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BABELTRACE2-CONVERT(1) Babeltrace 2 manual BABELTRACE2-CONVERT(1)

babeltrace2-convert - Convert one or more traces to a given format

Pretty-print (plain text) the events, in order, of one or more traces:

babeltrace2 [GENERAL OPTIONS] [convert] [--retry-duration=TIME-US]
            TRACE-PATH...

Convert one or more traces to a given format:

babeltrace2 [GENERAL OPTIONS] [convert] [--retry-duration=TIME-US]
            CONVERSION ARGS

Get the equivalent babeltrace2-run(1) command arguments to convert one or more traces to a given format:

babeltrace2 [GENERAL OPTIONS] [convert] [--retry-duration=TIME-US]
            (--run-args | --run-args-0) CONVERSION ARGS

Print the metadata text of a CTF trace:

babeltrace2 [GENERAL OPTIONS] [convert] [--output=OUTPATH]
            --output-format=ctf-metadata TRACE-PATH

Print the available remote LTTng tracing sessions (see <https://lttng.org/docs/#doc-lttng-live>):

babeltrace2 [GENERAL OPTIONS] [convert] [--output=OUTPATH]
            --input-format=lttng-live URL

The convert command converts one or more traces to a given format, possibly with filters in the conversion path.

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


Note

convert is the default babeltrace2(1) command: you generally don’t need to specify its name. The following commands are equivalent if the ... part does not start with another babeltrace2(1) command’s name, like run or list-plugins:

$ babeltrace2 convert ...
$ babeltrace2 ...

If you need to make sure that you are executing the convert command, use babeltrace2 convert explicitly.

More specifically, the convert command creates a conversion graph.

A conversion graph is a specialized trace processing graph focused on the conversion of one or more traces to another format, possibly filtering or modifying their events and other messages in the process. A conversion graph is a linear chain of components once the source streams are merged:

+----------+
| source 1 @-.
+----------+ |
             |  +-------+
+----------+ '->@       |    +---------+    +------------+
| source 2 @--->@ muxer @--->@ trimmer @--->@ debug-info @-.
+----------+ .->@       |    +---------+    +------------+ |
             |  +-------+                                  |
+----------+ |    .----------------------------------------'
|   ...    @-'    |  +---------------+    +------+
+----------+      '->@ other filters |--->@ sink |
                     +---------------+    +------+

Note that the trimmer, debugging information, and other filters are optional. See “Create implicit components from options” to learn how to enable them.

If you need another trace processing graph layout, use the more flexible babeltrace2-run(1) command.

Like with the babeltrace2-run(1) command, you can create components explicitly with the --component option (see “Create explicit components”). You can also use one of the many specific convert command options (see “Create implicit components from options”) and non-option arguments (see “Create implicit components from non-option arguments”) to create implicit components.

An implicit component is a component which is created and added to the conversion graph without an explicit instantiation through the --component option. An implicit component is easier to create than an explicit component: this is why the convert command exists, as you can also create and run a conversion graph with the generic babeltrace2-run(1) command.

For example, you can specify one or more CTF trace path as non-option arguments to pretty-print the merged events to the standard output:

$ babeltrace2 /path/to/trace /path/to/other/trace

This is the equivalent of creating and connecting together:

•One source.ctf.fs components with its inputs initialization parameter set to /path/to/trace.

•One source.ctf.fs components with its inputs initialization parameter set to /path/to/other/trace.

•A filter.utils.muxer component.

•A sink.text.pretty component.

This creates the following conversion graph:

+------------+    +-----------------+    +------------------+
| src.ctf.fs |    | flt.utils.muxer |    | sink.text.pretty |
|  [ctf-fs]  |    |     [muxer]     |    |     [pretty]     |
|            |    |                 |    |                  |
|    stream0 @--->@ in0         out @--->@ in               |
|    stream1 @--->@ in1             |    +------------------+
|    stream2 @--->@ in2             |
|    stream3 @--->@ in3             |
+------------+    |                 |
                  |                 |
+------------+    |                 |
| src.ctf.fs |    |                 |
| [ctf-fs-2] |    |                 |
|            |    |                 |
|    stream0 @--->@ in4             |
|    stream1 @--->@ in5             |
+------------+    @ in6             |
                  +-----------------+

