deploy-watch git e docker compose

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	# Git Deploy Watch

	A simple Linux service that automatically deploys your Docker Compose application when new Git changes are detected.

	It checks the repository every 30 seconds and, when a new commit is found, runs:

	```bash
	docker compose up -d --build
	```

	The service runs in the background, starts automatically after reboot, and restarts if it crashes.

	## Install

	Run this inside your project directory:

	```bash
	cd /opt/my-project

	curl -fsSL "https://gist.githubusercontent.com/MarcosViniicius/d6e5d30bfe4703c3d4c7f543266f59e9/raw/deploy-watch.sh" \| sudo bash

	## Check status

	```bash
	systemctl status git-deploy-watch
	```

	## View logs

	```bash
	journalctl -u git-deploy-watch -f
	```

	## Uninstall

	```bash
	curl -fsSL "https://gist.githubusercontent.com/MarcosViniicius/d6e5d30bfe4703c3d4c7f543266f59e9/raw/deploy-watch.sh" \| sudo bash -s -- remove
	```

	### Requirements

	* Linux + systemd
	* Git
	* Docker + Docker Compose
	* A Git repository with `docker-compose.yml` or `compose.yml`

	#!/bin/bash

	set -e

	SERVICE_NAME="git-deploy-watch"
	SCRIPT_PATH="/usr/local/bin/$SERVICE_NAME"
	SERVICE_FILE="/etc/systemd/system/$SERVICE_NAME.service"

	# =========================
	# REMOVE
	# =========================

	if [ "$1" = "remove" ]; then
	echo "Removing $SERVICE_NAME..."

	systemctl disable --now "$SERVICE_NAME" 2>/dev/null \|\| true
	rm -f "$SERVICE_FILE"
	rm -f "$SCRIPT_PATH"

	systemctl daemon-reload
	systemctl reset-failed "$SERVICE_NAME" 2>/dev/null \|\| true

	echo "Monitor removed successfully."
	exit 0
	fi

	# =========================
	# INSTALL
	# =========================

	APP_DIR="$(pwd)"

	if [ ! -d "$APP_DIR/.git" ]; then
	echo "Error: the current directory is not a Git repository."
	exit 1
	fi

	if [ ! -f "$APP_DIR/docker-compose.yml" ] &&
	[ ! -f "$APP_DIR/compose.yml" ]; then
	echo "Error: no docker-compose.yml or compose.yml file found."
	exit 1
	fi

	echo "Installing monitor..."
	echo "Application directory: $APP_DIR"

	cat > "$SCRIPT_PATH" <<EOF
	#!/bin/bash

	APP_DIR="$APP_DIR"
	LOCK_FILE="/tmp/$SERVICE_NAME.lock"

	cd "\$APP_DIR" \|\| exit 1

	while true; do

	exec 9>"\$LOCK_FILE"

	if flock -n 9; then

	BEFORE=\$(git rev-parse HEAD 2>/dev/null \|\| echo "")

	git pull --quiet

	AFTER=\$(git rev-parse HEAD 2>/dev/null \|\| echo "")

	if [ -n "\$BEFORE" ] && [ "\$BEFORE" != "\$AFTER" ]; then

	echo "[\$(date '+%Y-%m-%d %H:%M:%S')] Changes detected."
	echo "[\$(date '+%Y-%m-%d %H:%M:%S')] Running Docker Compose..."

	docker compose up -d --build

	echo "[\$(date '+%Y-%m-%d %H:%M:%S')] Deployment completed."

	fi

	fi

	sleep 30

	done
	EOF

	chmod +x "$SCRIPT_PATH"

	cat > "$SERVICE_FILE" <<EOF
	[Unit]
	Description=Git Pull Docker Deploy Watcher
	After=network-online.target docker.service
	Wants=network-online.target
	Requires=docker.service

	[Service]
	Type=simple
	ExecStart=$SCRIPT_PATH
	WorkingDirectory=$APP_DIR
	Restart=always
	RestartSec=5

	[Install]
	WantedBy=multi-user.target
	EOF

	systemctl daemon-reload
	systemctl enable "$SERVICE_NAME"
	systemctl restart "$SERVICE_NAME"

	echo
	echo "========================================"
	echo " Monitor installed successfully"
	echo "========================================"
	echo
	echo "Application directory: $APP_DIR"
	echo "Service: $SERVICE_NAME"
	echo
	echo "Logs:"
	echo "journalctl -u $SERVICE_NAME -f"
	echo
	echo "Remove:"
	echo "curl -fsSL https://gist.githubusercontent.com/MarcosViniicius/d6e5d30bfe4703c3d4c7f543266f59e9/raw/deploy-watch.sh \| sudo bash -s -- remove"
	echo

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