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Re: zsh portable script

On Tue, 13 Jul 2010, Benjamin R. Haskell wrote:

But, I don't recall ever needing root to read the battery status. (In the /proc/acpi subsystem that you're using, /proc/acpi/battery/BAT{0,1}/{info,state} are chmod 0444 on my laptop and netbook; same for the /sys/class/ stuff I used above.) And on my FreeBSD webhost where I have pretty resticted access, I seem to be able to grab a lot of hardware-related info via sysctl.

from what i've seen, linux permissions to anything in /proc depend on the distro, but the same *info* is available to anyone with local access on a bsd box via sysctl.

i'm more familiar with freebsd than linux. are you saying that /sys/class/power_supply/BAT0/charge_* will be readable when /proc/acpi/battery/BAT0/* isn't? if that's the case, i'll update the script.

Are permissions the reason you suggest running it under cron? Otherwise, why not just regenerate in precmd()?

on my bsd laptop i always have at least one mrxvt with ten shells open. it seems to make sense to just have root get the info once per minute and let the shells read it from a file, than have a bunch of shells all invoking sysctl and all figuring out about the battery.

i suppose it can be done without privileges, and it shouldn't burden the machine; then i suppose it might make sense to get rid of the battery script and put the logic into precmd. i suppose the worst case is a hundred or so shells all working it out for themselves... that shouldn't cause any problems... except if the machine is bogged down and it takes that much longer to wait for a prompt that's hung while something it needs to generate a battery notice is blocked (although that risk is probably there already with the load monitor). i might be able to add a short timeout, in which case it will just skip it... something to think about, i guess.


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