                        goto error;
                }
@@ -1655,7 +1687,7 @@ void print_output_legacy_to_sinks(
                enum legacy_output_format legacy_output_format,
                struct text_legacy_opts *text_legacy_opts)
 {
-       const char *input_format;
+       const char *output_format;
        GString *str = NULL;
 
        str = g_string_new("    ");
@@ -1666,22 +1698,22 @@ void print_output_legacy_to_sinks(
 
        switch (legacy_output_format) {
        case LEGACY_OUTPUT_FORMAT_TEXT:
-               input_format = "text";
+               output_format = "text";
                break;
        case LEGACY_OUTPUT_FORMAT_CTF_METADATA:
-               input_format = "ctf-metadata";
+               output_format = "ctf-metadata";
                break;
        case LEGACY_OUTPUT_FORMAT_DUMMY:
-               input_format = "dummy";
+               output_format = "dummy";
                break;
        default:
                assert(false);
        }
 
        printf_err("Both `%s` legacy output format and non-legacy sink component\ninstances(s) specified.\n\n",
-               input_format);
+               output_format);
        printf_err("Specify the following non-legacy sink component instance instead of the\nlegacy `%s` output format options:\n\n",
-               input_format);
+               output_format);
        g_string_append(str, "-o ");
 
        switch (legacy_output_format) {
@@ -1692,7 +1724,7 @@ void print_output_legacy_to_sinks(
                g_string_append(str, "ctf.metadata-text");
                break;
        case LEGACY_OUTPUT_FORMAT_DUMMY:
-               g_string_append(str, "dummy.dummy");
+               g_string_append(str, "utils.dummy");
                break;
        default:
                assert(false);
@@ -1979,15 +2011,18 @@ enum {
        OPT_CLOCK_OFFSET,
        OPT_CLOCK_OFFSET_NS,
        OPT_CLOCK_SECONDS,
+       OPT_CONNECT,
        OPT_DEBUG,
        OPT_DEBUG_INFO_DIR,
        OPT_DEBUG_INFO_FULL_PATH,
        OPT_DEBUG_INFO_TARGET_PREFIX,
        OPT_END,
        OPT_FIELDS,
+       OPT_FILTER,
        OPT_HELP,
        OPT_INPUT_FORMAT,
        OPT_LIST,
+       OPT_NAME,
        OPT_NAMES,
        OPT_NO_DELTA,
        OPT_OMIT_HOME_PLUGIN_PATH,
@@ -2191,6 +2226,13 @@ static struct bt_config *bt_config_convert_create(
                goto error;
        }
 
+       cfg->cmd_data.convert.filters = g_ptr_array_new_with_free_func(
+               (GDestroyNotify) bt_put);
+       if (!cfg->cmd_data.convert.filters) {
+               print_err_oom();
+               goto error;
+       }
+
        cfg->cmd_data.convert.sinks = g_ptr_array_new_with_free_func(
                (GDestroyNotify) bt_put);
        if (!cfg->cmd_data.convert.sinks) {
@@ -2198,6 +2240,13 @@ static struct bt_config *bt_config_convert_create(
                goto error;
        }
 
+       cfg->cmd_data.convert.connections = g_ptr_array_new_with_free_func(
+               (GDestroyNotify) bt_config_connection_destroy);
+       if (!cfg->cmd_data.convert.connections) {
+               print_err_oom();
+               goto error;
+       }
+
        if (initial_plugin_paths) {
                cfg->cmd_data.convert.plugin_paths =
                        bt_get(initial_plugin_paths);
@@ -2251,42 +2300,174 @@ end:
        return cfg;
 }
 
+static struct bt_config *bt_config_help_create(
+               struct bt_value *initial_plugin_paths)
+{
+       struct bt_config *cfg;
+
+       /* Create config */
+       cfg = bt_config_base_create(BT_CONFIG_COMMAND_HELP);
+       if (!cfg) {
+               print_err_oom();
+               goto error;
+       }
+
+       if (initial_plugin_paths) {
+               cfg->cmd_data.help.plugin_paths =
+                       bt_get(initial_plugin_paths);
+       } else {
+               cfg->cmd_data.help.plugin_paths =
+                       bt_value_array_create();
+               if (!cfg->cmd_data.help.plugin_paths) {
+                       print_err_oom();
+                       goto error;
+               }
+       }
+
+       cfg->cmd_data.help.cfg_component =
+               bt_config_component_create(BT_COMPONENT_CLASS_TYPE_UNKNOWN,
+                       NULL, NULL);
+       if (!cfg->cmd_data.help.cfg_component) {
+               print_err_oom();
+               goto error;
+       }
+
+       goto end;
+
+error:
+       BT_PUT(cfg);
+
+end:
+       return cfg;
+}
+
+static struct bt_config *bt_config_query_info_create(
+               struct bt_value *initial_plugin_paths)
+{
+       struct bt_config *cfg;
+
+       /* Create config */
+       cfg = bt_config_base_create(BT_CONFIG_COMMAND_QUERY_INFO);
+       if (!cfg) {
+               print_err_oom();
+               goto error;
+       }
+
+       if (initial_plugin_paths) {
+               cfg->cmd_data.query_info.plugin_paths =
+                       bt_get(initial_plugin_paths);
+       } else {
+               cfg->cmd_data.query_info.plugin_paths =
+                       bt_value_array_create();
+               if (!cfg->cmd_data.query_info.plugin_paths) {
+                       print_err_oom();
+                       goto error;
+               }
+       }
+
+       cfg->cmd_data.query_info.action = g_string_new(NULL);
+       if (!cfg->cmd_data.query_info.action) {
+               print_err_oom();
+               goto error;
+       }
+
+       goto end;
+
+error:
+       BT_PUT(cfg);
+
+end:
+       return cfg;
+}
+
 /*
- * Prints the list-plugins command usage.
+ * Prints the expected format for a --params option.
  */
 static
-void print_list_plugins_usage(FILE *fp)
+void print_expected_params_format(FILE *fp)
 {
-       fprintf(fp, "Usage: babeltrace [GENERAL OPTIONS] list-plugins [OPTIONS]\n");
+       fprintf(fp, "Expected format of PARAMS\n");
+       fprintf(fp, "-------------------------\n");
+       fprintf(fp, "\n");
+       fprintf(fp, "    PARAM=VALUE[,PARAM=VALUE]...\n");
+       fprintf(fp, "\n");
+       fprintf(fp, "The parameter string is a comma-separated list of PARAM=VALUE assignments,\n");
+       fprintf(fp, "where PARAM is the parameter name (C identifier plus [:.-] characters), and\n");
+       fprintf(fp, "VALUE can be one of:\n");
+       fprintf(fp, "\n");
+       fprintf(fp, "* `null`, `nul`, `NULL`: null value (no backticks).\n");
+       fprintf(fp, "* `true`, `TRUE`, `yes`, `YES`: true boolean value (no backticks).\n");
+       fprintf(fp, "* `false`, `FALSE`, `no`, `NO`: false boolean value (no backticks).\n");
+       fprintf(fp, "* Binary (`0b` prefix), octal (`0` prefix), decimal, or hexadecimal\n");
+       fprintf(fp, "  (`0x` prefix) signed 64-bit integer.\n");
+       fprintf(fp, "* Double precision floating point number (scientific notation is accepted).\n");
+       fprintf(fp, "* Unquoted string with no special characters, and not matching any of\n");
+       fprintf(fp, "  the null and boolean value symbols above.\n");
+       fprintf(fp, "* Double-quoted string (accepts escape characters).\n");
+       fprintf(fp, "\n");
+       fprintf(fp, "Whitespaces are allowed around individual `=` and `,` tokens.\n");
+       fprintf(fp, "\n");
+       fprintf(fp, "Example:\n");
+       fprintf(fp, "\n");
+       fprintf(fp, "    many=null, fresh=yes, condition=false, squirrel=-782329,\n");
+       fprintf(fp, "    observe=3.14, simple=beef, needs-quotes=\"some string\",\n");
+       fprintf(fp, "    escape.chars-are:allowed=\"this is a \\\" double quote\"\n");
+       fprintf(fp, "\n");
+       fprintf(fp, "IMPORTANT: Make sure to single-quote the whole argument when you run babeltrace\n");
+       fprintf(fp, "from a shell.\n");
+}
+
+
+/*
+ * Prints the help command usage.
+ */
+static
+void print_help_usage(FILE *fp)
+{
+       fprintf(fp, "Usage: babeltrace [GENERAL OPTIONS] help [OPTIONS] PLUGIN\n");
+       fprintf(fp, "       babeltrace [GENERAL OPTIONS] help [OPTIONS] --source=PLUGIN.COMPCLS\n");
+       fprintf(fp, "       babeltrace [GENERAL OPTIONS] help [OPTIONS] --filter=PLUGIN.COMPCLS\n");
+       fprintf(fp, "       babeltrace [GENERAL OPTIONS] help [OPTIONS] --sink=PLUGIN.COMPCLS\n");
        fprintf(fp, "\n");
        fprintf(fp, "Options:\n");
        fprintf(fp, "\n");
+       fprintf(fp, "      --filter=PLUGIN.COMPCLS       Get help for the filter component class\n");
+       fprintf(fp, "                                    COMPCLS found in the plugin PLUGIN\n");
        fprintf(fp, "      --omit-home-plugin-path       Omit home plugins from plugin search path\n");
        fprintf(fp, "                                    (~/.local/lib/babeltrace/plugins)\n");
        fprintf(fp, "      --omit-system-plugin-path     Omit system plugins from plugin search path\n");
        fprintf(fp, "      --plugin-path=PATH[:PATH]...  Add PATH to the list of paths from which\n");
        fprintf(fp, "                                    dynamic plugins can be loaded\n");
+       fprintf(fp, "      --sink=PLUGIN.COMPCLS         Get help for the sink component class\n");
+       fprintf(fp, "                                    COMPCLS found in the plugin PLUGIN\n");
+       fprintf(fp, "      --source=PLUGIN.COMPCLS       Get help for the source component class\n");
+       fprintf(fp, "                                    COMPCLS found in the plugin PLUGIN\n");
        fprintf(fp, "  -h  --help                        Show this help and quit\n");
        fprintf(fp, "\n");
        fprintf(fp, "See `babeltrace --help` for the list of general options.\n");
+       fprintf(fp, "\n");
+       fprintf(fp, "Use `babeltrace list-plugins` to show the list of available plugins.\n");
 }
 
