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| -rw-r--r-- | README.md | 18 | ||||
| -rwxr-xr-x | bin/batman | 55 | ||||
| -rw-r--r-- | cron.d/batman | 1 |
3 files changed, 74 insertions, 0 deletions
diff --git a/README.md b/README.md new file mode 100644 index 0000000..a7585fb --- /dev/null +++ b/README.md @@ -0,0 +1,18 @@ +## I'm Batman! + +It's a simple shell script that can do two things: +1. Report the current battery charge and whether the battery is charging or not. +2. Shutdown the machine if the charge is below 5%, the battery is discharging, + and the user is privileged to do so. + +Currently I'm including this in a cron file. This repository should soon host a +systemd timer file as well. + +To-Dos: +[ ] systemd timer file +[ ] use [/var]/run instead of /tmp for the "are we rebooting"-file + +## Why? + +Because I can :) There are other mechanisms out there, but I started this +script in unintended ignorance of these and now I finished it ;) diff --git a/bin/batman b/bin/batman new file mode 100755 index 0000000..5b873d7 --- /dev/null +++ b/bin/batman @@ -0,0 +1,55 @@ +#!/bin/sh + +declare -x VOERBOOS +RETVAL=0;export RETVAL +BATVAL="$(echo "scale=0;$(cat /sys/class/power_supply/BAT0/charge_now)*100/$(cat /sys/class/power_supply/BAT0/charge_full)"|bc -l)";export BATVAL +BATSTATE="`cat /sys/class/power_supply/BAT0/status`";export BATSTATE +BATFILE="/tmp/batman.sd";export BATFILE +export OPTCNT=0 +function batmobile { + if [ "$BATVAL" -le 5 ];then + case "$BATSTATE" in + "Charging") + MSG="Battery charged at $BATVAL% with status \"$BATSTATE\", no shutdown." + [ ! -z "$VOERBOOS" ]&&[ "$VOERBOOS" -eq 1 ]&&echo "$MSG"||true + logger -p"info" -t"batman" "Battery charged at $BATVAL% with status \"$BATSTATE\", no shutdown."||RETVAL=$(("$RETVAL"+$?)) + [ -e "$BATFILE" ]&&/usr/sbin/shutdown -c >/dev/null 2>&1&&rm "$BATFILE" + SDCRV="$?" + case "$SDCRV" in + 0) logger -p"info" -t"batman" "Shutdown cancelled.";; + *) + logger -p"warn" -t"batman" "$BATFILE exists but couldn't cancel shutdown!" + RETVAL=$(("$RETVAL"+"$SDCRV")) + ;; + esac + ;; + *) + MSG="Battery charged at $BATVAL%, powering down." + [ ! -z "$VOERBOOS" ]&&[ "$VOERBOOS" -eq 1 ]&&echo "$MSG"||true + logger -pwarn -t"batman" "$MSG"||RETVAL=$(("$RETVAL"+$?)) + if [ ! -e "$BATFILE" ];then + /usr/sbin/shutdown -P +2 "Battery low and discharging, powering down. (batman)"&&touch "$BATFILE"||RETVAL=$(("$RETVAL"+$?)) + fi + ;; + esac + else + MSG="Battery charged at $BATVAL%, no shutdown." + [ ! -z "$VOERBOOS" ]&&[ "$VOERBOOS" -eq 1 ]&&echo "$MSG"||logger -p"info" -t"batman" "$MSG"||RETVAL=$(("$RETVAL"+$?)) + fi +} +function batarang { + MSG="$BATVAL% ($BATSTATE)";echo "$MSG"; +} + +while getopts :vnp SHOPT;do + case "$SHOPT" in + v)VOERBOOS=1;export VOERBOOS;((OPTCNT++));; + p)batmobile;((OPTCNT++));; + ""|n)batarang;((OPTCNT++));; + *)echo "Not supported option: -""${OPTARG}" >&2;RETVAL=$(($RETVAL+1)) >&2;WRONGOPT=1;((OPTCNT++));; + esac +done +shift $(( $OPTIND - 1 )) +[ "$OPTCNT" -le 0 ]&&batarang +[ ! -z "$WRONGOPT" ]&&[ "$WRONGOPT" -eq 1 ]&&exit 1||true +exit "$RETVAL" diff --git a/cron.d/batman b/cron.d/batman new file mode 100644 index 0000000..d0af5a7 --- /dev/null +++ b/cron.d/batman @@ -0,0 +1 @@ +* * * * * root /usr/local/bin/batman -p |