Running a custom command before/after update #740
Description
Is your feature request related to a problem? Please describe
I run a multi-mcu setup and have some "timer too close" issues every now and then. One solution that seems to work is to set TRSYNC_TIMEOUT = 0.05 (instead of the default 0.025) in klipper/klippy/mcu.py. However, changing that file results in a git error when I try to update klipper through kiauh, and even if it didn't, a git pull would overwrite the file with the default value.
Describe the solution you'd like
What would be helpful is if there were a way to set commands to run before and after the update. For my use case, I would set the pre-update command
cd ~/klipper && git restore klippy/mcu.py
and then the post-update command
sed -i 's/TRSYNC_TIMEOUT = [0-9.]*$/TRSYNC_TIMEOUT = 0.05/' ~/klipper/klippy/mcu.py
but I expect there would be lots of other use cases for people who want to tweak their setup in a way that's not covered by config files.
Describe alternatives you've considered
Someone on github has kindly written a script to manage this specific variable and retain it through updates (https://github.com/IcePrints/klipper-trsync-timeout), but this isn't compatible with managing updates in kiauh.
Additional information
No response