-static struct poptOption list_plugins_long_options[] = {
+static struct poptOption help_long_options[] = {
        /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
+       { "filter", '\0', POPT_ARG_STRING, NULL, OPT_FILTER, NULL, NULL },
        { "help", 'h', POPT_ARG_NONE, NULL, OPT_HELP, NULL, NULL },
        { "omit-home-plugin-path", '\0', POPT_ARG_NONE, NULL, OPT_OMIT_HOME_PLUGIN_PATH, NULL, NULL },
        { "omit-system-plugin-path", '\0', POPT_ARG_NONE, NULL, OPT_OMIT_SYSTEM_PLUGIN_PATH, NULL, NULL },
        { "plugin-path", '\0', POPT_ARG_STRING, NULL, OPT_PLUGIN_PATH, NULL, NULL },
+       { "sink", '\0', POPT_ARG_STRING, NULL, OPT_SINK, NULL, NULL },
+       { "source", '\0', POPT_ARG_STRING, NULL, OPT_SOURCE, NULL, NULL },
        { NULL, 0, 0, NULL, 0, NULL, NULL },
 };
 
 /*
- * Creates a Babeltrace config object from the arguments of a
- * list-plugins command.
+ * Creates a Babeltrace config object from the arguments of a help
+ * command.
  *
  * *retcode is set to the appropriate exit code to use.
  */
-struct bt_config *bt_config_list_plugins_from_args(int argc, const char *argv[],
+struct bt_config *bt_config_help_from_args(int argc, const char *argv[],
                int *retcode, bool omit_system_plugin_path,
                bool omit_home_plugin_path,
                struct bt_value *initial_plugin_paths)
@@ -2297,18 +2478,19 @@ struct bt_config *bt_config_list_plugins_from_args(int argc, const char *argv[],
        int ret;
        struct bt_config *cfg = NULL;
        const char *leftover;
+       char *plugin_name = NULL, *component_name = NULL;
+       char *plugin_comp_cls_names = NULL;
 
        *retcode = 0;
-       cfg = bt_config_list_plugins_create(initial_plugin_paths);
+       cfg = bt_config_help_create(initial_plugin_paths);
        if (!cfg) {
                print_err_oom();
                goto error;
        }
 
-       cfg->cmd_data.list_plugins.omit_system_plugin_path = omit_system_plugin_path;
-       cfg->cmd_data.list_plugins.omit_home_plugin_path = omit_home_plugin_path;
-       ret = append_env_var_plugin_paths(
-               cfg->cmd_data.list_plugins.plugin_paths);
+       cfg->cmd_data.help.omit_system_plugin_path = omit_system_plugin_path;
+       cfg->cmd_data.help.omit_home_plugin_path = omit_home_plugin_path;
+       ret = append_env_var_plugin_paths(cfg->cmd_data.help.plugin_paths);
        if (ret) {
                printf_err("Cannot append plugin paths from BABELTRACE_PLUGIN_PATH\n");
                goto error;
@@ -2316,7 +2498,7 @@ struct bt_config *bt_config_list_plugins_from_args(int argc, const char *argv[],
 
