Allow daemonized processes to rotate logs

[f8-ptrk]

Checklist

• This is not a new feature or an enhancement to the Filecoin protocol. If it is, please open an FIP issue.
• This is not brainstorming ideas. If you have an idea you'd like to discuss, please open a new discussion on the lotus forum and select the category as Ideas.
• I have a specific, actionable, and well motivated feature request to propose.

Lotus component

lotus JSON-RPC API

What is the motivation behind this feature request? Is your feature request related to a problem? Please describe.

log files get big fast especially when debug output is logged. to allow proper log "segmentation" and system hygiene a command to rotate the logfiles would be great!

Describe the solution you'd like

lotus daemon log rotate --file=new.log

same for lotus-miner/worker

Describe alternatives you've considered

none, the daemons keep the file handle open i assume so linux side logrotete solutions do not really work great

Additional context

have a client sending over 10mb of log files to debug a problem, spend time on finding the relevant parts of it - with daily/weekly/whatever log files life would be easier

[lanzafame]

@f8-ptrk logrotate works fine with lotus logs. Underneath everything lotus uses Uber's zap logger which is designed to work with external log rotation tools.

[f8-ptrk]

i see that as working then. thanks @lanzafame

[lanzafame]

For anyone who comes across this at a later date, you will want to use the copytruncate option in your logrotate configuration for lotus/lotus-miner log files as this keeps the same file pointer and that way lotus/lotus-miner do not need to be restarted.