initial commit

README.md

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+# Power Watch
+
+Telegram notifier for your laptop homelabs.
+
+Sends a Telegram message when your system switches between AC and battery, perfect for power sensitive deployments.
+
+## Install (Configure before installation)
+```bash
+git clone https://github.com/YOURNAME/power-watch.git
+cd power-watch
+./install.sh
+```
+
+## Configuration
+- Edit `./power-watch.sh`, and set `BOT_TOKEN` & `CHAT_ID`

install.sh

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+#!/bin/bash
+set -e
+
+echo "Installing power-watch..."
+
+mkdir -p ~/.local/bin
+mkdir -p ~/.config/systemd/user
+
+cp power-watch.sh ~/.local/bin/power-watch.sh
+chmod +x ~/.local/bin/power-watch.sh
+
+cp systemd/power-watch.service ~/.config/systemd/user/
+cp systemd/power-watch.timer ~/.config/systemd/user/
+
+systemctl --user daemon-reload
+systemctl --user enable --now power-watch.timer
+
+echo "Enabling lingering..."
+sudo loginctl enable-linger "$USER"
+
+echo "Done! Power Watch is running."
+echo "Test with: systemctl --user start power-watch.service"
+

power-watch.sh

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+#!/bin/bash
+
+BOT_TOKEN="<BOT_TOKEN>"
+CHAT_ID="<CHAT_ID>"
+
+STATE_FILE="/tmp/power_state"
+
+POWER=$(upower -i $(upower -e | grep BAT) | grep "state:" | awk '{print $2}')
+
+
+# First run
+if [ ! -f "$STATE_FILE" ]; then
+    echo "$POWER" > "$STATE_FILE"
+    exit 0
+fi
+
+LAST=$(cat "$STATE_FILE")
+
+# If power state changed
+if [ "$POWER" != "$LAST" ]; then
+    echo "$POWER" > "$STATE_FILE"
+
+    if [ "$POWER" = "discharging" ]; then
+        MSG="⚠️ Homelab running on BATTERY!
+Switching off heavy services recommended."
+    else
+        MSG="🔌 Power restored — running on AC"
+    fi
+
+    curl -s -X POST "https://api.telegram.org/bot$BOT_TOKEN/sendMessage" \
+        -d chat_id="$CHAT_ID" \
+        -d text="$MSG" > /dev/null
+fi

systemd/power-watch.service

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+[Unit]
+Description=Power Watch Telegram Notifier
+
+[Service]
+Type=oneshot
+ExecStart=%h/.local/bin/power-watch.sh
+Environment=PATH=/usr/bin:/bin

systemd/power-watch.timer

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+[Unit]
+Description=Run Power Watch every minute
+
+[Timer]
+OnBootSec=30
+OnUnitActiveSec=60
+AccuracySec=5s
+
+[Install]
+WantedBy=timers.target

uninstall.sh

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+#!/bin/bash
+set -e
+
+echo "Removing power-watch..."
+
+systemctl --user disable --now power-watch.timer || true
+
+rm -f ~/.config/systemd/user/power-watch.service
+rm -f ~/.config/systemd/user/power-watch.timer
+rm -f ~/.local/bin/power-watch.sh
+
+systemctl --user daemon-reload
+
+echo "Removed."