NAME

       babeltrace2-help - Get help for a Babeltrace 2 plugin or component class

SYNOPSIS

       Get help for a Babeltrace 2 plugin:

       babeltrace2 [GENERAL OPTIONS] help PLUGIN-NAME

       Get help for a Babeltrace 2 component class:

       babeltrace2 [GENERAL OPTIONS] help
                   COMP-CLS-TYPE.PLUGIN-NAME.COMP-CLS-NAME

DESCRIPTION

       The help command prints the details and help text of either the Babeltrace 2 plugin named
       PLUGIN-NAME or the specific component class of type COMP-CLS-TYPE named COMP-CLS-NAME
       found in the plugin named PLUGIN-NAME.

       See babeltrace2-intro(7) to learn more about the Babeltrace 2 project and its core
       concepts.

       The available values for COMP-CLS-TYPE are:

       source, src
           Source component class.

       filter, flt
           Filter component class.

       sink
           Sink component class.

       See “EXAMPLES” for usage examples.

OPTIONS

   General
       You can use those options before the command name.

       See babeltrace2(1) for more details.

       -d, --debug
           Legacy option: this is equivalent to --log-level=TRACE.

       -l LVL, --log-level=LVL
           Set the log level of all known Babeltrace 2 loggers to LVL.

       --omit-home-plugin-path
           Do not search for plugins in $HOME/.local/lib/babeltrace2/plugins.

       --omit-system-plugin-path
           Do not search for plugins in /usr/lib/babeltrace2/plugins.

       --plugin-path=PATH[:PATH]...
           Add PATH to the list of paths in which plugins can be found.

       -v, --verbose
           Legacy option: this is equivalent to --log-level=INFO.

   Command information
       -h, --help
           Show the command’s help and quit.

EXAMPLES

       Example 1. Get help for a plugin and all its component classes.

           $ babeltrace2 help ctf

       Example 2. Get help for a specific plugin’s source component class.

           $ babeltrace2 help source.ctf.fs

       Example 3. Get help for a specific plugin’s sink component class.

           $ babeltrace2 help sink.text.pretty

ENVIRONMENT VARIABLES

   Babeltrace 2 library
       BABELTRACE_EXEC_ON_ABORT=CMDLINE
           Execute the command line CMDLINE, as parsed like a UNIX 98 shell, when any part of the
           Babeltrace 2 project unexpectedly aborts.

           The application only aborts when the executed command returns, ignoring its exit
           status.

           This environment variable is ignored when the application has the setuid or the setgid
           access right flag set.

       BABELTRACE_TERM_COLOR=(AUTO | NEVER | ALWAYS)
           Force the terminal color support for the babeltrace2(1) program and the project’s
           plugins.

           The available values are:

           AUTO
               Only emit terminal color codes when the standard output and error streams are
               connected to a color-capable terminal.

           NEVER
               Never emit terminal color codes.

           ALWAYS
               Always emit terminal color codes.

       BABELTRACE_TERM_COLOR_BRIGHT_MEANS_BOLD=0
           Set to 0 to emit SGR (see <https://en.wikipedia.org/wiki/ANSI_escape_code>) codes 90
           to 97 for bright colors instead of bold (SGR code 1) and standard color codes (SGR
           codes 30 to 37).

       BABELTRACE_PLUGIN_PATH=PATHS
           Set the list of directories, in order, in which dynamic plugins can be found before
           other directories are considered to PATHS (colon-separated, or semicolon on Windows).

       LIBBABELTRACE2_DISABLE_PYTHON_PLUGINS=1
           Disable the loading of any Babeltrace 2 Python plugin.

       LIBBABELTRACE2_INIT_LOG_LEVEL=LVL
           Force the Babeltrace 2 library’s initial log level to be LVL.

           If this environment variable is set, it overrides the log level set by the --log-level
           option for the Babeltrace 2 library logger.

           The available values for LVL are:

           NONE, N
               Logging is disabled.

           FATAL, F
               Severe errors that lead the execution to abort immediately.

               This level should be enabled in production.

           ERROR, E
               Errors that might still allow the execution to continue.

               Usually, once one or more errors are reported at this level, the application,
               plugin, or library won’t perform any more useful task, but it should still exit
               cleanly.

               This level should be enabled in production.

           WARN, WARNING, W
               Unexpected situations which still allow the execution to continue.

               This level should be enabled in production.

           INFO, I
               Informational messages that highlight progress or important states of the
               application, plugins, or library.

               This level can be enabled in production.

           DEBUG, D
               Debugging information, with a higher level of details than the TRACE level.

               This level should NOT be enabled in production.

           TRACE, T
               Low-level debugging context information.

               This level should NOT be enabled in production.

       LIBBABELTRACE2_NO_DLCLOSE=1
           Make the Babeltrace 2 library leave any dynamically loaded modules (plugins and plugin
           providers) open at exit. This can be useful for debugging purposes.