        /* Parse options */
        pc = poptGetContext(NULL, argc, (const char **) argv,
-               list_plugins_long_options, 0);
+               help_long_options, 0);
        if (!pc) {
                printf_err("Cannot get popt context\n");
                goto error;
@@ -2333,7 +2515,7 @@ struct bt_config *bt_config_list_plugins_from_args(int argc, const char *argv[],
                                printf_debug("Skipping non-system plugin paths for setuid/setgid binary\n");
                        } else {
                                if (bt_config_append_plugin_paths(
-                                               cfg->cmd_data.list_plugins.plugin_paths,
+                                               cfg->cmd_data.help.plugin_paths,
                                                arg)) {
                                        printf_err("Invalid --plugin-path option's argument:\n    %s\n",
                                                arg);
@@ -2342,13 +2524,45 @@ struct bt_config *bt_config_list_plugins_from_args(int argc, const char *argv[],
                        }
                        break;
                case OPT_OMIT_SYSTEM_PLUGIN_PATH:
-                       cfg->cmd_data.list_plugins.omit_system_plugin_path = true;
+                       cfg->cmd_data.help.omit_system_plugin_path = true;
                        break;
                case OPT_OMIT_HOME_PLUGIN_PATH:
-                       cfg->cmd_data.list_plugins.omit_home_plugin_path = true;
+                       cfg->cmd_data.help.omit_home_plugin_path = true;
+                       break;
+               case OPT_SOURCE:
+               case OPT_FILTER:
+               case OPT_SINK:
+                       if (cfg->cmd_data.help.cfg_component->type !=
+                                       BT_COMPONENT_CLASS_TYPE_UNKNOWN) {
+                               printf_err("Cannot specify more than one plugin and component class:\n    %s\n",
+                                       arg);
+                               goto error;
+                       }
+
+                       switch (opt) {
+                       case OPT_SOURCE:
+                               cfg->cmd_data.help.cfg_component->type =
+                                       BT_COMPONENT_CLASS_TYPE_SOURCE;
+                               break;
+                       case OPT_FILTER:
+                               cfg->cmd_data.help.cfg_component->type =
+                                       BT_COMPONENT_CLASS_TYPE_FILTER;
+                               break;
+                       case OPT_SINK:
+                               cfg->cmd_data.help.cfg_component->type =
+                                       BT_COMPONENT_CLASS_TYPE_SINK;
+                               break;
+                       default:
+                               assert(false);
+                       }
+                       plugin_comp_cls_names = strdup(arg);
+                       if (!plugin_comp_cls_names) {
+                               print_err_oom();
+                               goto error;
+                       }
                        break;
                case OPT_HELP:
-                       print_list_plugins_usage(stdout);
+                       print_help_usage(stdout);
                        *retcode = -1;
                        BT_PUT(cfg);
                        goto end;
@@ -2371,14 +2585,42 @@ struct bt_config *bt_config_list_plugins_from_args(int argc, const char *argv[],
 
        leftover = poptGetArg(pc);
        if (leftover) {
-               printf_err("Invalid argument: %s\n", leftover);
-               goto error;
+               if (cfg->cmd_data.help.cfg_component->type !=
+                                       BT_COMPONENT_CLASS_TYPE_UNKNOWN) {
+                       printf_err("Cannot specify plugin name and --source/--filter/--sink component class:\n    %s\n",
+                               leftover);
+                       goto error;
+               }
+
+               g_string_assign(cfg->cmd_data.help.cfg_component->plugin_name,
+                       leftover);
+       } else {
+               if (cfg->cmd_data.help.cfg_component->type ==
+                                       BT_COMPONENT_CLASS_TYPE_UNKNOWN) {
+                       print_help_usage(stdout);
+                       *retcode = -1;
+                       BT_PUT(cfg);
+                       goto end;
+               }
+
+               plugin_component_names_from_arg(plugin_comp_cls_names,
+                       &plugin_name, &component_name);
+               if (plugin_name && component_name) {
+                       g_string_assign(cfg->cmd_data.help.cfg_component->plugin_name,
+                               plugin_name);
+                       g_string_assign(cfg->cmd_data.help.cfg_component->component_name,
+                               component_name);
+               } else {
+                       printf_err("Invalid --source/--filter/--sink option's argument:\n    %s\n",
+                               plugin_comp_cls_names);
+                       goto error;
+               }
        }
 
        if (append_home_and_system_plugin_paths(
-                       cfg->cmd_data.list_plugins.plugin_paths,
-                       cfg->cmd_data.list_plugins.omit_system_plugin_path,
-                       cfg->cmd_data.list_plugins.omit_home_plugin_path)) {
+                       cfg->cmd_data.help.plugin_paths,
+                       cfg->cmd_data.help.omit_system_plugin_path,
+                       cfg->cmd_data.help.omit_home_plugin_path)) {
                printf_err("Cannot append home and system plugin paths\n");
                goto error;
        }
@@ -2390,6 +2632,10 @@ error:
        BT_PUT(cfg);
 
 end:
+       free(plugin_comp_cls_names);
+       g_free(plugin_name);
+       g_free(component_name);
+
        if (pc) {
                poptFreeContext(pc);
        }
@@ -2398,88 +2644,481 @@ end:
        return cfg;
 }
 
