Fresh Ubuntu install script

install-with-fresh-ubuntu.sh

#!/bin/bash
# Fresh Ubuntu / WSL2 setup script
#
# Installs essential build tools, configures Git credential forwarding
# from Windows, sets up Docker, and wires up an SSH agent that persists
# across shell sessions.
#
# Usage:
#   chmod +x install-with-fresh-ubuntu.sh && ./install-with-fresh-ubuntu.sh

set -euo pipefail

sudo apt-get update && sudo apt-get upgrade
sudo apt-get -y install build-essential curl

# Git credential manager — forward credentials from the Windows-side GCM.
# Requires Git for Windows with Git Credential Manager installed on the host.
git config --global credential.helper "/mnt/c/Program\ Files/Git/mingw64/bin/git-credential-manager.exe"

# Setup Docker. These directions work on WSL2.
sudo addgroup --system docker
sudo adduser $USER docker
newgrp docker
sudo chown root:docker /var/run/docker.sock
sudo chmod g+w /var/run/docker.sock

# Append SSH agent auto-start to ~/.bash_profile.
# Reuses an existing agent if one is already running; starts a new one otherwise.
cat >> ~/.bash_profile << 'EOF'

# SSH agent — start once per login, reuse across shells
if [ -z "${SSH_AUTH_SOCK:-}" ]; then
    if ! pgrep -u "$USER" ssh-agent > /dev/null; then
        ssh-agent -s > ~/.ssh/ssh-agent-env
    fi
    [ -f ~/.ssh/ssh-agent-env ] && eval "$(cat ~/.ssh/ssh-agent-env)" > /dev/null
fi
EOF