Fix: print usage even if omit arguments are received
[babeltrace.git] / converter / babeltrace-cfg.c
index fca9820662cc0ef9d9965cf50d20a64fec0b1ff9..6beaf383bfdfef77c2f69f0be9020986699a9891 100644 (file)
 #include <babeltrace/values.h>
 #include <popt.h>
 #include <glib.h>
+#include <sys/types.h>
+#include <pwd.h>
 #include "babeltrace-cfg.h"
 
+#define SYSTEM_PLUGIN_PATH             INSTALL_LIBDIR "/babeltrace/plugins"
+#define DEFAULT_SOURCE_COMPONENT_NAME  "ctf.fs"
+#define DEFAULT_SINK_COMPONENT_NAME    "text.text"
+#define HOME_ENV_VAR                   "HOME"
+#define HOME_SUBPATH                   "/.babeltrace/plugins"
+
 /*
  * Error printf() macro which prepends "Error: " the first time it's
  * called. This gives a nicer feel than having a bunch of error prefixes
@@ -140,6 +148,9 @@ enum legacy_output_format {
        LEGACY_OUTPUT_FORMAT_DUMMY,
 };
 
+static bool omit_system_plugin_path;
+static bool omit_home_plugin_path;
+
 /*
  * Prints the "out of memory" error.
  */
@@ -280,7 +291,7 @@ int ini_handle_state(struct ini_parsing_state *state)
 
                if (bt_value_map_has_key(state->params, state->last_map_key)) {
                        g_string_append_printf(state->ini_error,
-                               "Duplicate parameter key: \"%s\"\n",
+                               "Duplicate parameter key: `%s`\n",
                                state->last_map_key);
                        goto error;
                }
@@ -722,20 +733,19 @@ void print_legacy_usage(FILE *fp)
        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 timestamps in GMT time zone\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, "                               (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, "                               (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, "                                 callsite\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");
@@ -760,22 +770,29 @@ void print_usage(FILE *fp)
        fprintf(fp, "                                    instances (see the exact format of PARAMS\n");
        fprintf(fp, "                                    below)\n");
        fprintf(fp, "  -d, --debug                       Enable debug mode\n");
-       fprintf(fp, "  -i, --source=PLUGIN.COMPCLS       Instantiate a source component from plugin\n");
-       fprintf(fp, "                                    PLUGIN and component class COMPCLS (may be\n");
-       fprintf(fp, "                                    repeated)\n");
        fprintf(fp, "  -l, --list                        List available plugins and their components\n");
-       fprintf(fp, "  -o, --sink=PLUGIN.COMPCLS         Instantiate a sink component from plugin\n");
-       fprintf(fp, "                                    PLUGIN and component class COMPCLS (may be\n");
-       fprintf(fp, "                                    repeated)\n");
-       fprintf(fp, "  -P, --plugin-path=PATH[:PATH]...  Set paths from which dynamic plugins can be\n");
-       fprintf(fp, "                                    loaded to PATH\n");
+       fprintf(fp, "  -P, --path=PATH                   Set the `path` parameter of the latest source\n");
+       fprintf(fp, "                                    or sink component to PATH\n");
        fprintf(fp, "  -p, --params=PARAMS               Set the parameters of the latest source or\n");
        fprintf(fp, "                                    sink component instance (in command-line \n");
        fprintf(fp, "                                    order) to PARAMS (see the exact format of\n");
        fprintf(fp, "                                    PARAMS below)\n");
+       fprintf(fp, "      --plugin-path=PATH[:PATH]...  Set paths from which dynamic plugins can be\n");
+       fprintf(fp, "                                    loaded to PATH\n");
        fprintf(fp, "  -r, --reset-base-params           Reset the current base parameters of the\n");
        fprintf(fp, "                                    following source and sink component\n");
        fprintf(fp, "                                    instances to an empty map\n");
+       fprintf(fp, "  -o, --sink=PLUGIN.COMPCLS         Instantiate a sink component from plugin\n");
+       fprintf(fp, "                                    PLUGIN and component class COMPCLS (may be\n");
+       fprintf(fp, "                                    repeated)\n");
+       fprintf(fp, "  -i, --source=PLUGIN.COMPCLS       Instantiate a source component from plugin\n");
+       fprintf(fp, "                                    PLUGIN and component class COMPCLS (may be\n");
+       fprintf(fp, "                                    repeated)\n");
+       fprintf(fp, "      --begin                       Start time: [YYYY-MM-DD [hh:mm:]]ss[.nnnnnnnnn]\n");
+       fprintf(fp, "      --end                         End time: [YYYY-MM-DD [hh:mm:]]ss[.nnnnnnnnn]\n");
+       fprintf(fp, "      --timerange                   Time range: begin,end or [begin,end] (where [] are actual brackets)\n");
+       fprintf(fp, "      --omit-system-plugin-path     Omit system plugins from plugin search path\n");
+       fprintf(fp, "      --omit-home-plugin-path       Omit home plugins from plugin search path\n");
        fprintf(fp, "  -h  --help                        Show this help\n");
        fprintf(fp, "      --help-legacy                 Show Babeltrace 1.x legacy options\n");
        fprintf(fp, "  -v, --verbose                     Enable verbose output\n");
@@ -901,7 +918,7 @@ struct bt_config_component *bt_config_component_from_arg(const char *arg)
 