It is equivalent to the following babeltrace2-run(1) command line:

$ babeltrace2 run --component=ctf-fs:src.ctf.fs \
                  --params='inputs=["/path/to/trace"] \
                  --component=ctf-fs-2:src.ctf.fs \
                  --params='inputs=["/path/to/other/trace"] \
                  --component=muxer:filter.utils.muxer \
                  --component=pretty:sink.text.pretty \
                  --connect=ctf*:muxer --connect=muxer:pretty

You can use the --run-args option to make the convert command print its equivalent run command arguments instead of creating and running the conversion graph. The printed arguments are escaped for shells, which means you can use them as is on the command line and possibly add more options to the run command:

$ babeltrace2 run $(babeltrace2 --run-args /path/to/trace) ...

The --run-args-0 option is like the --run-args option, but the printed arguments are NOT escaped and they are separated by a null character instead of a space. This is useful if the resulting arguments are not the direct input of a shell, for example if passed to xargs -0.

See “EXAMPLES” for usage examples.

To explicitly create a component, use the --component option. This option specifies:

Optional: The name of the component.

•The type of the component class to instantiate: source, filter, or sink.

•The name of the plugin in which to find the component class to instantiate.

•The name of the component class to instantiate.

You can use the --component option multiple times to create multiple components. You can instantiate the same component class multiple times as different component instances.

Immediately following a --component option on the command line, the created component is known as the current component (until the next --component option or non-option argument).

The following command-line options apply to the current component:

--log-level=LVL

Set the log level of the current component to LVL.

--params=PARAMS

Add PARAMS to the initialization parameters of the current component.

If PARAMS contains a key which exists in the current component’s initialization parameters, replace the parameter.

See “EXAMPLES” for usage examples.

When you specify a non-option argument to the convert command, it tries to find one or more components which can handle this argument.

For example, with this command line:

$ babeltrace2 /path/to/trace

If /path/to/trace is a CTF trace directory, then the convert command creates a source.ctf.fs component to handle this specific trace.

This automatic source component discovery mechanism is possible thanks to component classes which support the babeltrace.support-info query object (see babeltrace2-query-babeltrace.support-info(7)).

The non-option argument can be a directory. If no component can handle that specific directory, then the convert command traverses that directory and recursively tries to find compatible components for each file and subdirectory. This means that a single non-option argument can lead to the creation of many implicit components.

The following command-line options apply to ALL the implicit components created from the last non-option argument:

--log-level=LVL

Set the log level of those implicit components to LVL.

--params=PARAMS

Add PARAMS to the initialization parameters of those implicit components.

For a given implicit component, if PARAMS contains a key which exists in this component’s initialization parameters, replace the parameter.

Note that it’s also possible for two non-option arguments to cause the creation of a single implicit component. For example, if you specify:

$ babeltrace2 /path/to/chunk1 /path/to/chunk2

where /path/to/chunk1 and /path/to/chunk2 are paths to chunks of the same logical CTF trace, then the convert command creates a single source.ctf.fs component which receives both paths at initialization time. When this happens, any --log-level or --params option that you specify to one of them applies to the single implicit component. For example:

$ babeltrace2 /path/to/chunk1 --params=clock-class-offset-s=450 \
              /path/to/chunk2 --params=clock-class-offset-ns=98 \
              --log-level=INFO

Here, the single implicit component gets both clock-class-offset-s and clock-class-offset-ns initialization parameters, as well as the INFO log level.

For backward compatibility with the babeltrace(1) program, the convert command ignores any non-option argument which does not cause the creation of any component. In that case, it emits a warning log statement and continues.

There are many ways to create implicit components from options with the convert command:

•To create an implicit filter.utils.trimmer component (stream trimmer), specify the --begin, --end, or --timerange option.

Examples:

$ babeltrace2 /path/to/trace --begin=22:14:38 --end=22:15:07

$ babeltrace2 /path/to/trace --timerange=22:14:38,22:15:07

$ babeltrace2 /path/to/trace --end=12:31:04.882928015

•To create an implicit filter.lttng-utils.debug-info (add debugging information to compatible LTTng events), specify any of the --debug-info, --debug-info-dir, --debug-info-full-path, or --debug-info-target-prefix options.

