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#!/bin/bash
# Auto-update script for Docker Compose projects
# This script checks for new commits and updates Docker Compose when changes are detected
# Configuration - can be overridden by environment variables with sensible defaults
REPO_DIR="${REPO_DIR:-/home/ubuntu/proxy}"
LOG_FILE="${LOG_FILE:-/home/ubuntu/proxy/update.log}"
LOCK_FILE="${LOCK_FILE:-/tmp/proxy_update.lock}"
MAX_LOG_LINES="${MAX_LOG_LINES:-10000}" # Maximum number of log lines to keep
# Detect which Docker Compose command is available
detect_docker_compose_cmd() {
if command -v docker >/dev/null 2>&1 && docker compose version >/dev/null 2>&1; then
echo "docker compose"
elif command -v docker-compose >/dev/null 2>&1; then
echo "docker-compose"
else
log_message "ERROR: Neither 'docker compose' nor 'docker-compose' is available"
exit 1
fi
}
# Set the Docker Compose command
DOCKER_COMPOSE_CMD=$(detect_docker_compose_cmd)
# Function to log messages with timestamp
log_message() {
echo "$(date '+%Y-%m-%d %H:%M:%S') - $1" >> "$LOG_FILE"
}
# Function to prune log file to keep only recent entries
prune_logs() {
if [ -f "$LOG_FILE" ]; then
local line_count=$(wc -l < "$LOG_FILE" 2>/dev/null || echo 0)
if [ "$line_count" -gt "$MAX_LOG_LINES" ]; then
# Create a temporary file with only the last MAX_LOG_LINES lines
tail -n "$MAX_LOG_LINES" "$LOG_FILE" > "${LOG_FILE}.tmp"
mv "${LOG_FILE}.tmp" "$LOG_FILE"
log_message "Log file pruned. Kept last $MAX_LOG_LINES lines."
fi
fi
}
# Function to cleanup on exit
cleanup() {
rm -f "$LOCK_FILE"
}
# Set trap to cleanup on exit
trap cleanup EXIT
# Check if another instance is running
if [ -f "$LOCK_FILE" ]; then
log_message "Another update process is already running. Exiting."
exit 1
fi
# Create lock file
touch "$LOCK_FILE"
# Change to repository directory
cd "$REPO_DIR" || {
log_message "ERROR: Cannot change to repository directory $REPO_DIR"
exit 1
}
# Fetch latest changes from remote
log_message "Fetching latest changes from remote..."
git fetch origin 2>/dev/null
# Check if local branch is behind remote
LOCAL_HASH=$(git rev-parse HEAD)
REMOTE_HASH=$(git rev-parse origin/$(git branch --show-current))
if [ "$LOCAL_HASH" != "$REMOTE_HASH" ]; then
log_message "New commits detected. Current: $LOCAL_HASH, Remote: $REMOTE_HASH"
# Pull latest changes
log_message "Pulling latest changes..."
if git pull origin $(git branch --show-current) 2>&1 | tee -a "$LOG_FILE"; then
log_message "Successfully pulled latest changes"
# Stop current containers
log_message "Stopping current containers..."
sudo $DOCKER_COMPOSE_CMD down 2>&1 | tee -a "$LOG_FILE"
# Build and start updated containers
log_message "Building and starting updated containers..."
if sudo $DOCKER_COMPOSE_CMD up -d --build 2>&1 | tee -a "$LOG_FILE"; then
log_message "Successfully updated and restarted containers"
else
log_message "ERROR: Failed to start containers"
exit 1
fi
else
log_message "ERROR: Failed to pull changes"
exit 1
fi
else
log_message "No new commits found. Repository is up to date."
fi
log_message "Update check completed successfully"
# Prune logs after each run to prevent unlimited growth
prune_logs