        plugin_component_names_from_arg(arg, &plugin_name, &component_name);
        if (!plugin_name || !component_name) {
-               printf_err("Cannot get plugin or component name\n");
+               printf_err("Cannot get plugin or component class name\n");
                goto error;
        }
 
@@ -950,6 +967,12 @@ end:
        return;
 }
 
+static
+bool is_setuid_setgid(void)
+{
+       return (geteuid() != getuid() || getegid() != getgid());
+}
+
 /*
  * Extracts the various paths from the string arg, delimited by ':',
  * and converts them to an array value object.
@@ -959,18 +982,12 @@ end:
  * Return value is owned by the caller.
  */
 static
-struct bt_value *plugin_paths_from_arg(const char *arg)
+enum bt_value_status plugin_paths_from_arg(struct bt_value *plugin_paths,
+               const char *arg)
 {
-       struct bt_value *plugin_paths;
        const char *at = arg;
        const char *end = arg + strlen(arg);
 
-       plugin_paths = bt_value_array_create();
-       if (!plugin_paths) {
-               print_err_oom();
-               goto error;
-       }
-
        while (at < end) {
                int ret;
                GString *path;
@@ -1005,13 +1022,9 @@ struct bt_value *plugin_paths_from_arg(const char *arg)
                }
        }
 
-       goto end;
-
+       return BT_VALUE_STATUS_OK;
 error:
-       BT_PUT(plugin_paths);
-
-end:
-       return plugin_paths;
+       return BT_VALUE_STATUS_ERROR;
 }
 
 /*
@@ -1143,7 +1156,7 @@ struct bt_value *names_from_arg(const char *arg)
                                        goto error;
                                }
                        } else {
-                               printf_err("Unknown field name: \"%s\"\n",
+                               printf_err("Unknown field name: `%s`\n",
                                        identifier);
                                goto error;
                        }
@@ -1160,7 +1173,7 @@ struct bt_value *names_from_arg(const char *arg)
 
 end:
        if (found_none && found_all) {
-               printf_err("Only either \"all\" or \"none\" can be specified in the list given to the \"--names\" option, but not both.\n");
+               printf_err("Only either `all` or `none` can be specified in the list given to the --names option, but not both.\n");
                goto error;
        }
        /*
@@ -1235,7 +1248,7 @@ struct bt_value *fields_from_arg(const char *arg)
                                        goto error;
                                }
                        } else {
-                               printf_err("Unknown field name: \"%s\"\n",
+                               printf_err("Unknown field name: `%s`\n",
                                        identifier);
                                goto error;
                        }
@@ -1812,9 +1825,9 @@ void print_output_legacy_to_sinks(
                assert(false);
        }
 
-       printf_err("Both \"%s\" legacy output format and non-legacy sink(s) specified.\n\n",
+       printf_err("Both `%s` legacy output format and non-legacy sink component\ninstances(s) specified.\n\n",
                input_format);
-       printf_err("Specify the following non-legacy sink instead of the legacy \"%s\"\noutput format options:\n\n",
+       printf_err("Specify the following non-legacy sink component instance instead of the\nlegacy `%s` output format options:\n\n",
                input_format);
        g_string_append(str, "-o ");
 
@@ -1923,9 +1936,9 @@ void print_input_legacy_to_sources(enum legacy_input_format legacy_input_format,
                assert(false);
        }
 