Examples:

$ babeltrace2 /path/to/trace --debug-info

$ babeltrace2 /path/to/trace \
              --debug-info-target-prefix=/tmp/tgt-root

$ babeltrace2 /path/to/trace --debug-info-full-path

•To create an implicit sink.text.pretty component (pretty-printing text output to the standard output or to a file), specify no other sink components, explicit or implicit.

The implicit sink.text.pretty component exists by default. If any other explicit or implicit sink component exists, the convert command does not automatically create the implicit sink.text.pretty component.

The --clock-cycles, --clock-date, --clock-gmt, --clock-seconds, --color, --fields, --names, and --no-delta options all apply to the implicit sink.text.pretty component.

The --output option without --output-format=ctf makes the implicit sink.text.pretty component write its content to a file, except the warnings for backward compatibility with the babeltrace(1) program.

Examples:

$ babeltrace2 /path/to/trace

$ babeltrace2 /path/to/trace --no-delta

$ babeltrace2 /path/to/trace --output=/tmp/pretty-out

•To create an implicit sink.utils.dummy component (no output), specify the --output-format=dummy option.

Example:

$ babeltrace2 /path/to/trace --output-format=dummy

•To create an implicit sink.ctf.fs component (CTF traces written to the file system), specify the --output-format=ctf and the --output=DIR (base output directory) options.

Example:

$ babeltrace2 /path/to/input/trace --output-format=ctf \
              --output=my-traces

You can combine multiple methods to create multiple implicit components. For example, you can trim an LTTng (CTF) trace, add debugging information to it, and write it as another CTF trace:

$ babeltrace2 /path/to/input/trace --timerange=22:14:38,22:15:07 \
              --debug-info --output-format=ctf --output=out-dir

The equivalent babeltrace2-run(1) command of this convert command is:

$ babeltrace2 run --component=auto-disc-source-ctf-fs:source.ctf.fs \
                  --params='inputs=["/path/to/input/trace"]' \
                  --component=sink-ctf-fs:sink.ctf.fs \
                  --params='path="out-dir"' \
                  --component=muxer:filter.utils.muxer \
                  --component=trimmer:filter.utils.trimmer \
                  --params='begin="22:14:38"' \
                  --params='end="22:15:07"' \
                  --component=debug-info:filter.lttng-utils.debug-info \
                  --connect=auto-disc-source-ctf-fs:muxer \
                  --connect=muxer:trimmer \
                  --connect=trimmer:debug-info \
                  --connect=debug-info:sink-ctf-fs

The order of the implicit component options documented in this subsection is not significant.

See “EXAMPLES” for more examples.

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.

See “Create explicit components” to learn how to use the following option.

-c [NAME:]COMP-CLS-TYPE.PLUGIN-NAME.COMP-CLS-NAME, --component=[NAME:]COMP-CLS-TYPE.PLUGIN-NAME.COMP-CLS-NAME

Create a component named NAME (if specified) from the component class of type COMP-CLS-TYPE named COMP-CLS-NAME found in the plugin named PLUGIN-NAME, and set it as the current component.

The available values for COMP-CLS-TYPE are:

source, src

Source component class.

filter, flt

Filter component class.

sink

Sink component class.

See “Create explicit components” and “Create implicit components from non-option arguments” to learn how to use the following options.

The following options apply to either the current explicit component (last --component option) or to ALL the implicit components created from the last non-option argument.

-l LVL, --log-level=LVL

Set the log level of the current component(s) to LVL.

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.

-p PARAMS, --params=PARAMS

Add PARAMS to the initialization parameters of the current component(s).

If PARAMS contains a key which exists in the initialization parameters of the current component(s), replace the parameter.

The format of PARAMS is a comma-separated list of NAME=VALUE assignments:

NAME=VALUE[,NAME=VALUE]...

NAME

Parameter name (C identifier plus the :, ., and - characters).

VALUE

One of:

null, nul, NULL: null value.

true, TRUE, yes, YES: true boolean value.

false, FALSE, no, NO: false boolean value.

•Binary (0b prefix), octal (0 prefix), decimal, or hexadecimal (0x prefix) unsigned (with + prefix) or signed 64-bit integer.

