#!/bin/sh
# agent-bootstrap.sh
#
# Run INSIDE a guest (via noVNC console login, or any root shell) to bring the
# system fully under agent management in one shot:
#   1. install + enable qemu-guest-agent  (so Proxmox can reach the guest)
#   2. push the agent SSH key to root + localuser
#   3. grant localuser passwordless sudo
#
# After this runs once, the agent has SSH+sudo immediately. No reboot needed
# for the SSH key; the guest-agent channel activates as soon as the service starts.
#
# Usage (from a root shell in the guest):
#   bash agent-bootstrap.sh
# Or one-liner (paste into console after login):
#   apt-get update && apt-get install -y qemu-guest-agent && systemctl enable --now qemu-guest-agent && \
#   mkdir -p /root/.ssh /home/localuser/.ssh && chmod 700 /root/.ssh /home/localuser/.ssh && \
#   KEY='ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIIWms/uCXnjjo4KyxHBcYI2TDHe8OZ2wle6W/0hSRQLu reachableceo@ultix-streaming' && \
#   for u in root localuser; do AK=$(getent passwd "$u"|cut -d: -f6)/.ssh/authorized_keys; touch "$AK"; chmod 600 "$AK"; grep -qF "$KEY" "$AK" || echo "$KEY" >> "$AK"; chown "$u": "$AK"; done && \
#   id localuser >/dev/null 2>&1 && { echo 'localuser ALL=(ALL) NOPASSWD:ALL' > /etc/sudoers.d/010-agent; chmod 440 /etc/sudoers.d/010-agent; }; \
#   echo BOOTSTRAP-DONE

set -eu

KEY='ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIIWms/uCXnjjo4KyxHBcYI2TDHe8OZ2wle6W/0hSRQLu reachableceo@ultix-streaming'

# 1. guest-agent
if ! command -v qemu-ga >/dev/null 2>&1; then
  if command -v apt-get >/dev/null 2>&1; then
    apt-get update
    DEBIAN_FRONTEND=noninteractive apt-get install -y qemu-guest-agent
  elif command -v dnf >/dev/null 2>&1; then
    dnf install -y qemu-guest-agent
  elif command -v yum >/dev/null 2>&1; then
    yum install -y qemu-guest-agent
  else
    echo "WARN: no supported package manager; skipping agent install" >&2
  fi
fi
systemctl enable --now qemu-guest-agent 2>/dev/null || \
  systemctl enable --now qemu-ga 2>/dev/null || true

# 2. SSH key for root + all unprivileged agents (localuser, labuser)
for u in root localuser labuser; do
  if ! getent passwd "$u" >/dev/null 2>&1; then continue; fi
  H=$(getent passwd "$u" | cut -d: -f6)
  mkdir -p "$H/.ssh"; chmod 700 "$H/.ssh"
  AK="$H/.ssh/authorized_keys"; touch "$AK"; chmod 600 "$AK"
  grep -qF "$KEY" "$AK" || echo "$KEY" >> "$AK"
  chown -R "$u": "$H/.ssh"
done

# 3. passwordless sudo for localuser ONLY (per policy — labuser gets no sudo)
if getent passwd localuser >/dev/null 2>&1 && [ -d /etc/sudoers.d ]; then
  echo 'localuser ALL=(ALL) NOPASSWD:ALL' > /etc/sudoers.d/010-agent
  chmod 440 /etc/sudoers.d/010-agent
fi

echo BOOTSTRAP-DONE