#!/usr/bin/env bash
# Provision the jailkit chroot used by the control-panel browser terminal so the
# customer shell is confined to its own home (cannot see /var/www, other tenants,
# /etc, or secrets). Idempotent; run as root on each hosting node.
set -Eeuo pipefail

JAIL=/home/jail

echo "==> Installing jailkit"
export DEBIAN_FRONTEND=noninteractive
command -v jk_init >/dev/null 2>&1 || apt-get install -y jailkit

echo "==> Building jail tree at $JAIL"
jk_init -j "$JAIL" uidbasics netbasics basicshell interactiveshell extendedshell editors netutils terminfo || true
jk_cp -j "$JAIL" /usr/bin/id /usr/bin/whoami /usr/bin/find /usr/bin/grep /usr/bin/less \
  /usr/bin/head /usr/bin/tail /usr/bin/du /usr/bin/df /usr/bin/wc /usr/bin/clear /usr/bin/sed /usr/bin/awk || true

# Terminal definitions (xterm*) for a usable TTY.
mkdir -p "$JAIL/usr/share/terminfo"
cp -rn /usr/share/terminfo/x "$JAIL/usr/share/terminfo/" 2>/dev/null || true

# Non-listable jail /home (each session bind-mounts only its own home here).
install -d -o root -g root -m 711 "$JAIL/home"
install -d -m 1777 "$JAIL/tmp"

echo "==> Syncing hosting users into the jail passwd/group (for name resolution)"
while IFS=: read -r name _ uid gid _ home shell; do
  [ "$uid" -ge 1000 ] 2>/dev/null || continue
  [ -d "/home/$name" ] || continue
  grep -q "^$name:" "$JAIL/etc/passwd" || getent passwd "$name" >> "$JAIL/etc/passwd"
  grep -q "^$name:" "$JAIL/etc/group" || getent group "$name" >> "$JAIL/etc/group"
done < <(getent passwd)

echo "==> Installing the jailed-shell launcher + scoped sudoers"
install -o root -g root -m 755 "$(dirname "$0")/ladill-jailsh" /usr/local/sbin/ladill-jailsh
echo 'www-data ALL=(root) NOPASSWD: /usr/local/sbin/ladill-jailsh *' > /etc/sudoers.d/ladill-jailsh
chmod 440 /etc/sudoers.d/ladill-jailsh
visudo -cf /etc/sudoers.d/ladill-jailsh

echo "==> Done. Customer terminals now run jailed in $JAIL."