•Double precision floating point number (scientific notation is accepted).

•Unquoted string with no special characters, and not matching any of the null and boolean value symbols above.

•Double-quoted string (accepts escape characters).

•Array, formatted as an opening [, a comma-separated list of VALUE, and a closing ].

•Map, formatted as an opening {, a comma-separated list of NAME=VALUE assignments, and a closing }.

You may put whitespaces around the individual = (assignment), , (separator), [ (array beginning), ] (array end), { (map beginning), and } (map end) characters.

Example:

--params='many=null, fresh=yes, condition=false, squirrel=-782329,
          play=+23, observe=3.14, simple=beef,
          needs-quotes="some string",
          escape.chars-are:allowed="a \" quote",
          things=[1, "hello", 2.71828],
          frog={slow=2, bath=[bike, 23], blind=NO}'


Important
Like in the example above, make sure to single-quote the whole argument when you run this command from a shell, as it can contain many special characters.

-i FORMAT, --input-format=FORMAT
Force the convert command to create components from a specific component class for non-option arguments (see “Create implicit components from non-option arguments”), or list available remote LTTng tracing sessions.

The available values for FORMAT are:

ctf

Use the source.ctf.fs component class.

Each non-option argument of the command line is a CTF trace or CTF trace chunk.

See babeltrace2-source.ctf.fs(7) to learn more about this component class.

lttng-live

Depending on the format of the first non-option argument:

net[4]://RDHOST[:RDPORT]

List the available remote LTTng tracing sessions for the LTTng relay daemon at the address RDHOST and port RDPORT (5344 if not specified), and then exit.

net[4]://RDHOST[:RDPORT]/host/TGTHOST/SESSION

Use the source.ctf.lttng-live component class.

See babeltrace2-source.ctf.lttng-live(7) to learn more about this component class and the URL format.

You can specify at most one --input-format option.

-o FORMAT, --output-format=FORMAT

Create an implicit sink component with format FORMAT or print the metadata text of a CTF trace.

The available values for FORMAT are:

text

Create an implicit sink.text.pretty component.

See “Implicit sink.text.pretty component”.

See babeltrace2-sink.text.pretty(7) to learn more about this component class.

ctf

Create an implicit sink.ctf.fs component. Specify the base output path with the --output option.

See babeltrace2-sink.ctf.fs(7) to learn more about this component class.

dummy

Create an implicit sink.utils.dummy component.

See babeltrace2-sink.utils.dummy(7) to learn more about this component class.

ctf-metadata

Print the metadata text of a CTF trace and exit.

The first non-option argument specifies the path to the CTF trace.

You can specify at most one --output-format option.

See babeltrace2-source.ctf.fs(7) to learn more about this component class.

--clock-force-correlate

Set the force-clock-class-origin-unix-epoch initialization parameter of all the implicit source.ctf.fs components to true.

The force-clock-class-origin-unix-epoch initialization parameter makes all the created clock classes have a Unix epoch origin. This is useful to force the clock classes of multiple traces to be compatible even if they are not inherently.

--clock-offset=SEC

Set the clock-class-offset-s initialization parameter of all the implicit source.ctf.fs components to SEC.

The clock-class-offset-s initialization parameter adds SEC seconds to the offsets of all the clock classes that the component creates.

You can combine this option with --clock-offset-ns.

--clock-offset-ns=NS

Set the clock-class-offset-ns initialization parameter of all the implicit source.ctf.fs components to NS.

The clock-class-offset-ns initialization parameter adds NS nanoseconds to the offsets of all the clock classes that the component creates.

You can combine this option with --clock-offset-s.

If you specify at least one of the following options, you create an implicit filter.utils.trimmer component.

See babeltrace2-filter.utils.trimmer(7) to learn more about this component class.

--begin=TIME

Set the begin initialization parameter of the component to TIME.

You cannot use this option with the --timerange option.

The format of TIME is one of:

YYYY-MM-DD HH:II[:SS[.NANO]]
HH:II[:SS[.NANO]]
[-]SEC[.NANO]

YYYY

4-digit year.

MM

2-digit month (January is 01).

DD

2-digit day.

HH

2-digit hour (24-hour format).

II

2-digit minute.

SS

2-digit second.

NANO

Nanoseconds (up to nine digits).