-       printf_err("Both \"%s\" legacy input format and non-legacy source(s) specified.\n\n",
+       printf_err("Both `%s` legacy input format and non-legacy source component\ninstance(s) specified.\n\n",
                input_format);
-       printf_err("Specify the following non-legacy source(s) instead of the legacy \"%s\"\ninput format options and positional arguments:\n\n",
+       printf_err("Specify the following non-legacy source component instance(s) instead of the\nlegacy `%s` input format options and positional arguments:\n\n",
                input_format);
 
        for (i = 0; i < bt_value_array_size(legacy_input_paths); i++) {
@@ -1999,14 +2012,12 @@ bool validate_cfg(struct bt_config *cfg,
 
        /* Determine if the input and output should be legacy-style */
        if (*legacy_input_format != LEGACY_INPUT_FORMAT_NONE ||
-                       cfg->sources->len == 0 ||
                        !bt_value_array_is_empty(legacy_input_paths) ||
                        ctf_legacy_opts_is_any_set(ctf_legacy_opts)) {
                legacy_input = true;
        }
 
        if (*legacy_output_format != LEGACY_OUTPUT_FORMAT_NONE ||
-                       cfg->sinks->len == 0 ||
                        text_legacy_opts_is_any_set(text_legacy_opts)) {
                legacy_output = true;
        }
@@ -2021,10 +2032,10 @@ bool validate_cfg(struct bt_config *cfg,
                if (bt_value_array_is_empty(legacy_input_paths)) {
                        switch (*legacy_input_format) {
                        case LEGACY_INPUT_FORMAT_CTF:
-                               printf_err("No input path specified for legacy \"ctf\" input format\n");
+                               printf_err("No input path specified for legacy `ctf` input format\n");
                                break;
                        case LEGACY_INPUT_FORMAT_LTTNG_LIVE:
-                               printf_err("No URL specified for legacy \"lttng-live\" input format\n");
+                               printf_err("No URL specified for legacy `lttng-live` input format\n");
                                break;
                        default:
                                assert(false);
@@ -2056,7 +2067,7 @@ bool validate_cfg(struct bt_config *cfg,
                if (text_legacy_opts_is_any_set(text_legacy_opts) &&
                                *legacy_output_format !=
                                LEGACY_OUTPUT_FORMAT_TEXT) {
-                       printf_err("Options for legacy \"text\" output format specified with a different legacy output format\n");
+                       printf_err("Options for legacy `text` output format specified with a different legacy output format\n");
                        goto error;
                }
 
@@ -2074,7 +2085,7 @@ bool validate_cfg(struct bt_config *cfg,
         */
        if (*legacy_output_format == LEGACY_OUTPUT_FORMAT_CTF_METADATA &&
                        *legacy_input_format != LEGACY_INPUT_FORMAT_CTF) {
-               printf_err("Legacy \"ctf-metadata\" output format requires using legacy \"ctf\" input format\n");
+               printf_err("Legacy `ctf-metadata` output format requires using legacy `ctf` input format\n");
                goto error;
        }
 
@@ -2107,6 +2118,7 @@ int parse_int64(const char *arg, int64_t *val)
 enum {
        OPT_NONE = 0,
        OPT_BASE_PARAMS,
+       OPT_BEGIN,
        OPT_CLOCK_CYCLES,
        OPT_CLOCK_DATE,
        OPT_CLOCK_FORCE_CORRELATE,
@@ -2118,6 +2130,7 @@ enum {
        OPT_DEBUG_INFO_DIR,
        OPT_DEBUG_INFO_FULL_PATH,
        OPT_DEBUG_INFO_TARGET_PREFIX,
+       OPT_END,
        OPT_FIELDS,
        OPT_HELP,
        OPT_HELP_LEGACY,
@@ -2127,20 +2140,25 @@ enum {
        OPT_NO_DELTA,
        OPT_OUTPUT_FORMAT,
        OPT_OUTPUT_PATH,
+       OPT_PATH,
        OPT_PARAMS,
        OPT_PLUGIN_PATH,
        OPT_RESET_BASE_PARAMS,
        OPT_SINK,
        OPT_SOURCE,
        OPT_STREAM_INTERSECTION,
+       OPT_TIMERANGE,
        OPT_VERBOSE,
        OPT_VERSION,
+       OPT_OMIT_SYSTEM_PLUGIN_PATH,
+       OPT_OMIT_HOME_PLUGIN_PATH,
 };
 
