Reviewed on: 2020-08-27
log_listener is a command line tool for retrieving log messages from
fuchsia.logger.Log and either writing them to disk or printing them.
This tool is included in the
core build product.
log_listener is typically invoked via the
fx log command:
$ fx log --help
It can also be run directly on a Fuchsia shell:
$ fx shell log_listener --help
Unit tests for
log_listener are available in the
$ fx test log_listener_tests
The implementation is located in
src/main.rs. Unit tests are co-located with the code.
An instance of
log_listener is always started to persist logs to disk, but by default is set to use 0 bytes of disk space. To change how much disk space
log_listener is allowed to use to persist logs, append this argument to your
fx set invocation:
This will cause logs to be placed in
/data/logs.all_logs. Once this file reaches half of the allowed maximum, it is renamed to
/data/logs.all_logs.old and future data is written to a newly-created