58 lines
2.2 KiB
Bash
Executable File
58 lines
2.2 KiB
Bash
Executable File
#/bin/bash
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# battery-suspend.sh
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# This program suspends the computer when the battery gets too low.
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# Copyright (c) 2024, Scott C. MacCallum (scott@scm-guru.live).
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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# To do. Add code to verify that the user is root, or has run the script with
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# sudo. Add code to verify that the bc program is installed.
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# Change this variable to the group that should be informed of a need to
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# charge the battery. On GNU/Linux distributions users are often part of
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# a group that is the same as their login name, which works well if you only
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# want your user to be informed.
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group=""
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# Change this variable to your batteries identification e.g. BAT0
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battery=""
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charge=$(cat /sys/class/power_supply/$battery/charge_now)
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discharge=$(cat /sys/class/power_supply/$battery/current_now)
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hours=$(echo "scale=2; $charge / $discharge" | bc)
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minutes=$(echo "scale=2; $hours * 60" | bc)
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# Change the minimum variable to the minimum amount of minutes that a battery
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# has left before the group is informed to recharge it e.g. 40.00. When I
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# tested this and the battery-monitor.sh script, I was surprised to discover
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# that the computer turned off despite having reported that there was 10
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# minutes left! I created the battery-status.sh script to aid in my
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# understanding of what was going on, and I discovered a variance of about 10
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# minutes plus/minus each time that I ran it. Keep the minus 10 minutes in
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# mind when setting the minimum value.
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# YOU'VE BEEN WARNED!
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minimum=
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if (( $(echo "$minutes < $minimum" | bc -l) )); then
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echo "Suspending the computer! Battery charge is needed!" | wall -g $group
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sleep 3
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systemctl suspend
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fi
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exit 0
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