 /* popt long option descriptions */
 static struct poptOption long_options[] = {
        /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
        { "base-params", 'b', POPT_ARG_STRING, NULL, OPT_BASE_PARAMS, NULL, NULL },
+       { "begin", '\0', POPT_ARG_STRING, NULL, OPT_BEGIN, NULL, NULL },
        { "clock-cycles", '\0', POPT_ARG_NONE, NULL, OPT_CLOCK_CYCLES, NULL, NULL },
        { "clock-date", '\0', POPT_ARG_NONE, NULL, OPT_CLOCK_DATE, NULL, NULL },
        { "clock-force-correlate", '\0', POPT_ARG_NONE, NULL, OPT_CLOCK_FORCE_CORRELATE, NULL, NULL },
@@ -2152,6 +2170,7 @@ static struct poptOption long_options[] = {
        { "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 },
        { "debug-info-target-prefix", 0, POPT_ARG_STRING, NULL, OPT_DEBUG_INFO_TARGET_PREFIX, NULL, NULL },
+       { "end", '\0', POPT_ARG_STRING, NULL, OPT_END, NULL, NULL },
        { "fields", 'f', POPT_ARG_STRING, NULL, OPT_FIELDS, NULL, NULL },
        { "help", 'h', POPT_ARG_NONE, NULL, OPT_HELP, NULL, NULL },
        { "help-legacy", '\0', POPT_ARG_NONE, NULL, OPT_HELP_LEGACY, NULL, NULL },
@@ -2161,14 +2180,18 @@ static struct poptOption long_options[] = {
        { "no-delta", '\0', POPT_ARG_NONE, NULL, OPT_NO_DELTA, NULL, NULL },
        { "output", 'w', POPT_ARG_STRING, NULL, OPT_OUTPUT_PATH, NULL, NULL },
        { "output-format", 'o', POPT_ARG_STRING, NULL, OPT_OUTPUT_FORMAT, NULL, NULL },
+       { "path", 'P', POPT_ARG_STRING, NULL, OPT_PATH, NULL, NULL },
        { "params", 'p', POPT_ARG_STRING, NULL, OPT_PARAMS, NULL, NULL },
-       { "plugin-path", 'P', POPT_ARG_STRING, NULL, OPT_PLUGIN_PATH, NULL, NULL },
+       { "plugin-path", '\0', POPT_ARG_STRING, NULL, OPT_PLUGIN_PATH, NULL, NULL },
        { "reset-base-params", 'r', POPT_ARG_NONE, NULL, OPT_RESET_BASE_PARAMS, NULL, NULL },
        { "sink", '\0', POPT_ARG_STRING, NULL, OPT_SINK, NULL, NULL },
        { "source", '\0', POPT_ARG_STRING, NULL, OPT_SOURCE, NULL, NULL },
        { "stream-intersection", '\0', POPT_ARG_NONE, NULL, OPT_STREAM_INTERSECTION, NULL, NULL },
+       { "timerange", '\0', POPT_ARG_STRING, NULL, OPT_TIMERANGE, NULL, NULL },
        { "verbose", 'v', POPT_ARG_NONE, NULL, OPT_VERBOSE, NULL, NULL },
        { "version", 'V', POPT_ARG_NONE, NULL, OPT_VERSION, NULL, NULL },
+       { "omit-system-plugin-path", '\0', POPT_ARG_NONE, NULL, OPT_OMIT_SYSTEM_PLUGIN_PATH, NULL, NULL },
+       { "omit-home-plugin-path", '\0', POPT_ARG_NONE, NULL, OPT_OMIT_HOME_PLUGIN_PATH, NULL, NULL },
        { NULL, 0, 0, NULL, 0, NULL, NULL },
 };
 
@@ -2201,6 +2224,129 @@ static void add_cfg_comp(struct bt_config *cfg,
        }
 }
 