-
-/*
- * Prints the legacy, Babeltrace 1.x command usage. Those options are
- * still compatible in Babeltrace 2.x, but it is recommended to use
- * the more generic plugin/component parameters instead of those
- * hard-coded option names.
- */
-static
-void print_legacy_usage(FILE *fp)
-{
-       fprintf(fp, "Usage: babeltrace [OPTIONS] INPUT...\n");
-       fprintf(fp, "\n");
-       fprintf(fp, "The following options are compatible with the Babeltrace 1.x options:\n");
-       fprintf(fp, "\n");
-       fprintf(fp, "      --clock-force-correlate  Assume that clocks are inherently correlated\n");
-       fprintf(fp, "                               across traces\n");
-       fprintf(fp, "  -d, --debug                  Enable debug mode\n");
-       fprintf(fp, "  -i, --input-format=FORMAT    Input trace format (default: ctf)\n");
-       fprintf(fp, "  -l, --list                   List available formats\n");
-       fprintf(fp, "  -o, --output-format=FORMAT   Output trace format (default: text)\n");
-       fprintf(fp, "  -v, --verbose                Enable verbose output\n");
-       fprintf(fp, "      --help-legacy            Show this help and quit\n");
-       fprintf(fp, "  -V, --version                Show version and quit\n");
-       fprintf(fp, "\n");
-       fprintf(fp, "  Available input formats:  ctf, lttng-live, ctf-metadata\n");
-       fprintf(fp, "  Available output formats: text, dummy\n");
-       fprintf(fp, "\n");
-       fprintf(fp, "Input formats specific options:\n");
-       fprintf(fp, "\n");
-       fprintf(fp, "  INPUT...                     Input trace file(s), directory(ies), or URLs\n");
-       fprintf(fp, "      --clock-offset=SEC       Set clock offset to SEC seconds\n");
-       fprintf(fp, "      --clock-offset-ns=NS     Set clock offset to NS nanoseconds\n");
-       fprintf(fp, "      --stream-intersection    Only process events when all streams are active\n");
-       fprintf(fp, "\n");
-       fprintf(fp, "text output format specific options:\n");
-       fprintf(fp, "  \n");
-       fprintf(fp, "      --clock-cycles           Print timestamps in clock cycles\n");
-       fprintf(fp, "      --clock-date             Print timestamp dates\n");
-       fprintf(fp, "      --clock-gmt              Print and parse timestamps in GMT time zone\n");
-       fprintf(fp, "                               (default: local time zone)\n");
-       fprintf(fp, "      --clock-seconds          Print the timestamps as [SEC.NS]\n");
-       fprintf(fp, "                               (default format: [HH:MM:SS.NS])\n");
-       fprintf(fp, "      --debug-info-dir=DIR     Search for debug info in directory DIR\n");
-       fprintf(fp, "                               (default: `/usr/lib/debug`)\n");
-       fprintf(fp, "      --debug-info-full-path   Show full debug info source and binary paths\n");
-       fprintf(fp, "      --debug-info-target-prefix=DIR  Use directory DIR as a prefix when looking\n");
-       fprintf(fp, "                                      up executables during debug info analysis\n");
-       fprintf(fp, "                               (default: `/usr/lib/debug`)\n");
-       fprintf(fp, "  -f, --fields=NAME[,NAME]...  Print additional fields:\n");
-       fprintf(fp, "                                 all, trace, trace:hostname, trace:domain,\n");
-       fprintf(fp, "                                 trace:procname, trace:vpid, loglevel, emf\n");
-       fprintf(fp, "                                 (default: trace:hostname, trace:procname,\n");
-       fprintf(fp, "                                           trace:vpid)\n");
-       fprintf(fp, "  -n, --names=NAME[,NAME]...   Print field names:\n");
-       fprintf(fp, "                                 payload (or arg or args)\n");
-       fprintf(fp, "                                 none, all, scope, header, context (or ctx)\n");
-       fprintf(fp, "                                 (default: payload, context)\n");
-       fprintf(fp, "      --no-delta               Do not print time delta between consecutive\n");
-       fprintf(fp, "                               events\n");
-       fprintf(fp, "  -w, --output=PATH            Write output to PATH (default: standard output)\n");
-}
-
 /*
- * Prints the convert command usage.
+ * Prints the help command usage.
  */
 static
-void print_convert_usage(FILE *fp)
+void print_query_info_usage(FILE *fp)
 {
-       fprintf(fp, "Usage: babeltrace [GENERAL OPTIONS] convert [OPTIONS]\n");
+       fprintf(fp, "Usage: babeltrace [GEN OPTS] query-info [OPTS] ACTION --source=PLUGIN.COMPCLS\n");
+       fprintf(fp, "       babeltrace [GEN OPTS] query-info [OPTS] ACTION --filter=PLUGIN.COMPCLS\n");
+       fprintf(fp, "       babeltrace [GEN OPTS] query-info [OPTS] ACTION --sink=PLUGIN.COMPCLS\n");
        fprintf(fp, "\n");
        fprintf(fp, "Options:\n");
        fprintf(fp, "\n");
-       fprintf(fp, "  -b, --base-params=PARAMS          Set PARAMS as the current base parameters\n");
-       fprintf(fp, "                                    for the following component instances\n");
+       fprintf(fp, "      --filter=PLUGIN.COMPCLS       Query info from the filter component class\n");
+       fprintf(fp, "                                    COMPCLS found in the plugin PLUGIN\n");
+       fprintf(fp, "      --omit-home-plugin-path       Omit home plugins from plugin search path\n");
+       fprintf(fp, "                                    (~/.local/lib/babeltrace/plugins)\n");
+       fprintf(fp, "      --omit-system-plugin-path     Omit system plugins from plugin search path\n");
+       fprintf(fp, "  -p, --params=PARAMS               Set the query parameters to PARAMS\n");
        fprintf(fp, "                                    (see the expected format of PARAMS below)\n");
-       fprintf(fp, "      --begin=BEGIN                 Set the `begin` parameter of the latest\n");
+       fprintf(fp, "      --plugin-path=PATH[:PATH]...  Add PATH to the list of paths from which\n");
+       fprintf(fp, "                                    dynamic plugins can be loaded\n");
+       fprintf(fp, "      --sink=PLUGIN.COMPCLS         Query info from the sink component class\n");
+       fprintf(fp, "                                    COMPCLS found in the plugin PLUGIN\n");
+       fprintf(fp, "      --source=PLUGIN.COMPCLS       Query info from the source component class\n");
+       fprintf(fp, "                                    COMPCLS found in the plugin PLUGIN\n");
+       fprintf(fp, "  -h  --help                        Show this help and quit\n");
+       fprintf(fp, "\n\n");
+       print_expected_params_format(fp);
+}
+
+static struct poptOption query_info_long_options[] = {
+       /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
+       { "filter", '\0', POPT_ARG_STRING, NULL, OPT_FILTER, NULL, NULL },
+       { "help", 'h', POPT_ARG_NONE, NULL, OPT_HELP, NULL, NULL },
+       { "omit-home-plugin-path", '\0', POPT_ARG_NONE, NULL, OPT_OMIT_HOME_PLUGIN_PATH, NULL, NULL },
+       { "omit-system-plugin-path", '\0', POPT_ARG_NONE, NULL, OPT_OMIT_SYSTEM_PLUGIN_PATH, NULL, NULL },
+       { "params", 'p', POPT_ARG_STRING, NULL, OPT_PARAMS, NULL, NULL },
+       { "plugin-path", '\0', POPT_ARG_STRING, NULL, OPT_PLUGIN_PATH, NULL, NULL },
+       { "sink", '\0', POPT_ARG_STRING, NULL, OPT_SINK, NULL, NULL },
+       { "source", '\0', POPT_ARG_STRING, NULL, OPT_SOURCE, NULL, NULL },
+       { NULL, 0, 0, NULL, 0, NULL, NULL },
+};
+
+/*
+ * Creates a Babeltrace config object from the arguments of a query-info
+ * command.
+ *
+ * *retcode is set to the appropriate exit code to use.
+ */
+struct bt_config *bt_config_query_info_from_args(int argc, const char *argv[],
+               int *retcode, bool omit_system_plugin_path,
+               bool omit_home_plugin_path,
+               struct bt_value *initial_plugin_paths)
+{
+       poptContext pc = NULL;
+       char *arg = NULL;
+       int opt;
+       int ret;
+       struct bt_config *cfg = NULL;
+       const char *leftover;
+       struct bt_value *params = bt_value_null;
+
+       *retcode = 0;
+       cfg = bt_config_query_info_create(initial_plugin_paths);
+       if (!cfg) {
+               print_err_oom();
+               goto error;
+       }
+
+       cfg->cmd_data.query_info.omit_system_plugin_path =
+               omit_system_plugin_path;
+       cfg->cmd_data.query_info.omit_home_plugin_path = omit_home_plugin_path;
+       ret = append_env_var_plugin_paths(cfg->cmd_data.query_info.plugin_paths);
+       if (ret) {
+               printf_err("Cannot append plugin paths from BABELTRACE_PLUGIN_PATH\n");
+               goto error;
+       }
+
+       /* Parse options */
+       pc = poptGetContext(NULL, argc, (const char **) argv,
+               query_info_long_options, 0);
+       if (!pc) {
+               printf_err("Cannot get popt context\n");
+               goto error;
+       }
+
+       poptReadDefaultConfig(pc, 0);
+
+       while ((opt = poptGetNextOpt(pc)) > 0) {
+               arg = poptGetOptArg(pc);
+
+               switch (opt) {
+               case OPT_PLUGIN_PATH:
+                       if (bt_common_is_setuid_setgid()) {
+                               printf_debug("Skipping non-system plugin paths for setuid/setgid binary\n");
+                       } else {
+                               if (bt_config_append_plugin_paths(
+                                               cfg->cmd_data.query_info.plugin_paths,
+                                               arg)) {
+                                       printf_err("Invalid --plugin-path option's argument:\n    %s\n",
+                                               arg);
+                                       goto error;
+                               }
+                       }
+                       break;
+               case OPT_OMIT_SYSTEM_PLUGIN_PATH:
+                       cfg->cmd_data.query_info.omit_system_plugin_path = true;
+                       break;
+               case OPT_OMIT_HOME_PLUGIN_PATH:
+                       cfg->cmd_data.query_info.omit_home_plugin_path = true;
+                       break;
+               case OPT_SOURCE:
+               case OPT_FILTER:
+               case OPT_SINK:
+               {
+                       enum bt_component_class_type type;
+
+                       if (cfg->cmd_data.query_info.cfg_component) {
+                               printf_err("Cannot specify more than one plugin and component class:\n    %s\n",
+                                       arg);
+                               goto error;
+                       }
+
+                       switch (opt) {
+                       case OPT_SOURCE:
+                               type = BT_COMPONENT_CLASS_TYPE_SOURCE;
+                               break;
+                       case OPT_FILTER:
+                               type = BT_COMPONENT_CLASS_TYPE_FILTER;
+                               break;
+                       case OPT_SINK:
+                               type = BT_COMPONENT_CLASS_TYPE_SINK;
+                               break;
+                       default:
+                               assert(false);
+                       }
+
+                       cfg->cmd_data.query_info.cfg_component =
+                               bt_config_component_from_arg(type, arg);
+                       if (!cfg->cmd_data.query_info.cfg_component) {
+                               printf_err("Invalid format for --source/--filter/--sink option's argument:\n    %s\n",
+                                       arg);
+                               goto error;
+                       }
+
+                       /* Default parameters: null */
+                       bt_put(cfg->cmd_data.query_info.cfg_component->params);
+                       cfg->cmd_data.query_info.cfg_component->params =
+                               bt_value_null;
+                       break;
+               }
+               case OPT_PARAMS:
+               {
+                       params = bt_value_from_arg(arg);
+                       if (!params) {
+                               printf_err("Invalid format for --params option's argument:\n    %s\n",
+                                       arg);
+                               goto error;
+                       }
+                       break;
+               }
+               case OPT_HELP:
+                       print_query_info_usage(stdout);
+                       *retcode = -1;
+                       BT_PUT(cfg);
+                       goto end;
+               default:
+                       printf_err("Unknown command-line option specified (option code %d)\n",
+                               opt);
+                       goto error;
+               }
+
+               free(arg);
+               arg = NULL;
+       }
+
+       if (!cfg->cmd_data.query_info.cfg_component) {
+               printf_err("No target component class specified with --source/--filter/--sink option\n");
+               goto error;
+       }
+
+       assert(params);
+       BT_MOVE(cfg->cmd_data.query_info.cfg_component->params, params);
+
+       /* Check for option parsing error */
+       if (opt < -1) {
+               printf_err("While parsing command-line options, at option %s: %s\n",
+                       poptBadOption(pc, 0), poptStrerror(opt));
+               goto error;
+       }
+
+       /*
+        * We need exactly one leftover argument which is the
+        * mandatory action.
+        */
+       leftover = poptGetArg(pc);
+       if (leftover) {
+               if (strlen(leftover) == 0) {
+                       printf_err("Invalid empty action\n");
+                       goto error;
+               }
+
+               g_string_assign(cfg->cmd_data.query_info.action, leftover);
+       } else {
+               print_query_info_usage(stdout);
+               *retcode = -1;
+               BT_PUT(cfg);
+               goto end;
+       }
+
+       leftover = poptGetArg(pc);
+       if (leftover) {
+               printf_err("Invalid argument: %s\n", leftover);
+               goto error;
+       }
+
+       if (append_home_and_system_plugin_paths(
+                       cfg->cmd_data.query_info.plugin_paths,
+                       cfg->cmd_data.query_info.omit_system_plugin_path,
+                       cfg->cmd_data.query_info.omit_home_plugin_path)) {
+               printf_err("Cannot append home and system plugin paths\n");
+               goto error;
+       }
+
+       goto end;
+
+error:
+       *retcode = 1;
+       BT_PUT(cfg);
+
+end:
+       if (pc) {
+               poptFreeContext(pc);
+       }
+
+       BT_PUT(params);
+       free(arg);
+       return cfg;
+}
+
+/*
+ * Prints the list-plugins command usage.
+ */
+static
+void print_list_plugins_usage(FILE *fp)
+{
+       fprintf(fp, "Usage: babeltrace [GENERAL OPTIONS] list-plugins [OPTIONS]\n");