       LIBBABELTRACE2_PLUGIN_PROVIDER_DIR=DIR
           Set the directory from which the Babeltrace 2 library dynamically loads plugin
           provider shared objects to DIR.

           If this environment variable is set, it overrides the default plugin provider
           directory.

   Babeltrace 2 Python bindings
       BABELTRACE_PYTHON_BT2_LOG_LEVEL=LVL
           Force the Babeltrace 2 Python bindings log level to be LVL.

           If this environment variable is set, it overrides the log level set by the --log-level
           option for the Python bindings logger.

           The available values for LVL are:

           NONE, N
               Logging is disabled.

           FATAL, F
               Severe errors that lead the execution to abort immediately.

               This level should be enabled in production.

           ERROR, E
               Errors that might still allow the execution to continue.

               Usually, once one or more errors are reported at this level, the application,
               plugin, or library won’t perform any more useful task, but it should still exit
               cleanly.

               This level should be enabled in production.

           WARN, WARNING, W
               Unexpected situations which still allow the execution to continue.

               This level should be enabled in production.

           INFO, I
               Informational messages that highlight progress or important states of the
               application, plugins, or library.

               This level can be enabled in production.

           DEBUG, D
               Debugging information, with a higher level of details than the TRACE level.

               This level should NOT be enabled in production.

           TRACE, T
               Low-level debugging context information.

               This level should NOT be enabled in production.

   CLI
       BABELTRACE_CLI_LOG_LEVEL=LVL
           Force babeltrace2 CLI’s log level to be LVL.

           If this environment variable is set, it overrides the log level set by the --log-level
           option for the CLI logger.

           The available values for LVL are:

           NONE, N
               Logging is disabled.

           FATAL, F
               Severe errors that lead the execution to abort immediately.

               This level should be enabled in production.

           ERROR, E
               Errors that might still allow the execution to continue.

               Usually, once one or more errors are reported at this level, the application,
               plugin, or library won’t perform any more useful task, but it should still exit
               cleanly.

               This level should be enabled in production.

           WARN, WARNING, W
               Unexpected situations which still allow the execution to continue.

               This level should be enabled in production.

           INFO, I
               Informational messages that highlight progress or important states of the
               application, plugins, or library.

               This level can be enabled in production.

           DEBUG, D
               Debugging information, with a higher level of details than the TRACE level.

               This level should NOT be enabled in production.

           TRACE, T
               Low-level debugging context information.

               This level should NOT be enabled in production.

       BABELTRACE_CLI_WARN_COMMAND_NAME_DIRECTORY_CLASH=0
           Disable the warning message which babeltrace2-convert(1) prints when you convert a
           trace with a relative path that’s also the name of a babeltrace2 command.

       BABELTRACE_DEBUG=1
           Legacy variable: equivalent to setting the --log-level option to TRACE.

       BABELTRACE_VERBOSE=1
           Legacy variable: equivalent to setting the --log-level option to INFO.

FILES

       $HOME/.local/lib/babeltrace2/plugins
           User plugin directory.

       /usr/lib/babeltrace2/plugins
           System plugin directory.

       /usr/lib/babeltrace2/plugin-providers
           System plugin provider directory.

EXIT STATUS

       0 on success, 1 otherwise.

BUGS

       If you encounter any issue or usability problem, please report it on the Babeltrace bug
       tracker (see <https://bugs.lttng.org/projects/babeltrace>).

RESOURCES

       The Babeltrace project shares some communication channels with the LTTng project (see
       <https://lttng.org/>).

       •   Babeltrace website (see <https://babeltrace.org/>)

       •   Mailing list (see <https://lists.lttng.org>) for support and development: lttng-
           dev@lists.lttng.org

       •   IRC channel (see <irc://irc.oftc.net/lttng>): #lttng on irc.oftc.net

       •   Bug tracker (see <https://bugs.lttng.org/projects/babeltrace>)

       •   Git repository (see <https://git.efficios.com/?p=babeltrace.git>)

       •   GitHub project (see <https://github.com/efficios/babeltrace>)

       •   Continuous integration (see <https://ci.lttng.org/view/Babeltrace/>)

       •   Code review (see <https://review.lttng.org/q/project:babeltrace>)

AUTHORS

       The Babeltrace 2 project is the result of hard work by many regular developers and
       occasional contributors.

       The current project maintainer is Jérémie Galarneau
       <mailto:jeremie.galarneau@efficios.com>.

COPYRIGHT

       This command is part of the Babeltrace 2 project.

       Babeltrace is distributed under the MIT license (see
       <https://opensource.org/licenses/MIT>).

SEE ALSO

       babeltrace2-intro(7), babeltrace2(1), babeltrace2-list-plugins(1)