+static int split_timerange(const char *arg, const char **begin, const char **end)
+{
+       const char *c;
+
+       /* Try to match [begin,end] */
+       c = strchr(arg, '[');
+       if (!c)
+               goto skip;
+       *begin = ++c;
+       c = strchr(c, ',');
+       if (!c)
+               goto skip;
+       *end = ++c;
+       c = strchr(c, ']');
+       if (!c)
+               goto skip;
+       goto found;
+
+skip:
+       /* Try to match begin,end */
+       c = arg;
+       *begin = c;
+       c = strchr(c, ',');
+       if (!c)
+               goto not_found;
+       *end = ++c;
+       /* fall-through */
+found:
+       return 0;
+not_found:
+       return -1;
+}
+
+static char *bt_secure_getenv(const char *name)
+{
+       if (is_setuid_setgid()) {
+               printf_err("Disregarding %s environment variable for setuid/setgid binary", name);
+               return NULL;
+       }
+       return getenv(name);
+}
+
+static const char *get_home_dir(void)
+{
+       char *val = NULL;
+       struct passwd *pwd;
+
+       val = bt_secure_getenv(HOME_ENV_VAR);
+       if (val) {
+               goto end;
+       }
+       /* Fallback on password file. */
+       pwd = getpwuid(getuid());
+       if (!pwd) {
+               goto end;
+       }
+       val = pwd->pw_dir;
+end:
+       return val;
+}
+
+static int add_internal_plugin_paths(struct bt_config *cfg)
+{
+       if (!omit_home_plugin_path) {
+               char path[PATH_MAX];
+               const char *home_dir;
+
+               if (is_setuid_setgid()) {
+                       printf_debug("Skipping non-system plugin paths for setuid/setgid binary.");
+               } else {
+                       home_dir = get_home_dir();
+                       if (home_dir) {
+                               if (strlen(home_dir) + strlen(HOME_SUBPATH) + 1
+                                               >= PATH_MAX) {
+                                       printf_err("Home directory path too long\n");
+                                       goto error;
+                               }
+                               strcpy(path, home_dir);
+                               strcat(path, HOME_SUBPATH);
+                               if (plugin_paths_from_arg(cfg->plugin_paths, path)) {
+                                       printf_err("Invalid home plugin path\n");
+                                       goto error;
+                               }
+                       }
+               }
+       }
+
+       if (!omit_system_plugin_path) {
+               if (plugin_paths_from_arg(cfg->plugin_paths,
+                               SYSTEM_PLUGIN_PATH)) {
+                       printf_err("Invalid system plugin path\n");
+                       goto error;
+               }
+       }
+       return 0;
+error:
+       return -1;
+}
+
+static int append_sources_from_implicit_params(GPtrArray *sources,
+               struct bt_config_component *implicit_source_comp)
+{
+       size_t i;
+       size_t len = sources->len;
+
+       for (i = 0; i < len; i++) {
+               struct bt_config_component *comp;
+               struct bt_value *params_to_set;
+
+               comp = g_ptr_array_index(sources, i);
+               params_to_set = bt_value_map_extend(comp->params,
+                       implicit_source_comp->params);
+               if (!params_to_set) {
+                       printf_err("Cannot extend legacy component parameters with non-legacy parameters\n");
+                       goto error;
+               }
+               BT_MOVE(comp->params, params_to_set);
+       }
+       return 0;
+error:
+       return -1;
+}
+
 /*
  * Returns a Babeltrace configuration, out of command-line arguments,
  * containing everything that is needed to instanciate specific
@@ -2211,31 +2357,30 @@ static void add_cfg_comp(struct bt_config *cfg,
  *
  * Return value is NULL on error, otherwise it's owned by the caller.
  */
-struct bt_config *bt_config_from_args(int argc, char *argv[], int *exit_code)
+struct bt_config *bt_config_from_args(int argc, const char *argv[], int *exit_code)
 {
        struct bt_config *cfg = NULL;
        poptContext pc = NULL;
        char *arg = NULL;
-       struct ctf_legacy_opts ctf_legacy_opts = { 0 };
-       struct text_legacy_opts text_legacy_opts = { 0 };
+       struct ctf_legacy_opts ctf_legacy_opts;
+       struct text_legacy_opts text_legacy_opts;
        enum legacy_input_format legacy_input_format = LEGACY_INPUT_FORMAT_NONE;
        enum legacy_output_format legacy_output_format =
                LEGACY_OUTPUT_FORMAT_NONE;
        struct bt_value *legacy_input_paths = NULL;
+       struct bt_config_component *implicit_source_comp = NULL;
        struct bt_config_component *cur_cfg_comp = NULL;
+       bool cur_is_implicit_source = false;
+       bool use_implicit_source = false;
        enum bt_config_component_dest cur_cfg_comp_dest =
                BT_CONFIG_COMPONENT_DEST_SOURCE;
        struct bt_value *cur_base_params = NULL;
-       int opt;
-       bool cur_cfg_comp_params_set = false;
+       int opt, nr_omit_opt = 0;
 
+       memset(&ctf_legacy_opts, 0, sizeof(ctf_legacy_opts));
+       memset(&text_legacy_opts, 0, sizeof(text_legacy_opts));
        *exit_code = 0;
 
-       if (argc <= 1) {
-               print_usage(stdout);
-               goto end;
-       }
-
        text_legacy_opts.output = g_string_new(NULL);
        if (!text_legacy_opts.output) {
                print_err_oom();
@@ -2286,6 +2431,23 @@ struct bt_config *bt_config_from_args(int argc, char *argv[], int *exit_code)
                goto error;
        }
 