+       fprintf(fp, "\n");
+       fprintf(fp, "Options:\n");
+       fprintf(fp, "\n");
+       fprintf(fp, "      --omit-home-plugin-path       Omit home plugins from plugin search path\n");
+       fprintf(fp, "                                    (~/.local/lib/babeltrace/plugins)\n");
+       fprintf(fp, "      --omit-system-plugin-path     Omit system plugins from plugin search path\n");
+       fprintf(fp, "      --plugin-path=PATH[:PATH]...  Add PATH to the list of paths from which\n");
+       fprintf(fp, "                                    dynamic plugins can be loaded\n");
+       fprintf(fp, "  -h  --help                        Show this help and quit\n");
+       fprintf(fp, "\n");
+       fprintf(fp, "See `babeltrace --help` for the list of general options.\n");
+       fprintf(fp, "\n");
+       fprintf(fp, "Use `babeltrace help` to get help for a specific plugin or component class.\n");
+}
+
+static struct poptOption list_plugins_long_options[] = {
+       /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
+       { "help", 'h', POPT_ARG_NONE, NULL, OPT_HELP, NULL, NULL },
+       { "omit-home-plugin-path", '\0', POPT_ARG_NONE, NULL, OPT_OMIT_HOME_PLUGIN_PATH, NULL, NULL },
+       { "omit-system-plugin-path", '\0', POPT_ARG_NONE, NULL, OPT_OMIT_SYSTEM_PLUGIN_PATH, NULL, NULL },
+       { "plugin-path", '\0', POPT_ARG_STRING, NULL, OPT_PLUGIN_PATH, NULL, NULL },
+       { NULL, 0, 0, NULL, 0, NULL, NULL },
+};
+
+/*
+ * Creates a Babeltrace config object from the arguments of a
+ * list-plugins command.
+ *
+ * *retcode is set to the appropriate exit code to use.
+ */
+struct bt_config *bt_config_list_plugins_from_args(int argc, const char *argv[],
+               int *retcode, bool omit_system_plugin_path,
+               bool omit_home_plugin_path,
+               struct bt_value *initial_plugin_paths)
+{
+       poptContext pc = NULL;
+       char *arg = NULL;
+       int opt;
+       int ret;
+       struct bt_config *cfg = NULL;
+       const char *leftover;
+
+       *retcode = 0;
+       cfg = bt_config_list_plugins_create(initial_plugin_paths);
+       if (!cfg) {
+               print_err_oom();
+               goto error;
+       }
+
+       cfg->cmd_data.list_plugins.omit_system_plugin_path = omit_system_plugin_path;
+       cfg->cmd_data.list_plugins.omit_home_plugin_path = omit_home_plugin_path;
+       ret = append_env_var_plugin_paths(
+               cfg->cmd_data.list_plugins.plugin_paths);
+       if (ret) {
+               printf_err("Cannot append plugin paths from BABELTRACE_PLUGIN_PATH\n");
+               goto error;
+       }
+
+       /* Parse options */
+       pc = poptGetContext(NULL, argc, (const char **) argv,
+               list_plugins_long_options, 0);
+       if (!pc) {
+               printf_err("Cannot get popt context\n");
+               goto error;
+       }
+
+       poptReadDefaultConfig(pc, 0);
+
+       while ((opt = poptGetNextOpt(pc)) > 0) {
+               arg = poptGetOptArg(pc);
+
+               switch (opt) {
+               case OPT_PLUGIN_PATH:
+                       if (bt_common_is_setuid_setgid()) {
+                               printf_debug("Skipping non-system plugin paths for setuid/setgid binary\n");
+                       } else {
+                               if (bt_config_append_plugin_paths(
+                                               cfg->cmd_data.list_plugins.plugin_paths,
+                                               arg)) {
+                                       printf_err("Invalid --plugin-path option's argument:\n    %s\n",
+                                               arg);
+                                       goto error;
+                               }
+                       }
+                       break;
+               case OPT_OMIT_SYSTEM_PLUGIN_PATH:
+                       cfg->cmd_data.list_plugins.omit_system_plugin_path = true;
+                       break;
+               case OPT_OMIT_HOME_PLUGIN_PATH:
+                       cfg->cmd_data.list_plugins.omit_home_plugin_path = true;
+                       break;
+               case OPT_HELP:
+                       print_list_plugins_usage(stdout);
+                       *retcode = -1;
+                       BT_PUT(cfg);
+                       goto end;
+               default:
+                       printf_err("Unknown command-line option specified (option code %d)\n",
+                               opt);
+                       goto error;
+               }
+
+               free(arg);
+               arg = NULL;
+       }
+
+       /* Check for option parsing error */
+       if (opt < -1) {
+               printf_err("While parsing command-line options, at option %s: %s\n",
+                       poptBadOption(pc, 0), poptStrerror(opt));
+               goto error;
+       }
+
+       leftover = poptGetArg(pc);
+       if (leftover) {
+               printf_err("Invalid argument: %s\n", leftover);
+               goto error;
+       }
+
+       if (append_home_and_system_plugin_paths(
+                       cfg->cmd_data.list_plugins.plugin_paths,
+                       cfg->cmd_data.list_plugins.omit_system_plugin_path,
+                       cfg->cmd_data.list_plugins.omit_home_plugin_path)) {
+               printf_err("Cannot append home and system plugin paths\n");
+               goto error;
+       }
+
+       goto end;
+
+error:
+       *retcode = 1;
+       BT_PUT(cfg);
+
+end:
+       if (pc) {
+               poptFreeContext(pc);
+       }
+
+       free(arg);
+       return cfg;
+}
+
+/*
+ * Prints the legacy, Babeltrace 1.x command usage. Those options are
+ * still compatible in Babeltrace 2.x, but it is recommended to use
+ * the more generic plugin/component parameters instead of those
+ * hard-coded option names.
+ */
+static
+void print_legacy_usage(FILE *fp)
+{
+       fprintf(fp, "Usage: babeltrace [OPTIONS] INPUT...\n");
+       fprintf(fp, "\n");
+       fprintf(fp, "The following options are compatible with the Babeltrace 1.x options:\n");
+       fprintf(fp, "\n");
+       fprintf(fp, "      --clock-force-correlate  Assume that clocks are inherently correlated\n");
+       fprintf(fp, "                               across traces\n");
+       fprintf(fp, "  -d, --debug                  Enable debug mode\n");
+       fprintf(fp, "  -i, --input-format=FORMAT    Input trace format (default: ctf)\n");
+       fprintf(fp, "  -l, --list                   List available formats\n");
+       fprintf(fp, "  -o, --output-format=FORMAT   Output trace format (default: text)\n");
+       fprintf(fp, "  -v, --verbose                Enable verbose output\n");
+       fprintf(fp, "      --help-legacy            Show this help and quit\n");
+       fprintf(fp, "  -V, --version                Show version and quit\n");
+       fprintf(fp, "\n");
+       fprintf(fp, "  Available input formats:  ctf, lttng-live, ctf-metadata\n");
+       fprintf(fp, "  Available output formats: text, dummy\n");
+       fprintf(fp, "\n");
+       fprintf(fp, "Input formats specific options:\n");
+       fprintf(fp, "\n");
+       fprintf(fp, "  INPUT...                     Input trace file(s), directory(ies), or URLs\n");
+       fprintf(fp, "      --clock-offset=SEC       Set clock offset to SEC seconds\n");
+       fprintf(fp, "      --clock-offset-ns=NS     Set clock offset to NS nanoseconds\n");
+       fprintf(fp, "      --stream-intersection    Only process events when all streams are active\n");
+       fprintf(fp, "\n");
+       fprintf(fp, "text output format specific options:\n");
+       fprintf(fp, "  \n");
+       fprintf(fp, "      --clock-cycles           Print timestamps in clock cycles\n");
+       fprintf(fp, "      --clock-date             Print timestamp dates\n");
+       fprintf(fp, "      --clock-gmt              Print and parse timestamps in GMT time zone\n");
+       fprintf(fp, "                               (default: local time zone)\n");
+       fprintf(fp, "      --clock-seconds          Print the timestamps as [SEC.NS]\n");
+       fprintf(fp, "                               (default format: [HH:MM:SS.NS])\n");
+       fprintf(fp, "      --debug-info-dir=DIR     Search for debug info in directory DIR\n");
+       fprintf(fp, "                               (default: `/usr/lib/debug`)\n");
+       fprintf(fp, "      --debug-info-full-path   Show full debug info source and binary paths\n");
+       fprintf(fp, "      --debug-info-target-prefix=DIR  Use directory DIR as a prefix when looking\n");
+       fprintf(fp, "                                      up executables during debug info analysis\n");
+       fprintf(fp, "                               (default: `/usr/lib/debug`)\n");
+       fprintf(fp, "  -f, --fields=NAME[,NAME]...  Print additional fields:\n");
+       fprintf(fp, "                                 all, trace, trace:hostname, trace:domain,\n");
+       fprintf(fp, "                                 trace:procname, trace:vpid, loglevel, emf\n");
+       fprintf(fp, "                                 (default: trace:hostname, trace:procname,\n");
+       fprintf(fp, "                                           trace:vpid)\n");
+       fprintf(fp, "  -n, --names=NAME[,NAME]...   Print field names:\n");
+       fprintf(fp, "                                 payload (or arg or args)\n");
+       fprintf(fp, "                                 none, all, scope, header, context (or ctx)\n");
+       fprintf(fp, "                                 (default: payload, context)\n");
+       fprintf(fp, "      --no-delta               Do not print time delta between consecutive\n");
+       fprintf(fp, "                               events\n");
+       fprintf(fp, "  -w, --output=PATH            Write output to PATH (default: standard output)\n");
+}
+
+/*
+ * Prints the convert command usage.
+ */
+static
+void print_convert_usage(FILE *fp)
+{
+       fprintf(fp, "Usage: babeltrace [GENERAL OPTIONS] convert [OPTIONS]\n");
+       fprintf(fp, "\n");
+       fprintf(fp, "Options:\n");
+       fprintf(fp, "\n");
+       fprintf(fp, "  -b, --base-params=PARAMS          Set PARAMS as the current base parameters\n");
+       fprintf(fp, "                                    for the following component instances\n");
+       fprintf(fp, "                                    (see the expected format of PARAMS below)\n");
+       fprintf(fp, "      --begin=BEGIN                 Set the `begin` parameter of the latest\n");
        fprintf(fp, "                                    source component instance to BEGIN\n");
        fprintf(fp, "                                    (see the suggested format of BEGIN below)\n");
+       fprintf(fp, "  -c, --connect=CONNECTION          Connect two component instances (see the\n");
+       fprintf(fp, "                                    expected format of CONNECTION below)\n");
        fprintf(fp, "  -d, --debug                       Enable debug mode\n");
        fprintf(fp, "      --end=END                     Set the `end` parameter of the latest\n");
        fprintf(fp, "                                    source component instance to END\n");
        fprintf(fp, "                                    (see the suggested format of BEGIN below)\n");
+       fprintf(fp, "      --name=NAME                   Set the name of the latest component\n");
+       fprintf(fp, "                                    instance to NAME (must be unique amongst\n");
+       fprintf(fp, "                                    all the names of the component instances)\n");
        fprintf(fp, "      --omit-home-plugin-path       Omit home plugins from plugin search path\n");
        fprintf(fp, "                                    (~/.local/lib/babeltrace/plugins)\n");
        fprintf(fp, "      --omit-system-plugin-path     Omit system plugins from plugin search path\n");
@@ -2512,35 +3151,27 @@ void print_convert_usage(FILE *fp)
        fprintf(fp, "\n");
        fprintf(fp, "    [YYYY-MM-DD [hh:mm:]]ss[.nnnnnnnnn]\n");
        fprintf(fp, "\n\n");
-       fprintf(fp, "Expected format of PARAMS\n");
-       fprintf(fp, "-------------------------\n");
+       fprintf(fp, "Expected format of CONNECTION\n");
+       fprintf(fp, "-----------------------------\n");
        fprintf(fp, "\n");
-       fprintf(fp, "    PARAM=VALUE[,PARAM=VALUE]...\n");
+       fprintf(fp, "    SRC[.SRCPORT]:DST[.DSTPORT]\n");
        fprintf(fp, "\n");
-       fprintf(fp, "The parameter string is a comma-separated list of PARAM=VALUE assignments,\n");
-       fprintf(fp, "where PARAM is the parameter name (C identifier plus [:.-] characters), and\n");
-       fprintf(fp, "VALUE can be one of:\n");
+       fprintf(fp, "SRC and DST are the names of the source and destination component\n");
+       fprintf(fp, "instances to connect together. You can set the name of a component\n");
+       fprintf(fp, "instance with the --name option.\n");
        fprintf(fp, "\n");
-       fprintf(fp, "* `null`, `nul`, `NULL`: null value (no backticks).\n");
-       fprintf(fp, "* `true`, `TRUE`, `yes`, `YES`: true boolean value (no backticks).\n");
-       fprintf(fp, "* `false`, `FALSE`, `no`, `NO`: false boolean value (no backticks).\n");
-       fprintf(fp, "* Binary (`0b` prefix), octal (`0` prefix), decimal, or hexadecimal\n");
-       fprintf(fp, "  (`0x` prefix) signed 64-bit integer.\n");
-       fprintf(fp, "* Double precision floating point number (scientific notation is accepted).\n");
-       fprintf(fp, "* Unquoted string with no special characters, and not matching any of\n");
-       fprintf(fp, "  the null and boolean value symbols above.\n");
-       fprintf(fp, "* Double-quoted string (accepts escape characters).\n");
+       fprintf(fp, "SRCPORT and DSTPORT are the optional source and destination ports to use\n");
+       fprintf(fp, "for the connection. When the port is not specified, the default port is\n");
+       fprintf(fp, "used.\n");
        fprintf(fp, "\n");
-       fprintf(fp, "Whitespaces are allowed around individual `=` and `,` tokens.\n");
+       fprintf(fp, "You can connect a source component to a filter or sink component. You\n");
+       fprintf(fp, "can connect a filter component to a sink component.\n");
        fprintf(fp, "\n");
        fprintf(fp, "Example:\n");
        fprintf(fp, "\n");
-       fprintf(fp, "    many=null, fresh=yes, condition=false, squirrel=-782329,\n");
-       fprintf(fp, "    observe=3.14, simple=beef, needs-quotes=\"some string\",\n");
-       fprintf(fp, "    escape.chars-are:allowed=\"this is a \\\" double quote\"\n");
-       fprintf(fp, "\n");
-       fprintf(fp, "IMPORTANT: Make sure to single-quote the whole argument when you run babeltrace\n");
-       fprintf(fp, "from a shell.\n");
+       fprintf(fp, "    my-filter.top10:json-out\n");
+       fprintf(fp, "\n\n");
+       print_expected_params_format(fp);
 }
 
