#!/bin/sh -e
HOSTNAME="$1"
[ -n "$HOSTNAME" ] || { echo "usage: $0 hostname"; exit 1; }
OVERLAY="${BEE_OVERLAY_DIR}"
[ -n "$OVERLAY" ] || { echo "ERROR: BEE_OVERLAY_DIR not set"; exit 1; }

cleanup() { rm -rf "$tmp"; }
tmp="$(mktemp -d)"
trap cleanup EXIT

makefile() { OWNER="$1" PERMS="$2" FILENAME="$3"; cat > "$FILENAME"; chown "$OWNER" "$FILENAME"; chmod "$PERMS" "$FILENAME"; }
rc_add() { mkdir -p "$tmp/etc/runlevels/$2"; ln -sf /etc/init.d/"$1" "$tmp/etc/runlevels/$2/$1"; }

mkdir -p "$tmp/etc"
makefile root:root 0644 "$tmp/etc/hostname" <<EOT
$HOSTNAME
EOT

mkdir -p "$tmp/etc/network"
makefile root:root 0644 "$tmp/etc/network/interfaces" <<EOT
auto lo
iface lo inet loopback
EOT

mkdir -p "$tmp/etc/apk"
makefile root:root 0644 "$tmp/etc/apk/world" <<EOT
alpine-base
dmidecode
smartmontools
nvme-cli
pciutils
ipmitool
util-linux
lsblk
e2fsprogs
lshw
openrc
ca-certificates
tzdata
jq
wget
EOT

rc_add devfs sysinit
rc_add dmesg sysinit
rc_add mdev sysinit
rc_add hwdrivers sysinit
rc_add modloop sysinit

rc_add hwclock boot
rc_add modules boot
rc_add sysctl boot
rc_add hostname boot
rc_add bootmisc boot
rc_add syslog boot

rc_add mount-ro shutdown
rc_add killprocs shutdown
rc_add savecache shutdown

rc_add bee-network default
rc_add bee-update default
rc_add bee-nvidia default
rc_add bee-audit default

if [ -d "$OVERLAY/etc" ]; then
    cp -r "$OVERLAY/etc/." "$tmp/etc/"
    chmod +x "$tmp/etc/init.d/"* 2>/dev/null || true
fi

mkdir -p "$tmp/usr"
if [ -d "$OVERLAY/usr" ]; then
    cp -r "$OVERLAY/usr/." "$tmp/usr/"
    chmod +x "$tmp/usr/local/bin/"* 2>/dev/null || true
fi

if [ -d "$OVERLAY/lib" ]; then
    mkdir -p "$tmp/lib"
    cp -r "$OVERLAY/lib/." "$tmp/lib/"
fi

tar -c -C "$tmp" etc usr lib 2>/dev/null | gzip -9n > "$HOSTNAME.apkovl.tar.gz"