+       /* 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);
+       }
+
+       cfg->plugin_paths = bt_value_array_create();
+       if (!cfg->plugin_paths) {
+               print_err_oom();
+               goto error;
+       }
+
        /* Parse options */
        pc = poptGetContext(NULL, argc, (const char **) argv, long_options, 0);
        if (!pc) {
@@ -2300,17 +2462,23 @@ struct bt_config *bt_config_from_args(int argc, char *argv[], int *exit_code)
 
                switch (opt) {
                case OPT_PLUGIN_PATH:
-                       if (cfg->plugin_paths) {
-                               printf_err("Duplicate --plugin-path option\n");
-                               goto error;
-                       }
-
-                       cfg->plugin_paths = plugin_paths_from_arg(arg);
-                       if (!cfg->plugin_paths) {
-                               printf_err("Invalid --plugin-path option's argument\n");
-                               goto error;
+                       if (is_setuid_setgid()) {
+                               printf_debug("Skipping non-system plugin paths for setuid/setgid binary.");
+                       } else {
+                               if (plugin_paths_from_arg(cfg->plugin_paths, arg)) {
+                                       printf_err("Invalid --plugin-path option's argument\n");
+                                       goto error;
+                               }
                        }
                        break;
+               case OPT_OMIT_SYSTEM_PLUGIN_PATH:
+                       omit_system_plugin_path = true;
+                       nr_omit_opt += 2;
+                       break;
+               case OPT_OMIT_HOME_PLUGIN_PATH:
+                       omit_home_plugin_path = true;
+                       nr_omit_opt += 2;
+                       break;
                case OPT_OUTPUT_PATH:
                        if (text_legacy_opts.output->len > 0) {
                                printf_err("Duplicate --output option\n");
@@ -2362,24 +2530,31 @@ struct bt_config *bt_config_from_args(int argc, char *argv[], int *exit_code)
                                }
                        }
 
+                       use_implicit_source = false;
+
                        /* Non-legacy: try to create a component config */
-                       if (cur_cfg_comp) {
+                       if (cur_cfg_comp && !cur_is_implicit_source) {
                                add_cfg_comp(cfg, cur_cfg_comp,
                                        cur_cfg_comp_dest);
                        }
 
                        cur_cfg_comp = bt_config_component_from_arg(arg);
                        if (!cur_cfg_comp) {
-                               printf_err("Invalid source component format:\n    %s\n",
+                               printf_err("Invalid format for --source option's argument:\n    %s\n",
                                        arg);
                                goto error;
                        }
+                       cur_is_implicit_source = false;
 
                        assert(cur_base_params);
                        bt_put(cur_cfg_comp->params);
-                       cur_cfg_comp->params = bt_get(cur_base_params);
+                       cur_cfg_comp->params = bt_value_copy(cur_base_params);
+                       if (!cur_cfg_comp->params) {
+                               print_err_oom();
+                               goto end;
+                       }
+
                        cur_cfg_comp_dest = BT_CONFIG_COMPONENT_DEST_SOURCE;
-                       cur_cfg_comp_params_set = false;
                        break;
                }
                case OPT_OUTPUT_FORMAT:
@@ -2420,23 +2595,28 @@ struct bt_config *bt_config_from_args(int argc, char *argv[], int *exit_code)
                        }
 
                        /* Non-legacy: try to create a component config */
-                       if (cur_cfg_comp) {
+                       if (cur_cfg_comp && !cur_is_implicit_source) {
                                add_cfg_comp(cfg, cur_cfg_comp,
                                        cur_cfg_comp_dest);
                        }
 
                        cur_cfg_comp = bt_config_component_from_arg(arg);
                        if (!cur_cfg_comp) {
-                               printf_err("Invalid sink component format:\n    %s\n",
+                               printf_err("Invalid format for --sink option's argument:\n    %s\n",
                                        arg);
                                goto error;
                        }
+                       cur_is_implicit_source = false;
 
                        assert(cur_base_params);
                        bt_put(cur_cfg_comp->params);
-                       cur_cfg_comp->params = bt_get(cur_base_params);
+                       cur_cfg_comp->params = bt_value_copy(cur_base_params);
+                       if (!cur_cfg_comp->params) {
+                               print_err_oom();
+                               goto end;
+                       }
+
                        cur_cfg_comp_dest = BT_CONFIG_COMPONENT_DEST_SINK;
-                       cur_cfg_comp_params_set = false;
                        break;
                }
                case OPT_PARAMS:
@@ -2445,14 +2625,8 @@ struct bt_config *bt_config_from_args(int argc, char *argv[], int *exit_code)
                        struct bt_value *params_to_set;
 