 static struct poptOption convert_long_options[] = {
@@ -2554,6 +3185,7 @@ static struct poptOption convert_long_options[] = {
        { "clock-offset", '\0', POPT_ARG_STRING, NULL, OPT_CLOCK_OFFSET, NULL, NULL },
        { "clock-offset-ns", '\0', POPT_ARG_STRING, NULL, OPT_CLOCK_OFFSET_NS, NULL, NULL },
        { "clock-seconds", '\0', POPT_ARG_NONE, NULL, OPT_CLOCK_SECONDS, NULL, NULL },
+       { "connect", 'c', POPT_ARG_STRING, NULL, OPT_CONNECT, NULL, NULL },
        { "debug", 'd', POPT_ARG_NONE, NULL, OPT_DEBUG, NULL, NULL },
        { "debug-info-dir", 0, POPT_ARG_STRING, NULL, OPT_DEBUG_INFO_DIR, NULL, NULL },
        { "debug-info-full-path", 0, POPT_ARG_NONE, NULL, OPT_DEBUG_INFO_FULL_PATH, NULL, NULL },
@@ -2562,6 +3194,7 @@ static struct poptOption convert_long_options[] = {
        { "fields", 'f', POPT_ARG_STRING, NULL, OPT_FIELDS, NULL, NULL },
        { "help", 'h', POPT_ARG_NONE, NULL, OPT_HELP, NULL, NULL },
        { "input-format", 'i', POPT_ARG_STRING, NULL, OPT_INPUT_FORMAT, NULL, NULL },
+       { "name", '\0', POPT_ARG_STRING, NULL, OPT_NAME, NULL, NULL },
        { "names", 'n', POPT_ARG_STRING, NULL, OPT_NAMES, NULL, NULL },
        { "no-delta", '\0', POPT_ARG_NONE, NULL, OPT_NO_DELTA, NULL, NULL },
        { "omit-home-plugin-path", '\0', POPT_ARG_NONE, NULL, OPT_OMIT_HOME_PLUGIN_PATH, NULL, NULL },
@@ -2608,6 +3241,9 @@ struct bt_config *bt_config_convert_from_args(int argc, const char *argv[],
        struct bt_value *cur_base_params = NULL;
        int opt, ret = 0;
        struct bt_config *cfg = NULL;
+       struct bt_value *instance_names = NULL;
+       struct bt_value *connection_args = NULL;
+       char error_buf[256] = { 0 };
 
