Same as it was in most previous releases. Without this, you may not see
any output for certain errors.
Signed-off-by: Thomas Mühlbacher <tmuehlbacher@posteo.net>
This mostly tries to be similar to the default `env_logger` format but
instead of using the more vague target in the log message, we instead
put the file name and line number in the log.
Signed-off-by: Thomas Mühlbacher <tmuehlbacher@posteo.net>
Instead of the custom logger impl, which limits the features we can
easily provide for users.
This introduces the `BCACHEFS_LOG` environment variable for setting the
log verbosity. Setting `BCACHEFS_LOG=trace`, e.g. in a test environment,
will yield all log messages.
Also I think it's reasonable to print INFO level logs by default.
Signed-off-by: Thomas Mühlbacher <tmuehlbacher@posteo.net>