                        if (!cur_cfg_comp) {
-                               printf_err("--params option must follow a --source or --sink option\n");
-                               goto error;
-                       }
-
-                       if (cur_cfg_comp_params_set) {
-                               printf_err("Duplicate --params option for the same current component (%s.%s)\n",
-                                       cur_cfg_comp->plugin_name->str,
-                                       cur_cfg_comp->component_name->str);
+                               printf_err("Can not apply parameter to unavailable default source component \"%s\".\n",
+                                       DEFAULT_SOURCE_COMPONENT_NAME);
                                goto error;
                        }
 
@@ -2463,19 +2637,33 @@ struct bt_config *bt_config_from_args(int argc, char *argv[], int *exit_code)
                                goto error;
                        }
 
-                       params_to_set = bt_value_map_extend(cur_base_params,
+                       params_to_set = bt_value_map_extend(cur_cfg_comp->params,
                                params);
                        BT_PUT(params);
                        if (!params_to_set) {
-                               printf_err("Cannot extend current base parameters with --params option's argument:\n    %s\n",
+                               printf_err("Cannot extend current component parameters with --params option's argument:\n    %s\n",
                                        arg);
                                goto error;
                        }
 
                        BT_MOVE(cur_cfg_comp->params, params_to_set);
-                       cur_cfg_comp_params_set = true;
                        break;
                }
+               case OPT_PATH:
+                       if (!cur_cfg_comp) {
+                               printf_err("Can not apply parameter to unavailable default source component \"%s\".\n",
+                                       DEFAULT_SOURCE_COMPONENT_NAME);
+                               goto error;
+                       }
+
+                       assert(cur_cfg_comp->params);
+
+                       if (bt_value_map_insert_string(cur_cfg_comp->params,
+                                       "path", arg)) {
+                               print_err_oom();
+                               goto error;
+                       }
+                       break;
                case OPT_BASE_PARAMS:
                {
                        struct bt_value *params = bt_value_from_arg(arg);
@@ -2579,6 +2767,67 @@ struct bt_config *bt_config_from_args(int argc, char *argv[], int *exit_code)
                case OPT_CLOCK_FORCE_CORRELATE:
                        cfg->force_correlate = true;
                        break;
+               case OPT_BEGIN:
+                       if (!cur_cfg_comp) {
+                               printf_err("Can not apply parameter to unavailable default source component \"%s\".\n",
+                                       DEFAULT_SOURCE_COMPONENT_NAME);
+                               goto error;
+                       }
+                       if (cur_cfg_comp_dest != BT_CONFIG_COMPONENT_DEST_SOURCE) {
+                               printf_err("--begin option must follow a --source option\n");
+                               goto error;
+                       }
+                       if (bt_value_map_insert_string(cur_cfg_comp->params,
+                                       "begin", arg)) {
+                               print_err_oom();
+                               goto error;
+                       }
+                       break;
+               case OPT_END:
+                       if (!cur_cfg_comp) {
+                               printf_err("Can not apply parameter to unavailable default source component \"%s\".\n",
+                                       DEFAULT_SOURCE_COMPONENT_NAME);
+                               goto error;
+                       }
+                       if (cur_cfg_comp_dest != BT_CONFIG_COMPONENT_DEST_SOURCE) {
+                               printf_err("--end option must follow a --source option\n");
+                               goto error;
+                       }
+                       if (bt_value_map_insert_string(cur_cfg_comp->params,
+                                       "end", arg)) {
+                               print_err_oom();
+                               goto error;
+                       }
+                       break;
+               case OPT_TIMERANGE:
+               {
+                       const char *begin, *end;
+
+                       if (!cur_cfg_comp) {
+                               printf_err("Can not apply parameter to unavailable default source component \"%s\".\n",
+                                       DEFAULT_SOURCE_COMPONENT_NAME);
+                               goto error;
+                       }
+                       if (cur_cfg_comp_dest != BT_CONFIG_COMPONENT_DEST_SOURCE) {
+                               printf_err("--timerange option must follow a --source option\n");
+                               goto error;
+                       }
+                       if (split_timerange(arg, &begin, &end)) {
+                               printf_err("Invalid --timerange format, expecting: begin,end or [begin,end] (where [] are actual brackets)\n");
+                               goto error;
+                       }
+                       if (bt_value_map_insert_string(cur_cfg_comp->params,
+                                       "begin", begin)) {
+                               print_err_oom();
+                               goto error;
+                       }
+                       if (bt_value_map_insert_string(cur_cfg_comp->params,
+                                       "end", end)) {
+                               print_err_oom();
+                               goto error;
+                       }
+                       break;
+               }
                case OPT_HELP:
                        BT_PUT(cfg);
                        print_usage(stdout);
@@ -2610,10 +2859,9 @@ struct bt_config *bt_config_from_args(int argc, char *argv[], int *exit_code)
                arg = NULL;
        }
 