        *retcode = 0;
        memset(&ctf_legacy_opts, 0, sizeof(ctf_legacy_opts));
@@ -2657,6 +3293,18 @@ struct bt_config *bt_config_convert_from_args(int argc, const char *argv[],
                goto error;
        }
 
+       instance_names = bt_value_map_create();
+       if (!instance_names) {
+               print_err_oom();
+               goto error;
+       }
+
+       connection_args = bt_value_array_create();
+       if (!connection_args) {
+               print_err_oom();
+               goto error;
+       }
+
        ret = append_env_var_plugin_paths(cfg->cmd_data.convert.plugin_paths);
        if (ret) {
                printf_err("Cannot append plugin paths from BABELTRACE_PLUGIN_PATH\n");
@@ -2664,16 +3312,17 @@ struct bt_config *bt_config_convert_from_args(int argc, const char *argv[],
        }
 
        /* Note: implicit source never gets positional base params. */
-       implicit_source_comp = bt_config_component_from_arg(DEFAULT_SOURCE_COMPONENT_NAME);
-       if (implicit_source_comp) {
-               cur_cfg_comp = implicit_source_comp;
-               cur_is_implicit_source = true;
-               use_implicit_source = true;
-       } else {
-               printf_debug("Cannot find implicit source plugin `%s`",
-                       DEFAULT_SOURCE_COMPONENT_NAME);
+       implicit_source_comp = bt_config_component_from_arg(
+               BT_COMPONENT_CLASS_TYPE_SOURCE, DEFAULT_SOURCE_COMPONENT_NAME);
+       if (!implicit_source_comp) {
+               print_err_oom();
+               goto error;
        }
 
