Sunil Mohan Adapa 80a203bd23
config: Add option to set logging mode: none/volatile/persistent
- None disables logging altogether. This is useful when we want to prevent
FreedomBox from collecting IP addresses of visitors and other sensitive
information.

- Volatile logs are kept in RAM until the system is rebooted. Only 5% of RAM
will be used at most and only 2 days worth of logs are kept.

- Permanent will store logs into /var/log/journal. systemd-journald defaults
will apply. 10% of disk capacity is used at most, capped at 4GiB. Also logging
will stop if free space is below 15%. Maximum of 100 files are kept. No time
based cleanup is done.

Tests:

- Set the logging mode to disabled. Observe that `journalctl -f` does not show
any logs (say when performing plinth actions).

- Set the logging mode to volatile. Observe that `journalctl` shows that logging
is set to /run/log/journal/ and 5% of available memory is set as maximum.

- Set the logging mode to persistent. Observe that `journalctl` shows that
logging is set to /var/log/journal/ and 10% of disk space is set as maximum.

Signed-off-by: Sunil Mohan Adapa <sunil@medhas.org>
Reviewed-by: James Valleroy <jvalleroy@mailbox.org>
2022-07-17 16:54:46 -04:00
..