#!/bin/bash
# Jenkins initialization script to install Docker CLI

set -e

echo "Installing Docker CLI in Jenkins..."

# Update package list
apt-get update

# Install prerequisites
apt-get install -y \
    ca-certificates \
    curl \
    gnupg \
    lsb-release

# Add Docker's official GPG key
mkdir -p /etc/apt/keyrings
curl -fsSL https://download.docker.com/linux/debian/gpg | gpg --dearmor -o /etc/apt/keyrings/docker.gpg

# Set up repository
echo \
  "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/debian \
  $(lsb_release -cs) stable" | tee /etc/apt/sources.list.d/docker.list > /dev/null

# Install Docker CLI only (not daemon)
apt-get update
apt-get install -y docker-ce-cli

# Verify installation
docker --version

# Add jenkins user to docker group (if group exists on host)
usermod -aG docker jenkins || true

echo "✅ Docker CLI installed successfully!"