SEC

Seconds since origin.

--end=TIME

Set the end initialization parameter of the component to TIME.

You cannot use this option with the --timerange option.

See the --begin option for the format of TIME.

--timerange=BEGIN,END

Equivalent to --begin=BEGIN and --end=END.

You can also surround the whole argument with [ and ].

If you specify at least one of the following options, you create an implicit filter.lttng-utils.debug-info component. This component only alters compatible LTTng events.

See babeltrace2-filter.lttng-utils.debug-info(7) to learn more about this component class.

--debug-info

Create an implicit filter.lttng-utils.debug-info component.

This option is useless if you specify any of the options below.

--debug-info-dir=DIR

Set the debug-info-dir initialization parameter of the component to DIR.

The debug-info-dir parameter indicates where the component should find the debugging information it needs if it’s not found in the actual executable files.

--debug-info-full-path

Set the full-path initialization parameter of the component to true.

When the full-path parameter is true, the component writes the full (absolute) paths to files in its debugging information fields instead of just the short names.

--debug-info-target-prefix=PREFIX

Set the target-prefix initialization parameter of the component to PREFIX.

The target-prefix parameter is a path to prepend to the paths to executables recorded in the trace. For example, if a trace contains the executable path /usr/bin/ls in its state dump events, and you specify --debug-info-target-prefix=/home/user/boards/xyz/root, then the component opens the /home/user/boards/xyz/root/usr/bin/ls file to find debugging information.

If you specify at least one of the following options, you force the convert command’s sink component to be an implicit sink.text.pretty component.

See babeltrace2-sink.text.pretty(7) to learn more about this component class.

--clock-cycles

Set the clock-seconds initialization parameter of the component to true.

The clock-cycles parameter makes the component print the event time in clock cycles.

--clock-date

Set the clock-date initialization parameter of the component to true.

The clock-date parameter makes the component print the date and the time of events.

--clock-gmt

Set the clock-gmt initialization parameter of the component to true.

The clock-gmt parameter makes the component not apply the local timezone to the printed times.

--clock-seconds

Set the clock-seconds initialization parameter of the component to true.

The clock-seconds parameter makes the component print the event times in seconds since the Unix epoch.

--color=WHEN

Set the color initialization parameter of the component to WHEN.

The available values for WHEN 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.

The auto and always values have no effect if the BABELTRACE_TERM_COLOR environment variable is set to NEVER.

--fields=FIELD[,FIELD]...

For each FIELD, set the field-FIELD initialization parameter of the component to true.

For example, --fields=trace,loglevel,emf sets the field-trace, field-loglevel, and field-emf initialization parameters to true.

The available value for FIELD are:

trace

trace:hostname

trace:domain

trace:procname

trace:vpid

loglevel

emf

callsite

--names=NAME[,NAME]...

For each NAME, set the name-NAME initialization parameter of the component to true.

For example, --names=payload,scope sets the name-payload and name-scope initialization parameters to true.

The available value for NAME are:

payload

context

scope

header

--no-delta

Set the no-delta initialization parameter of the component to true.

When the no-delta parameter is true, the component does not print the duration since the last event on the line.

-w PATH, --output=PATH
With --output-format=ctf-metadata or --input-format=lttng-live (when printing the available remote LTTng tracing sessions), write the text to the file PATH instead of the standard output.

When you specify --output-format=ctf, set the path initialization parameter of the implicit sink.ctf.fs component to PATH.

Without any specified sink component, explicit or implicit, force the convert command’s sink component to be an implicit sink.text.pretty component and set its path initialization parameter to PATH.

See babeltrace2-sink.ctf.fs(7) and babeltrace2-sink.text.pretty(7) to learn more about those component classes.

--run-args
Print the equivalent babeltrace2-run(1) arguments instead of creating and running the conversion graph.

The printed arguments are space-separated and individually escaped for safe shell input.

You cannot use this option with the --run-args-0 or --stream-intersection option.

--run-args-0

Print the equivalent babeltrace2-run(1) arguments instead of creating and running the conversion graph.

The printed arguments are separated with a null character and NOT escaped for safe shell input.

You cannot use this option with the --run-args or --stream-intersection option.

