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Signed-off-by: Michael Hanselmann <hansmi@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>
Reviewed-by: René Nussbaumer <rn@google.com>

This function can be used from a SIGHUP handler to reopen log files.
Initial, simple unittests are included.
Signed-off-by: Michael Hanselmann <hansmi@google.com>
Reviewed-by: René Nussbaumer <rn@google.com>

It's passed in by most users (daemons, CLI scripts) and for the others
(burnin, watcher) it certainly doesn't hurt, especially when using
syslog.
Signed-off-by: Michael Hanselmann <hansmi@google.com>
Reviewed-by: René Nussbaumer <rn@google.com>

The I/O error will occur while opening the file, not while adding
and configuring the handler.
Signed-off-by: Michael Hanselmann <hansmi@google.com>
Reviewed-by: René Nussbaumer <rn@google.com>

Signed-off-by: Michael Hanselmann <hansmi@google.com>
Reviewed-by: René Nussbaumer <rn@google.com>

This patch adds a new log handler class based on the standard library's
BaseRotatingHandler. This new class allows the log file to be re-opened,
e.g. upon receiving a SIGHUP signal. The latter will be implemented in
forthcoming patches. The patch does not change the behaviour regarding
writing to /dev/console.

Quite a bit of code had to be changed to unittest the log handlers.
Signed-off-by: Michael Hanselmann <hansmi@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>

Signed-off-by: Michael Hanselmann <hansmi@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>