+       cur_cfg_comp = implicit_source_comp;
+       cur_is_implicit_source = true;
+       use_implicit_source = true;
+
        /* Parse options */
        pc = poptGetContext(NULL, argc, (const char **) argv,
                convert_long_options, 0);
@@ -2766,7 +3415,8 @@ struct bt_config *bt_config_convert_from_args(int argc, const char *argv[],
                                        cur_cfg_comp_dest);
                        }
 
-                       cur_cfg_comp = bt_config_component_from_arg(arg);
+                       cur_cfg_comp = bt_config_component_from_arg(
+                               BT_COMPONENT_CLASS_TYPE_SOURCE, arg);
                        if (!cur_cfg_comp) {
                                printf_err("Invalid format for --source option's argument:\n    %s\n",
                                        arg);
@@ -2828,7 +3478,8 @@ struct bt_config *bt_config_convert_from_args(int argc, const char *argv[],
                                        cur_cfg_comp_dest);
                        }
 
-                       cur_cfg_comp = bt_config_component_from_arg(arg);
+                       cur_cfg_comp = bt_config_component_from_arg(
+                               BT_COMPONENT_CLASS_TYPE_SINK, arg);
                        if (!cur_cfg_comp) {
                                printf_err("Invalid format for --sink option's argument:\n    %s\n",
                                        arg);
@@ -2892,6 +3543,27 @@ struct bt_config *bt_config_convert_from_args(int argc, const char *argv[],
                                goto error;
                        }
                        break;
+               case OPT_NAME:
+                       if (!cur_cfg_comp) {
+                               printf_err("Cannot set the name of unavailable default source component `%s`:\n    %s\n",
+                                       DEFAULT_SOURCE_COMPONENT_NAME, arg);
+                               goto error;
+                       }
+
+                       if (bt_value_map_has_key(instance_names, arg)) {
+                               printf_err("Duplicate component instance name:\n    %s\n",
+                                       arg);
+                               goto error;
+                       }
+
+                       g_string_assign(cur_cfg_comp->instance_name, arg);
+
+                       if (bt_value_map_insert(instance_names,
+                                       arg, bt_value_null)) {
+                               print_err_oom();
+                               goto error;
+                       }
+                       break;
                case OPT_BASE_PARAMS:
                {
                        struct bt_value *params = bt_value_from_arg(arg);
@@ -3064,6 +3736,13 @@ struct bt_config *bt_config_convert_from_args(int argc, const char *argv[],
                        }
                        break;
                }
+               case OPT_CONNECT:
+                       if (bt_value_array_append_string(connection_args,
+                                       arg)) {
+                               print_err_oom();
+                               goto error;
+                       }
+                       break;
                case OPT_HELP:
                        print_convert_usage(stdout);
                        *retcode = -1;
@@ -3176,7 +3855,9 @@ struct bt_config *bt_config_convert_from_args(int argc, const char *argv[],
 
        if (cfg->cmd_data.convert.sinks->len == 0) {
                /* Use implicit sink as default. */
-               cur_cfg_comp = bt_config_component_from_arg(DEFAULT_SINK_COMPONENT_NAME);
+               cur_cfg_comp = bt_config_component_from_arg(
+                       BT_COMPONENT_CLASS_TYPE_SINK,
+                       DEFAULT_SINK_COMPONENT_NAME);
                if (!cur_cfg_comp) {
                        printf_error("Cannot find implicit sink plugin `%s`\n",
                                DEFAULT_SINK_COMPONENT_NAME);
@@ -3186,6 +3867,13 @@ struct bt_config *bt_config_convert_from_args(int argc, const char *argv[],
                cur_cfg_comp = NULL;
        }
 
+       ret = bt_config_create_connections(cfg, connection_args,
+               error_buf, 256);
+       if (ret) {
+               printf_err("Cannot creation connections:\n%s", error_buf);
+               goto error;
+       }
+
        goto end;
 
 error:
@@ -3216,6 +3904,8 @@ end:
        BT_PUT(text_legacy_opts.names);
        BT_PUT(text_legacy_opts.fields);
        BT_PUT(legacy_input_paths);
+       BT_PUT(instance_names);
+       BT_PUT(connection_args);
        return cfg;
 }
 
@@ -3238,7 +3928,9 @@ void print_gen_usage(FILE *fp)
        fprintf(fp, "Available commands:\n");
        fprintf(fp, "\n");
        fprintf(fp, "    convert       Build a trace conversion graph and run it (default)\n");
+       fprintf(fp, "    help          Get help for a plugin or a component class\n");
        fprintf(fp, "    list-plugins  List available plugins and their content\n");
+       fprintf(fp, "    query-info    Query information from a component class\n");
        fprintf(fp, "\n");
        fprintf(fp, "Use `babeltrace COMMAND --help` to show the help of COMMAND.\n");
 }
@@ -3285,20 +3977,20 @@ struct bt_config *bt_config_from_args(int argc, const char *argv[],
                        print_legacy_usage(stdout);
                        goto end;
                } else {
+                       bool has_command = true;
+
                        /*
                         * First unknown argument: is it a known command
                         * name?
                         */
                        if (strcmp(cur_arg, "convert") == 0) {
                                command = BT_CONFIG_COMMAND_CONVERT;
-                               command_argv = &argv[i];
-                               command_argc = argc - i;
-                               command_name = cur_arg;
                        } else if (strcmp(cur_arg, "list-plugins") == 0) {
                                command = BT_CONFIG_COMMAND_LIST_PLUGINS;
-                               command_argv = &argv[i];
-                               command_argc = argc - i;
-                               command_name = cur_arg;
+                       } else if (strcmp(cur_arg, "help") == 0) {
+                               command = BT_CONFIG_COMMAND_HELP;
+                       } else if (strcmp(cur_arg, "query-info") == 0) {
+                               command = BT_CONFIG_COMMAND_QUERY_INFO;
                        } else {
                                /*
                                 * Unknown argument, but not a known
@@ -3309,6 +4001,13 @@ struct bt_config *bt_config_from_args(int argc, const char *argv[],
                                command = BT_CONFIG_COMMAND_CONVERT;
                                command_argv = argv;
                                command_argc = argc;
+                               has_command = false;
+                       }
+
+                       if (has_command) {
+                               command_argv = &argv[i];
+                               command_argc = argc - i;
+                               command_name = cur_arg;
                        }
                        break;
                }
@@ -3339,6 +4038,16 @@ struct bt_config *bt_config_from_args(int argc, const char *argv[],
                        command_argv, retcode, omit_system_plugin_path,
                        omit_home_plugin_path, initial_plugin_paths);
                break;
+       case BT_CONFIG_COMMAND_HELP:
+               config = bt_config_help_from_args(command_argc,
+                       command_argv, retcode, omit_system_plugin_path,
+                       omit_home_plugin_path, initial_plugin_paths);
+               break;
+       case BT_CONFIG_COMMAND_QUERY_INFO:
+               config = bt_config_query_info_from_args(command_argc,
+                       command_argv, retcode, omit_system_plugin_path,
+                       omit_home_plugin_path, initial_plugin_paths);
+               break;
        default:
                assert(false);
        }
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