-       /* Append current component configuration, if any */
-       if (cur_cfg_comp) {
-               add_cfg_comp(cfg, cur_cfg_comp, cur_cfg_comp_dest);
-               cur_cfg_comp = NULL;
+       if (argc - nr_omit_opt <= 1) {
+               print_usage(stdout);
+               goto put_cfg;
        }
 
        /* Check for option parsing error */
@@ -2638,6 +2886,16 @@ struct bt_config *bt_config_from_args(int argc, char *argv[], int *exit_code)
                }
        }
 
+       if (add_internal_plugin_paths(cfg)) {
+               goto error;
+       }
+
+       /* Append current component configuration, if any */
+       if (cur_cfg_comp && !cur_is_implicit_source) {
+               add_cfg_comp(cfg, cur_cfg_comp, cur_cfg_comp_dest);
+       }
+       cur_cfg_comp = NULL;
+
        /* Validate legacy/non-legacy options */
        if (!validate_cfg(cfg, &legacy_input_format, &legacy_output_format,
                        legacy_input_paths, &ctf_legacy_opts,
@@ -2654,9 +2912,27 @@ struct bt_config *bt_config_from_args(int argc, char *argv[], int *exit_code)
                if (append_sources_from_legacy_opts(cfg->sources,
                                legacy_input_format, &ctf_legacy_opts,
                                legacy_input_paths)) {
-                       printf_err("Cannot convert legacy input format options to source(s)\n");
+                       printf_err("Cannot convert legacy input format options to source component instance(s)\n");
+                       goto error;
+               }
+               if (append_sources_from_implicit_params(cfg->sources,
+                               implicit_source_comp)) {
+                       printf_err("Cannot initialize legacy component parameters\n");
                        goto error;
                }
+               use_implicit_source = false;
+       } else {
+               if (use_implicit_source) {
+                       add_cfg_comp(cfg, implicit_source_comp,
+                               BT_CONFIG_COMPONENT_DEST_SOURCE);
+                       implicit_source_comp = NULL;
+               } else {
+                       if (implicit_source_comp
+                                       && !bt_value_map_is_empty(implicit_source_comp->params)) {
+                               printf_err("Arguments specified for implicit source, but an explicit source has been specified, overriding it\n");
+                               goto error;
+                       }
+               }
        }
 
        /*
@@ -2666,18 +2942,30 @@ struct bt_config *bt_config_from_args(int argc, char *argv[], int *exit_code)
        if (legacy_output_format) {
                if (append_sinks_from_legacy_opts(cfg->sinks,
                                legacy_output_format, &text_legacy_opts)) {
-                       printf_err("Cannot convert legacy output format options to sink(s)\n");
+                       printf_err("Cannot convert legacy output format options to sink component instance(s)\n");
                        goto error;
                }
        }
 
+       if (cfg->sinks->len == 0) {
+               /* Use implicit sink as default. */
+               cur_cfg_comp = bt_config_component_from_arg(DEFAULT_SINK_COMPONENT_NAME);
+               if (!cur_cfg_comp) {
+                       printf_error("Cannot find implicit sink plugin \"%s\"\n",
+                               DEFAULT_SINK_COMPONENT_NAME);
+               }
+               add_cfg_comp(cfg, cur_cfg_comp,
+                       BT_CONFIG_COMPONENT_DEST_SINK);
+               cur_cfg_comp = NULL;
+       }
+
        goto end;
 
 error:
+       *exit_code = 1;
+put_cfg:
        BT_PUT(cfg);
        cfg = NULL;
-       *exit_code = 1;
-
 end:
        if (pc) {
                poptFreeContext(pc);
@@ -2696,6 +2984,7 @@ end:
        }
 
        free(arg);
+       BT_PUT(implicit_source_comp);
        BT_PUT(cur_cfg_comp);
        BT_PUT(cur_base_params);
        BT_PUT(text_legacy_opts.names);
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