flux-tree: redirect stdio streams

[jameshcorbett]

trafficstars

It would be nice to be able to redirect the stdio streams of each flux tree leaf instance to different files. I was thinking maybe providing some kind of format string on the command line that gets formatted when each leaf instance is created? Since flux tree already uses Python-style "{}".format() formatting, maybe something like flux tree -T2x2 --stdout my_logs_{tree_id}.log --stderr my_errs_{tree_id}.log which would yield files my_logs_tree.1.1.log and so on.

[dongahn]

This is great idea @jameshcorbett! I thought about this but didn't know what would be a great way to achieve this. But your suggestion makes a lot of sense.

I won't be able to get this right away though because of other priorities. I will add "help wanted" label for now. If we don't get help we circle back to this after our milestones.