--retry-duration=TIME-US
Set the duration of a single retry to TIME-US µs when a sink component reports "try again later" (busy network or file system, for example).

Default: 100000 (100 ms).

--stream-intersection

Enable the stream intersection mode.

In this mode, for each trace, the convert command filters out the events and other messages which are not in the time range where all the trace’s streams are active.

To use this option, all the source components, explicit and implicit, must have classes which support the babeltrace.trace-infos query object (see babeltrace2-query-babeltrace.trace-infos(7)). The only Babeltrace 2 project’s component class which supports this query object is source.ctf.fs.

You cannot use this option with the --run-args or --run-args-0 option.

The following options exist for backward compatibility with the babeltrace(1) program.

-d, --debug

Legacy option: this is equivalent to --log-level=TRACE, where --log-level is the general option (not this command’s --log-level option).

-v, --verbose

Legacy option: this is equivalent to --log-level=INFO, where --log-level is the general option (not this command’s --log-level option).

This option also sets the verbose parameter of the implicit sink.text.pretty component (see babeltrace2-sink.text.pretty(7)) to true.

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

Example 1. Pretty-print the events, in order, of one or more CTF traces.

$ babeltrace2 my-ctf-traces

$ babeltrace2 my-ctf-traces

$ babeltrace2 my-ctf-trace-1 my-ctf-trace-2 my-ctf-trace-3

Example 2. Trim a CTF trace and pretty-print the events.

$ babeltrace2 my-ctf-trace --begin=22:55:43.658582931 \
                           --end=22:55:46.967687564

$ babeltrace2 my-trace --begin=22:55:43.658582931

$ babeltrace2 my-trace --end=22:55:46.967687564

$ babeltrace2 my-trace --timerange=22:55:43,22:55:46.967687564

Example 3. Trim a CTF trace, enable the stream intersection mode, and write a CTF trace.

$ babeltrace2 my-ctf-trace --stream-intersection \
              --timerange=22:55:43,22:55:46.967687564 \
              --output-format=ctf --output=out-ctf-trace

Example 4. Print the available remote LTTng sessions (through LTTng live).

$ babeltrace2 --input-format=lttng-live net://localhost

Example 5. Pretty-print LTTng live events.

$ babeltrace2 net://localhost/host/myhostname/my-session-name

Example 6. Record LTTng live traces to the file system (as CTF traces).

$ babeltrace2 net://localhost/host/myhostname/my-session-name \
              --params=session-not-found-action=end \
              --output-format=ctf --output=out-ctf-traces

Example 7. Read a CTF trace as fast as possible using a dummy output.

$ babeltrace2 my-trace --output-format=dummy

Example 8. Read three CTF traces in stream intersection mode, add debugging information, and pretty-print them to a file.

$ babeltrace2 ctf-trace1 ctf-trace2 ctf-trace3 --stream-intersection \
              --debug-info --output=pretty-out

Example 9. Pretty-print a CTF trace and traces from an explicit source component, with the event times showed in seconds since the Unix epoch.

$ babeltrace2 ctf-trace --component=src.my-plugin.my-src \
              --params='path="spec-trace",output-some-event-type=yes' \
              --clock-seconds

Example 10. Send LTTng live events to an explicit sink component.

$ babeltrace2 net://localhost/host/myhostname/mysession \
              --component=sink.my-plugin.my-sink

Example 11. Trim a CTF trace, add debugging information, apply an explicit filter component, and write as a CTF trace.

$ babeltrace2 /path/to/ctf/trace --timerange=22:14:38,22:15:07 \
              --debug-info --component=filter.my-plugin.my-filter \
              --params=criteria=xyz,ignore-abc=yes \
              --output-format=ctf --output=out-ctf-trace

Example 12. Print the metadata text of a CTF trace.

$ babeltrace2 /path/to/ctf/trace --output-format=ctf-metadata

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_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.

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.

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

/usr/lib/babeltrace2/plugins

System plugin directory.

/usr/lib/babeltrace2/plugin-providers

System plugin provider directory.

0 on success, 1 otherwise.

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

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>)

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>.

This command is part of the Babeltrace 2 project.

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

babeltrace2-intro(7), babeltrace2(1), babeltrace2-run(1)
14 September 2019 Babeltrace 2.0.3